1. 题目: Insights into the removal of sulfamethazine and sulfonamide-resistant bacteria from wastewater by Fe-Mn spinel oxide modified cow manure biochar activated peroxymonosulfate: A nonradical pathway regulated by enhanced adsorption and 3d orbital electron rec 文章编号: N24100521 期刊: Applied Catalysis B: Environment and Energy 作者: Liuyu Chen, Xuejiang Wang, Meng Yuan, Bing-Jie Ni, Siqing Xia, Jianfu Zhao 更新时间: 2024-10-05 摘要: Effectively regulating nonradical pathways is crucial for adapting to complex water environments in sulfate radical-based advanced oxidation processes (SR-AOPs). This study prepared manganese ferrite-modified cow-manure biochar composites (BC-FM) as peroxymonosulfate activators to remove sulfamethazine (SMT) and sulfonamide-resistant bacteria (SA-ARB) from wastewater. The extensive conjugated graphitic structure in biochar induced Fe 3d orbital electron reconstruction, promoting empty orbitals formation and enhancing peroxymonosulfate inner-sphere complexation. This facilitated 100 % electron-transfer-dominated nonradical regulation. BC-FM exhibited remarkable catalytic performance, with apparent rate constant of 0.170 min−1 for SMT, inactivating ∼8.6 log of SA-ARB, and effectively blocking horizontal transfer of antibiotic resistance genes in both single and complex pollution systems (SMT/SA-ARB). Moreover, ion leaching experiments, cycling tests, real-water experiments, fluidized-bed and fixed-bed experiments demonstrated BC-FM’s potential for prolonged utilization and practical implementation. This study offers new insights into designing high-performance, environment-friendly bimetal catalysts and provides a basis for remediating organic contaminants with SR-AOPs in livestock wastewater.
2. 题目: The influence of Cu2+ and Pb2+ on the characteristics of extracellular polymeric substances (EPSs) from Mucor mucedo and its relationship with pyrene biodegradation 文章编号: N24100520 期刊: Journal of Environmental Chemical Engineering 作者: Chunyun Jia, Xuqin Bai, Shiwei Wang, Yue Ding, Rui Liu, Xiaojun Li 更新时间: 2024-10-05 摘要: The bioremediation of polycyclic aromatic hydrocarbons (PAHs) may be facilitated by the presence of heavy metals (HMs) via extracellular polymeric substances (EPSs). However, the variability of EPS characteristics influenced by HMs in relation to PAHs degradation remains uncertain, particularly in the case of fungi. It is therefore crucial to elucidate the impact of HMs on the characteristics of EPSs and their interaction in the process of PAHs biodegradation. The present study observed the cell membrane of Mucor mucedo under conditions of Cu2+ and Pb2+ stress, as well as determining the characteristics of EPSs. The findings demonstated that the presence of HM ions led to a disruption of the fungal cell membrane. The production of EPSs, the content of their main components and EPS property exhibited changes in accordance with the increasing concentration of HMs. It is noteworthy that the degradation of pyrene was enhanced as the concentration of HMs within the range of 0-80 mg L-1, particularly in the presence of EPSs. A positive correlation was observed between pyrene degradation and the total organic carbon, total nitrogen, polysaccharides, proteins, and surface tension of EPSs. It was thus demonstrated that pyrene biodegradation was enhanced under the stress of HMs (less than 80 mg L-1) by varying the characteristics of EPSs. The conceptual framework outlines the pyrene biodegradation process by EPSs under HM stress. This study provides new insights into the potential mechanism by which HMs influence the biodegradation of PAHs through the involvement of EPSs.
3. 题目: Hydroxyapatite self-doped biochar with MgO modification immobilizes heavy metal and alters soil microbial community 文章编号: N24100519 期刊: Journal of Environmental Chemical Engineering 作者: Shiqi Xiao, Sheng Ding, Wei Gao, Xin Qi 更新时间: 2024-10-05 摘要: Functionalized biochars are highly effective in the remediation of heavy metals and the improvement of soil properties. In this study, we prepared a hydroxyapatite self-doped biochar (FB) using fish scales as raw material, and impreged FB with MgCl2 following by pyrolysis to obtain MgO-loaded FB (MFB). A soil incubation experiment was conducted to explore the influence of MFB on the immobilization of Cu, Cd, and Pb, alongside the impact on the soil properties and bacterial community. The results demonstrated that the nano-hydroxyapatite components and MgO micro-nanoparticles on MFB promoted the immobilization of heavy metals in soils through dissolution-precipitation and ion-exchange. The availability of Cu, Cd, and Pb in soils amended with MFB was significantly decreased by 69.1 %, 63.5 %, and 53.7 %, respectively, compared to CK. Furthermore, the MFB amendment significantly increased soil organic carbon and available P, as well as enhanced enzyme activities related to the C-, N-, and P-cycles. Notably, the MgO loaded on biochar played a crucial role in altering the diversity and composition of soil bacterial communities. The complexity and stability of the co-occurrence networks of bacterial communities increased following MgO-loaded biochar addition, and there were more frequent positive interactions among bacterial taxa within the network. The effects of MFB on immobilizing heavy metals and shaping bacterial communities were conducive to the restoration of soil ecological functions. These findings provide a promising strategy for the remediation of heavy metal contaminated soils.
4. 题目: Molecular characteristics of dissolved organic matter regulate the binding and migration of tungsten in porous media 文章编号: N24100518 期刊: Science of the Total Environment 作者: Weijun Li, Jian Xie, Rui Huang, Wei Chen, Huihui Du 更新时间: 2024-10-05 摘要: Tungsten (W) is an emerging contaminant that poses potential risks to both the environment and human health. While dissolved organic matter (DOM) can significantly influence the W's environmental behavior in natural aquifers, the mechanisms by which DOM's molecular structure and functional group diversity impact W binding and migration remain unclear. This study investigated DOM derived from soil and sediment, fractionated into <1 kDa, 1–100 kDa, and 100 kDa–0.45 μm portions, systematically compared the relationship between DOM molecular characteristics and tungstate (WO42−) binding properties using multiple spectroscopic methods, including FTIR, fluorescence spectroscopy and XPS. The influence of DOM molecular characteristics on WO42− migration in porous media was investigated through quartz sand column experiments. Results revealed that approximately 75 % of W was controlled by DOM, with over 50 % binding to low molecular weight DOM (<1 kDa). Tungsten bound to medium-high molecular weight DOM (1–100 kDa, >100 kDa) showed a greater propensity for retention, with the >100 kDa fractions demonstrating stronger selective binding to W, exhibiting distribution coefficients (Kmd) of 6.11 L/g and 10.69 L/g, respectively. Further analysis indicated that W primarily binds with aromatic rings, phenolic hydroxyls, polysaccharides, and carboxyl groups in DOM, potentially affecting DOM structural stability and consequently influencing W migration characteristics. Free W migration in quartz sand was primarily controlled by Langmuir monolayer adsorption, leading to local enrichment (Da = 6.83, Rd = 86.98). When bound to DOM, W's migration ability significantly increased (Rd = 8–10), with adsorption shifting to a Freundlich multilayer model, primarily controlled by convective transport (Npe = 27–62> > 1.96), while adsorption effects weakened (Da ≈ 1). This study, for the first time, systematically reveals the regulatory mechanisms of DOM molecular characteristics on tungsten's environmental behavior. It offers crucial parameter support for constructing tungsten migration models and provides important guidance for tungsten pollution risk assessment and remediation strategies.
5. 题目: Carbon Sequestration and Soil Fertility Management in Sandy and Clayey Soils Revealed by Over Four Decades of Long-Term Field Experiments in Thailand 文章编号: N24100517 期刊: Land Degradation & Development 作者: Somrutai Tancharoen, Shinya Iwasaki, Takeshi Watanabe, Suphakarn Luanmanee, Wanida Nobuntou, Wanlee Amonpon, Netirat Chumsuwan, Kobkiet Paisancharoen, Saowaree Bumrung, Naruo Matsumoto 更新时间: 2024-10-05 摘要: We investigated the impact of organic matter (OM) application on soil organic carbon (SOC) sequestration and cassava yield in sandy (sand content > 72% and > 62%) and clayey (sand content > 47%) soils through three long-term experiments conducted from 1975 to 1976 in Thailand. Eight treatments—nitrogen (N), phosphorus (P), and potassium (K) fertilization, cassava residue (CR), and compost application (COM)—were assigned to the control (CT), N, NP, NK, NPK, CR, NPK + CR, and NPK + COM groups. Changes in SOC, cassava yield, and soil chemical properties, were recorded. Interactions of these parameters were visualized using structural equation modeling (SEM). SOC concentrations were determined at five different depths in 2021. A significant treatment effect was observed in the initial stage of the experiment in sandy soils. Conversely, in clayey soil, a significant effect was observed only in the later stage. SOC sequestration rates (mean ± SD of the three sites, Mg C ha−1 0.2 m−1) were in the order of NPK + COM (10.1 ± 6.5), NPK + CR (5.6 ± 3.1), CR (2.8 ± 2.0), NPK (2.0 ± 2.1), NK (1.9 ± 1.3), NP (1.8 ± 2.0), and N (1.2 ± 1.1). SEM highlighted the effect of OM application on SOC sequestration across the three sites. Furthermore, SOC increases positively influenced cassava yield in sandy but not in clayey soils. Vertical distribution of SOC showed consistent treatment effects in deeper soil layers, especially in sandy soils, underscoring the importance of considering deep soil layers for carbon sequestration.
6. 题目: Potential of solar photodegradation of antibiotics in shallow ditches: Kinetics, the role of dissolved organic matter and prediction models 文章编号: N24100516 期刊: Science of the Total Environment 作者: Liu Liu, Zhe Sun, Jingjing Feng, Mengkai Li, Weiwei Ben, Zhimin Qiang 更新时间: 2024-10-05 摘要: Shallow ditches, which generally receive livestock or domestic sewage, are widely distributed in rural and suburban areas, making them important sites for antibiotic exposure. Because of the easy penetration of solar irradiation, the photochemical reactions of antibiotics tend to be active in shallow ditches. This study investigated the photodegradation potential of 21 commonly used antibiotics belonging to five categories in a typical shallow ditch by conducting simulated solar irradiation experiments. The influence of dissolved organic matter (DOM) in ditch water on the photodegradation of antibiotics was analyzed, and a model based on DOM changes was established to predict the degradation behavior of antibiotics. The results indicated that the degradation rates of different varieties of antibiotics in ultrapure water and ditch water followed the trend of fluoroquinolones > tetracyclines > sulfonamides > macrolides > lincosamides. In ditch water, direct photodegradation and photooxidation mediated by played predominant roles in the antibiotic photodegradation, whereas the contributions of singlet oxygen () and hydroxyl radicals () vary significantly depending on the reactivity of the antibiotics. A simple and effective model was proposed for predicting the photodegradation process of antibiotics in ditch water based on the degree of DOM photobleaching determined by excitation-emission matrix fluorescence spectroscopy coupled with parallel factor analysis. The prediction model was simplified by considering the similarity in photochemical properties within the same category of antibiotics and was validated by field tests. This study fills a critical research gap by evaluating the photodegradation of antibiotics in shallow ditches, thereby providing valuable insights into their fate and transport in shallow ditch water.
7. 题目: Development, Process Optimization and Assessment of Sustainable Mobile Biochar Kiln for Agricultural Use 文章编号: N24100515 期刊: Journal of Cleaner Production 作者: Maga Ram Patel, Narayan Lal Panwar 更新时间: 2024-10-05 摘要: A novel and energy-efficient biochar kiln that can be operated in the field with few requirements has been developed. The generated syngas are recirculated into the combustion chamber to heat biomass. This study optimized the feedstock parameters, biochar yield, and economics of producing biochar from soybean straw using the Response Surface Methodology (RSM) based on Central Composite Design (CCD). The biochar kilns had an energy conversion efficiency of 47.02% and an overall kiln efficiency of 41.03% at steady-state operation over 500°C. It produced an average of 29.43 ± 1.42% biochar with a minimal fuel-to-biochar ratio of 0.19 ± 0.02 and a payback period of 4.02 months. The statistical analysis confirmed that the characteristics of the feedstock affect the biochar output and economic aspects of the biochar production process. Based on the optimization studies, it was concluded that the feedstock's moisture content should be 8% and particle size should be 15 mm for higher biochar yield with maximum energy efficiency and benefit-cost ratio. Biochar produced at optimal conditions obtained from the optimization process was also characterized. Physical-chemical analysis reveals that biochar has a higher carbon content (79.38 ± 1.04 %) and a lower atomic ratio of H/C (0.696), O/C (0.14), and (N+O)/C (0.08), indicating higher carbon stability and aromaticity. The TGA analysis demonstrated the high thermal stability of biochar by showing a lower (2.15%) mass loss between the 343.8 and 407.1°C temperature range. The SEM and TEM micrographs showed the microporous structure of the soybean straw biochar with a worm-like pattern and a cylindrical shape.
8. 题目: Organic Carbon Reaction Kinetics in Bioturbated Sediments 文章编号: N24100514 期刊: Geophysical Research Letters 作者: Matthias Kuderer, Jack J Middelburg 更新时间: 2024-10-05 摘要: Most organic carbon delivered to the seafloor is degraded within the bioturbated layer. Theory and empirical evidence have shown that organic carbon reactivity relates to the age of a particle. However, due to particle mixing, the age-depth linear relation induced by sediment accretion is obfuscated. Here we combine a Lagrangian particle tracking model that resolves the age distribution of particles in the bioturbated zone and couple it to age-dependent organic carbon degradation. Depth profiles for organic carbon concentration, reactivity and degradation rate are presented for sediments receiving low and high reactivity organic carbon in coastal, continental slope and deep-sea environments. Our results show that a simple first-order kinetics model suffices for well-mixed sediments and systems receiving pre-processed materials. A reactive continuum approach is needed for poorly mixed sediments receiving highly reactive organic carbon and for sediments below the bioturbated layer.
9. 题目: Algal EPS modifies the toxicity potential of the mixture of polystyrene nanoplastics (PSNPs) and triphenyl phosphate in freshwater microalgae Chlorella sp. 文章编号: N24100513 期刊: Chemosphere 作者: Abhrajit Debroy, Janani Srividya Saravanan, M Joyce Nirmala, Mrudula Pulimi, Amitava Mukherjee 更新时间: 2024-10-05 摘要: Triphenyl phosphate (TPP) and polystyrene nanoplastics (PSNPs) are prevalent freshwater contaminants obtained mainly from food packaging, textiles and electronics. Algal extracellular polymeric substances (EPS), a part of natural organic matter, may influence these pollutants' behaviour and toxicity. The presence of EPS can enhance the aggregation of TPP-PSNP mixtures, and reduce the bioavailability, and thus the toxicity potential. Understanding the mutual interactions between TPP, PSNPs, and EPS in the aquatic environment is a prerequisite for the environmental risk assessment of these chemicals. The study examines the toxicity effects of various surface-modified PSNPs (1 mg/L of plain, animated, and carboxylated) and TPP (0.05, 0.5, and 5 mg/L) in pristine and combined forms on freshwater microalgae, Chlorella sp., as a model organism. The physical-chemical interactions of algal EPS (10 mg/L) with PSNPs and TPP and their mixtures were studied. The toxicity potential of the PSNPs was estimated by quantifying growth inhibition, oxidative stress, antioxidant activity, and photosynthesis in the cells. TPP toxicity increased in the presence of the PSNPs, however the addition of algal EPS reduced the combined toxic effects. EPS plays a protective role by reducing oxidative stress and enhancing photosynthetic efficiency in the algal cells. The Pearson modeling analysis indicated a positive correlation between growth inhibition, and reactive oxygen species, malondialdehyde production. The cluster heatmap and correlation mapping revealed a strong correlation among the oxidative stress, growth inhibition, and photosynthetic parameters. The study clearly highlights the potential of EPS in mitigating the risk of mixed emerging pollutants in the aquatic environment.
10. 题目: Engineered biochar for advanced oxidation process towards tetracycline degradation: Role of iron and graphitic structure 文章编号: N24100512 期刊: Journal of Environmental Chemical Engineering 作者: Zhengshuai Sun, Qi Wei, Wenbin Hua, Meijing Chen, Qiaoxia Yuan, Baojun Yi, Yong Sik Ok 更新时间: 2024-10-05 摘要: The excessive accumulation of tetracycline (TC) presents significant challenges to both human health and the ecological environment. This study explores the impact of Fe-loaded sawdust graphitic carbon (engineered biochar) on TC degradation in water, utilizing an advanced oxidation process facilitated by H2O2 activation. The investigation encompasses an examination of the structural characteristics of Fe-loaded sawdust graphitic carbon and an in-depth analysis of its catalytic degradation mechanism concerning TC. Density functional theory (DFT) was utilized to construct an adsorptive degradation system for TC in water, thereby scrutinizing the optimal treatment process for TC. The findings highlight that Fe-loaded biochar exhibits not only a substantial pore structure but also inherent defects and a graphitic structure. The porous configuration enhances the TC adsorption capacity of the biochar system, while the graphitic structure bolsters the stability of the carbon framework, ensuring efficient charge transfer via the carbon defects. The activation effect of Fe(III) on H2O2 into ·O2- is dependent on its specific location within the carbon structure. In the presence of 5 mmol H2O2, Fe-loaded biochar achieves a nearly 100 % degradation rate of TC, with its degradation proficiency minimally influenced by varying pH conditions.
11. 题目: Sunlight-Driven Direct/Mediated Electron Transfer for Cr(VI) Reductive Sequestration on Dissolved Black Carbon–Ferrihydrite Coprecipitates 文章编号: N24100511 期刊: Environmental Science & Technology 作者: Leiye Sun, Tianming Wang, Bo Li, Meiqing Chen, Jiayan Wu, Zhongbo Shang, Pingxiao Wu, Zhi Dang, Nengwu Zhu 更新时间: 2024-10-05 摘要: Surface runoff horizontally distributed chromium (Cr) pollution into various surface environments. Sunlight is a vital factor for the Cr cycle in the surface environment, which may be affected by photoactive substances such as ferrihydrite (Fh) and dissolved black carbon (DBC). Herein, sunlight-driven transformation dynamics of Cr species on DBC–Fh coprecipitates were studied. Under sunlight, the removal of aqueous Cr(VI) by DBC–Fh coprecipitates occurred through sunlight-driven reductive sequestration including adsorption, followed by surface reduction (pathway 1) and aqueous reduction, followed by precipitation (pathway 2). Additionally, coprecipitates with a higher DBC content exhibited a more effective reduction of both adsorbed (kapp,S_red) and aqueous Cr(VI) (kapp,A_red). Photoelectrons facilitated Cr(VI) reduction through direct electron transfer; notably, electron donating DBC promoted the production of photoelectrons by consuming photogenerated holes. Photogenerated Fe(II) species (mineral-phase and aqueous Fe(II)) mediated electron transfer for Cr(VI) reduction, which was reinforced via a ligand-to-metal charge transfer (LMCT) process between DBC–organic ligands and mineral Fe(III). Furthermore, ·O2– also mediated Cr(VI) reduction, although this impact was limited. Overall, this study demonstrates that photoelectrons and photogenerated electron mediators play a crucial role in Cr(VI) reductive sequestration on DBC–Fh coprecipitates, providing new insights into the geochemical cycle of Cr pollution in sunlight-influenced surface environments.
12. 题目: Salinity increases under sea level rise strengthens the chemical protection of SOC in subtropical tidal marshes 文章编号: N24100510 期刊: Science of the Total Environment 作者: Hongda Xu, Chun Wang, Maoquan Ge, Jordi Sardans, Josep Peñuelas, Chuan Tong, Weiqi Wang 更新时间: 2024-10-05 摘要: The rise in sea levels due to global warming could significantly impact the soil organic carbon (SOC) pool in coastal tidal marshes by altering soil salinity and flooding conditions. However, the effects of these factors on SOC protection in coastal tidal marshes are not fully understood. In this study, we employed a space-for-time approach to investigate the variations in soil active carbon components and mineral-associated organic carbon under different salinity gradients (freshwater and brackish) and flooding frequencies (high and low tidal flats).The soil organic carbon (SOC) and easily oxidizable organic carbon (EOC) contents at the low-flooding frequency sites were higher than those at the high-flooding frequency sites. The dissolved organic carbon (DOC) content was higher at the high-salinity sites compared to the low-salinity sites, while the soil microbial biomass carbon (MBC) content was higher at the low-salinity sites than at the high-salinity sites. The EOC/SOC and DOC/SOC ratios were greater at the high-salinity sites than at the low-salinity sites, whereas the MBC/SOC ratios were higher at the low-salinity sites than at the high-salinity sites. Iron (Fe) and aluminum (Al) mineral-associated organic carbon [Fe(Al)-OC] and calcium-associated organic carbon (Ca-OC) contents were higher at the high-salinity sites compared to the low-salinity sites, and at the low-flooding frequency sites compared to the high-flooding frequency sites.Meanwhile, Fe(Al)-OC was the dominant fraction among mineral-associated organic carbon at all sites. The dominant phyla of bacterial community included Proteobacteria (49.31 %–66.36 %), Firmicutes (2.67 %–28.44 %), Chloroflexi (3.81 %–9.54 %), and Acidobacteria (4.28 %–7.02 %). In addition, Desulfobacca, a sulfate-reducing bacterium, promoted the formation of mineral-associated organic carbon.Random forest analysis showed that SOC and DOC were key factors in promoting mineral-associated organic carbon formation. Partial least squares path modeling (PLS-PM) indicated that sea level rise affects DOC content by altering soil physicochemical properties, promoting the formation of mineral-associated organic carbon.In summary, while soil organic carbon activity increases, the chemical association of minerals with organic carbon is becoming increasingly crucial for the protection of organic carbon under rising salinity conditions driven by sea level rise.
13. 题目: Insight into the mechanism of lignin amination pretreatment on lignin structure and its pyrolysis property for lignin valorization 文章编号: N24100509 期刊: Chemical Engineering Journal 作者: Zihao Liu, Jiawen Zeng, Zhiguo Dong, Yingquan Chen, Haiping Yang, Hanping Chen 更新时间: 2024-10-05 摘要: Lignin modification followed by pyrolysis is an attractive way for its high-value conversion, in which lignin amination has emerged as a prospective method to further valorize lignin during pyrolysis. To uncover the influence of amination on the lignin pyrolysis mechanism, the amination of alkali lignin was investigated using ethylenediamine and formaldehyde, and the pyrolysis behavior and the formation of lignin derivatives were explored in detail. Results showed that amination led to the formation of C-N structure, and substitution of Na+ (to form C-N+) in lignin simultaneously, reaching the maximum nitrogen content of 5.81 wt%. This resulted in decreased activation energy with more weight loss (50.4 wt%) during pyrolysis. For pyrolysis products, more nitrogen-containing products and higher proportion of lignin derivatives with C3 side chains (14.2–17.7 %) were formed. Also, effective nitrogen doping of lignin-based biochar (1.27–3.95 wt%) was achieved. Furthermore, the increasing amination degree of lignin increased the pyridinic nitrogen content in biochar from 9.4 % to 35.7 %, and also resulted in smaller graphite structures & more defect structures. Overall, the study provides insight into the change of aminated lignin structure and its pyrolysis behavior, demonstrating a prospective approach for the high-value utilization of alkali lignin.
14. 题目: Spatiotemporal coupling dynamics and factors influencing soil organic carbon and crop yield in Chinese farmlands 文章编号: N24100508 期刊: Science of the Total Environment 作者: Wang Liangfen, Zhang Shuhe, Wang Liangjian, Xi Xie 更新时间: 2024-10-05 摘要: Clarifying the correlation between soil organic carbon (SOC) and crop yield is key to achieving carbon neutrality and ensuring food security. However, owing to the lack of analysis based on large-scale farmland monitoring data and research on deep soil, relevant research has not yet reached a consensus. Here, we based on the monitoring data of 118 sample plots from 21 typical farmland and farmland compound ecosystem stations of the China Ecosystem Research Network (CERN) between 2004 and 2020, the temporal and spatial coupling associations between SOC content and crop yield in 0–20 cm and 0–100 cm soil layers and its factors influencing were determined. The findings revealed that between 2004 and 2020, SOC content in 0–20 cm soil layer, SOC content in 0–100 cm soil layer, and crop yield in typical farmland in China showed a fluctuating upward trend, the average annual growth rates were 0.59 %, 0.27 % and 1.07 %, respectively. The coupling relationship between SOC content and crop yield was not always good in different periods, which varies largely in different geographical divisions. Among the anthropogenic factors, exogenous carbon input can improve the coupling relationship between them by increasing the soil organic carbon content and crop yield, while the effect of less tillage and no tillage is limited. Among the natural factors, temperature, soil bulk density, and farmland type all have an impact on farmland SOC content and crop yield at different significance levels. Each variable have different effects on SOC content and crop yield in typical farmlands in different geographical regions. With deepening soil layer, influence of anthropogenic factors such as exogenous carbon input on SOC content decreases, but it still cannot be ignored. Based on these findings, the study recommends that exogenous carbon input play an important role in soil carbon sequestration and improving crop yield.
15. 题目: Integration of Fe-MOF-laccase-magnetic biochar: From Rational Designing of a biocatalyst to aflatoxin B1 decontamination of peanut oil 文章编号: N24100507 期刊: Chemosphere 作者: Usman Rasheed, Qurat Ul Ain, Bin Liu 更新时间: 2024-10-05 摘要: Enzymatic degradation of aflatoxins in food commodities has gained significant attention. However, enzyme denaturation in organic media discourages their direct use in oils to remove aflatoxins. For that, enzymes are immobilized or encapsulated for improved stability and reusability under unfavorable conditions. We sandwiched the laccase between a carrier and an outer protective layer. We used spent-mushroom-substrate (SMS) derived porous magnetic biochar as the laccase carrier and coated it with an iron MOF to create a biocomposite, Fe-BTC@Lac@FB. The immobilized laccase demonstrated enhanced chemical, thermal, and storage stability and proficient reusability. Fe-BTC@Lac@FB exhibited 11 times enhanced aflatoxin B1 (AFB1) degradation compared to free laccase (FL). In addition, thermally inactivated Fe-BTC@Lac@FB could adsorb 11.2 mg/g of AFB1 from peanut oil. Multi-aflatoxin removal also proved promising, while Fe-BTC@Lac@FB could retain > 85 % of AFB1 removal efficacy after five reusability cycles. Fe-BTC@Lac@FB treatment did not affect peanut oil quality as indicated by different oil quality parameters and proved essentially non-cytotoxic. All these aspects helped recognize Fe-BTC@Lac@FB as an excellent laccase-carrying material with exceptionally higher stability, activity, and reusability.
16. 题目: Impact of water depth and flow velocity on organic matter removal and nitrogen cycling in floating constructed wetlands 文章编号: N24100506 期刊: Science of the Total Environment 作者: Baoshan Shi, Xiangju Cheng, Junheng Pan, Shenqiong Jiang, Yongde Kang, Longwei Wang, Jun Xie 更新时间: 2024-10-05 摘要: The configuration of water depth (WD) and flow velocity (FV) in floating constructed wetlands (FCWs) reflects the complex interactions between hydraulic conditions and wastewater treatment performance. Properly configuring hydraulic conditions can optimize performance. This study explored the removal and degradation of organic matter and nitrogen (N) in FCWs with three different WDs (50 cm (SD), 70 cm (MD), and 95 cm (DD)) under four FV conditions (0, 0.3, 1.0, and 1.5 m/d). It also analyzed the regulatory effects of hydraulic conditions on microbial community structure to provide new insights for configuring hydraulic conditions in FCWs. The results indicate that variations in WD and FV do not significantly affect COD removal (p > 0.05), with removal efficiency (RE) consistently reaching 90 % across all conditions. However, hydraulic conditions do influence the degradation rate (k) of COD, with increased FV enhancing the k in MD and DD. In contrast, WD significantly impacts the removal of NH4+-N (p < 0.05), with RE in SD exceeding 80 % across all four FVs. The primary reason is that increased WD reduced the abundance of nitrifying bacteria (Nitrosomonas and Nitrospira) and functional genes (hao and pmoABC-amoABC). Meanwhile, increased WD and FV significantly enriched the denitrifying bacteria genera (such as Massilia, Bacillus, Ensifer, and Rhodobacter) and certain functional genes (nap and nir), favoring the denitrification process and enhancing the dissimilatory nitrate reduction to ammonium (DNRA) process. Furthermore, microbial community diversity, richness, and the number of operational taxonomic units (OTUs) were highest in SD, but decreased with increased WD. This is mainly related to changes in oxygen (O2) transmission and nutrient concentration. These findings help us understand the mechanisms by which hydraulic regulation affects the removal of organic matter and N in FCWs. They also propose potential solutions from a hydraulics perspective to enhance N removal.
17. 题目: Aging of biodegradable microplastics and their effect on soil properties: Control from soil water 文章编号: N24100505 期刊: Journal of Hazardous Materials 作者: Kailin Gong, Cheng Peng, Shuangqing Hu, Wenwen Xie, Anqi Chen, Tianzi Liu, Wei Zhang 更新时间: 2024-10-05 摘要: The ecological risks of biodegradable microplastics (BMPs) to soil ecosystems have received increasing attention. This study investigates the impacts of polylactic acid microplastics (PLA-MPs) and polybutylene adipate terephthalate microplastics (PBAT-MPs) on soil properties of black soil (BS) and fluvo-aquic soil (FS) under three water conditions including dry (Dry), flooded (FL), and alternate wetting and drying (AWD). The results show that BMPs exhibited more evident aging under Dry and AWD conditions compared to FL condition. However, BMPs aging under FL condition induced more substantial changes in soil properties, especially dissolved organic carbon (DOC) concentrations, than under Dry and AWD conditions. BMPs also increased the humification degree of soil dissolved organic matter (DOM), particularly in BS. Metagenomic analysis of PBAT-MPs treatments showed different changes in microbial community structure depending on soil moisture. Under Dry conditions, PBAT-MPs enhance the ammonium-producing process of soil microbial communities. Genes related to N nitrification and benzene degradation were enriched under AWD conditions. In contrast, PBAT-MPs do not change the abundance of genes related to the N cycle under FL conditions but significantly reduce genes related to benzene degradation. This reduction in benzene degradation genes under FL condition might potentially slow down the degradation of PBAT-MPs, and could lead to temporary accumulation of benzene-related intermediates. These findings highlight the complex interactions between BMPs, soil properties, and microbial communities, emphasizing the need for comprehensive evaluations of BMPs’ environmental impacts under varying soil water conditions.
18. 题目: Biochar rich in amino ligand for copper selective recollection in wastewater 文章编号: N24100504 期刊: Separation and Purification Technology 作者: Shi-Kai Li, Yu-Jiao Wen, Yi-Fan Wang, Meng Liu, Zheng-jie Peng, Le-zhu Su, Zhi Zhou, Nan Zhou 更新时间: 2024-10-05 摘要: The coexistence with other similar valence counterparts greatly hinders the selective recovery of metals, resulting in serious resource waste and environmental pollution. Herein, biochar with numerous surface –NO2 and –COOH groups was prepared, and in-situ ammonization reaction was catalyzed by electricity to transform those attached –NO2 into –NH2. The as-obtained biochar with stable ligand of –NH2 (BC-NH2) exhibited an excellent selective adsorption efficiency for copper. Among six bi-valence ions of copper, lead, cadmium, zinc, magnesium and calcium, the above adsorbent could selective recollect 88.76 % and 73.61 % of copper from aqueous and soil respectively. More importantly, the other existent bi-valence ions can be effectively substituted by Cu(II) with a high efficiency up to 91.92 %, even they were saturated on the BC-NH2. The Linear sweep voltammetry curves (LSV) and density functional theory (DFT) demonstrate the strongest affinity between Cu(II) and BC-NH2 than that of other heavy metals, indicating the keynote of the selective mechanism should be the formation of ultra-stable complex between –NH2 and copper ions. Besides, –COOH group participate the pathway for the transformation from –NO2 to –NH2. This study provides a new concept, and an ideal material as well as novel preparing stratagem, for selective recollecting copper through chelating.
19. 题目: Rhizosphere priming and effects on mobilization and immobilization of multiple soil nutrients 文章编号: N24100503 期刊: Soil Biology and Biochemistry 作者: Jiayu Lu, Jiangping Cai, Feike A Dijkstra, Liming Yin, Peng Wang, Weixin Cheng 更新时间: 2024-10-05 摘要: Living roots and their rhizodeposition play a vital role in mediating soil organic carbon (SOC) decomposition and nutrient mobilization. It is virtually unknown how the rhizosphere effects on soil nutrient mobilization are connected with the rhizosphere priming on SOC decomposition. Here we investigated the rhizosphere effects of six grassland species (four grasses and two legumes) on soil nutrient mobilization and SOC decomposition with and without nitrogen (N) fertilization in a 95-day pot experiment. Plant nutrient acquisition, soil extractable nutrients, and net nutrient mobilization or immobilization were determined to evaluate the rhizosphere effect on soil nutrient dynamics. Primed SOC decomposition was measured as the difference in soil-derived CO2-C between planted and unplanted treatments. Without N fertilization, all species consistently increased net phosphorus (P), sodium (Na), iron (Fe), and copper (Cu) mobilization and most species increased net N, sulfur (S), calcium (Ca), and zinc (Zn) mobilization and net potassium (K), magnesium (Mg), and manganese (Mn) immobilization compared to the unplanted soil. These results suggest that grassland species could induce both positive and negative rhizosphere effects on soil nutrient mobilization with different magnitude. With N fertilization, plant-induced net N mobilization increased, while plant-induced net P and S mobilization decreased. Further, plant biomass, plant N, P, and S acquisition, and plant-induced net N, P, and S mobilization (i.e., net nutrient mobilization in excess of the unplanted control), were positively correlated with primed SOC decomposition across six species, indicating that the mobilization of organically bound nutrients (N, P, and S) was connected with the rhizosphere priming on SOC decomposition. In contrast, plant-induced net nutrient mobilization of base cations and micronutrients was not related to primed SOC decomposition. Overall, our results demonstrate that a substantial portion of nutrient availability stems from rhizosphere processes and is plant species-specific, and that nutrient release of N, P and S are closely connected with rhizosphere priming on SOC decomposition.
20. 题目: Boosting advanced oxidation processes by biochar-based catalysts to mitigate pesticides and their metabolites in water treatment: a meta-analysis 文章编号: N24100502 期刊: Journal of Environmental Chemical Engineering 作者: Jelena Molnar Jazić, Arthur Gross, Bruno Glaser, Jasmina Agbaba, Tajana Simetić, Jasmina Nikić, Snežana Maletić 更新时间: 2024-10-05 摘要: In order to boost the performance of water treatment in removing organic micropollutants, biochar as an environmental-friendly and sustainable carbonaceous material has been increasingly utilized as a catalyst in advanced oxidation processes (AOP). The main idea behind this research was to unlock the potential of biochar-based catalysts as (i) persulfates and periodate activators and (ii) photocatalyst for mitigating pesticide and intermediate compounds in water treatment. The conducted meta-analysis provides for the first time objective and quantitative overview of the current state of research on biochar-based catalysts application in AOP, surpassing the limitations of conventional qualitative reviews. This paper systematically evaluates the influence of different factors on the weighted degradation efficacy (WDE) achieved by both studied groups of AOP, based on the data extracted from 38 studies conducted in the period 2016-2023. The most of meta-analyzed studies (74%) were published during 2021-2023 covering EU Water Framework Directive priority substances and emerging contaminants. The meta-analysis revealed the high heterogeneity within the results of certain groups (p=0.05), indicating the statistically significant influence of the biochar-based catalyst properties, target compound characteristics, pH and water matrix on WDE. The most effective pesticides/intermediate compounds degradation enabled systems containing metal and heteroatom co-doped biochar (e.g. FeS@BC/PMS, S-nZVI@BC/PS) or multicomponent heterojunction (95-99% WDE with 95% confidence interval), and decreased under alkaline conditions and in wastewater. The outstanding catalytic performance of biochar application has been confirmed within the pH 5-8 range, demonstrating significant potential in AOP water treatment.
