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101. 题目: Selective phosphate separation and enrichment from real digestate via membrane capacitive deionization using LDH/biochar composite electrodes
文章编号: N26013111
期刊: Separation and Purification Technology
作者: Yuxin Qu, Jiakang Li, Yin Lu, Dandan Huang, Jaehac Ko, Qiyong Xu
更新时间: 2026-01-31
摘要: Selective separation and enrichment of phosphate from complex wastewater streams remains a major challenge due to high ionic strength and strong competition from coexisting anions. Here, membrane capacitive deionization (MCDI) equipped with Mg3FeAl layered double hydroxide/biochar (Mg3FeAl-LDH/31CE) composite electrodes is investigated for phosphate recovery from real anaerobic digestion-membrane bioreactor (AD-MBR) permeate. The electrode is fabricated entirely from waste-derived feedstocks, using coffee grounds and eggshells to replace conventional fossil-based carbon materials and chemical precursors. The electrode sustained phosphate adsorption capacities of 55.85–60.82 mg g−1 and regeneration efficiencies of 89.3%–98.8% over 50 adsorption-desorption cycles, while maintaining its morphology, capacitance, and > 98.5% retention of Mg, Fe, and Al. The desorption stream exhibited ~15-fold phosphate enrichment (~950 mg L−1), whereas co-ions exhibited substantially lower enrichment (2.57–3.30), yielding removal selectivity coefficients exceeding 7 in the multi-anion matrix. The total specific energy consumption was 4.85 ± 0.21 kWh kg−1-P. A comparative life-cycle assessment further shows that substituting conventional precursors with waste-derived materials yields a 3–7% reduction in global warming, acidification, and eutrophication potentials per kilogram of phosphorus recovered. These results demonstrate that waste-derived LDH/biochar electrodes can deliver separation-relevant selectivity while advancing waste-to-resource strategies aligned with green chemistry principles.

102. 题目: Calcium/iron co-modified biochar for enhanced arsenic removal: Differential mechanisms for As(III) and As(V) and effective soil remediation
文章编号: N26013110
期刊: Journal of Environmental Chemical Engineering
作者: Kun Zhang, Peiyao Xu, Yanfang Ding, Yujie Lu, Meng Xu, Shenghua Zhang
更新时间: 2026-01-31
摘要: Soil arsenic (As) contamination poses a serious threat to ecosystems and human health. While unmodified biochar served as an effective soil amendment, its capacity to immobilize As in soil remained limited. This study developed a novel calcium/iron (Ca/Fe) co-modified peanut shell biochar (CF@BC) to enhance arsenic immobilization. The Ca/Fe modification optimized pore structure, increased the specific surface area (from 35.4 to 43.7 m2/g), and enriched surface functional groups (e.g., M–O/OH, C–OH, M–O–C), facilitating efficient adsorption of both As(III) and As(V) via heterogeneous multilayer chemisorption. Furthermore, adsorption performance was pH-dependent in both cases, though trends differed. The optimal As(III) adsorption occurred under acidic conditions (maximum adsorption capacity, Qₘₐₓ = 114.3 mg/g at pH 3), primarily mediated by the formation of Fe–O–As and FeO–Ca–As coordination bonds, O–Cdouble bondO/Cdouble bondO–As complexes, and minor chemical precipitation of surface arsenite/arsenate. In contrast, As(V) adsorption was most effective under alkaline conditions (Qₘₐₓ = 170.0 mg/g at pH 11), dominated by the formation of M/C–O–As complexes and precipitates such as calcium arsenate and johnbaumite. Soil incubation experiments confirmed CF@BC addition stabilized arsenic fractions, decreasing the mobile fractions in As(III) and As(V) contaminated soil by 15 % and 10 %, respectively, thereby reducing leaching risk. Life cycle assessment further demonstrated low environmental impact during production. CF@BC represented an economic, environmental friendly, and efficient material for remediating As-contaminated soils, demonstrating significant application potential.

103. 题目: Synergistic enhancement of anaerobic acidogenic fermentation in food waste: role of extracellular polymeric substances and trace elements
文章编号: N26013109
期刊: Journal of Environmental Chemical Engineering
作者: Zhang Yongmei, Qu Wenhui, Li Guorui, Zhang Jiajia, Zhang Chi, Hu Yisong, Zhou Hui
更新时间: 2026-01-31
摘要: This study developed a chelating-based strategy to overcome the limited effectiveness of trace elements (TEs, such as Fe, Co, Ni) in enhancing the anaerobic fermentation of food waste, which often is caused by the narrow optimal concentration ranges and their low bioavailability. Results indicated that Ni with the optimal concentration of 2.5 mg/L exhibited the best information in promoting hydrolysis and acidogenesis in comparison to Fe and Co. More importantly, when a chelating agent, including citric acid, nitrilotriacetic acid, ethylenediaminetetraacetic acid, ethylenediamine-N,N′-disuccinic acid, and extracellular polymeric substances (EPS), was used to complex with Ni, the production of volatile fatty acids (VFAs) exceeded that by solely using 1.25 mg/L of Ni. Especially, when EPS was applied to cheat with Ni, VFAs production was even better than the optimal level obtained at 2.5 mg/L of Ni. Mechanism investigation revealed that EPS promotes a more efficient complexation via multi-ligand interactions, achieving an optimal equilibrium between Ni retention and bioavailability, thereby leading to superior acidogenic performance. Furthermore, the supplementation of the EPS-Ni complex effectively regulates the microbial community through the enrichment of hydrolytic and acidogenic bacteria, thus systematically promoting VFA production. These findings indicated that EPS could serve as a sustainable, bio-derived chelating agent, which could overcome the economic and environmental drawbacks of synthetic chelators and present a novel strategy to enhance TE bioavailability for the efficient valorization of food waste.

104. 题目: Influence of pH and Nitrogen Source on Metabolism and Extracellular Polymeric Substance Production in a mixed aerobic methanotrophic community
文章编号: N26013108
期刊: Journal of Environmental Chemical Engineering
作者: D Primo-Catalunya, M I Peña-Castro, A Sánchez-Melsió, J L Balcázar, M Pijuan
更新时间: 2026-01-31
摘要: Aerobic methanotrophs are key regulators of methane emissions and have recently gained interest for their potential in biotechnological applications. Here, enrichment cultures from activated sludge were subjected to fed-batch experiments testing two nitrogen sources (nitrate and ammonium) under three pH conditions (4.5, 6.5, and 8.5) to investigate their potential for exopolymeric substances (EPS) production. Neutral and alkaline pH resulted in a similar consumption of nitrogen independently of the nitrogen source added. However, tests conducted with acidic pH resulted in a slower nitrogen consumption rate, especially in those tests where ammonium was added, stopping its consumption after the third ammonium pulse. Community profiling revealed the dominance of the phylum Pseudomonadota with Methylocystis as the most abundant methanotroph. EPS production was strongly induced at pH 4.5, where concentrations increased substantially after 5 days and remained elevated. By contrast, neutral and alkaline conditions yielded only modest EPS levels, regardless of the nitrogen source.

105. 题目: Benthic–pelagic interactions and algal-derived organic matter dynamics along the East Siberian Sea slope revealed by fluorescence and isotope tracers
文章编号: N26013107
期刊: Marine Pollution Bulletin
作者: Silpa Mathew, Jong Kuk Hong, Tae Siek Rhee, Kyung-Hoon Shin, Seeryang Seong, Ji-Hoon Kim, Meilian Chen, Jin Hur
更新时间: 2026-01-31
摘要: The Arctic Ocean is undergoing rapid transformation driven by climate change, including declining sea-ice cover and increasing freshwater inputs, with profound consequences for carbon and nutrient cycling. The East Siberian Sea (ESS), one of the largest Arctic shelf systems, plays a central role in linking terrestrial inputs, primary production, and deep-ocean carbon export. In this study, we combined fluorescence spectroscopy with stable isotope and bulk chemical analyses to examine dissolved organic matter (DOM) dynamics along a shelf-slope transect of the ESS. Our results show that slope-associated sedimentary processes exert a strong control on DOM redistribution and transformation. Enhanced algal production across the Russian Arctic increasingly contributes to organic matter transport toward slope regions. Elevated chlorophyll-a concentrations in waters, together with a pronounced enrichment of protein-like fluorescent DOM (C3), point to strong algal inputs to the continental slope. At mid-slope stations (200–900 m), co-enrichment of dissolved and particulate organic carbon with heavier δ15N signatures suggests intensified microbial remineralization and nitrogen cycling, likely stimulated by sediment resuspension under Atlantic Water influence. These findings highlight the ESS slope as a dynamic benthic–pelagic interface where sedimentary processes reshape DOM composition and act as an important pathway for the supply of bioavailable carbon and nitrogen to the Arctic Ocean interior. Overall, this study highlights the continental slope as an active regulator of Arctic DOM cycling under ongoing Atlantification and sea-ice decline.

106. 题目: The interplay of plants and microbial communities in modulating dissolved organic matter dynamics in a Tibetan glacier forefield
文章编号: N26013106
期刊: Plant and Soil
作者: Yang Liu, Saifei Li, Pengfei Liu, Quan Shi, Chen He, Mukan Ji
更新时间: 2026-01-31
摘要: Aims This study investigates the changes in microbial community (bacteria, fungi, and algae) and DOM during ecosystem primary succession in glacier forefield. The core scientific question is how shifting plant and microbial assemblies differentially contribute to DOM molecular recalcitrance and stability across a successional gradient Methods Using a space-for-time substitution at the Kuoqionggangri Glacier forefield (Tibetan Plateau), we sampled surface soils (0–10 cm) from barren ground, herb steppe, and legume steppe stages. Microbial communities were profiled via 16S, 18S rRNA gene, and ITS amplicon sequencing, while DOM composition was characterized using Fourier transform ion cyclotron resonance mass spectrometry. We employed co-occurrence network analysis to identify specific microbe-DOM associations and molecular mass shift analysis to quantify biochemical transformations and estimate microbial contributions to recalcitrant DOM accumulation. Results Plant colonization increased bacterial, fungal, and algal diversity, whereas subsequent plant succession-induced changes were taxonomically restricted in bacteria and fungi but triggered a systemic turnover of the algal community. We found that specialists, including Chloroflexi, Cyanobacteria, and Actinobacteriota, were primarily associated with recalcitrant DOM, whereas generalists (Bacteroidota, Planctomycetota, fungi, and algae) interacted with a diverse range of DOM types. Additionally, the drivers of DOM recalcitrance shifted over succession. Plant-derived inputs determined recalcitrance during initial colonization, whereas microbial reprocessing became the dominant driver during subsequent ecosystem development. Conclusion This study demonstrates that DOM stability is governed by a successional transition from plant-mediated inputs to taxon-specific microbial transformations. These findings provide a mechanistic framework for understanding organic carbon dynamics in rapidly evolving proglacial landscapes.

107. 题目: Enhanced copper-based electro-Fenton process with a B-doped biochar cathode for degradation of membrane concentrated landfill leachate
文章编号: N26013105
期刊: Chemical Engineering Journal
作者: Chunying Teng, Zhihua Wang, Haoyan Lv, Ming Zhang, Haifeng Zhang, Zhi Xu
更新时间: 2026-01-31
摘要: Electro-Fenton technology represents a highly promising approach for treating refractory organic wastewater. However, its practical implementation is constrained by a narrow effective pH range and low H2O2 production efficiency. In this study, a copper-based electro-Fenton system was constructed using a boron-doped biochar (B-BC) cathode. Material characterization and electrochemical analyses demonstrated that B doping effectively modulates the surface chemistry of the cathode, significantly enhancing H2O2 generation and electron transfer efficiency. Under optimized conditions, the system maintained excellent removal performance for membrane concentrated landfill leachate (MCLL) within a near-neutral pH range (5–7). Identification of reactive oxygen species revealed that ·OH and 1O2 jointly dominated the oxidation process, with 1O2 generation being markedly promoted by B doping. Furthermore, by integrating spectroscopic techniques with chemometric analysis, the structural evolution of dissolved organic matter in MCLL during the reaction was elucidated, and the positive contribution of leachable organic components from the B-BC cathode to the degradation process was confirmed. This work provides a theoretical and experimental basis for advancing efficient, stable, and pH-tolerant electro-Fenton technology in practical wastewater treatment. However, the long-term stability of catalysts under extreme conditions requires further investigation, and the potential for industrial application also needs to be further assessed through systematic techno-economic analysis.

108. 题目: Electrocatalytic degradation of norfloxacin using biochar electrode derived from oily sludge: Synergistic effects of hydrothermal and pyrolytic treatment
文章编号: N26013104
期刊: Chemical Engineering Journal
作者: Quxin Cong, Rui Jia, Juan Zhou, Lei Li, Pin Gao
更新时间: 2026-01-31
摘要: The disposal of large quantities of oily sludge remains a significant global challenge in terms of resource utilization. In this study, oily sludge was transformed into biochar specifically via a sequential process involving hydrothermal carbonization (HTC) at 250 °C followed by pyrolysis at 800 °C (HTC-250-PY-800). This integrated biochar was comprehensively compared against those produced solely using HTC or pyrolysis. The results showed that HTC-250-PY-800 exhibited a higher density of structural defects and a more highly developed spatial structure. It demonstrated the highest oxygen evolution potential alongside the lowest charge transfer resistance. When employed as a biochar electrode, HTC-250-PY-800 achieved exceptional removal efficiency (98.5%) of norfloxacin within 2 h, significantly outperforming biochars produced from either individual process. Additionally, this integrated biochar maintained robust catalytic performance across a broad pH range (3−11) and retained high degradation efficiency and stability over five continuous cycles. Quenching experiments confirmed that •OH and 1O₂ collaboratively drove norfloxacin degradation. Based on detailed DFT calculations and UPLC-TOF-MS analyses, potential degradation pathways for norfloxacin were proposed. This study not only provides an effective two-stage strategy for converting waste oily sludge into high-value functional electrode materials, but also highlights the potential of oily-sludge-derived biochar as a sustainable catalyst for degrading emerging pollutants.

109. 题目: Three Decades of Litter Manipulation Distinctly Shifts Soil Organic Matter Composition and Constrains Soil Carbon Sequestration in Temperate Forest Soils.
文章编号: N26013103
期刊: Environmental Science & Technology
作者: Isla Wrightson, Meiling Man, Laura Castañeda-Gómez, Nivetha Srikanthan, Huan Tong, Melissa A Knorr, Serita D Frey, Knute J Nadelhoffer, Kate Lajtha, Myrna J Simpson
更新时间: 2026-01-31
摘要: The capacity of forest soils to sequester carbon (C) is susceptible to shifts in the litter quantity and chemistry. Using measurements from the third decade of a long-term Detrital Input and Removal Treatment (DIRT) experiment at Harvard Forest (MA, USA), extending previously published work from 20 years, we examined how litter inputs shape soil organic matter (SOM) chemistry. Elemental analysis, targeted compound analysis, solid-state 13C nuclear magnetic resonance (NMR) spectroscopy, and microbial biomass and community composition measurements were used. Despite doubled litter inputs over 30 years, no net soil C accumulation occurred, and the SOM decomposition stage was similar to the control, suggesting continuous microbial processing of added inputs. The exclusion of litter, roots, or both led to lower soil C and more advanced SOM decomposition in mineral soils. Shifts in microbial community composition, particularly an increase in Gram (+) to Gram (-) bacteria under exclusion treatments, point to microbial reorganization in response to altered substrate availability. This long-term study underscores the limited potential for long-term soil C sequestration due to sustained microbial decomposition and the role of continuous plant inputs in shaping SOM chemisty under changing detrital regimes in a temperate forest.

110. 题目: Target prepared Nitrogen-Doped lignin biochar anchored Co-Mn oxides for directed singlet oxygen generation in fenton-like Reactions: Performance and mechanism
文章编号: N26013102
期刊: Bioresource Technology
作者: Yubing Lu, Jinwen Hu, Xiao Cao, Qiujie Huang, Nanwen Zhu
更新时间: 2026-01-31
摘要: Converting lignin into biochar-based Fenton-like catalysts represents a promising strategy for the upgrading of lignin. Herein, Co-Mn layered bimetallic oxides (CML) was anchored onto nitrogen-doped lignin biochar (NLBC) to achieve targeted enhancement of singlet oxygen (1O2) generation in peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs). The NLBC-anchored CML (CMLN)/PMS system achieved nearly completely (>99%) degradation of antibiotics within 20 min with the of 0.28 min−1. It maintained excellent catalytic performance in real-water environments and across a wide pH range, remaining over 85% catalytical activity after 4 cycles. Experiments and theoretical calculations demonstrated that the NLBC anchoring strategy induces localized charge redistribution, enhancing the electron density at Co sites and promoting electron transfer. Moreover, NLBC favored the preferential coordination PMS with electron-rich Co sites, thereby achieving targeted enhancement of 1O2 generation. Overall, this work offers a promising strategy for value-added conversion of lignin resources into efficient Fenton-like catalysts for wastewater treatment.

111. 题目: Full-scale analysis of dissolved organic matter in multi-stage wetlands treating wastewater treatment plant effluent and optimization of treatment process
文章编号: N26013101
期刊: Bioresource Technology
作者: Yu Chen, Jianfeng Ye, Hong Liu, Wenxuan Jiang, Feng Hu, Zuxin Xu
更新时间: 2026-01-31
摘要: Trace organic micropollutants (OMPs) in wastewater treatment plant (WWTP) effluents pose ecological risks, while cost-effective removal strategies using constructed wetlands (CWs) remain unclear. This study investigated a multi-stage wetland system using spectroscopic and molecular-level indicators to link pollutant removal, dissolved organic matter (DOM) transformation, and biotoxicity. Biological Oxidation Pond (BOP), Subsurface Flow Wetland (SSFW), and Surface Flow Wetland (SFW) contributed 25.00%, 25.00%, and 50.00% of chemical oxygen demand (COD) removal, respectively, with overall inhibition rates below 10% and nearly zero after SSFW. DOM fluorescence intensity decreased by 23.44%, and Specific Ultraviolet Absorbance at 254 nm (SUVA254) , modified Aromaticity Index (AImod) , formulas containing C, H, O, and N or S (CHON/CHOS) revealed compositional and toxicity-related changes. SSFW removed protein-like DOM, while SFW targeted humic-like fractions; ceramsite outperformed zeolite in SSFW. Sedimentation Tank (ST) and Deep Purification Pond (DPP) were redundant, whereas the “BOP-SSFW-SFW” configuration achieved advanced purification and biotoxicity control.

112. 题目: New tuff constraints on episodic volcanism and consequent carbon sequestration during the Ediacaran-Cambrian transition in South China
文章编号: N26012910
期刊: Palaeogeography, Palaeoclimatology, Palaeoecology
作者: Zhen Yang, Yong Fu, Zongxiang Zhang
更新时间: 2026-01-29
摘要: Tuffs (or K-bentonites) were widely developed in South China during the Ediacaran–Cambrian (E-C) transition. These volcaniclastic layers are typically intercalated within dolostones and phosphorites in Yunnan, whereas they occur primarily within cherts in Guizhou and Hunan. They are often overlain by black shale series, overall. An integrated geochemical and geochronological study has been conducted on tuff layers from two continuous deep-water sedimentary successions in South China, in order to examine the influence of volcanic activity on the paleoenvironment and its potential role as a carbon-sink trigger. Samples were collected from the middle Liuchapo Formation at the Bahuang section (Tongren) and from the topmost Liuchapo Formation at the Yacha section (Sansui). Analytical work included whole-rock major and trace elements, zircon UPb dating and trace elements, and LuHf isotopic analysis. The study reveals that the zircon crystallization age of the Bahuang tuff is 549.9 ± 2.0 Ma (MSWD =0.28), and that of the Yacha tuff is 513.4 ± 2.1 Ma (MSWD =0.07). The zircon εHf(t) values of the Bahuang tuff are predominantly negative, ranging from −5.17 to 2.77, while those of the Yacha tuff range from −0.71 to 4.67. Indicates that the magmatic sources for both the Bahuang and Yacha tuffs were derived from the mantle and juvenile lower crust, with the Bahuang tuff incorporating a greater proportion of ancient crustal material. The magmatic oxygen fugacity of both the Bahuang and Yacha tuffs was relatively lower, with Yacha tuff exhibiting slightly higher values than Bahuang tuff. The influence of oxygen fugacity on carbon sedimentation appears insignificant. Following the volcanic activity, these parameters K₂O, Al₂O₃, and TFe₂O₃ of black shale showed significant increases, with TOC exhibiting a clear positive correlation. This demonstrates that volcanic activity introduced nutrients such as Fe, K, Ca, and P, thereby enhancing paleo-productivity and facilitating the enrichment of organic carbon. This indicates that volcanic activity during the E-C transition acted as a trigger for enhanced carbon sinks.

113. 题目: Aridity dependency of soil plant- and microbial-derived carbon in mongolia plateau in northern China
文章编号: N26012909
期刊: Geoderma
作者: Shaoyu Li, Lishan Yang, Feng Zhang, Jiahua Zheng, Bin Zhang, Guodong Han, Mengli Zhao
更新时间: 2026-01-29
摘要: Soil plant-derived carbon (PDC) and microbial-derived carbon (MDC) represent the two primary sources of soil organic carbon (SOC). The relative proportions of these carbon (C) sources shape SOC composition, accumulation, stability, and turnover. Dryland ecosystems, while serving as critical C reservoirs, are particularly vulnerable to climate change. However, the influence of aridity on PDC and MDC sequestration remains understudied at the regional scale, which limits our ability to understand and predict soil C dynamics in drylands under the context of global warming. To address this knowledge gap, we measured PDC, MDC, and associated biotic and abiotic variables at 90 sampling sites along a ∼ 3000 km transect across the Mongolian Plateau. We examined the biogeographical distribution patterns of PDC and MDC along a natural aridity gradient. Our findings revealed that both PDC and MDC declined concurrently in response to increasing aridity. Based on the contributions of PDC and MDC to SOC, we identified the shifting point marking the transition in the dominance of different pathways of the microbial C pump. This shifting point was further validated using microbial C use efficiency (CUE) and soil extracellular enzyme activity. In subhumid-semiarid region (aridity = 0.37), the contribution of PDC to SOC exceeds that of MDC, coupled with higher extracellular enzyme activity, indicating the dominance of ex vivo modification. Here, PDC formation is primarily driven by the microbial fragmentation of abundant plant litter. High precipitation and nutrient availability in these areas further support the conversion of microbial biomass C into MDC. In contrast, in semiarid region (aridity = 0.78), the contribution of PDC to SOC is lower than that of MDC, coupled with higher microbial CUE, indicating the dominance of in vivo turnover. MDC accumulation is promoted by physical protection mechanisms, such as increased clay and silt content, while PDC formation is constrained by limited root C inputs. Our findings provide new insights into the mechanisms of SOC sequestration in drylands and emphasize the need to consider both PDC and MDC in strategies aimed at preserving the terrestrial C sink under current and future climate change.

114. 题目: Iron-modified barley straw biochar for nitrate and phosphate removal from water.
文章编号: N26012908
期刊: Environmental Science and Pollution Research
作者: Sepideh Ansari, Ricardo Bello-Mendoza, Aisling O’Sullivan
更新时间: 2026-01-29
摘要: Excessive nitrate and phosphate in water pose serious environmental and health risks, requiring effective and sustainable removal methods. This study investigates the efficiency of iron-modified biochar derived from barley straw (Fe-BSBC) for removing these pollutants from water. The influence of contact time, pH, adsorbent dosage, and competing anions on adsorption performance was tested in batch experiments. At pH 6 and 23 ± 1 °C, with an initial adsorbate concentration of 15 mg/L and adsorbent dosages of 5 g/L for phosphate and 15 g/L for nitrate, equilibrium was achieved within 8 h for phosphate and 24 h for nitrate. Fe-BSBC demonstrated adsorption capacities of 13.7 mg/g for phosphate and 2.0 mg/g for nitrate, outperforming most of the previously reported biochar adsorbents. Isotherm modelling indicated that the Sips model best described the adsorption process, suggesting multilayer and heterogeneous adsorption. Predicted maximum adsorption capacities were 22.0 mg/g for phosphate and 4.07 mg/g for nitrate. Kinetic data aligned with the pseudo-second-order model, indicating chemisorption as the primary mechanism. Electrostatic attraction was identified as the main mechanism for nitrate adsorption, evidenced by a decrease in zeta potential after nitrate uptake and supported by FTIR, EDS, and XRD characterisation. Conversely, phosphate removal was mainly driven by ligand exchange, leading to the formation of Fe-O-P complexes, alongside electrostatic interactions. Overall, Fe-BSBC presents a cost-effective and scalable water treatment solution that supports the Sustainable Development Goals.

115. 题目: Magnesium oxide-functionalized biochar synthesis from municipal solid waste for Pb(II) removal in aqueous media and potential application in leachate remediation.
文章编号: N26012907
期刊: Environmental Science and Pollution Research
作者: Nkululeko Sabelo Dlamini, Pawan Kumar Jha, Pradeep Kumar Sharma
更新时间: 2026-01-29
摘要: Pb(II) contamination from landfill leachate poses a serious environmental and public health risk. This study demonstrates the valorisation of municipal solid waste (MSW) into an efficient Pb(II) adsorbent through MgO functionalisation of MSW-derived biochar using MgCl₂·6H₂O. Pristine biochar (P-BC) and MgO-modified biochar (MgO-BC) were synthesised from the organic fraction of MSW through pyrolysis at 450 °C. SEM and FTIR analyses confirmed enhanced porosity and the introduction of Mg-O functional groups following modification. Batch adsorption experiments showed strong pH dependence, with maximum Pb(II) removal at pH 11 of 83.50% for P-BC and 99.82% for MgO-BC. Adsorption data were best described by the Freundlich isotherm and pseudo-second-order kinetic models, indicating multilayer chemisorption on heterogeneous surfaces. Langmuir maximum adsorption capacities were 24.82 mg/g for P-BC and 36.63 mg/g for MgO-BC. Intra-particle diffusion analysis revealed that boundary layer film diffusion dominated the adsorption process. Characterisations and comparative experiments confirm that MgO functionalisation significantly improves Pb(II) adsorption performance through the synergistic effects of ion exchange, electrostatic attraction, complexation, precipitation, and pore diffusion mechanisms. Overall, the results demonstrate the potential of MSW-derived biochar as a cost-effective, sustainable solution for landfill leachate treatment, supporting circularity and resource recovery in MSW management.

116. 题目: Impact of batch seeding on the development of biological activated carbon filter for the simultaneous removal of organics, nitrogen, and emerging contaminants from secondary effluents
文章编号: N26012906
期刊: Environmental Science: Water Research & Technology
作者: Srikanth V, Bhanu Prakash Vellanki
更新时间: 2026-01-29
摘要: This study evaluates the batch seeding of granular activated carbon (GAC) with sludge inocula and raw sewage to accelerate its transformation into biological activated carbon (BAC) and achieve rapid steady-state condition, fostering the development of microbial community and simultaneous degradation of residual organics, nitrogen, and emerging contaminants (ECs) from secondary effluents. After 7 days of seeding, pathogens dominated the surface of GAC while heterotrophs, nitrifiers, and denitrifiers were scarce. However, a sustained aerobic condition in the column shifted the community towards these beneficial microbes, enabling rapid biofilm development and attainment of steady-state conditions in the removal of dissolved organic carbon (DOC). Notably, two columns loaded with seeded GAC at food-to-microorganism (F/M) ratios of 0.8 and 0.4 reached steady-state after 4801 (50 days) and 7202 (75 days)-bed volumes (BVs), respectively, while the control required 19 206 (200 days) BVs. The seeded systems showed a higher reduction in the DOC, decreasing from 6.4 to 2 mg L⁻¹ (∼68%), meeting the USEPA DOC recommendation for drinking water. Other studies reported <50% reduction in the DOC after operating for 200 days. Additionally, NH₄-N and NO₃-N were lowered from 1.6 to 0.5 mg L⁻¹ and 5.2 to 2.6 mg L⁻¹, respectively. At a contact time of 15 min, 12 out of 17 ECs showed >70% removal, while the remaining 5 ECs showed >60% removal. A fluorescence–PARAFAC model was used to investigate the DOC removal mechanism by the BAC filters. These filters effectively reduced the total coliforms by >1.5 log₁₀ and strengthened the relationship between the functional enzymes, key metabolic pathways, and contaminant removal. Extracellular polymeric substances (EPS) from BAC were characterized to provide mechanistic insights into the enhanced attenuation of ECs.

117. 题目: Microbial Processing and Mineral Stabilization of Organic Matter in Iron Ore Tailings: A Four-Year Microcosm Study via Isotopic Labeling and Submicron-Scale Analysis.
文章编号: N26012905
期刊: Environmental Science & Technology
作者: Songlin Wu, Zhen Li, Fang You, Wei Fu, Qi Feng, Guanghui Yu, Cheng-Wei Kao, Ting-Shan Chan, Baodong Chen, Gordon Southam, Longbin Huang
更新时间: 2026-01-29
摘要: Microbial utilization and formation of organic matter (OM) are key driving processes in the eco-engineered pedogenesis in iron (Fe) ore tailings, underpinning sustainable ecological rehabilitation. This four-year microcosm study aimed to unravel the mechanisms of relatively long-term OM transformation and stabilization subject to microbial processing in the OM amended Fe-ore tailings. The method of isotopic tracing (13C-glucose and 13C/15N-labeled spring wheat biomass) and a high-resolution Orbitrap mass spectrometry and nanoscale secondary ion mass spectrometry (NanoSIMS) were employed to characterize molecular composition of OM and organo-microbial-mineral interactions in the resultant tailings technosol at the submicron scale. It was revealed that both soluble (i.e., glucose) and solid (plant biomass) OM used to amend tailings for soil formation generated a diverse range of molecules, including protein-, lipid-, and lignin-like compounds. These organics were predominantly stabilized by Fe- and Al-rich minerals heterogeneously. Meanwhile, microbial 14N2 fixation was observed in tailings primed with 13C-glucose, resulting in microbial OM enriched with 13C and 14N. A dynamic OM turnover in the tailings amended with 13C/15N-labeled spring wheat biomass was observed, which was characterized by the decrease of exogenous 13C/15N and the emergence of organic compounds containing atmospheric sources of 12C/14N. These microbial and mineral-mediated OM formation and stabilization processes indicate the emergence of developing soil ecological resilience, indicated by in situ microorganism-driven C/N biogeochemistry in the initially OM-amended tailings.

118. 题目: Solar-driven degradation of HEDP and simultaneous phosphorus recovery from electroplating wastewater via a Cu (III)-mediated biochar electro-Fenton system
文章编号: N26012904
期刊: Chemical Engineering Journal
作者: Shibo Zhao, Yanping Cui, Qiao Huang, Xian Xiang, Yuqing Qu, Chu Xiong, Bolin Li, Caixia Wen
更新时间: 2026-01-29
摘要: The pervasive and highly stable organophosphate, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) in electroplating wastewater poses a significant challenge to conventional treatment due to its recalcitrant nature. Herein, we report a novel, solar-driven electro-Fenton (EF) system for the efficient degradation of HEDP and simultaneous recovery of phosphorus. This system uniquely features an apricot shell biochar-modified graphite felt (BCGF) cathode, which facilitates in-situ H2O2 generation. Crucially, the process synergistically activates trace endogenous Cu(II) (0.02 mmol/L) within the wastewater, promoting the generation of the highly potent oxidant, Cu(III), for HEDP degradation. Under optimized conditions (50 °C), the system achieved 97.6% HEDP removal within 60 min. Mechanistic investigations revealed that elevated temperatures (from 10 °C to 50 °C) accelerated the Cu(I)/Cu(III) redox cycle, further enhancing degradation efficiency. The BCGF cathode exhibited exceptional stability, maintaining high performance over 30 consecutive cycles. Entirely driven by solar energy, the system achieved over 94% HEDP removal in 60 min, presenting a sustainable and cost-effective strategy for treating persistent organophosphorus pollutants and valorizing waste resources. Solar-Driven Cu(II)/BCGF system also demonstrated excellent performance in treating complex simulated electroplating wastewater, achieving an 84.7% degradation rate of 1761 mg/L (8.55 mmol/L) HEDP within 7 h.

119. 题目: Dissolved organic matter influences the activation and release risks of arsenic and thallium in mine stream sediments
文章编号: N26012903
期刊: Journal of Hazardous Materials
作者: Jie Cao, Zhaohui Guo, Jianhong Liang, Haolin Jia
更新时间: 2026-01-29
摘要: Dissolved organic matter (DOM) is widely distributed in sediments, however its potential effects on heavy metals at mine area remain insufficiently investigated. This study focused the influence of DOM on the activation and release of arsenic (As) and thallium (Tl) from mine-impacted sediments. Results showed that DOM governs the spatial heterogeneity, mobilization dynamics, and associated health risks of heavy metals in mine sediments. As and Tl concentrations in mine stream sediments significantly exceeded local background levels, and their spatial distributions exhibited a strong positive correlation with DOM. With increasing of DOM concentrations and more labile, microbially derived components collectively elevated, the concentrations of activated As and Tl increased by 144% and 221%, respectively. DOM accounts for over 99% of the spatial variance of activated As and Tl through reductive dissolution of iron oxides, release proton or direct complexation while its molecular composition governs As and Tl mobility and associated health risks. The protein-like and fulvic acid-like DOM increased both short-term hazards and long-term carcinogenic risks above safety thresholds. Fulvic acid-like DOM mobilized As, while protein-like DOM co-released As and Tl. Fulvic acid-like DOM uniquely enhanced As(III) mobility while most effectively suppressing Tl(III) solubility. This study clarifies the DOM for the release of As and Tl in sediments at mine area, providing a scientific basis for heavy metals risk assessment and control in mine.

120. 题目: Contribution mechanism of dexamethasone natural attenuation in rivers via intertwined photolytic-biological degradation: DOM-driven photolysis, microbial responses, and QSTR-RQ model-based risk assessment
文章编号: N26012902
期刊: Journal of Hazardous Materials
作者: Yuqi Zhuang, Sinuo Li, Eldon R Rene, Weifang Ma
更新时间: 2026-01-29
摘要: In order to clarify the reasons for continuous accumulation of glucocorticoids as dexamethasone (DEX) in urban rivers, a microcosm simulation system was set up to analyze the natural attenuation behavior, intrinsic decay mechanism, and environmental risk elevation driven by multiple intertwined degradation pathways. The half-life of DEX was 13.6 days even with synergistic degradation from multiple effects of photolysis, biodegradation, and hydrolysis, with degradation rates enhanced 3.40, 8.88, and 347.76 times than individual photolysis (46 d), biodegradation (120 d) or hydrolysis (4,715 d). Therefore, the residue DEX was 9.17% even after 50 days, which explained DEX accumulation in rivers under constant external input scenario. Moreover, these intertwined multi-pathway degradation network that stemmed from the interconversion of intermediates from different pathways increased toxicity risk due to dissolved organic matter (DOM) driven photolysis. DOM exhibited concentration-dependent dual effects on indirect photolysis in the 5~15mgC/L range, with the strongest promotion at 10mgC/L. Contributions of reactive species followed 3DOM* >1O2 >•OH, which induced the accumulation of highly toxic intermediates via indirect photolysis-dominated pathway. Long-term exposure to DEX and metabolites led to microbial community structure shift toward tolerant genera capable of utilizing DEX, with genera as the hgcI clade, Myroides, and Acinetobacter being dominant at day 25, shifting to C39 and Polynucleobacter by day 50. QSTR model-based ecological risk assessment presents risk level increased 2.67 and 3.23 times after 25 and 50 days. These results elucidated DEX's accumulation and elevated degradation-derived risks in natural rivers.