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281. 题目: Long-term rice-crayfish farming alters soil dissolved organic carbon quality and biodegradability by regulating microbial metabolism and iron oxidation. 文章编号: N24100802 期刊: Journal of Environmental Management 作者: Wanyang Zhang, Tianqiao Ma, Jianwei Lu, Jun Zhu, Tao Ren, Rihuan Cong, Zhifeng Lu, Yangyang Zhang, Xiaokun Li 更新时间: 2024-10-08 摘要: The biodegradability of dissolved organic carbon (DOC) is a crucial process in the migration and transformation of soil organic carbon (SOC), and play a vital role in the global soil carbon (C) cycle. Although the significance of DOC in SOC transportation and microbial utilization is widely acknowledged, the impact of long-term rice-crayfish (RC) farming on the content, quality, and biodegradability of DOC in paddy soils, as well as regulatory mechanisms involved, remains unclear. To address this gap, a space-for-time method was employed to investigate the effects of different RC farming durations (1-, 5-, 10-, 15-, and 20- years) on the quality and biodegradability of DOC, as well as their relationship with soil microbial metabolism and minerals in this study. The results revealed that continuous RC farming increased the soil DOC content, but reduced DOC biodegradability. Specifically, after 20 years of continuous RC farming, the DOC content increased by 52.7% compared to the initial year, whereas the DOC biodegradability decreased by 63.4%. Analysis using three-dimensional fluorescence and ultraviolet spectroscopy demonstrated that continuous RC farming resulted in a decrease in the relative abundance of humus-like fractions, humification, and aromaticity indexes in DOC, but increased the relative abundance of protein-like fractions, biological, and fluorescence index, indicating that long-term RC farming promoted the simple depolymerization of the molecular structure of DOC. Continuous RC farming increased the activity of hydrolase involved in soil nitrogen (N) and phosphorus (P) cycles and oxidase, but decreasing the hydrolase C/N and C/P acquisition ratios; moreover, it also stimulated an increase in soil iron oxides and exchangeable calcium content. Structural equation modeling suggests that soil hydrolases and iron oxides are the primary drivers of DOC quality change, with DOC biodegradability being driven solely by soil iron oxides and not regulated by DOC quality. In conclusion, long-term RC farming promotes the catalytic decomposition of DOC aromatic substances and the production of DOC protein-like components by increasing soil oxidase activity and decreasing the hydrolase C/N acquisition ratio; these processes collectively contribute to the simple depolymerization of DOC molecular structure. Additionally, long-term RC farming induced legacy effects of soil iron oxides and enhanced chemical protection role leading to reduced DOC biodegradability. These findings suggested that long-term RC farming may reduce the rapid turnover and loss of DOC, providing a negative feedback on climate warming. |
282. 题目: Soil carbon pools and microbial network stability depletion associated with wetland conversion into aquaculture ponds in Southeast China 文章编号: N24100801 期刊: Science of the Total Environment 作者: Ning Hou, Qingsong Zeng, Weiqi Wang, Yi Zheng, Jordi Sardans, Katherine Xue, Fanjiang Zeng, Akash Tariq, Josep Peñuelas 更新时间: 2024-10-08 摘要: Wetlands, which are ecosystems with the highest soil surface carbon density, have been severely degraded and replaced by artificial reclamation for fish and shrimp ponds in recent years. This transformation is causing intricate shifts in soil carbon pools and microbial stability. In this study, we examined natural wetlands and reclaimed aquaculture ponds in Southeast China to analyze the structure and network stability of soil microbial communities following the reclamation of estuarine wetlands and to elucidate the microbial-mediated mechanisms for regulating soil organic carbon (SOC). The aquaculture ponds presented significantly less average SOC content than the natural wetlands (p < 0.05). ACE, Chao1, and Shannon's indices of bacteria and fungi were decreased in aquaculture ponds. Less numbers of nodes and edge links in the co-occurrence network of soil fungi and bacteria in aquaculture ponds. This suggests reduced correlation and stability within the microbial network of aquaculture ponds. Decomposers in soil fungi (e.g. Dung Saprotroph) reduced. Reduced proportions of key phyla Ascomycota, Basidiomycota and Rozellomycota in the soil fungal network. Reduced proportions of key phyla Proteobacteria, Chloroflexi and Desulfobacterota in the soil bacterial network. In conclusion, our results suggest that converting wetland paddocks to intensive aquaculture ponds results in carbon pool loss and reduces soil microbial network stability. The results highlight the importance of protecting or moderately restoring mangrove wetlands along the coast of southeastern China. It is also predicted that such measures may enhance the storage capacity of soil carbon pools and improve the stability of carbon sequestration by soil microorganisms, thus offering a potential solution for mitigating global climate change. |
283. 题目: Dynamic changes, cycling and downward fate of dissolved carbon and nitrogen photosynthetically-derived from glaciers in Upper Indus River Basin 文章编号: N24100616 期刊: Environmental Research 作者: Mohd Aadil Bhat, Si-Liang Li, Cong-Qiang Liu, Nicola Senesi, Giorgio S Senesi, Davide Vione, Daidu Fan, Jie Yuan, Mashura Shammi, Khan M G Mostofa 更新时间: 2024-10-06 摘要: Glaciers play key roles in capturing, storing, and transforming global carbon and nitrogen, thereby contributing markedly to their cycles. However, an integrated mechanistic approach is still lacking regarding glacier's primary producers (PP), in terms of stable dissolved inorganic carbon isotope (δ13C-DIC) and its relationship with dissolved carbon and nitrogen transformation dynamic changes/cycling. Here, we sampled waters from glaciers, streams, tributaries, and the Indus River (IR) mainstream in the Upper IR Basin, Western Himalaya. Dissolved organic matter (DOM) appears to increase, on average, by ∼2.5-23.4% with fluctuations when passing from glaciers to streams-tributaries-IR mainstream (the upper and lower parts, respectively) continuum, implying that DOM originates from glaciers PP and is subsequently degraded. The corresponding fluctuations are observed for fluorescent DOM (FDOM), dissolved organic nitrogen (8.0‒106.8%), NO3‒-N (‒13.5/+16.6%), NH4+-N (‒8.8/+13.0%), and NO2‒-N (70.7-217.5%). These variations are associated with overall DOM/FDOM transformations, with the production of ending byproducts (e.g. CO2/DIC). The δ13C-DIC values fluctuated from glaciers (−5.3±2.5‰) to streams (−4.4±2.1‰), tributaries (−4.3±1.6‰), and IR mainstream (−4.2±1.3‰). The δ13C-DIC data are consistent with C transformations that involve lighter CO2 emission into the atmosphere, whereas highly depleted DIC/CO2 is the signature of DOM degradation after its fresh production from glaciers PP which originated by photosynthetic activities (e.g. uptake/sink of atmospheric CO2: ‒8.4‰). Finally, glacier-fed meltwaters would simultaneously contribute to the biogeochemical characteristics of downward margins and specific ecosystems (lake/pond/groundwater/hot springs) via transformation dynamics/cycling of dissolved C and N with high photo/microbial lability. Our results highlight the substantial contribution of western Himalayan glaciers-derived DOM to the global C and N cycles. |
284. 题目: Impact of Dissolved Organic Matter characteristics and inorganic species on the stability and removal by coagulation of nanoplastics in aqueous media 文章编号: N24100615 期刊: Chemosphere 作者: Tong Liu, Yutong Zhang, Leo Gutierrez, Zheng Xing, Marc Benedetti, Jean-Philippe Croué 更新时间: 2024-10-06 摘要: The aggregation of rough, raspberry-type polystyrene nanoparticles (PS-NPs) was investigated in the presence of six hydrophobic and hydrophilic dissolved organic matter (DOM) isolates and biopolymers (effluent OM) in NaCl and CaCl2 solutions using time-resolved dynamic light scattering. Results showed that the stability of PS-NPs mainly depends on OM characteristics and ionic composition. Due to cation bridging, the aggregation rate of PS-NPs in Ca2+-containing solutions was significantly higher than at similar Na+-ionic strength. Biopolymers rich in protein and carbohydrate moieties showed higher affinity to the surface of PS-NPs than the other DOM isolates in the absence of both Ca2+ and Na+. Overall, the stability of PS-NPs followed the order of biopolymers > hydrophobic isolates > hydrophilic isolates in the presence of Na+ and biopolymers > hydrophilic isolates > hydrophobic isolates in Ca2+-containing solutions. In the presence of high MW structures (biopolymers), PS-NPs aggregation in both NaCl and CaCl2 solutions was attributed to steric repulsive forces. The impact of hydrophilic and hydrophobic isolates on PS-NPs aggregation highly relied on the ionic composition. Coagulation was an effective pretreatment for PS-NPs removal. Using inductively coupled plasma-mass spectrometry, higher removals were recorded with Al2(SO4)3 in the absence of DOM, while PACl more efficiently coagulated PS-NPs in the presence of DOM isolates. |
285. 题目: A new approach for endowing photocatalytic performance to biochar based on peryleneimide: Emphasizing the achievement of highly efficient degradation to RhB. 文章编号: N24100614 期刊: Journal of Environmental Management 作者: Xuya Jiang, Jianbiao Liu, Xiangsheng Han, Fang Wang, Yongxi Li, Feiyu Wang, Weiming Yi 更新时间: 2024-10-06 摘要: Having unique structural characteristics of biochar contributes great potential in photocatalysis, the preparation process complexity is still a great challenge for biochar-based photocatalysts. Based on this, this study proposes a new, simple, efficient, and flexible approach to preparing biochar-based photocatalysts by perylene diimide (GPC/PDI). The results showed that the hybridization between GPC and PDI was achieved by π-π stacking, which was reduced with increasing pyrolysis temperature, increased first and then decreased with increasing PDI content, and improved with enhanced solvent polarity. When the pyrolysis temperature was 400 °C, the PDI addition was 0.05 mg, and the reaction solvent was water, the degradation of 200 mg/L rhodamine B (RhB) by GPC400/PDI0.5 was 94%, and the reaction rate constant was 10 and 4 times higher than GPC400 and PDI, which were also effective in simulating actual wastewater treatment. This was attributed to the efficient electron-hole separation and migration along the π-π stacking direction due to the hybridization of GPC and PDI, which in turn reacts to produce reactive oxygen species (1O2, •O2-, •OH), facilitating the photocatalytic degradation process. |
286. 题目: Plant organ rather than cover crop species determines residue incorporation into SOC pools 文章编号: N24100613 期刊: Soil Biology and Biochemistry 作者: Tine Engedal, Veronika Hansen, Jim Rasmussen, Jakob Magid, Carsten W Mueller, Sune Tjalfe Thomsen, Helle Sørensen, Lars Stoumann Jensen 更新时间: 2024-10-06 摘要: The implementation of cover crops has emerged as a promising approach to improve soil organic carbon (SOC) stocks, with particular emphasis on the perceived higher carbon use efficiency displayed by high-quality residues such as from leguminous plants. In this study, we explored how different cover crop residues, specifically from a legume and a grass cover crop, affects SOC formation and its distribution across various soil carbon pools. Over a 7-month period, we incubated 14C-labeled winter rye and hairy vetch residues in microcosms containing soils of varying soil fertility levels from a long-term field trial. We tracked the fate of carbon into free and occluded particulate organic matter (fPOM, oPOM), mineral-associated organic matter (MAOM), and carbon deposited outside the detritusphere.Despite notable differences in C:N ratio, chemical composition, and turnover rate, similar SOC formation efficiency between vetch and rye within each plant organ (shoots and roots) was observed. Interestingly, the plant organ appeared to exert a greater influence on the fate of cover crop carbon than whether the crop was leguminous or non-leguminous. This phenomenon seemed to be closely related to the lignin content.At medium soil fertility, we found that the largest proportion of cover crop residue C remained as MAOM (20% for shoots, 15-18% for roots), followed by fPOM (5-6% for shoots, 10-12% for roots) and oPOM (2.7-3.0% for shoots, 1.5-1.6% for roots). Notably, fPOM and oPOM exhibited opposite responses to residue quality, indicating functional distinctions between these often-pooled POM pools.Soil fertility exerted minimal influence on overall respiration rate patterns or SOC formation, although it did affect oPOM formation efficiency, likely due to differences in soil aggregation.In conclusion, our findings challenge the assumption regarding the superiority of N rich leguminous cover crop residues for enhancing SOC accrual in C pools believed to have longer persistence. |
287. 题目: The interaction between organic acids and green rust-Co(II): Mineralogical changes of green rust and redistribution of Co(II) 文章编号: N24100612 期刊: Environmental Pollution 作者: Siyi Pan, Pingxiao Wu, Leiye Sun, Meiqing Chen, Bo Li, Tianming Wang, Zhongbo Shang, Jiangmin Fang, Nengwu Zhu, Zhi Dang 更新时间: 2024-10-06 摘要: Green rust (GR), as a vital intermediate product during the formation of various iron oxides, exists with organic matters and metals contaminants in natural environments. Understanding the effects of these natural factors on the transformation process of GR into iron oxides and the environmental behaviors of heavy metals and organic matters during process are critical for environmental quality management, but the fundamental identification of the interaction mechanisms between them and GR is still challenging. In this study, the transformation mechanisms of Co-bearing green rust (GR-Co) synthesized by co-precipitation, and the redistribution behaviors of Co(II) in an environment containing oxalic acid (OA) and citric acid (CA) were clarified. The findings indicated that OA promoted the Fe(II) dissolution and the transformation of GR-Co to goethite, while CA decreased the Fe(II) dissolution and the proportion of non-extractable Co. Furthermore, in the presence of CA, the transformation products of GR-Co were ferrihydrite, magnetite, lepidocrocite and goethite instead of only lepidocrocite and goethite. Meanwhile, CA prohibited ferrihydrite from transforming into more highly crystalline iron minerals. The finding of this study improves the understanding of the interaction mechanisms between GR-Co and organic matter, and the environmental geochemical behaviors of Co and organic carbon during the transformation processes in nature. |
288. 题目: Manuscript for: Journal of Environmental Chemical Engineering New insights into the influence of ultrafiltration pretreatment on reverse osmosis membrane fouling during urban sewage reclamation: Interaction between extracellular polymeric substances and i 文章编号: N24100611 期刊: Journal of Environmental Chemical Engineering 作者: Jiayu Tian, Pengsheng Bu, Shanshan Gao, Mingyue Geng 更新时间: 2024-10-06 摘要: Ultrafiltration (UF) has been frequently employed as pretreatment to mitigate reverse osmosis (RO) membrane fouling. The organic and inorganic substances outflowing from UF pretreatment collectively determine the subsequent RO membrane fouling behavior. However, most of the previous studies were focused on single organic compounds as well as CaSO4 scaling, yet complex organic matter such as extracellular polymeric substances (EPS) and various inorganic scaling (i.e. CaCO3, Ca3(PO4)2) coexisted during urban sewage reclamation. In this study, the impact of UF pretreatment on RO membrane fouling behavior, especially the interaction between EPS and CaCO3/Ca3(PO4)2 scaling, were systematically investigated. Results showed that the presence of UF significantly reduced the normalized flux decline (9.3% vs. 14.3%) and enhanced cleaning recovery efficiency (84.6% vs. 51.6%) of RO membrane, but increased scattered crystals (CaCO3 and Ca3(PO4)2) formation on RO membrane surface. Further investigation showed that the binding energy of the Ca2p1/2 and Ca2p3/2 peaks on fouled RO membrane exhibited a shift towards lower energy, which indicated a weak complexation between EPS and Ca2+, thereby increasing inorganic scaling and confirming the two-sides role of EPS retained by UF in RO membrane fouling. Moreover, static experiments indicated that EPS inhibited CaCO3 scaling rather than Ca3(PO4)2 scaling with the inhibition rates of 7.3% and 0.7%, respectively. To the best of our knowledge, it is the first to reveal the different effect of EPS on CaCO3 and Ca3(PO4)2 scaling. The results may provide a new insight into the effect of UF pretreatment on RO membrane fouling during urban sewage reclamation process. |
289. 题目: Constructing SDBS-intercalated MoS2 nanosheets confined and near-vertically grown on network biochar adsorbent: Insights into highly efficient co-adsorption of ciprofloxacin and lead ions 文章编号: N24100610 期刊: Chemical Engineering Journal 作者: Yang Wang, Xinyao Liu, Xinru Lin, Hongwei Yuan, Mingxia Liu, Lei Zhang 更新时间: 2024-10-06 摘要: To overcome the problems of the weak adsorption ability of biochar to heavy metal ions (HMIs) and competitive adsorption between HMIs and antibiotics during co-adsorption, the adsorbent material in which 2D sodium dodecylbenzenesulfonate-intercalated molybdenum disulfide nanosheets confined and growing near-vertically on 3D network biochar (SDBS-MoS2/BC) was synthesized. The SDBS-MoS2/BC demonstrated good adsorption ability for ciprofloxacin (CIP) and lead ions (Pb2+). Notably, the adsorption capacity of SDBS-MoS2/BC for the target in the binary system remains higher than in the single system, even at elevated concentrations of the competing target (Qmax,CIP = 393.701 mg g−1, Pb2+: 100 mg/L; Qmax,Pb = 264.550 mg g−1, CIP: 100 mg/L). This may be due to the improvement in the utilization of edge/interlayer adsorption sites by the near-vertical SDBS interlayer expansion of MoS2 as a heavy metal ion anchor. Furthermore, the spatial difference between the upper edge site of near-vertical SDBS-MoS2 and the BC plane, that is, the “longitudinal steric effect”, can separate the CIP and Pb2+ adsorptions in a different horizontal plane to avoid competitive adsorption. The underlying adsorption mechanism was elucidated through a series of experiments and the analysis of characterization results. Furthermore, the load of the SDBS-MoS2/BC sponge-packed column can continuously remove contaminants from water. The rapid, anti-interference, multifunctional and reusable properties make SDBS-MoS2/BC promising for excellent environmental treatment. |
290. 题目: Removal of Sulfamethoxazole Using Fe-Mn Biochar Filtration Columns: Influence of Co-existing Polystyrene Microplastics 文章编号: N24100609 期刊: Journal of Cleaner Production 作者: Jinsheng Huang, Andrew R Zimmerman, Yongshan Wan, Xue Bai, Hao Chen, Yulin Zheng, Yue Zhang, Yicheng Yang, Yuchuan Fan, Bin Gao 更新时间: 2024-10-06 摘要: Emerging contaminants, particularly antibiotics and microplastics (MPs), present significant challenges in wastewater treatment and pose large ecological risks. This study investigates the removal efficiency of sulfamethoxazole (SMX) using Fe-Mn modified biochar (BFM) in fixed bed filtration columns, emphasizing the effect of the presence of polystyrene microplastics (PS-MPs) on SMX behavior in both water (pH≈5.6) and selected wastewater (pH≈8) systems. Batch sorption results show that 10 mg/L SMX in 50 mL water can be completely removed by 100 mg BFM sorbent. The Bed Depth Service Time model indicated the BFM column is feasible for SMX removal in scaled-up continuous wastewater flow operations, while the Yan model best elucidates SMX filtration behavior and suggests the dominant adsorption mechanisms include external mass transfer and intraparticle diffusion. The present of both 20 mg/L and 100 mg/L PS-MPs (pH≈5.6) significantly reduced SMX retention due to competitive sorption. However, at pH 3.2, competitive sorption became negligible due to electrostatic interactions driving the PS-MPs sorption, while neutral charged SMX bound through hydrogen-bonds or π-π EDA interactions. Elevated pH shifted both PS-MPs and SMX sorption to non-electrostatic thus intensifying sorption competition, highlighting the influence of pH on their interaction dynamics. In wastewater, SMX filtration was slightly inhibited by 100 mg/L PS-MPs in BFM columns, whereas PS-MPs removal remained unaffected due to the high ionic strength and alkaline pH. These findings highlight the impact of MPs on pollution removal efficiency in filtration system, essential for enhancing biochar-based wastewater treatment strategies. |
291. 题目: Aridity drives the response of soil total and particulate organic carbon to drought in temperate grasslands and shrublands 文章编号: N24100608 期刊: Science Advances 作者: Baoku Shi, Manuel Delgado-Baquerizo, Alan K Knapp, Melinda D Smith, Sasha Reed, Brooke Osborne, Yolima Carrillo, Fernando T Maestre, Yu Zhu, Anping Chen, Kate Wilkins, Martin C Holdrege, Andrew Kulmatiski, Catherine Picon-Cochard, Christiane Roscher, Sally Power, Kerry M Byrne, Amber C Churchill, Anke Jentsch, Hugh A L Henry, Karen H Beard, Max A Schuchardt, Nico Eisenhauer, Rafael Otfinowski, Yann Hautier, Huitao Shen, Yonghui Wang, Zhongwu Wang, Chengliang Wang, Daniela Francis Cusack, Alessandro Petraglia, Michele Carbognani, T’ai G W Forte, S Flory, Pengli Hou, Tao Zhang, Weifeng Gao, Wei Sun 更新时间: 2024-10-06 摘要: The increasing prevalence of drought events in grasslands and shrublands worldwide potentially has impacts on soil organic carbon (SOC). We leveraged the International Drought Experiment to study how SOC, including particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) concentrations, responds to extreme drought treatments (1-in-100-year) for 1 to 5 years at 19 sites worldwide. In more mesic areas (aridity index > 0.65), SOC and POC concentrations decreased by 7.9% (±3.9) and 15.9% (±6.2) with drought, respectively, but there were no impacts on MAOC concentrations. However, drought had no impact on SOC, POC, or MAOC concentrations in drylands (aridity index < 0.65). The response of SOC to drought varied along an aridity gradient, concomitant with interannual precipitation variability and standing SOC concentration gradients. These findings highlight the differing response magnitudes of POC and MAOC concentrations to drought and the key regulating role of aridity. |
292. 题目: Optimized pyrolytic synthesis and physicochemical characterization of date palm seed biochar: unveiling a sustainable adsorbent for environmental remediation applications 文章编号: N24100607 期刊: Environmental Science and Pollution Research 作者: Rania Remmani, Murat Yılmaz, Saliha Benaoune, Luca Di Palma 更新时间: 2024-10-06 摘要: This study focuses on the optimization and comprehensive characterization of biochar synthesized from date palm seeds (DPS), a prevalent agricultural waste in arid regions. Using response surface methodology (RSM) with a central composite design (CCD), we optimized the pyrolysis process by investigating the effects of time (1–3 h) and temperature (600–900 °C) on critical properties such as specific surface area, pore volume, and yield. The optimized biochar, produced at 828 °C for 1.7 h, demonstrated a high specific surface area of 654.8 m2/g and well-developed microporosity. Characterization techniques, including XRD, FTIR, SEM–EDS, and BET analyses, revealed an amorphous carbon structure with graphitic domains, diverse surface functionalities, and a heterogeneous porous microstructure. The biochar’s point of zero charge at pH 7.58 indicates its potential for selective adsorption of charged contaminants. The close agreement between RSM-predicted and experimental values for specific surface area (652.1 m2/g vs. 654.8 m2/g) and micropore volume (0.191 cm3/g vs. 0.190 cm3/g) validates the effectiveness of the model in optimizing biochar properties. This research highlights the potential of DPS-derived biochar as a sustainable adsorbent for environmental remediation, opening avenues for valorizing agricultural wastes and contributing to circular economy principles. |
293. 题目: A comprehensive review of soil organic carbon estimates: Integrating remote sensing and machine learning technologies 文章编号: N24100606 期刊: Journal of Soils and Sediments 作者: Tong Li, Lizhen Cui, Matthias Kuhnert, Timothy I McLaren, Rajiv Pandey, Hongdou Liu, Weijin Wang, Zhihong Xu, Anquan Xia, Ram C Dalal, Yash P Dang 更新时间: 2024-10-06 摘要: PurposeAccurately assessing soil organic carbon (SOC) content is vital for ecosystem services management and addressing global climate challenges. This study undertakes a comprehensive bibliometric analysis of global estimates for SOC using remote sensing (RS) and machine learning (ML) techniques. It showcases the historical growth and thematic evolution in SOC research, aiming to amplify the understanding of SOC estimation themes and provide scientific support for climate change adaptation and mitigation. Materials and MethodsEmploying extensive literature database analysis, bibliometric network analysis, and clustering techniques, the study reviews 1,761 articles on SOC estimation using RS technologies and 490 articles on SOC employing both RS and ML technologies. Results and DiscussionThe results indicate that satellite-based RS, particularly the Landsat series, is predominant for estimation of SOC and other associated studies, with North America, China, and Europe leading in evaluations with Africa is having low evaluations adopting RS technology. Trends in the research demonstrate an evolution from basic mapping to advanced topics such as carbon (C) sequestration, complex modeling, and big data utilization. Thematic clusters from co-occurrence analysis suggest the interplay between technology development, environmental surveys, soil properties, and climate dynamics. ConclusionThe study highlights the synergy between RS and ML, with advanced ML techniques proving to be critical for accurate SOC estimation. These findings are crucial for comprehensive ecosystem SOC estimation, informed environmental management and strategic decision-making. |
294. 题目: How the effect of earthworms on soil organic matter mineralization and stabilization is affected by litter quality and stage of soil development 文章编号: N24100605 期刊: Biogeochemistry 作者: Saliha Irshad, Jan Frouz 更新时间: 2024-10-06 摘要: Globally soil fauna consumes about half of the annual litter fall. An important question is how this activity affects the mineralization and stabilization of soil organic matter. Here we explore how much earthworms influence the decomposition of litter and the stabilization of organic matter in soils at various stages of soil development (various soil age) that are supplied with litter of various quality. The laboratory mesocosms consist of litter and a mineral layer. The mineral soils originated either from spruce and alder stands growing either on post-mining soils (young soils after about 50 years of soil development) or from soils in the close vicinity of post-mining sites (mature soils with several thousand years of soil development), the mineral soils were supplied by matching litter, the mesocosms were either without earthworms or with two individuals of earthworms. The earthworm effect showed statistically significant interaction with tree and soil age: earthworms increased respiration in both alder soils, but in spruce soils only in mature soil, while the opposite was true for young soils. In general, earthworms promoted the removal of litter from the soil surface and carbon accumulation in the mineral soil. Earthworms promoted C storage in mineral associated organic matter (MAOM), especially in young spruce soils. The results suggested that earthworm activity in young soils which were far from saturation (spruce on post-mining soils) promotes soil C sequestration by promoting C storage in MAOM, whereas earthworms in mature, C saturated soils tend to promote soil respiration. More broadly, earthworms effect on soil depends on stage of soil C saturation. |
295. 题目: Enhanced anaerobic digestion for energy recovery from brewery wastewater employing nano zero-valent iron loaded biochar prepared by residual sludge 文章编号: N24100604 期刊: Chemical Engineering Journal 作者: Jibin Li, Siqi Wu, Weiming Zhang, Bingcai Pan, Ming Hua 更新时间: 2024-10-06 摘要: Anaerobic digestion is an effective wastewater energization technology, but suffers from low energy conversion efficiency. In this study, a novel biochar was successfully prepared by incorporating extracellular polymeric substances (EPS) to residual sludge, and the anaerobic digestion performance could be significantly improved by employing this biochar loaded with nano zero-valent iron (NZVI@EPSBC). In comparison to the control, the cumulative methane production with 100 mg/L NZVI@EPSBC was raised by approximately 1.4-fold. The NZVI@EPSBC did not significantly change the morphology of the inoculated granular sludge, but induced the secretion of proteins and humic substances in the extracellular EPS, which are beneficial for carbon conversion and extracellular electron transport at the microscopic scale. Meanwhile, the quantitative analysis of the electron transport system also confirmed that NZVI@EPSBC could significantly improve the electron transfer efficiency in microbial respiratory chain throughout the experimental cycle, in which the highest respiratory efficiency increase of 26.51 % at 48 h. Taxonomic analysis of microbial communities showed that NZVI@EPSBC exhibited complete retention of bacteria and archaea compared to the raw sludge, while realizing an efficient cooperative pattern of syntrophic bacteria by regulating the relative abundance of specific functional bacteria, like Anaerolineaceae and Methanosaeta. Overall, the study offers a valuable strategy for achieving resourcefulness of residual sludge and EPS along with facilitating efficient energy recovery from wastewater. |
296. 题目: Urchin-shaped hollow H-ZIF-8@Zn-MOF-74 metal-organic framework for efficient adsorption and detection organic nitrogen pesticides in different tea and waste water 文章编号: N24100603 期刊: Separation and Purification Technology 作者: Xinzhong Zhang, Xuemei Wang, Zhen Zhang, Jingwei Liu, Lin Fan, Jun Chen, Xinzhen Du, Xiaoquan Lu 更新时间: 2024-10-06 摘要: Because of rapid industrialization and agriculturalization, solving the pressing problems of environment pollution, especially water and food quality, requires innovative solutions. Pesticides, notably organic nitrogen pesticides (ONPs). It was a ubiquitous pollutant that requires effective adsorption and removal strategies due to its harmful effects on health. Here, an amazing method was proposed for efficient adsorption and sensitive detection six ONPs in different tea and waste waters. This study outlined the successful construction of a urchin-shaped hollow metal organic framework (named as H-ZIF-8@Zn-MOF-74) by solvothermal conversion strategy, resulting in the fabrication of solid-phase microextraction (SPME) fiber coating. The orthogonal experimental design (OED) was used to evaluate the effects of five factors and five levels of experimental parameters. Under the optimal conditions, the coated SPME fiber exhibited excellent removal efficiency for six ONPs, the maximum adsorption capacities were 31.82, 19.67, 26.96, 52.59, 18.67, and 25.46 mg g−1, respectively, this was attributed to the hollow structure and open coordination unsaturated metal sites. Moreover, the established detection method presented a wider linear range (0.072–1000 μg/L), lower detection limits (LOD) (0.021–0.422 μg/L) and quantification limits (LOQ) (0.072–1.406 μg/L). The relative recovery rate of pesticide analysis was from 83.86 % to 111.8 %, and the relative standard deviation of real water samples was 0.548 % to 7.336 %. The developed SPME fiber demonstrated notable stability and durability even after many uses, suggesting their strong potential for future applications in adsorption and extraction of solution. This innovative method offered a direct and eco-friendly approach for fabricating MOFs-based SPME fibers to organic pollutants. |
297. 题目: Investigating the role of extracellular polymeric substances produced by Parachlorella kessleri in Zn(II) bioremediation using atomic force microscopy 文章编号: N24100602 期刊: Environmental Pollution 作者: Victoria Passucci, Ophélie Thomas-Chemin, Omar Dib, Antony Ali Assaf, Marie-José Durand, Etienne Dague, Maria Mar Areco, Cécile Formosa-Dague 更新时间: 2024-10-06 摘要: Microalgae, such as Parachlorella kessleri, have significant potential for environmental remediation, especially in removing heavy metals like zinc from water. This study investigates how P. kessleri, isolated from a polluted river in Argentina, can remediate zinc. Using atomic force microscopy (AFM), the research examined the interactions between Zn particles and cells grown with different nitrogen sources—nitrate or ammonium. The results showed that cells grown with nitrate produced extracellular polymeric substances (EPS), while those grown with ammonium did not. Raman spectroscopy revealed distinct metabolic responses based on the nitrogen source, with nitrate-grown cells showing altered profiles after zinc exposure. Zinc exposure also changed the surface roughness and nanomechanical properties of the cells, particularly in those producing EPS. AFM force spectroscopy experiments then confirmed strong Zn binding to EPS in nitrate-grown cells, while interactions were weaker in ammonium-grown cells that lacked EPS. Overall, our results elucidate the critical role of EPS in Zn removal by P. kessleri cells and show that Zn remediation by P. kessleri is mediated by EPS adsorption. This study underscores the significance of regulating nitrogen sources to stimulate EPS production, offering insights that are essential for subsequent bioremediation applications. |
298. 题目: Pyrolytic conversion of cattle manure into value-added products and application of biochar for adsorption of sulfamethoxazole 文章编号: N24100601 期刊: Chemosphere 作者: Kwangsuk Yoon, Gihoon Kwon, Eunji Kim, Heuiyun Lee, Dong-Jun Lee, Hocheol Song 更新时间: 2024-10-06 摘要: This study investigated the thermochemical conversion of cattle manure (CM) to propose a sustainable platform for its valorization, and explored the applicability of CM-derived biochar (CMB) as an environmental medium for the adsorptive removal of sulfamethoxazole (SMZ). CM pyrolysis was conducted under two atmospheric conditions (N2 and CO2), and the pyrogenic products were quantified and characterized. Real-time syngas monitoring revealed that CO2 enhanced CO generation from the CM, leading to the formation of a highly porous carbon structure in the produced biochar (CMBCO2). The adsorptive removal of SMZ by CMBCO2 was highly dependent on the pH conditions. The adsorption kinetics of SMZ onto CMBCO2 reached equilibrium within 540 min, following a pseudo-second-order model. The SMZ adsorption isotherms fit the Langmuir-Freundlich model, highlighting the importance of chemisorption in the adsorption process. X-ray photoelectron spectroscopy revealed that SMZ was adsorbed by non-electrostatic mechanisms, including hydrogen bonding, Lewis acid-base interactions, surface complexation, and π–π electron-donor acceptor interactions. This study presents an exemplary strategy for converting livestock waste into valuable resources, enabling the harvesting of energy resources and the production of treatment media for environmental remediation. |
299. 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. |
300. 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. |
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