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221. 题目: Lignocellulosic biowaste hydrothermal humification: Is there a method for predicting humic acid?
文章编号: N24122213
期刊: Chemical Engineering Journal
作者: Yuchao Shao, Jianchao Wang, Zhiqiang Dong, Yujie Wang, Wenjing He, Weizhong Huo, Rong Ye, Yanqing Liu, Kexue Liu, Jialin Xue, Wenjing Lu, Tianxue Yang
更新时间: 2024-12-22
摘要: Biomass-derived hydrochar exhibits significant potential for producing hydrothermal humic acid (HHA) in an alkaline hydrothermal environment. However, the quantitative relationship between the chemical characteristics of hydrochar and HHA yield remains unclear, and a method for assessing the hydrothermal humification potential of lignocellulosic biowaste under complex conditions is lacking. This study addressed this knowledge gap by identifying three scenarios based on the key indicator “the unsaturation degree of lignocellulosic biowaste’s and hydrochar’s average molecular formula (defined as Ω₁ and Ω₂, respectively)”: (1) insufficient hydrothermal carbonization (Ω₂ − Ω₁ < 1), (2) sufficient hydrothermal carbonization (Ω₂ − Ω₁ ≥ 1 and Ω₂ ≤ 4), and (3) excessive hydrothermal carbonization (Ω₂ ≥ 4). Using these scenarios, the study compiled data from literature and established a database (approximately 500 data sets) on the hydrothermal humification of lignocellulosic biowaste via hydrochar. Subsequently, the study applied a machine learning approach—Particle Swarm Optimization and Least Squares Support Vector Machine (PSO-LS-SVM)—to predict HHA yield based on different raw materials and complex hydrothermal conditions. The MAE, MSE, RMSE, and R² values from 50 random PSO-LS-SVM models demonstrated high accuracy and stability in predictions, with the highest R² values reaching 0.96 (scenario 1) and 0.97 (scenario 2). This approach can significantly reduce costs and effort for users conducting biowaste hydrothermal humification experiments.

222. 题目: Environmental Drivers of Dissolved Organic Matter Composition Across Central European Aquatic Systems: A novel correlation-based machine learning and FT-ICR MS approach.
文章编号: N24122212
期刊: Water Research
作者: Michel Gad, Narjes Tayyebi Sabet Khomami, Ronald Krieg, Jana Schor, Allan Philippe, Oliver J Lechtenfeld
更新时间: 2024-12-22
摘要: Dissolved organic matter (DOM) present in surface aquatic systems is a heterogeneous mixture of organic compounds reflecting its allochthonous and autochthonous organic matter (OM) sources. The composition of DOM is determined by environmental factors like land use, water chemistry, and climate, which influence its release, movement, and turnover in the ecosystem. However, studying the impact of these environmental factors on DOM composition is challenging due to the dynamic nature of the system and the complex interactions of multiple environmental factors involved. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) enables detailed molecular-level analysis of DOM, allowing the identification of thousands of individual molecular formulas potentially representing unique markers for its “molecular history”. The combination of FT-ICR MS with machine-learning techniques is promising to unravel DOM-environment interactions owing to their capacity to capture complex non-linear relationships. We present a novel unsupervised multi-variant machine-learning approach, aiming to model correlation coefficients as robust indicators of how changes in environmental factors (e.g., the concentration of nutrients or the land use) result in changes in the molecular formula descriptors of DOM (i.e., aromaticity index or hydrogen to carbon ratio). We applied this approach to an environmental data set collected from 84 sites across central Europe exhibiting a broad range of water chemistry and land uses. Our model revealed an increase in molecular mass and aromaticity of DOM in densely forested regions as compared to open urban areas, where DOM was characterized by higher concentrations of dissolved ions and increased microbial degradation, leading to smaller and more aliphatic DOM. Our findings highlight the substantial human impact on climate change, as evidenced by the accelerated photochemical and microbial degradation of DOM, which consequently enhances greenhouse gas emissions and exacerbates global warming.

223. 题目: Energy production and denitrogenation performance by sludge biochar based constructed wetlands-microbial fuel cells system: Overcoming carbon constraints in water
文章编号: N24122211
期刊: Water Research
作者: Boda Ouyang, Zhiyong Zhang, Fuzhi Chen, Fei Li, Ming-Lai Fu, Huachun Lan, Baoling Yuan
更新时间: 2024-12-22
摘要: As freshwater demand grows globally, using reclaimed water in natural water bodies has become essential. Constructed wetlands (CWs) are widely used for advanced wastewater treatment due to their environmental benefits. However, low carbon/nitrogen (C/N) ratios in wastewater limit nitrogen removal, often leading to eutrophication. This study explores the use of sewage sludge biochar (SB) and activated carbon (AC) as electrodes in microbial fuel cell-constructed wetlands (MFC-CW) to enhance nitrogen removal and energy generation. Results indicated that the sludge biochar closed-circuit CW (MSBS-CW) achieved considerable total nitrogen removal (95.85%) and maximum power density (9.05 mW/m²). Furthermore, high-throughput sequencing and functional gene analysis revealed substantial shifts in the microbial community within MSBS-CW, particularly in the electroactive bacteria (Geobacter), autotrophic denitrifying bacterium (Hydrogenophaga, Thiobacillus) and anaerobic ammonium oxidation bacteria (Candidatus_Brocadia). Electrochemical and material characterization showed that SB enhanced the cathode's electrochemical performance and the anode's biocompatibility, thereby improving denitrification and energy generation. This study demonstrates that sludge biochar is an effective low-cost electrode material for MFC-CW systems, offering a sustainable solution for nitrogen removal and energy production under carbon-constrained conditions.

224. 题目: Functionalization of MXenes [Ti3C2(=O/OH/F)X] with highly mesoporous NH2-activated biochar for permselective salty ions removal by capacitive deionization
文章编号: N24122210
期刊: Chemical Engineering Journal
作者: Joemer Absalon Adorna, Van Dien Dang, Thanh van Nguyen, Bishal Kumar Nahak, Keng-Ku Liu, Ruey-An Doong
更新时间: 2024-12-22
摘要: Capacitive deionization (CDI) is a cutting-edge solution for efficient saltwater desalination. In this study, the gas-hydrolyzed nanoflake MXenes (OMX) was hydrothermally synthesized and then coupled with amine-charged activated biochar (cAB) to form the asymmetric CDI for enhanced salty ion removal. The ratio of negatively charged –OH/=O/-F terminal group of Ti₃C₂T_X MXenes was optimized for better ion intercalation. Concurrently, the positively-charged cAB was used as an anode to eliminate the need for expensive ion-exchange membranes. The cAB structure creates a multi-porous network ideally for ion accommodation, which can retain 80 % of its original surface area after amination. Moreover, the interlayer spacing of OMX can expand from 9.3 to 13.4 Å after hydrolyzation at 120 °C. Electrochemical tests of OMX exhibits a specific capacitance of 185.0 F g⁻¹ at 5 mV/s, while the strong interaction between amine functional groups and Na₂SO₄ electrolyte enhances the capacitance of cAB up to 255 F g⁻¹ at 5 mV/s and retains 75 % of the original value at 100 mV/s. The asymmetric cAB||OMX hybrid CDI can minimize the co-ion repulsion, resulting in the enhancement of CDI efficiency. The specific electrosorption capacity of cAB||OMX can achieve 49.3 mg g⁻¹ at 5000 mg L⁻¹ NaCl and at 1.2 V. The Ragone plot of SEC and SAR in cAB||OMX highlights the minimal requirement of IEM on gas-hydrolyzed MXene hybrid CDI system, which can open the avenue to enhance the desalination performance for diverse water-energy nexus applications

225. 题目: Nutrient loading accelerates breakdown of refractory dissolved organic carbon in seagrass ecosystem waters
文章编号: N24122209
期刊: Water Research
作者: Xia Zhang, Songlin Liu, Yunchao Wu, Hongxue Luo, Yuzheng Ren, Jiening Liang, Xiaoping Huang, Peter I Macreadie
更新时间: 2024-12-22
摘要: Nutrient loading is a major driver of seagrass ecosystem decline and also threatens the capacity for seagrass ecosystems to act as ‘blue carbon’ sinks. Dissolved organic carbon (DOC) represents a crucial component of carbon storage in seagrass ecosystems, with refractory DOC (RDOC) playing a key role in long-term (millennial time scale) carbon stocks. The processes governing RDOC are heavily influenced by microbial activity. While it is known that nutrient loading can weaken DOC sequestration potential by changing the DOC composition and transformation, the impact of nutrients on microbial communities that regulate the RDOC pool in seagrass ecosystems remains poorly understood. To address this gap, we conducted a 300-d laboratory incubation experiment to examine the effects of nutrient enrichment on DOC processing and microbial community dynamics. As expected, nutrient addition significantly accelerated the decline in DOC concentration, resulting in the residual DOC exhibiting a higher degree of humification and more depleted δ¹³C constituents. Concurrent with DOC degradation, microbial community composition shifted from a mix of r- and K-strategists in the early stages to a dominance of K-strategists and fungi in the later stages. Specific bacterial taxa, such as unidentified Rhodospirillales and Oceanococcus, were more prevalent in eutrophicated seagrass waters, while Magnetospira and Nocardioide were more abundant in less eutrophicated waters by the end of the incubation. We speculated that these microbial groups likely adapted to utilise more RDOC, contributing to its decline. The decline in RDOC was approximately 2-times greater in less eutrophicated seagrass waters compared to more eutrophicated waters (26.9% and 14.5% decline respectively), which suggests that less eutrophicated seagrass ecosystems are more vulnerable. This study provides evidence that high nutrient loading can enhance RDOC remineralization, ultimately weakening the long-term carbon sequestration potential of seagrass ecosystems.

226. 题目: Probing Mineral-Organic Interfaces in Soils and Sediments Using Optical Photothermal Infrared Microscopy
文章编号: N24122208
期刊: Environmental Science & Technology
作者: Floriane Jamoteau, Mustafa Kansiz, Miriam Unger, Marco Keiluweit
更新时间: 2024-12-22
摘要: Interactions among microbes, minerals, and organic matter are key controls on carbon, nutrient, and contaminant dynamics in soils and sediments. However, probing these interactions at relevant scales and through time remains an analytical challenge due to both their complex nature and the need for tools permitting nondestructive and real-time analysis at sufficient spatial resolution. Here, we demonstrate the ability and provide analytical recommendations for the submicron-scale characterization of complex mineral-organic microstructures using optical photothermal infrared (O-PTIR) microscopy. Compared to conventional infrared techniques, O-PTIR spectra collected at submicron resolution of environmentally relevant mineral and organic reference compounds demonstrated similar spectral quality and sensitivity. O-PTIR detection sensitivity was greatest for highly crystalline minerals and potentially for low molecular weight organic compounds. Due to photothermal effects, O-PTIR was more sensitive toward organics than minerals compared to conventional IR approaches, even when organics were mineral-bound. Moreover, O-PTIR resolved mineral-bound and unbound organics in a complex mixture at submicron (<500 nm) resolution. Finally, we provide best practices for artifact-free analysis of organic and mineral samples by determining the appropriate laser power using damage thresholds. Our results highlight the potential of O-PTIR microscopy for nondestructive and time-resolved analysis of dynamic microbe-mineral-organic matter interactions in soils and sediments.

227. 题目: Ultrafast decomposition of refractory organics by electric field enhanced permanganate/peroxymonosulfate process
文章编号: N24122207
期刊: Chemical Engineering Journal
作者: Suo Liu, Ting Si, Jiahui Fan, Shuaishuai Yang, Qixin Pan, Ying Zhu, Min Li, Zhihua Sun, Yuzhu Fan, Chun Zhao
更新时间: 2024-12-22
摘要: A novel water treatment process called electrolysis-enhanced permanganate/peroxymonosulfate (E-PM-PMS) was investigated. The process demonstrated rapid degradation of persistent organic pollutants, such as carbamazepine (CBZ), diclofenac (DCF), and tetracycline (TC). For the degradation of ibuprofen (IBP), the E-PM-PMS process showed the highest mineralization ratio (55.76 %) and the lowest energy consumption (8.930 kWh m⁻³) within 120 min, compared with the PM-PMS (25.93 %, 61.814 kWh m⁻³) and E-PMS (31.07 %, 67.903 kWh m⁻³) processes. Mechanism studies indicated that the introduction of an electric field could promote the Mn(VII)/Mn(VI) cycle to form more permanganate (VI) complexes, resulting in the generation of more active species. Additionally, the MnO₂ produced in large amounts during the reaction could activate PMS to generate active species through the Mn(III)/Mn(IV) cycle, while also being activated by these active species to form Mn(V) and Mn(VI). Both the electric field and PMS reacting with PM led to the formation of various RMnS species (Mn(VI)_aq, Mn(V)_aq, Mn(IV)_s, and Mn(III)_aq). Through radical scavenging, electron paramagnetic resonance (EPR) experiments, it was proved that the degradation of IBP was mainly driven by reactive radicals, which are ${\text{SO}}_{\text{4}}^{\bullet -}$${\text{SO}}_{\text{4}}^{\bullet -}$ (72.24 %) and ^•OH (12.38 %). Twelve intermediate products were detected in total, and four possible degradation pathways for ibuprofen were identified. Within a certain range, increasing PMS concentration, PM dosage, current density, NO₃⁻ concentration, and decreasing the pH improved the efficiency of IBP elimination in the E-PM-PMS process, while Cl⁻, HCO₃⁻, PO₄³⁻, and humic acid hindered it. Overall, the E-PM-PMS process shows promise as an economical, eco-friendly, and efficient water treatment technique

228. 题目: Spatiotemporal dynamics of soil organic carbon in desert region and its response to climate change: A case study of Heihe river
文章编号: N24122206
期刊: Ecological Indicators
作者: Yuqing Chen, Haiyang Xi, Wenju Cheng
更新时间: 2024-12-22
摘要: Soil organic carbon (SOC) plays a vital role in regulating atmospheric CO2 levels. As global climate change intensifies, understanding the dynamics of the SOC pool becomes the key to assessing the potential for carbon sequestration in terrestrial ecosystems. However, the long-term response mechanisms of SOC density in desert regions to climate change remain unclear, increasing uncertainty in estimating the carbon sequestration potential of these ecosystems. This study aims to construct a comprehensive SOC database for the lower reaches of the Heihe River (HRL) and simulate the spatiotemporal distribution of SOC density within the 0 – 100 cm soil profile. The results indicate that the key indicators of different soil layers are not consistent for SOC density mapping in arid regions. Latitude (LAT), Elevation (ELE) and Normalized difference salinity index (NDSI) are particularly important in shallow soil layers (0–20 and 20–40 cm). Spatially, SOC density in the HRL is primarily distributed along river corridors, aligning closely with vegetation patterns. Additionally, SOC density shows a positive correlation with temperature and a negative correlation with precipitation. The period from the 2050 s to the 2060 s is a critical period for SOC changes in the HRL. Under the low-emission scenario (SSP 119), soil in the HRL shifted from being a carbon sink to a carbon source in the 2050 s. Under the medium-emission (SSP 245) and high-emission scenarios (SSP 585), soil remained a carbon sink overall but began transitioning around the 2060 s and 2050 s, respectively, before stabilizing. This study demonstrates significant carbon sequestration potential in arid region soils, highlighting their essential role in soil carbon storage that cannot be overlooked. The findings of this study provide data references and foundations for understanding the response of SOC in arid regions to climate change.

229. 题目: Enhanced activation of peroxymonosulfate by CuO modified biochar through mechanochemical synthesis: Insights into the roles of active sites and electron density redistribution
文章编号: N24122205
期刊: Journal of Environmental Chemical Engineering
作者: Xiaoqian Fu, Liangguo Yan, Haiqiang Qi, Wen Song, Yanfei Li, Xuguang Li
更新时间: 2024-12-22
摘要: Biochar (BC)-based materials have garnered significant attention in the realm of peroxymonosulfate-based advanced oxidation processes (PMS-AOPs). However, modulating the catalytic sites and charge distribution of BC to enhance PMS activation remains a challenge. In this study, we utilized mechanochemical technology to prepare a composite material of BC and CuO (BM BC-CuO). The characterization results and DFT calculations revealed that CuO modification could augment BC's defects and functional groups and modulate its charge distribution. Within 40 min of using only 20 mg/L of the catalyst, 99.55% of tetracycline (TC) was degraded. Besides, BM BC-CuO was loaded onto a sponge for continuous experiments, and TC degradation efficiency remained around 90% over 30 h. Hydroxyl radicals and singlet oxygen were the reactive species for TC degradation, while C=O, Cu-OH, and Cu(I) were the primary catalytic sites in BM BC-CuO/PMS system. The study presents an innovative approach for creating effective BC-based catalysts and enhances our comprehension of the functions of primary active entities in the catalyst/PMS framework.

230. 题目: Spectral and molecular insights into the variations of dissolved organic matter in shallow groundwater impacted by surface water recharge
文章编号: N24122204
期刊: Water Research
作者: Hongyu Ding, Mingxia Zheng, Lina Yan, Xiaoyu Zhang, Lu Liu, Yuanyuan Sun, Jing Su, Beidou Xi, Huibin Yu
更新时间: 2024-12-22
摘要: Dissolved organic matter (DOM) represents one of the most active elements in aquatic systems, whose fraction is engaged in chemical and biological reactions. However, fluorescence, molecular diversity and variations of DOM in groundwater systems with the alteration of surface water recharge remain unclear. Herein, Excitation–emission matrix (EEM) fluorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) combined with principal component coefficients, parallel factor analyses (PARAFAC) with two‒dimensional correlation spectroscopy (2D-COS) were applied in this study. EEM data reassembled for principal component analysis (PCA) highlighted differences in tryptophan-like peak between groundwater collected parallel to the river (PR) and those taken vertical to the river (VR). PARAFAC have identified six components, i.e., microbial-related humic substances (C1 and C6), protein-like substances (C2 and C5), and terrestrial humic-like substances (C3 and C4). In the PR direction, variations of fluorescence components were dominated by terrestrial humic-like substances, while microbial humic-like substances predominated in the VR direction, as revealed by 2D-COS analysis. FT-ICR MS data showed a similar DOM molecular evolution trend in groundwater. Specifically, biodegradable molecular formulas decreased with a diminishing contribution of river water to groundwater recharge. This decrease was accompanied by a decrease in O₃S and O₅S components, which highlight the influence of anthropogenic river water on groundwater DOM characteristics. Groundwater DOM variations were attributed to the influx of bioavailable and low-oxidized components and the release of terrestrial humic-like substances during river water recharge processes. This study contributes valuable insights into the transformations of DOM in groundwater systems influenced by surface water recharge, enhancing our understanding of the interplay between surface water and groundwater quality.

231. 题目: Enzyme activity and microbial resource limitation mediated the soil priming effect in response to straw C components in Clay and Loam
文章编号: N24122203
期刊: Journal of Soils and Sediments
作者: Yunfa Qiao, Jiarui Lan, Jiaojiao Lei, Xiaoyi Wang, Shujie Miao
更新时间: 2024-12-22
摘要:

Purpose

Priming effect (PE) of soil organic carbon induced by exogenous carbon (C) plays a crucial role in the turnover and storage of soil carbon pool, and it is strongly regulated by soil microorganism and extracellular enzyme. However, the understanding of the strength and microbial mechanisms of PE in response to exogenous carbon components, and where there is microbial resource limitation remains inadequate. Therefore, the aim of the study is to evaluate the microbial mechanisms of PE in response to exogenous carbon components.

Materials and methods

Three carbon components of rice straw (Lip-C, Wat-C and Res-C) and whole straw (Str-C) were added to Clay and Loam in laboratory experiment. During incubation, the CO₂ emission and ¹³C abundance were measured. Soil microbial biomass carbon (MBC), soil extracellular enzyme activity, PE and microbial resource limitation were checked at 37- and 65-day after incubation.

Results and discussion

Results showed that Wat-C, Res-C and Str-C addition induced positive PE, and the intensity of PE was in the order of Wat-C > Str-C > Res-C. Lip-C addition induced negative PE. The intensity of positive PE in Clay was higher than that of the negative PE in Loam. There were significant relationships between PE and extracellular C, N and P-cycling enzymes, which were much stronger on 37-day than 65-day after incubation. Soil microorganisms in Clay and Loam were largely limited by P and N on 37-day after incubation, respectively. On 65-day, the major microbial resource limitation was P in two soil types, except of N limitation in Clay with Res-C addition. The interaction of microbial growth, enzyme activity and PE depended on straw C component and soil nutrient.

Conclusions

All these findings improved out the knowledge of microbial resource limitation over straw C addition according to soil enzyme activity, and P might be another important driver as well as the effects of C and N on PE. The present results would have potential for predicting soil C dynamic and developing sustainable agricultural practices in the future.

232. 题目: Adsorption properties and competitive adsorption mechanism exhibited by carbon-nanotube-modified biochar for removal of crude oil and Ni(II) pollutants from water
文章编号: N24122202
期刊: Ecotoxicology and Environmental Safety
作者: Di Cao, Ruiyan Niu, Guanglu Mo, Huiwen Deng, Rui Liu, Jie Liu, Jialin Fan
更新时间: 2024-12-22
摘要: Carbon-nanotube-modified biochar (CNT3-CBC) with a nanostructured surface was prepared by using cattle manure as the raw material via the impregnation method. This modified biochar was then used to adsorb petroleum and Ni(II) from aqueous solutions. Various physicochemical characterization techniques were employed, including SEM, BET analysis, FTIR, and XPS. Kinetic and isothermal adsorption characteristics were analyzed. The influence of different biochar dosages, solution pH levels, and number of adsorption cycles on the efficiency of removal of crude oil and Ni(II) was meticulously evaluated. Results indicated that modified biochar had a higher surface area, a greater number of surface functional groups, and higher interaction forces compared to biochar. Adsorption kinetics and isotherms showed that modified biochar had a strong adsorption capacity. The experimental data conformed closely to the Elovich, Langmuir, and Freundlich adsorption models, underscoring the significant contributions of both physical and chemical adsorption mechanisms. Competitive adsorption of modified biochar in the co-sorption of petroleum and nickel solutions exists, and the modified biochar demonstrated high capacities for crude oil and Ni(II) in the competitive adsorption. The modified biochar prepared at a pyrolysis temperature of 800°C exhibited a superior adsorption performance, and the adsorption capacities of crude oil and Ni(II) were 303.03 mg·g−1 and 32.87 mg·g-¹ , respectively. Modified biochar has better regeneration potential after crude oil and Ni(II) adsorption, with the removal efficiency remaining above 50 % in the fourth cycle. As an efficient and environmentally friendly adsorbent, modified biochar shows great potential for removing crude oil and Ni(II) pollutants from water.

233. 题目: Probing Methylmercury Photodegradation by Different Fractions of Natural Organic Matter in Water: Degradation Kinetics and Mercury Isotope Fractionation Characteristics
文章编号: N24122201
期刊: Environmental Pollution
作者: Lian Zhang, Qingliang Dai, Huaqing Liu, Yanbin Li, Yongguang Yin, Guangliang Liu, Peng Dai, Xiaoqiang Cao, Jian Zhang, Yong Cai
更新时间: 2024-12-22
摘要: Recent advancements in mercury (Hg) isotopic fractionation research have evolved from conceptual demonstrations to practical applications. However, few studies have focused on revealing fractionation fingerprinting for aqueous methylmercury (MeHg) photodegradation due to its sensitivity to natural organic matter (NOM). Here, the impact of NOM fractions with varying chemical properties on MeHg photodegradation kinetics and Hg isotope fractionation characteristics was investigated. Findings reveal that reduced NOM, containing alcohol/phenol groups, slows the degradation rate compared to the oxidized. Low-molecular-weight NOM, rich in thiol groups, enhances the degradation rate more effectively than high-molecular-weight counterparts. Hydrophilic/hydrophobic-acidic/basic NOM also significantly influence the rate constant, with the highest for hydrophilic-acidic NOM. Isotopic analysis showed that NOM's redox properties affect the extent and direction of Hg isotope fractionation. NOM with various molecular weights controls mass-dependent and mass-independent fractionation by regulating MeHg-NOM triplet radical pairs reactions, likely due to differences in functional groups. Similar effects were observed for different hydrophilic/hydrophobic-acidic/basic fractions. Further experiments with scavenger addition indicated that direct photodegradation of MeHg-NOM is a possible degradation mechanism, with free radicals/reactive oxygen species playing a minor role. These findings underscore the sensitivity of both the degradation rates and Hg isotope fingerprinting to different NOM fractions.

234. 题目: Enhancing electricity generation and pollutant degradation in microbial fuel cells using cyanobacteria-derived biochar electrodes
文章编号: N24122115
期刊: Bioresource Technology
作者: Wentao Zhang, Daifei Xu, Yue Zhao, Degui Gao, Zhaotian Xie, Xinming Zhang, Bingdang Wu, Tianyin Huang, Lele Peng
更新时间: 2024-12-21
摘要: Utilizing microbial fuel cells (MFCs) technology to simultaneously achieve efficient biopower generation and pollutant degradation is a persistent pursuit. However, the limited rate of extracellular electron transfer (EET) and the availability of electrode materials remain key factors limiting the practical application of MFCs. In this article, modified carbon derived from cyanobacteria is applied to modify electrodes and assemble MFCs. By outputting voltage, power density, chemical oxygen demand removal rate and Coulombic efficiency the excellent bioelectricity performance of the assembled MFCs is demonstrated. The degradation performance of the assembled MFCs on various typical pollutants represented by tetracycline is illuminated, even up to 95.12%. Moreover, the pollutant removal mechanism by assembled MFCs is elucidated, including biofilm community and degradation pathway analysis. In a word, the enhanced EET process and high accessibility make the proposed MFC anode have fascinating application prospects in achieving efficient biopower generation and pollutant degradation simultaneously.

235. 题目: Interpreting Machine Learning Predictions of Pb2+ Adsorption onto Biochars Produced by a Fluidized Bed System
文章编号: N24122114
期刊: Journal of Cleaner Production
作者: Suya Shi, Yaji Huang, Han Shen, Tengfei Zheng, Xinye Wang, Mengzhu Yu, Lingqin Liu
更新时间: 2024-12-21
摘要: Employing machine learning to predict the Pb²⁺ adsorption capacity of biochars is an innovative pursuit in hazardous materials. This study compared artificial neural network (ANN), support vector regression (SVR) and random forest (RF) for Pb²⁺ adsorption capacity by biochar from a fluidized bed system. Besides developing correlations for comparison, the RF model (R² = 0.984, RMSE=0.054) outperformed both ANN (R² = 0.908, RMSE=0.316) and SVR (R² =0.667) in predicting higher adsorption capacity. Based on the superior performance, the Shapley Additive Explanations (SHAP) were employed on RF. SHAP global explanations indicated that adsorption conditions contributed 69.03% and biochar characteristics contributed 30.21%to adsorption capacity, highlighting Dosage (D) and Carbon (C) as the crucial factors. Regarding biochar characteristics, element compositions contributed 76.59%. The single samples demonstrated that the final predictions align with the experimental results. The synergistic effect of dependence plot explains the Pb²⁺ adsorption under varying parameter conditions, such as D<1g/L, C<45%, Pb_in>100mg/L, H<2.5, t>12h, T>25°C, pH>9, H/C>0.4, the SHAP value is positive, contributing to an increase in adsorption capacity. Furthermore, a graphical user interface (GUI) leveraging SHAP model parameters predicts adsorbent performance, providing novel insights into optimizing biochars production. The obtained findings narrow the search for optimal biochars adsorbents and might guide laboratory experiments and engineering application of Pb²⁺ removal using biochars.

236. 题目: Land use change effect on organic matter dynamics and soil carbon sequestration in the Brazilian Cerrado: A study case in Mato Grosso do Sul state (Midwest-Brazil)
文章编号: N24122113
期刊: Catena
作者: Fernanda Figueiredo Granja Dorilêo Leite, Ademir Fontana, Gabriel Nuto Nóbrega, Felipe Martini Santos, Bruno José Rodrigues Alves, Júlia Graziela da Silveira, Renato Campello Cordeiro, Carlos Eduardo Pellegrino Cerri, Rosemery Alesandra Firmino dos Santos, Renato de Aragão Ribeiro Rodrigues
更新时间: 2024-12-21
摘要: Pasture restoration and conservative agricultural practices, such as those used in Integrated Crop-Livestock-Forestry Systems (ICLF), can enhance soil protection and SOC stocks. This study, conducted in the Mato Grosso do Sul state, aimed to analyze the effect of land use conversion on C and N stocks and Soil Organic Matter (SOM) fractions to comprehend the C and N dynamic in 1-meter depth. Soil samples were collected in five different land uses in adjacent areas on the same farm: (1) Native Vegetation (NV); (2) Extensive Pasture (EP); (3) Managed Pasture (MP); (4) Integrated Crop-Livestock (ICL); and (5) Integrated Livestock-Forestry (ILF). Disturbed soil samples were collected using a soil auger at seven soil depthsfor elemental and isotopic analysis for soil C and N. Undisturbed samples were collected to assess the soil bulk density. The soil physical fractionationobtainedthe Particular Organic Matter (POM) and Mineral Associated Organic Matter (MAOM). The C and N stock varied from 86.02 in MP and 67.37 Mg ha−1in ICL and was statistically similar for all studied land uses. The δ13C signature varied between land uses and through the soil profile, with more negative values for NV and ILF (−27.83 and −21.73 ‰, respectively) in the topsoil. The POM fraction indicated changes in land use, and the POM in ICL shows the potential to restore soil C and health since it is just in the second year of intervention. The managed pastures withgrass speciesBrachiaria promoted better soil C and N content and stocks.This studypointed out other alternatives to land use, such as integrated systems (ICL and ILF), which should be the target for the Brazilian policies to mitigate greenhouse gas emissions and enhance the diversification and resilience of the agroecosystem.

237. 题目: Nitrogen-driven shifts in molecular composition of soil dissolved organic matter linked to rare bacterial sub-communities
文章编号: N24122112
期刊: Science of the Total Environment
作者: Xiaochun Yuan, Quanxin Zeng, Xinyu Bai, Xiaoqing Zhang, Xiaoting Fu, Mengxiao Ren, Juyan Cui, Qiufang Zhang, Xiaoli Gao, Jiacong Zhou, Yong Zheng, Kaimiao Lin, Yuehmin Chen
更新时间: 2024-12-21
摘要: The interaction between soil dissolved organic matter (DOM) and bacterial communities is critical for understanding key processes in the global carbon cycle. However, the molecular-level associations between these components remain poorly understood. To address this gap, high-resolution Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was combined with high-throughput sequencing to examine how DOM composition and bacterial sub-community diversity respond to different levels of nitrogen (N) addition (0, 40, and 80 kg N ha−1 yr−1) and to explore the relationships between them. The results demonstrate a significant decline in carbohydrate molecules within DOM under low N conditions. Conversely, the β-diversity and double bond equivalents of DOM molecules increased, indicating greater heterogeneity and stability in DOM composition under this treatment. Rare bacterial sub-communities, as opposed to abundant taxa, were more sensitive to N addition, exhibiting narrower ecological niches and weaker phylogenetic signals. β-Diversity decomposition analysis indicated that compositional differences in abundant taxa were primarily driven by richness differences, whereas those in rare taxa were predominantly influenced by species replacement. Co-occurrence network analysis revealed that DOM molecules were more frequently linked with rare taxa than with abundant taxa. Furthermore, a strong positive relationship was observed between the β-diversity of rare taxa and that of DOM molecules along the N gradient. These findings underscore that rare bacterial sub-communities are the primary drivers of changes in DOM molecular composition under N enrichment, emphasizing their potential role in shaping chemical diversity.

238. 题目: Investigation of adsorption parameters of saxitoxin onto loblolly pine-derived biochar synthesized at various pyrolysis temperature
文章编号: N24122111
期刊: Chemosphere
作者: Cadianne Chambers, Savannah Grimes, Russell C Smith, Ayden Weil, M Toufiq Reza
更新时间: 2024-12-21
摘要: This study highlights the use of loblolly pine derived biochar for the removal of harmful algal bloom toxin, Saxitoxin (STX), from water. Biochar samples were prepared at varying pyrolysis temperatures (400, 600 and 800 °C) for 60 min. As pyrolysis temperature increases, enhancement in surface porosity was observed (S_BET = 7.26 ± 0.2 m²/g to 408.15 ± 6.19 m²/g) while a decline in oxygen-containing functional groups was observed (1517.80 ± 14.98 μmol/g to 823.01 ± 7.72 μmol/g). This study aimed to discover the effects of adsorption parameters such as biochar dosage amount, contact time, initial concentration and initial pH on Saxitoxin adsorption. These studies revealed impressive results with >90 % toxin removal with dosage rate of 0.01 g/L, contact time of 30 min, and increasing percent removal with increasing initial STX concentration and initial pH in water. Maximum uptake was calculated for P400 with adsorption capacity of 314.37 μg/g. This showed that surface functionality showed higher affinity for STX uptake, which may be possible due to hydrogen bonding, electrostatic interactions, ion-exchange, and π-π interactions. Applied kinetic models indicated both physisorption and chemisorption interactions with best fit supporting the Elovich models. Complementary, adsorption isotherm analysis confirmed the multilayer adsorption behavior of the Freundlich model. Therefore, these findings support the viable use of biochar material for the remediation of STX waters.

239. 题目: Effects of biochar on soil contaminated by metals and metalloids from slag disposal of an old environmental liability in Ribeira Valley, Brazil
文章编号: N24122110
期刊: Journal of Environmental Management
作者: Jacqueline Zanin Lima, Valéria Guimarães Silvestre Rodrigues
更新时间: 2024-12-21
摘要: Contamination with potentially toxic metals and metalloids (PTMs) in mining areas poses significant environment and human health risks. Using biochar as an amendment can be a cost-effective and eco-friendly method to reduce PTM bioavailability in contaminated soils, thus lowering plant uptake. This study investigated biochar derived from the organic fraction of municipal solid waste (OFMSW) at three pyrolysis temperatures (300, 500, and 700 °C) and two application rates (1% and 5%, w/w) for the remediation of slag-contaminated soils from an old environmental liability in the Ribeira Valley (Brazil). The results showed Zn > Pb > Cu > As > Co > Cr > Cd > Ni pseudo-total concentrations in slag with concentrations of As, Cu, Pb, and Cd posing greater environmental risks due to their toxicity. The biochar addition exerted limited effects on chemical fractionation, likely due to soil alkalinity, and BC300 5% increased As availability. A 1% biochar addition improved maize (Zea mays) growth, whereas 5% BC500 and BC700 were phytotoxic. The highest bioconcentration factor (BCF) values were observed for Cr, Cu, Ni, and Zn, which are all essential nutrients for plants; however, translocation factor (TF) from roots to shoots was generally low. A combination of BCF and TF < 1 suggested mechanisms limiting PTM uptake and translocation in plants. Pb showed a high ecological risk potential (Eri), with hazard quotients (HQ) exceeding 1 for the slag. BC700 5% provided the most promising Eri for As, Pb, and Zn; however, it proved toxic to maize, highlighting the need for multidisciplinary research and biochar's potential in site remediation. Further treatments are necessary for enhancing the retention efficiency or exploring combinations with other organic or inorganic amendments.

240. 题目: The development of multifunctional biochar with NiFe2O4 for the adsorption of Cd (II) from water systems: The kinetics, thermodynamics, and regeneration
文章编号: N24122109
期刊: Journal of Environmental Management
作者: Makhosazana Masuku, Jemal Fito Nure, Harrison I Atagana, Ntuthuko Hlongwa, Thabo T I Nkambule
更新时间: 2024-12-21
摘要: High concentrations of Cd (II) in wastewater have been reported several times which attracted top research attention to mitigate the pollution impacts of the contaminant. Therefore, this study aimed to develop a Zn-doped NiFe2O4− pinecone biochar composite (ZNiF@PB) for the adsorption of Cd (II) from wastewater. FTIR confirmed immobilization of PB on the surface of ZNiF by the presence of C = O at 1638 cm−1, COOH at 1385 cm−1, C-O at 1009 cm−1 and Fe-O at 756 cm−1. Similarly, XRD determined the crystallite structure of the adsorbents where the ZNiF crystallite size of 43 nm was obtained while the particle size of ZNiF@PB was found to be 38 nm. These XRD results agreed with those values obtained from TEM images showing ZNiF and ZNiF@PB had a spherical shape with similar particle sizes. On the other hand, the surface areas of ZNiF, PB, and ZNiF@PB were found to be 78.4 m2/g, 125 m2/g, and 104 m2/g, respectively. These high surface areas have a huge potential to enhance Cd removal. With these adsorbents, the maximum Cd (II) adsorption of 96% was recorded at the optimum experimental condition of adsorbent dosage 0.5g/50 mL, solution pH 6, initial Cd (II) concentration 100 mg/L, and contact time 120 min. Practical adsorption kinetics data were well described by the pseudo-second order model whereas the adsorption isotherm was a perfect fit to the Langmuir isothermal model implying the adsorption process to be a monolayer with mainly a chemically bonded mechanism. In conclusion, this adsorbent is efficient for the adsorption of Cd (II) from wastewater and has also a huge potential to be applied for industrial-scale water purification.