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181. 题目: Deciphering N-Doped Biochar Design for Non-Radical Pathways through Hierarchical Machine Learning
文章编号: N24040606
期刊: ACS ES&T Engineering
作者: Rupeng Wang, Zixiang He, Honglin Chen, Ke Wang, Shiyu Zhang, Nanqi Ren, Shih-Hsin Ho
更新时间: 2024-04-06
摘要: Biochar has been widely employed for the promotion of advanced oxidation processes (AOPs) and when combined with nitrogen doping for charge distribution mediation, N-doped biochar (NBC) can serve as a highly effective catalyst for the degradation of persistent organic pollutants. However, due to the variety of doping and preparation methods, the intrinsic active sites for AOP catalysis have not been clearly identified. Furthermore, the complex relationships between preparation method, material properties, and catalytic degradation pathways remain unclear, impeding the widespread practical application of NBC. Herein, machine learning (ML) was implemented to predict the degradation pathway and identify the vital properties of N-doping required for the acceleration of AOPs. During the process of model training, an innovative method of data set splitting was applied, comparing the results generated from multiple models to enhance model interpretability. We elucidated the correlation between the primary features and nonradical pathway, focusing on the contribution of N species and the regulatory role of pyrolysis temperature. Detailed insights were further provided to enhance the ratio design of NBC for nonradical mediation. Overall, this study offers novel insights into NBC-mediated AOPs for pollution control, underscoring the significant potential of ML for accelerating catalyst applications.

182. 题目: Alternation between terrestrial and aquatic plants dominated organic matter sources in the Tiaoshu wetland (south China) and its response to late Pleistocene environmental changes
文章编号: N24040605
期刊: Palaeogeography, Palaeoclimatology, Palaeoecology
作者: Jingqiang Chen, Jibin Xue, Yanting Li, Luhua Xie, Jia Huo, Mingyi Chen
更新时间: 2024-04-06
摘要: Widely distributed wetlands in China play an important role in the global carbon cycle. However, the long-term response of wetland evolution and carbon storage in tropical southern China to climate change remains unclear. Here, we present a sediment core record from the Tiaoshu Wetland in the northern Leizhou Peninsula and multiple proxy indicators are investigated, with the aim of better understanding past vegetation and environmental changes. The following conclusions were drawn: (i) The organic matter deposited in the Tiaoshu Wetland was mainly derived from terrestrial C3 plants and aquatic plants growing in and/or around the catchment. The temporal variability in the relative proportions of organic matter contributed by various sources revealed paleoenvironmental changes in the study area, generally consistent with regional and global climate records. (ii) The peat formation pattern in the Tiaoshu Wetland is in contrast to some individual sites reported in subtropical China, suggesting that there may be different peat formation patterns in the tropical and subtropical regions of China, which may be closely related to specific hydrothermal conditions in different regions. In addition, by comparison with atmospheric CH concentrations, our results suggest potential relationships between the evolution of wetlands in tropical China and global atmospheric CH cycles.

183. 题目: Deciphering the Roles of Extracellular Polymeric Substances (EPS) in Shaping Disinfection Kinetics through Permanent Removal via Genetic Disruption
文章编号: N24040605
期刊: Environmental Science & Technology
作者: Hong Sun, Zhen-Jie Zhou, Han-Quan Wen, Fei-Fei Chen, Yuan Pan, Qiang Tang, Han-Qing Yu
更新时间: 2024-04-06
摘要: Extracellular polymeric substances (EPS) ubiquitously encapsulate microbes and play crucial roles in various environmental processes. However, understanding their complex interactions with dynamic bacterial behaviors, especially during the disinfection process, remains very limited. In this work, we investigated the impact of EPS on bacterial disinfection kinetics by developing a permanent EPS removal strategy. We genetically disrupted the synthesis of exopolysaccharides, the structural components of EPS, in Pseudomonas aeruginosa, a well-known EPS-producing opportunistic pathogen found in diverse environments, creating an EPS-deficient strain. This method ensured a lasting absence of EPS while maintaining bacterial integrity and viability, allowing for real-time in situ investigations of the roles of EPS in disinfection. Our findings indicate that removing EPS from bacteria substantially lowered their susceptibility threshold to disinfectants such as ozone, chloramine B, and free chlorine. This removal also substantially accelerated disinfection kinetics, shortened the resistance time, and increased disinfection efficiency, thereby enhancing the overall bactericidal effect. The absence of EPS was found to enhance bacterial motility and increase bacterial cell vulnerability to disinfectants, resulting in greater membrane damage and intensified reactive oxygen species (ROS) production upon exposure to disinfectants. These insights highlight the central role of EPS in bacterial defenses and offer promising implications for developing more effective disinfection strategies.

184. 题目: Research advances on production and application of algal biochar in environmental remediation
文章编号: N24040604
期刊: Environmental Pollution
作者: Chongqing Wang, Xiao Lin, Xiuxiu Zhang, Pau Loke Show
更新时间: 2024-04-06
摘要: Algae, comprising microalgae and macroalgae, have emerged as a promising feedstock for the production of functional biochar. Recently, the application of algal biochar in environmental remediation gains increasing attention. This review summarizes research advancements in the synthesis and application of algal biochar, a versatile and sustainable material for environmental remediation ranging from wastewater treatment to soil improvement. Algal biochar can be prepared by pyrolysis, microwave-assisted pyrolysis, and hydrothermal carbonization. Physical and chemical modifications have proven to be effective for improving biochar properties. Algal biochar is promising for removing diverse pollutants including heavy metals, organic pollutants, and microplastics. The role in soil improvement signifies a sustainable approach to enhancing soil structure, nutrient retention, and microbial activity. Research gaps are identified based on current understanding, necessitating further exploration into variations in biochar characteristics, the performance improvement, large-scale applications, and the long-term evaluation for environmental application. This review provides a better understanding of algal biochar as a sustainable and effective tool in environmental remediation.

185. 题目: Photooxidation-Initiated Aqueous-Phase Formation of Organic Peroxides: Delving into Formation Mechanisms
文章编号: N24040604
期刊: Environmental Science & Technology
作者: Tania Gautam, Erica Kim, Lisa Ng, Vikram Choudhary, Jessica Lima Amorim, Max Loebel Roson, Ran Zhao
更新时间: 2024-04-06
摘要: Formation of highly oxygenated molecules (HOMs) such as organic peroxides (ROOR, ROOH, and H2O2) is known to degrade food and organic matter. Gas-phase unimolecular autoxidation and bimolecular RO2 + HO2/RO2 reactions are prominently renowned mechanisms associated with the formation of peroxides. However, the reaction pathways and conditions favoring the generation of peroxides in the aqueous phase need to be evaluated. Here, we identified bulk aqueous-phase ROOHs in varying organic precursors, including a laboratory model compound and monoterpene oxidation products. Our results show that formation of ROOHs is suppressed at enhanced oxidant concentrations but exhibits complex trends at elevated precursor concentrations. Furthermore, we observed an exponential increase in the yield of ROOHs when UV light with longer wavelengths was used in the experiment, comparing UVA, UVB, and UVC. Water-soluble organic compounds represent a significant fraction of ambient cloud-water components (up to 500 μM). Thus, the reaction pathways facilitating the formation of HOMs (i.e., ROOHs) during the aqueous-phase oxidation of water-soluble species add to the climate and health burden of atmospheric particulate matter.

186. 题目: Continuous planting of Chinese fir monocultures significantly influences dissolved organic matter content and microbial assembly processes
文章编号: N24040603
期刊: Science of the Total Environment
作者: Chuifan Zhou, Qianian Gao, Mulualem Tigabu, Shuzhen Wang, Sheng Cao, Yuanchun Yu
更新时间: 2024-04-06
摘要: Monoculture plantations in China, characterized by the continuous cultivation of a single species, pose challenges to timber accumulation and understory biodiversity, raising concerns about sustainability. This study investigated the impact of continuous monoculture plantings of Chinese fir ( [Lamb.] Hook.) on soil properties, dissolved organic matter (DOM), and microorganisms over multiple generations. Soil samples from first to fourth-generation plantations were analyzed for basic chemical properties, DOM composition using Fourier transform ion cyclotron resonance mass spectrometry, and microorganisms via high-throughput sequencing. Results revealed a significant decline in nitrate nitrogen content with successive rotations, accompanied by an increase in easily degradable compounds like carbohydrates, aliphatic/proteins, tannins, Carbon, Hydrogen, Oxygen and Nitrogen- (CHON) and Carbon, Hydrogen, Oxygen and Sulfur- (CHOS) containing compounds. However, the recalcitrant compounds, such as lignin and carboxyl-rich alicyclic molecules (CRAMs), condensed aromatics and Carbon, Hydrogen and Oxygen- (CHO) containing compounds decreased. Microorganism diversity, abundance, and structure decreased with successive plantations, affecting the ecological niche breadth of fungal communities. Bacterial communities were strongly influenced by DOM composition, particularly lignin/CRAMs and tannins. Continuous monoculture led to reduced soil nitrate, lignin/CRAMs, and compromised soil quality, altering chemical properties and DOM composition, influencing microbial community assembly. This shift increased easily degraded DOM, accelerating soil carbon and nitrogen cycling, ultimately reducing soil carbon sequestration. From environmental point of view, the study emphasizes the importance of sustainable soil management practices in continuous monoculture systems. Particularly the findings offer valuable insights for addressing challenges associated with monoculture plantations and promoting long-term ecological sustainability.

187. 题目: Bismuth oxymetallate-modified biochar derived from Euryale ferox husk for efficient removal of Congo red from wastewater: adsorption behavior and mechanisms
文章编号: N24040603
期刊: Environmental Science and Pollution Research
作者: Luxin Zhang, Qunshuai Li, Xiaobing Liu, Weiwei Shi,
更新时间: 2024-04-06
摘要: Using Euryale ferox husk as raw material, pristine biochar (EBC), Bi2MoO6-modified biochar (BM-EBC), and BiFeO3-modified biochar (BF-EBC) were prepared and employed for decontaminating Congo red (CR) from wastewater. Compared with EBC (217.59 mg/g) and BF-EBC (359.49 mg/g), a superior adsorption capacity of 460.77 mg/g was achieved by BM-EBC. Based on the evaluation results of the Freundlich and pseudo-second-order models, multilayer chemisorption was suggested as the adsorption mechanism. The adsorption process of BM-EBC was spontaneous and endothermic, and the rate-limiting step pertained to liquid film diffusion and intraparticle diffusion. The underlying removal mechanism was explored via SEM, BET, FTIR, XPS, Raman spectra, and Zeta potential analyses. The introduction of bismuth oxymetallates with their high number of M–O (M: Bi, Mo, Fe) structural elements provided the adsorbent with enlarged surface areas and reinforced oxygen functional groups, thereby promoting pore filling, π-π interactions, hydrogen bonding, and complexation, leading to enhanced adsorption capacity. These results demonstrate that Euryale ferox husk biochar modified by bismuth oxymetallates has high prospects for valorizing biomass waste and removing CR from wastewater.

188. 题目: Influence of natural organic matter on nanoscale zero-valent iron for contaminants removal in water: A critical review
文章编号: N24040602
期刊: Chemical Engineering Journal
作者: Zhaoli Liu, Jiahui Fu, Airong Liu, Wei-Xian Zhang
更新时间: 2024-04-06
摘要: Nanoscale zero-valent iron (nZVI) is attracting a great deal of attention for its widely study in the fields of groundwater remediation and wastewater treatment. Natural organic matter (NOM) widely exists in nature, and its complexity and specificity inevitably affect the process of nZVI removing contaminants. In this review, how NOM influences nZVI performance in contamination remediation is well summarized. Firstly, the influence of NOM on properties of nZVI is consolidated. This includes overcoming its tendency to easily aggregate and sediment, improving its transport in groundwater, affecting its structural transformation, and decreasing its toxicity. Furthermore, the latest viewpoints about possible influence mechanisms of NOM on various contaminants removal by nZVI are sorted out. The effect of NOM is changed with different situations and composed of multiple synergies, such as competing reactive sites, being as an electron shuttle, supporting nZVI dispersion, and so on. Finally, the challenge and future development of nZVI environmental application in the presence of NOM are summarized from theoretical and practical perspectives. Overall, this review aims at providing a reference specifically for the environmental application of nZVI and the prediction of products fate with NOM existence.

189. 题目: Storm-driven hydrological, seasonal, and land use/land cover impact on dissolved organic matter dynamics in a mid-Atlantic, USA coastal plain river system characterized by 21 T FT-ICR mass spectrometry
文章编号: N24040602
期刊: Frontiers in Environmental Science
作者: Tianyin Ouyang, Amy M. McKenna, Andrew S. Wozniak
更新时间: 2024-04-06
摘要: Introduction: Dissolved organic matter (DOM) as primary and secondary energy sources can be transported via rivers to estuaries and impact coastal biogeochemical cycles. Storm-induced high discharge events can alter the dominant river flow paths and enhance leaching of shallow organic-rich soil layers, leading to elevated terrestrial DOM export. Land use/land cover (LULC) and associated anthropogenic interventions (including artificial reservoirs and agricultural irrigation) can control sources and transformation processes of exported DOM along with hydrologic factors. The relative significance of LULC, hydrological factors, and temperature variations with seasons will differ depending on geographical locations and complicate their incorporation in biogeochemical models of DOM dynamics. This study investigates the role of LULC, seasonality, and storm events on DOM concentrations and molecular composition in the Murderkill River system.

190. 题目: Enhanced CO2 uptake of the coastal ocean is dominated by biological carbon fixation
文章编号: N24040601
期刊: Nature Climate Change
作者: Moritz Mathis, Fabrice Lacroix, Stefan Hagemann, David Marcolino Nielsen, Tatiana Ilyina, Corinna Schrum
更新时间: 2024-04-06
摘要:

Observational reconstructions indicate a contemporary increase in coastal ocean CO2 uptake. However, the mechanisms and their relative importance in driving this globally intensifying absorption remain unclear. Here we integrate coastal carbon dynamics in a global model via regional grid refinement and enhanced process representation. We find that the increasing coastal CO2 sink is primarily driven by biological responses to climate-induced changes in circulation (36%) and increasing riverine nutrient loads (23%), together exceeding the ocean CO2 solubility pump (41%). The riverine impact is mediated by enhanced export of organic carbon across the shelf break, thereby adding to the carbon enrichment of the open ocean. The contribution of biological carbon fixation increases as the seawater capacity to hold CO2 decreases under continuous climate change and ocean acidification. Our seamless coastal ocean integration advances carbon cycle model realism, which is relevant for addressing impacts of climate change mitigation efforts.

191. 题目: Soil organic matter thermal pools as influenced by depth, tillage, and soil texture – A Rock-Eval® analysis study on the cropland soils of the Swiss Plateau
文章编号: N24040601
期刊: Geoderma
作者: Cedric Deluz, David Sebag, Eric Verrecchia, Pascal Boivin
更新时间: 2024-04-06
摘要: This study investigated the relationships between the soil organic matter content (SOM), SOM thermal pools, soil properties, and tillage practices, on cropland soils of the central plateau of Switzerland. Soil samples were collected in 45 no-till and conventional tillage fields in five layers from 0 to 40 cm depth. Soil organic carbon content (SOC) and hydrocarbon compound (HC) pools were analysed with Rock-Eval® thermal analysis. In addition, the clay content was determined by sedimentation.

192. 题目: Modeling of Cd(II) adsorption on iron (hydr)oxide–organic composites: deviations from additive adsorption in composite sorption systems
文章编号: N24040420
期刊: Environmental Earth Sciences
作者: Xin Nie, Erping Bi
更新时间: 2024-04-04
摘要:

Due to the complexity of ligand-charge distribution models and the controversies regarding the additivity of heavy metal adsorption on iron (hydr)oxides–organic composites, a convenient criterion for determining additivity was proposed in this study, based on the modeling results of the component additivity method and the Cd adsorption mechanisms on the composites. The content of humic acid (HA) (3–41%) and iron (hydr)oxides properties (e.g., specific surface area) are the main factors affecting the simulation results. The reason is that the electrostatic interaction between the components in composites changes the affinity between them and Cd. By optimizing the stability constants for Cd adsorption on ferrihydrite (Fh)/goethite (Gt) and HA, the simulation deviation of Cd adsorption on Fh–HA composites can be reduced from around 10% to less than 5%, while that on Gt–HA composites can be reduced from 10 to 60% to less than 10%. The carboxyl group of HA (HA–COOH) and the single-coordinated hydroxyl group of iron minerals (≡FeOH0.5−) are the main functional groups that bind to Cd. The ratio of covered HA–COOH (i.e., deactivated HA–COOH) to ≡FeOH0.5− can be used as a criterion for determining additivity. When the ratio exceeds 0.2, the simulation deviation caused by electrostatic interaction cannot be ignored and it is necessary to optimize the stability constant for Cd adsorption on each component. This method is convenient to predict adsorption of cationic heavy metals on iron (hydr)oxides–organic composites in the environment.

193. 题目: Meta-Analysis of N2O Emissions as Affected by Biochar Amendment in Northern China
文章编号: N24040419
期刊: Water, Air, & Soil Pollution
作者: Can Chen, Kexin Wang, Hongxia Zhu
更新时间: 2024-04-04
摘要:

Global warming is one of the eco-environmental problems of most concern to scientists. N2O, an atmospheric greenhouse gas, has been widely studied because of its high warming potential. As an excellent soil conditioner, biochar has a very broad research value and application path in the farmland. This work examined the impact of biochar application on N2O emissions reduction potential of farmland soils in northern China by meta analysis and path analysis. The results were as follows: the N2O emissions reduction potential changes corresponded with different biochar preparation materials, preparation temperature, C/N ratio and pH. Biochar is more suitable for application in soil with a bulk density < 1.3 g cm−3, sandy loam texture, neutral pH, organic matter content 20–30 g kg−1, soil C/N ratio 10–20, and total nitrogen < 2 g kg−1. At the same time, the maximum reduction of N2O emissions can be achieved in a scenario where the biochar is applied at 20 t ha−1- 40 t ha−1 and the application of nitrogen fertilizer is 100–200 kg N ha−1. Under the above ideal conditions, this study selected the data of soil mineralized nitrogen (X1), soil organic matter content (X2), soil water content (X3), average temperature (X4), total nitrogen (X5), and N2O emissions (Y) for correlation analysis and path analysis, and finally obtained the multiple stepwise regression equation between N2O emissions and various impact factors as follows: Y = -45.9102 + 0.6874X1 + 0.4634X2 + 0.3249X3 + 0.2698X4 + 0.2218X5 (R2 = 0.826, p < 0.01, n = 87). The direct relationships between N2O and soil mineralized nitrogen and soil organic matter content were very significant (P < 0.01). The second is soil water content, average temperature and total nitrogen. Indirect relationships between N2O and average temperature, total nitrogen and mineralized nitrogen were significant (P < 0.05).

Graphical

194. 题目: Long-term restoration with organic amendments is clearer evidenced by soil organic matter composition than by changes in microbial taxonomy and functionality
文章编号: N24040418
期刊: Applied Soil Ecology
作者: José A Siles, José M De la Rosa, José A González-Pérez, Vanesa Fernández-Pérez, Celia García-Díaz, José L Moreno, Carlos García, Felipe Bastida
更新时间: 2024-04-04
摘要: Here, a degraded soil, located in a semi-arid Mediterranean region, was characterized 17 years after organic amendment with sludge or compost (differing in their stabilization degree) for restoration purposes. To do this, (i) soil physicochemical properties and plant cover, (ii) soil organic matter (SOM) content and composition, (iii) soil basal respiration and enzymatic activities, and (iv) abundance, taxonomic composition, and functionality (shotgun metagenomics) of microbial communities were studied. Increased SOM and nutrient contents were found in soil from amended plots with respect to the control, with no differences between amendment types. This is explained by the lasting effects of organic amendments and the higher plant cover. Thermal and pyrolytic analyses showed that the restoration process enriched soil mainly with SOM of intermediate recalcitrance and of high chemical diversity. SOM composition did not differ between amendment types. Increased microbial abundances and activities were found in the amended plots, without differences between compost and sludge. Shotgun metagenomics showed that microbial communities changed in taxonomic and functional terms between amended and unamended plots, but these differences were rather limited. The taxonomic differences between treatments were mainly driven by increasing abundances of Actinobacteria and decreasing abundances of Proteobacteria in soil from amended plots. Soil microbial communities in amended plots showed some functional adaptation to the increased nutrient contents and predominant nutrients forms. This, together with the higher microbial abundances detected, explained the conspicuous soil enzymatic activities reported in amended plots. The effectiveness of the studied soil restoration process was confirmed here from an integrative perspective.

195. 题目: Effect of pyrolysis temperature and molecular weight on characterization of biochar derived dissolved organic matter from invasive plant and binding behavior with the selected pharmaceuticals
文章编号: N24040417
期刊: Environmental Pollution
作者: Wangyu Wang, Minghua Nie, Caixia Yan, Yulong Yuan, Aoxue Xu, Mingjun Ding, Peng Wang, Min Ju
更新时间: 2024-04-04
摘要: A comprehensive understanding of the characteristics of biochar released-dissolved organic matter (BDOM) derived from an invasive plant and its impact on the binding behavior of pharmaceuticals is essential for the application of biochar, yet has received less attention. In this study, the binding behavior of BDOM pyrolyzed at 300–700 °C with sulfathiazole, acetaminophen, chloramphenicol (CAP), and carbamazepine (CMZ) was investigated based on a multi-analytical approach. Generally, the pyrolysis temperature exhibited a more significant impact on the spectral properties of BDOM and pharmaceutical binding behavior than those of the molecular weight. With increased pyrolysis temperature, the dissolved organic carbon decreased while the proportion of the protein-like substance increased. The highest binding capacity towards the drugs was observed for the BDOM pyrolyzed at 500 °C with the molecular weight larger than 0.3 kDa. Moreover, the protein-like substance exhibited higher susceptive and released preferentially during the dialysis process and also showed more sensitivity and bound precedingly with the pharmaceuticals. The active binding points were the aliphatic C–OH, amide II N–H, carboxyl CO, and phenolic-OH on the tryptophan-like substance. Furthermore, the binding affinity of the BDOM pyrolyzed at 500 °C was relatively high with the stability constant (log) of 4.51 ± 0.52.

196. 题目: Characterizing the regional distribution, interaction with microorganisms, and sources of dissolved organic matter for summer rainfall: Insights from spectroscopy, community structure, and back-trajectory analyses
文章编号: N24040416
期刊: Science of the Total Environment
作者: Chenbin Wu, Yuting Zhao, Yuting Geng, Kun Shi, Shilei Zhou
更新时间: 2024-04-04
摘要: Dissolved organic matter (DOM) in rainfall participates in many biogeochemical cycles in aquatic environments and affects biological activities in water bodies. Revealing the characteristics of rainfall DOM could broaden our understanding of the carbon cycle. Therefore, the distribution characteristics and response mechanisms of DOM to microorganisms were investigated in different regions of Hebei. The results indicated that the water quality of the northern region was worse than that of the middle and southern regions. The two protein like components (C1, C2) and one humic like component (C3) were obtained; at high molecular weight (MW), the fluorescence intensity is high in the northern region (0.03 ± 0.02 R.U.), while at low MW, the fluorescence intensity is highest in the southern region (0.50 ± 0.18 R.U.). Furthermore, C2 is significantly positively correlated with C1 ( < 0.01), while C2 is significantly negatively correlated with C3 ( < 0.05) was observed. The spectral index results indicated that rainfall DOM exhibited low humification and highly autochthonous characteristics. The southern region obtained higher richness and diversity of microbial species than northern region ( < 0.05). The community exhibits significant spatiotemporal differences, and the , , and , were dominant genus. Redundancy and network analyses showed that the effects of C1, C2, and nitrate on microorganisms increased with decreasing MW, while low MW exhibited a more complex network between DOM and microorganisms than high MW. Meanwhile, C1, C2 had a large total effect on -diversity and function through structural equation modeling. The backward trajectory model indicates that the sources of air masses are from the northwest, local area, and sea in the northern, middle, and southern regions, respectively. This study broadened the understanding of the composition of summer rainfall DOM and its interactions with microorganisms during rainfall.

197. 题目: Characterization of dissolved organic matter in rivers impacted by acid mine drainage: Components and complexation with metals
文章编号: N24040415
期刊: Science of the Total Environment
作者: Fangqing Li, Lezhang Wei, Yu Liu, Hongmei Deng, Jinli Cui, Jianqiao Wang, Tangfu Xiao
更新时间: 2024-04-04
摘要: Dissolved organic matter (DOM), a ubiquitous and active ingredient, is extensively involved in the transformation and migration of environmental pollutants in aquatic ecosystems. However, its chemical composition in acid mine drainage (AMD)-impacted rivers remains poorly characterized, hindering our understanding of its role in the biogeochemistry of key elements in contaminated fluvial environments. Here, we investigated the concentration of dissolved organic carbon (DOC) and spectroscopic and molecular characteristics of DOM in a headwater river contaminated with polymetallic mine-derived AMD in southern China. Terrestrial humic-like (C1) and typically groundwater-supplied aromatic protein/tyrosine-like (C2) substances which were partially from AMD, were identified as the predominant fluorescent components in the river water. Notably, tryptophan-like (C3) substances originating from tailings pond spills were only occasionally detected in the river. Although DOM biogeochemical transformations and degradation occurred in the lateral soil-water riparian interface and longitudinal in-stream transport processes, the molecular compositions identified by FT-ICR MS showed a core set of molecular formulae in the lignin/saturated compound/tannin region of the van Krevelen diagram of the water samples across the rivers. The complexation of DOM with typical metals in AMD was investigated using fluorescence quenching experiments. The results showed that the highest binding ability of Fe(III) to C2 followed by C1, with both detected in the experimental water samples. Mg(II) and Ca(II) strengthened the binding of DOM-Fe(III) when the ferric/DOM ratio was low, while Cu(II) weakened the binding of DOM-Fe(III) due to competition. Ca(II) inhibited the binding of Fe(III) to C1 but promoted the binding of the complex to C2 when both Cu(II) and Mg(II) were present. Since DOM-Fe(III) complexation was associated with the cotransport of AMD-derived metals/metalloids in diverse aqueous environments with multiple co-existing ions (typically Ca(II) input for remediation), our study on the composition of DOM and its complexation with metals can contribute to managing and remediating AMD-impacted rivers.

198. 题目: Applying biochar coupled with pyrite substrates simultaneously enhanced nutrient and heavy metal removal in constructed wetland: Performance and mechanism
文章编号: N24040414
期刊: Chemical Engineering Journal
作者: Likui Feng, Yan Zhang, Jiaxuan Yang, Zizhang Guo, Jian Zhang, Haiming Wu
更新时间: 2024-04-04
摘要: Wastewater polluted by heavy metals with low C/N ratio posed a big challenge to constructed wetlands (CWs) for sustainable advanced wastewater purification. In this study, biochar coupled with pyrite was successfully applied in CWs to simultaneously remove organics, total nitrogen (TN), total phosphorus (TP) and heavy metals, with the highest removal efficiency of 95.78%, 98.78%, 96.22% and 99.91%, respectively. Batch tests proved that the complexation of ferric hydroxide from pyrite oxidation played an important role in TP and heavy metals removal. Meanwhile, fluorescence excitation-emission matrix combined with parallel factor analysis (EEM-PARAFAC) further manifested that protein-like substances contributed a lot to heavy metals stabilization. Moreover, the multiplication of , at phylum level and at genus level, which were capable of heterotrophic or autotrophic nitrate reducing process indicated that the denitrification capacity of CWs was significantly enhanced by biochar and pyrite. This study provided a feasible insight into the application of CWs with biochar and pyrite addition to enhance the treatment of low C/N wastewater.

199. 题目: Leaching characteristics of nutrients in food waste digestate-derived biochar
文章编号: N24040413
期刊: Bioresource Technology
作者: Xiaoxiao Zhang, Yuqing Sun, Qiaozhi Zhang, Wenjing Tian, Eakalak Khan, Daniel C W Tsang
更新时间: 2024-04-04
摘要: Food waste anaerobic digestion requires proper utilization of solid digestate, and pyrolysis emerges as an effective method to produce nutrient-rich biochar. This study investigated the leaching characteristics and speciation changes of nutrients in food waste digestate (FWD)-derived biochar pyrolyzed at 350 °C (BC350), 450 °C (BC450), and 550 °C (BC550). BC350 featured inorganic nitrogen, while BC450 and BC550 contained elevated organic nitrogen. Nitrogen, potassium, and dissolved organic carbon were released via a quick surface wash-off process. Polyphosphates prevailed in BC350 and leached through a fast diffusion-controlled process. BC450 and BC550 were dominated by Ca/Mg orthophosphates and released via a slow dissolution-controlled process. Leachates from BC450 and BC550 stimulated the shoot length of wheat seeds. After 5 leaching cycles, there were more aromatic dissolved organics, and BC450 and BC550 exhibited higher abundance of C-N and O-P-O. Overall, pyrolysis of FWD at 450 °C and 550 °C shows potential in producing slow-release biochar fertilizers for resource recycling.

200. 题目: Preparation of highly adsorptive biochar by sequential iron impregnation under refluxing and pyrolysis at low temperature for removal of tetracycline
文章编号: N24040412
期刊: Environmental Pollution
作者: Ahui Sun, Siyao Bian, Linzhou Li, Zijing Guo, Wanjie Li, Jihui Li, Shuying Xu, Pan-Dao Liu
更新时间: 2024-04-04
摘要: Iron-doping modification is a prevailing approach for improving adsorption capability of biochar with environmental friendliness, but usually requires high temperature and suffers from iron aggregation. Herein, a highly adsorptive biochar was manufactured via sequential disperse impregnation of iron by refluxing and pyrolysis at low temperature for eliminating tetracycline (TC) from aqueous solution. Iron oxides and hydroxides were impregnated and stably dispersed on the carbon matrix as pyrolyzed at 200 °C, meanwhile abundant oxygen and nitrogen functional groups were generated on surface. The iron-doped biochar exhibited up to 891.37 mg/g adsorption capacity at pH 5, and could be recycled with high adsorption capability. The adsorption of TC should be mostly contributed to the hydrogen bonding of N/O functional groups and the hydrogen bonding/coordination of iron oxides/hydroxides. This would provide a valuable guide for dispersedly doping iron and conserving functional groups on biochar, and a super iron-doped biochar was prepared with superior recyclability.

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