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61. 题目: Ultrafiltration membrane fouling mitigation mechanism induced by algal and natural organic matters: Dependence of photocatalysis pre-oxidation degree and membrane properties
文章编号: N25071108
期刊: Water Research
作者: Luming Ding, Zhiwei Zhou, Chunjiao Liu, Yanling Yang, Xing Li, Jiawei Ren, Haiqing Chang
更新时间: 2025-07-11
摘要: Ultrafiltration (UF) membrane fouling induced by algal and natural organic matters (AOM-NOM) is a challenging issue in drinking water treatment. AOM-NOM removal was evaluated using a process combining Bi₂O₃-TiO₂/PAC (Bi-doped TiO₂ nano-composites supported by powdered activated carbon) photocatalysis with UF, and fouling mitigation effectiveness and mechanisms of the process for ceramic and polyethersulfone membranes were elucidated. The optimal photocatalytic duration for AOM-NOM removal and membrane fouling mitigation was 90 min. Ceramic membranes exhibited superior performance in dissolved organic carbon (DOC) (65.78%), UV₂₅₄ (96.06%) and fluorescent components removal (97.46% and 96.71% for components 1 and 2). The process enhanced AOM-NOM fractions’ removals except for low-molecular-weight neutral organics. Polyethersulfone membranes demonstrated a pronounced lower membrane fouling by photocatalysis, and the reversible fouling observed in AOM-NOM was primarily attributed to protein-like substances. Moderate photocatalysis induced specific blocking models that inhibited cake layer formation. Moreover, AOM-NOM removal reduced the adhesion free energy between membranes and foulants. The absolute values of total interfacial free energy decreased from 64.13 and 53.24 mJ/m² to 35.14 and 17.66 mJ/m² for ceramic and polyethersulfone membranes, respectively. These mechanisms synergistically attenuated membrane fouling propensity. This study provides technical support for applications of photocatalysis-UF process in advanced treatment of algae-laden water.

62. 题目: Organic Carbon Sequestration by Secondary Fe-Mn Complex Minerals via the Anoxic Redox Reaction of Fe(II) and Birnessite.
文章编号: N25071107
期刊: Environmental Science & Technology
作者: Shiwen Hu, Hanyue Zhang, Yang Yang, Pei Wang, Zecong Ding, Guojun Chen, Shan Wang, Kuan Cheng, Chao Guo, Xiaomin Li, Tongxu Liu
更新时间: 2025-07-11
摘要: Organic matter (OM) sequestrated by iron (Fe) and manganese (Mn) complex minerals may be an effective way to achieve organic carbon (OC) persistence in sediments and soils. However, the impact of Fe-Mn complex minerals from a redox reaction of Fe(II) and birnessite on OC dynamics remains unexplored. Herein, the immobilization and molecular transformation of fulvic acid (FA), mediated by a redox reaction of Fe(II) and birnessite, were investigated at pH 4.0-8.0 with 1-5 mM Fe(II). Higher pH and Fe(II) addition promoted Fe(II) oxidation coupled with the reductive transformation of birnessite. The coupled adsorption-oxidation of FA occurred, and FA sequestration efficiency increased with a decrease in pH and increasing Fe(II) concentrations. Fe(II) oxidation primarily formed ferrihydrite, and a small portion of lepidocrocite and feitknechtite was detected under higher pH and Fe(II) addition conditions. In mineral-organo composites, Fe/Mn-O, Fe-C, edge- and corner-sharing Fe-Fe, and Mn-Mn bonds constituted the coordination environment. FA was associated with Fe-Mn complex minerals to improve its stability, while C in FA distributed within nanopores and thin coaggregates exhibited a higher oxidation state. Compounds with high molecular weight, O/C, and aromatic and unsaturated structures, predominantly composed of lignin, tannin, and condensed hydrocarbons, exhibited stronger binding to Fe-Mn complex minerals under lower pH and higher Fe(II) addition conditions. These findings provide a fundamental understanding of heterogeneous Fe-Mn complex mineral formation coupled with OM sequestration, which has significant implications for understanding the long-term cycling of Fe, Mn, and C in natural settings.

63. 题目: Microbial-mediated transformation shapes the molecular diversity of landfill leachate under anthropogenic and natural covariation
文章编号: N25071106
期刊: Water Research
作者: Qiurui Zhang, Jitao Lv, Shiyang Yu, Tianyu Chen, Yue Sun, Feifei Li, Lu Bai, Xianwei Wang, Xiaosong He, Yong Nie, Nanwen Zhu, Yawei Wang, Guibin Jiang
更新时间: 2025-07-11
摘要: Extensive landfill leachate from human activities is one of the most intractable liquid waste due to the presence of stubborn leachate dissolved organic matter (LDOM) and various pollutants. However, critical driving forces regarding LDOM complexity are still unclear. This study explores relationships between LDOM chemical composition, microbial community, anthropogenic factors and climate conditions based on national-scale landfill leachates in China. The results indicate that although landfill wastes originate from human emissions, microbes dominate molecular composition diversity of LDOM, followed by climate. To further elucidate the interlink between LDOM diversity and microbial communities, a two-stage network framework is established: first constructing molecular transformation networks to clarify humification and mineralization of LDOM, succeeded by building an interaction network that links definable reactions to microbial communities. Network analyses reveal that microorganisms promote accumulation of recalcitrant components in LDOM, weakening human-induced differences. Amino acid metabolism was particularly prominent in microbial-mediated transformation of LDOM, and the potential keystone microbial species are identified. This study deepens the understanding of the evolution of organic matters in landfills, also provides a new paradigm for exploring microbial mediated molecular transformation of DOM in both artificial and natural waters.

64. 题目: Pathways and selectivity of Fenton degradation of different precursor species of dissolved organic matter
文章编号: N25071105
期刊: Nature Communications
作者: Qi Chen, Fan Lü, Junjie Qiu, Hua Zhang, Pinjing He
更新时间: 2025-07-11
摘要:

Fenton has become one of the dominant technologies for the treatment of recalcitrantly degradable wastewater. Fenton reaction inevitably generates massive amounts of secondary dissolved organic matter (DOM). However, the pathways and selectivity of reaction remain unclear when Fenton is applied in a complex environmental system with different DOM molecules. Here, we design five levels of Fenton reactions based on typical precursor monomers of different DOM species and their stable isotope-labeled monomers combined with actual DOM media. The molecular information of the Fenton-derived DOM for all reactions is obtained based on ultra-high resolution mass spectrometry. The exact mass difference calculations demonstrate that Fenton degrades eight DOM precursor species by different pathways. The temporal gradient changes in the co-molecular characteristics of the Fenton-derived DOM between individual monomer reactions and gradient mixed monomer reactions confirm Fenton degradation selectivity toward eight DOM precursor species. These findings may provide a theoretical basis for using the Fenton process in the targeted degradation of organics.

65. 题目: Responses of riverine dissolved organic matter to damming in two distinct hydrological regimes in northern Spain
文章编号: N25071104
期刊: Biogeosciences
作者: Selin Kubilay, Edurne Estévez, José Barquín Ortiz, Gabriel Singer
更新时间: 2025-07-11
摘要: . Iberian rivers are characterized by flow regimes with high seasonal flow variation. They also host one-fifth of Europe's reservoirs for hydropower generation, irrigation, or water supply needs, and thus many rivers in this region have heavily altered flow regimes. Such flow conditions also alter the natural dynamics of dissolved organic matter (DOM), which likely has implications for carbon cycling due to changed conditions for the transformation, transportation, production, and storage of carbon. Here we looked into the effects of flow alteration on the DOM regime, i.e. the seasonal variation in DOM concentration and composition, in 20 rivers belonging to two different natural (reference) flow regimes (i.e. Mediterranean and Atlantic) in northern Spain. To further investigate which flow regime components influence DOM properties, we linked the observed seasonal shifts in DOM composition to a range of hydrological indices. We found that Atlantic rivers with a natural flow regime tended to have lower annual mean dissolved organic carbon (DOC) concentrations than their altered equivalents; this flow alteration trend is weakly mirrored in Mediterranean rivers. We did not observe much difference in annual average DOM composition due to flow alteration in either Atlantic or Mediterranean rivers. However, the seasonal variation in DOM composition was lower in altered Atlantic rivers compared to natural ones. This flow alteration effect on the DOM regime was not as distinctive in Mediterranean rivers, which showed a higher diversity of DOM regimes across rivers. We linked the lack of seasonal variation in DOM composition in flow-altered rivers mainly to the prevention of transmission of upstream-sourced DOM from the reservoirs. It appears that in our study area, reservoirs mostly act as a temporally homogenizing buffer, averaging out naturally occurring shifts in DOM composition by transiently storing upstream-sourced carbon inputs and subjecting them to bio- and photo-degradation, thus sending relatively invariable amounts of DOM further downstream. This effect of dams on DOM regimes appears robust across both Atlantic and Mediterranean regimes despite some heterogeneity of dam types and purposes, with potentially important consequences for riverine carbon cycling.

66. 题目: Enhanced ozone catalytic treatment of mature landfill leachate with low C/N ratio using transition metal-modified biochar
文章编号: N25071103
期刊: Journal of Environmental Chemical Engineering
作者: Haonan Qi, Bo Gao, Jiadong Liu, Zhuonan Wang, Mika Sillanpää
更新时间: 2025-07-11
摘要: The treatment of mature landfill leachate poses notable challenges due to the inhibitory effect of high NH₄⁺-N concentrations on microbial nitrification. In this study, an innovative internal circulation system was developed by coupling enhanced catalytic ozonation using transition metals (Fe, Co, and Ni) loaded biochar derived from residual sludge with a membrane bioreactor (MBR) for effective leachate treatment. The incorporation of Ni remarkably altered the biochar structure, yielding an ID/IG value of 1.24 and creating more defect sites and disordered edges, which facilitated the generation of hydroxyl radicals (·OH), superoxide radicals (·O₂^-), and singlet oxygen (¹O₂). Parallel factor analysis (PARAFAC) indicated that the humification index (HIX) decreased from 0.79 to 0.39 during the treatment process, proving that the humus substances in the leachate were effectively degraded. The Shannon index of microorganisms decreased from 3.97 to 3.42, and the Shannoneven decreased from 0.78 to 0.67, which indicated that the microorganism diversity in the MBR unit increased and the uniformity decreased after the internal circulation reaction system. The Bacteroidetes and Proteobacteria played a key role in the removal of NH₄⁺-N and organic matter. After 25 days of operation, MBR-ozone-catalyzed internal circulation system achieved 99.6% NH₄⁺-N removal with concentration decreasing from 1952 mg/L to 8.8 mg/L, and 96.9% COD removal by decreasing from 698 mg/L to 21.5 mg/L, which demonstrated the synergistic effect of the biochemical system and the catalytic system. This study provided a substantial step forward for solving the difficult problem for the treatment of mature landfill leachate containing high NH₄⁺-N.

67. 题目: Effects of nano-selenium addition on the nitrogen cycle during composting: Mechanistic regulation of denitrification and organic nitrogen metabolism.
文章编号: N25071102
期刊: Journal of Environmental Management
作者: Zaiguang Hou, Xiaojiang Ma, Muqing Zhan, Haochen Shao, Qianting Zhuo, Xi Chen, Sanwei Yang, Chen Fang
更新时间: 2025-07-11
摘要: Nano-selenium organic fertilizers are a key component in building selenium-enriched functional agriculture, but the impact of nano-selenium addition on nitrogen transformation during composting remains poorly understood. In this study, 0 μg/kg (CK), 75 μg/kg (Se_L), 150 μg/kg (Se_M), and 300 μg/kg (Se_H) nano-selenium were added to cattle manure to investigate the effects on different nitrogen metabolic pathways. The results show that organic nitrogen metabolism and denitrification are major pathways by which aerobic composting microorganisms participate in the nitrogen cycle. Nano-selenium significantly upregulated the gltB gene expression during the thermophilic phase and inhibited ammonium-nitrogen (NH4+) accumulation by promoting L-glutamate synthesis. The NH4+ contents in the Se_M and Se_H groups were 0.21 g/kg and 0.43 g/kg lower than in the CK group at the end of composting (p < 0.05). The medium concentration of nano-selenium favored a reduction in the synergistic effects among nitrogen metabolic functions. The downregulation of nirK and upregulation of the remaining denitrification genes in the Se_M group improved the nitrate-to-nitrogen conversion and effectively reduced nitrous oxide (N2O) emissions. After three days of composting, the N2O emissions from the Se_M group were only 36.46 % of that in the CK group (p > 0.05). In conclusion, adding appropriate concentrations of nano-selenium to the aerobic composting process of cattle manure is an effective strategy to regulate the nitrogen cycle and reduce the accumulation of NH4+ as well as gaseous nitrogen losses.

68. 题目: Fractionation of humic acid and their effects on the photodegradation of amitriptyline in water
文章编号: N25071101
期刊: Environmental Science: Processes & Impacts
作者: Zhiwen Li, Hui Liu, Tie Li, Xiaoxia Ou, Kaixuan Wang, Bing Sun
更新时间: 2025-07-11
摘要: Humic acid (HA) plays a critical role in pollutants’ photolysis, but due to its structural complexity, it is difficult to identify structural features with high photocatalytic activity. Herein, HA was fractionated on a silica gel column to get three fractions, i.e. FA, FB and FC, according to the polarity. After grading, humic- and fulvic- like components were enriched, while protein-like component with relatively small molecular weight was lost. Among the three fractions, the strongest polarity FA is rich in carboxyl, with a low formation rate of ·OH but a high quantum yield of excited triplet state (3HA*). FB has the strongest aromaticity and the highest formation rate of 3HA*. FC with weaker polarity is rich in aromatic proteins, and has a high quantum yield of 3HA* and ·OH. All HA fractions promoted the photodegradation of amitriptyline (AMT), and the promotion effect of bulk HA and FB was greater than FA and FC, and the 3HA* and ·OH were the main active species. Products analysis indicated that the electron transfer of AMT and 3HA* and subsequent hydroxylation were the main reaction pathways. HA fractions generated reactive halogen species (RHS) through 3HA* in the present of halides, which obviously promoted AMT decomposition, and the role of RHS was significantly correlated with the quantum yield of 3HA*. Under the presence of Fe3+, HA promoted AMT degradation by forming a complex of Fe-HA. This study is helpful for better understanding the relationship between the structure properties and photochemical activity of different fractions of HAs

69. 题目: Plastispheres as unique niches for promoting turnover of dissolved organic matter in aquatic environments
文章编号: N25071012
期刊: Water Research
作者: Yan-Jun Liu, Zheng-Hao Li, Yan-Yun Hu, Jia-Heng Zhao, Li Yuan, Guo-Ping Sheng
更新时间: 2025-07-10
摘要: Plastic debris has been found to be ubiquitous in aquatic ecosystems, providing a novel substrate for biofilm formation called the plastisphere. Existing surveys mainly focus on the fact that this novel niche serves as a reservoir for environmental contaminants, whereas the potential role of the plastisphere in affecting biogeochemical cycles of aquatic dissolved organic matter (DOM), one of the largest pools of active carbon, remain largely unknown. Herein, we conducted in-situ field incubation and lab-scale microcosm experiments using river water as background, investigating the variation and underlying mechanisms of riverine DOM composition under plastisphere incubation at molecular level. Microcosm experiments showed that DOM content in water after plastisphere incubation significantly increased compared with that in the control group. Spectroscopy and ultrahigh-resolution mass spectrum further revealed that plastisphere distinctly accelerated the DOM transformation from labile-active components to recalcitrant-inactive molecules compared with natural biofilm, potentially contributing to riverine refractory DOM pool. Furthermore, the shifted microbial community (e.g., Proteobacteria and Acidobacteria) and functional gene abundance (e.g., carbon degradation/fixation and organic nitrogen/phosphorus mineralization) related with DOM transformation regulated by plastisphere were identified as main inherent mechanisms. Therefore, the prevalent plastisphere may alter the aquatic microbial functions, and consequently expedite the turnover of organic carbon and reshape DOM chemodiversity. These findings pinpoint plastisphere as a potential source and distinctive shaper for aquatic DOM, providing new insight into roles of this unique biotope in elemental biogeochemical cycling.

70. 题目: Effect of far UVC pretreated dissolved organic matter on volatile disinfection byproducts abatement in real surface water disinfection process: Implications from non-targeted high-resolution mass spectrometry and interpretable machine learning
文章编号: N25071011
期刊: Water Research
作者: Pengcheng Huang, Honglie Wang, Qiyuan Sun, Feifeng Wang, Guanghui Guo, Xiaoyan Wang
更新时间: 2025-07-10
摘要: Ultraviolet (UV) pretreatment can alter the molecular components of dissolved organic matter (DOM) in raw water, thereby influencing the formation potential of disinfection byproducts (DBPs) during free chlorine disinfection of drinking water treatment. This study systematically evaluated the effect of four representative wavelengths of UV irradiation (including far UVC) on DOM components transformation and DBPs formation in real surface water. By combing Fourier transform-ion cyclotron resonance mass spectroscopy (FT-ICR MS) with interpretable machine learning, the key molecular features and phototransformation pathways responsible for DBP precursor behavior under UV irradiation were effectively identified. The results demonstrated that all the four types of UV irradiation promoted DOM transforming from high molecular weight (MW) and aromatic components to low MW and saturated one, which easily reacted with bromide ions and free chlorine to generate bromine-chlorine mixed DBPs. Notably, UV₂₂₂ and UV₂₅₄ tended to decompose nitrogen- and sulfur-containing components of DOM and reduce their reaction pathways, resulting in a lower yield of nitrogenous DBPs (N-DBPs). By contrast, UV₃₁₀ and UV₃₆₅ preferred to degrade DOM components with high H/C, resulting in a high dose of carbon-containing DBPs (C-DBPs). The inhibitory effect of UV₂₂₂ pretreatment on the formation of trichloronitromethane was lower than that of UV₂₅₄, which could attribute to its lower capability on reducing number of chlorination reaction pathway of aromatic compounds in DOM. Nonetheless, the calculated toxicity of volatile DBPs was lower in chlorinated UV₂₂₂-pretreated waters than in chlorinated raw water, indicating that UV₂₂₂-pretreatment had positive effect on DBPs abatement. These findings provide practical guidance for selecting specific wavelength UV pretreatment strategies to minimize DBPs formation. This work also expands current knowledge by demonstrating the mechanistic differences in DOM phototransformation and DBPs generation across multiple UV wavelengths, advancing the field toward more targeted and efficient disinfection control strategies.

71. 题目: Identification of a surface protein in the extracellular polymeric substances of seawater-adapted aerobic granular sludge
文章编号: N25071010
期刊: Water Research
作者: Le Min Chen, Tessa Hofstra, Jelle Langedijk, Sebastian Andrei, Martin Pabst, Mario Pronk, Mark C M van Loosdrecht, Yuemei Lin
更新时间: 2025-07-10
摘要: Identifying structural proteins within the extracellular polymeric substances (EPS) will provide a better understanding of the stability of aerobic granular sludge and biofilms in general. In this work, an abundant surface protein was identified and localized in the extracellular matrix of seawater-adapted AGS. Granules with good phosphate removal were cultivated in a sequencing batch bubble column reactor with acetate as a carbon source dissolved in seawater. “Candidatus Accumulibacter” was observed as the most dominant community member through fluorescent in-situ hybridization. A surface protein of 74.5 kDa was identified in the EPS extract of the seawater-adapted AGS by SDS-PAGE and mass spectrometry. The surface protein was produced by an Accumulibacter species and showed homology to S-layer proteins. A type 1 secretion system was found adjacent to the gene encoding for the surface protein, suggesting a possible export system. Antibodies generated from a unique peptide of the surface protein confirmed the extracellular location of the surface protein. Microscopy observations with antibody staining showed the surface protein forms dense structures within the Accumulibacter microcolonies and larger fiber structures around the microcolonies. These observations highlight the importance of the protein for the structural properties of the granule. To detect more structural proteins in the EPS, optimization of the EPS extraction and in situ imaging validation methods are essential.

72. 题目: Promotion of Fungal Bioactivity by Extracellular Polymeric Substances Under Phosphorus Deficiency
文章编号: N25071009
期刊: Environmental Microbiology
作者: Shang Pan, Yizhou Jiang, Shihui Yan, Meiyue Xu, Yuyang Cao, Haoyang Weng, Zhijun Wang, Yixiao Shi, Zhen Li
更新时间: 2025-07-10
摘要: Extracellular polymeric substances (EPS) can work as a highly efficient nutrient source for many microorganisms. This study investigated the influences of EPS on the bioactivities of a typical phosphate‐solubilising fungus, that is Aspergillus niger. The EPS were extracted from Rhodotorula mucilaginosa, with the addition of varying levels of inorganic phosphates. Under phosphorus (P) limitation, the cell wall thickness of A. niger increased from ~0.2 μm to ~0.4 μm. The addition of EPS relieved this phenomenon under the stress. In addition, it showed that EPS significantly promoted microbial growth with a four‐fold increase in microbial biomass. For the treatment with the addition of sole inorganic phosphate, A. niger primarily secreted oxalic acid for phosphate solubilisation. However, for the treatment with sole EPS, the secretion of oxalic acid was inhibited, while the activity of acid phosphatase was promoted. Moreover, the concentration of oxalic acid was significantly reduced from approximately 90 to 1 mg/L during the co‐existence of inorganic phosphate and EPS. Meanwhile, the activity of acid phosphatase was also enhanced. Therefore, A. niger can balance its strategy of P solubilisation, depending on the types of P sources. Furthermore, EPS was preferentially utilised over inorganic phosphate. Our findings highlight the potential of EPS for sustainable P supply.

73. 题目: Application of molecular docking in sorption of hydrophobic organic contaminants on black carbon
文章编号: N25071008
期刊: Science of the Total Environment
作者: Tian Liang, Nannan Wan, Yan-Rong Zou, Xuan Kou, Zhao-Wen Zhan, Ping'’an Peng
更新时间: 2025-07-10
摘要: This study explored the mechanism and environmental significance of hydrophobic organic contaminants (HOCs) sorption by black carbon samples (BCs) using a newly developed molecular structure establishment method and the latest molecular docking technology. BCs of different evolution stages were prepared based on low maturity kerogen. Total of 70 types of HOCs molecules were selected, including alkanes, cycloalkanes, polycyclic aromatic hydrocarbons, and their derivatives, as ligands to perform docking studies using five different BCs molecular models. Based on the Gibbs free energy distribution between HOCs and BCs obtained by docking calculation, the capacity of sorption was deduced. The results showed that the molecular weight, methyl content, and condensation degree are the three main factors affecting the sorption ability of HOCs on BCs, and aromatic compounds have remarkable advantages in sorption, following the order of aromatic compounds > cycloalkanes > alkanes. It is worth noting that in order to ensure the correctness of molecular docking technology in the inference of adsorption capacity, we carried out the adsorption experiments of BCS with eight organic reagents. The experimental results are highly consistent with the calculated results, which not only proves the feasibility of this technology, but also shows that the intermolecular force represented by Gibbs free energy is closely related to the capacity of sorption. This study establishes a novel approach to elucidate contaminant-macromolecule interactions, enabling prediction of HOCs environmental behavior and evaluation of BCs' sequestration potential. The method enhances experimental efficiency for multiphase pollutant sorption studies, proving particularly advantageous for preliminary screening. Importantly, it allows safe investigation of toxic/volatile compounds while ensuring researcher safety.

74. 题目: Molecular insights into the enhanced water purification of algal-rich water by in-situ ozonation/manganese-doped ceramic membrane process
文章编号: N25071007
期刊: Separation and Purification Technology
作者: Jingyi Zou, Yanjun Li, Tianhao Tang, Yuepeng Deng, Kai Yang, Yulong Yang, Shengyin Tang, Xihui Zhang
更新时间: 2025-07-10
摘要: Harmful algal blooms significantly increase algae-derived organic matter (AOM) and algal toxins in surface waters, posing serious threats to aquatic ecosystems and public health. This study employed an integrated in-situ ozonation/manganese-doped catalytic ceramic membrane (Mn-CM) process to effectively purify algal-rich water. The effect of ozone dosage and the molecular-level mechanisms of organic contaminants removal were systematically investigated. Compared to sole ozonation or sole Mn-CM processes, the integrated process exhibited enhanced performance, achieving removal efficiencies of 22.56 % for dissolved organic carbon (DOC) and 92.05 % for microcystin-LR (MC-LR) at an ozone dosage of 1.0 mg/L. Results from Fourier-transform ion cyclotron resonance mass spectrometry and machine learning revealed the integrated process notably promoted the oxidative removal of unsaturated compounds with low O/C and high N/C ratios, mainly via oxygen addition, dealkylation and deamination reactions. MC-LR was more efficiently removed than DOC, predominantly due to its greater unsaturation, lower O/C and higher N/C ratios relative to raw AOM. Moreover, the integrated process facilitated oxidation of MC-LR into less toxic byproducts. These findings offer a theoretical basis for the future development and practical application of this integrated approach in real algal-rich water treatment.

75. 题目: Engineered biochar-attapulgite clay composite: A novel slow-release phosphorus fertilizer
文章编号: N25071006
期刊: Chemical Engineering Journal
作者: Harleen Kaur, Gurwinder Singh, Marjana Yeasmin, Kavitha Ramadass, Puspamitra Panigrahi, Alan Larson, Ranjit Pati, Dane Lamb, Bo Zheng, Ehsan Tavakkoli, Lukas Van Zwieten, Ajayan Vinu
更新时间: 2025-07-10
摘要: Sustainable agricultural practices are in high demand, and the development of innovative materials for slow nutrient release holds utmost importance. Phosphorus (P) stratification limits plant P availability in no-till farming systems. To address this, a nano composite-based P fertilizer to release nutrients in the root zone following surface soil application is constructed. The nanocomposite fertilizers (BAP-SRFs) were formed by a combination of different amounts of biochar (BC), attapulgite clay (ATP) and KH₂PO₄, followed by a high-temperature treatment (500 °C). XANES analysis revealed the enrichment of the surface with carbon (C), oxygen (O) and P-containing functional groups, and the bond formation of P with calcium (Ca) and magnesium (Mg) and organic C. Batch desorption and dynamic release experiments provided conclusive evidence that an interplay between ATP and P contents is crucial for the optimum delivery of P in both aqueous and soil media. The slowest release of P in water was achieved in BAP-SRF, which had a BC to ATP ratio of 2 and was loaded with 200 mg of KH₂PO₄. Pseudo-second-order kinetics presented the best fit for P release, demonstrating that the release mechanism of P is primarily based on diffusion. The visual diffusion of P in soil provides critical evidence of the slow-release nature of the BAP-SRFs as compared to commercial single super phosphate. The experimental findings were further corroborated by the first principles density functional theory calculations, which highlighted that BC and ATP make an excellent combination to interact with the KH₂PO₄ and slow down its release. The engineered nanocomposite P fertilizers developed here may provide a solution for the intractable issue of P stratification in no-till farming systems.

76. 题目: Field-validated Mg-biochar balls: In-situ nutrient recovery from Paddy runoff and compost enhancement for economic benefits
文章编号: N25071005
期刊: Chemical Engineering Journal
作者: Xinyue Lu, Lisha Wang, Xiaolong Sun, Wenjing Guo, Aiguo Sha, Yuanyuan Feng, Yanfang Feng, Lihong Xue
更新时间: 2025-07-10
摘要: Nitrogen and phosphorus are essential nutrients for all living organisms; however, excessive application of fertilizers has led to significant agricultural non-point source pollution. The recovery of these nutrients is critically important, particularly in light of the global scarcity of phosphorus resources. Hence, this study presents field-validated Mg-biochar balls (Mg-BCB) for in-situ nutrient recovery from paddy runoff and compost-driven economic gains. Biochar powder prepared by co-precipitation of MgCl₂ and KOH was granulated into Mg biochar balls (Mg-BCB), Mg-BCB demonstrated efficient NH₄⁺(20–27 %), NO₃⁻ (37–41 %), and total phosphorus (TP, 33–50 %) removal via ligand binding and surface precipitation in farmland ditches. The nitrogen and phosphorus saturated Mg-BCB (Mg-BCB-N/P) was repurposed as a composting additive, increasing total nutrient content by 30.82 % through lowered pH and higher composting temperatures to enhance microbial activity. Simulation analysis suggested Mg-BCB could recover 62 % of exogenous N/P inputs in Taihu Lake basin, projecting environmental economic profits of 206.35 RMB t⁻¹ of Mg-BCB, with Yixing City estimated to attain 2.81 × 10⁶ RMB annual benefits. The closed-loop strategy not only mitigates eutrophication but also converts non-points source pollutants into agricultural resources, addressing phosphorus scarcity while delivering scalable economic returns.

77. 题目: Efficient phosphate adsorption from real industrial wastewater using Fe/La-impregnated biochar
文章编号: N25071004
期刊: Journal of Environmental Chemical Engineering
作者: Wenjing Nie, Xiaoya Zhang, Xianxin Luo, Luya Xie, Yanqing Zhu, Aiping Tang, Donghui Liang
更新时间: 2025-07-10
摘要: Recovery of phosphate from industrial wastewater offers dual benefits of contaminant mitigation and resource recycling, attracting growing attention in environmental research. Herein, a tree bark-derived Fe/La-loaded biochar composite (Fe/La@BC) was synthesized via pyrolysis, demonstrating efficient phosphate adsorption. Notably, Fe/La@BC retained its stable phosphate removal across a broad pH range (2.0–12.0) and high NaCl salt concentrations (up to 0.62 mol/L), achieving removal efficiencies of 99.11 ± 2.09% and 93.75 ± 6.33%, respectively. Moreover, the sorbent also exhibited efficient performance in remediating real phosphorus-containing industrial cleaning wastewater, yielding a removal efficiency of 94.56 ± 1.92% and an adsorption capacity of 44.12 ± 1.15 mg-P/g. Kinetic and isotherm investigations revealed that the adsorption followed pseudo-first order kinetics (k = 0.05 min^-1) and the Langmuir isotherm model (q_max = 74.60 mg/g), implying dominant monolayer adsorption on a homogeneous surface. Thermodynamic studies showed the process was spontaneous and exothermic, with minimal temperature dependence. FTIR, XRD, and XPS characterizations confirmed that metal sites—especially lanthanum—facilitated phosphate adsorption through the formation of inner-sphere complexes, corroborated by the identification of LaPO₄ as the reaction product. These findings highlight Fe/La@BC composites as an effective and adaptable material for phosphate recovery from real phosphorus-laden industrial wastewater, offering a promising strategy for sustainable phosphorus management.

78. 题目: Freeze-thaw and dry-wet alternation regulate the impacts of Fe-C based passivator on soil heavy metals immobilization
文章编号: N25071003
期刊: Journal of Environmental Chemical Engineering
作者: Yuliang Zhang, Pingfeng Fu, Sheng Li, Wei Deng, Shan Li, Wen Ni, Siqi Zhang
更新时间: 2025-07-10
摘要: Soil passivators can effectively reduce the risk of heavy metals migration in contaminated soil and are widely used for mining soil remediation. The long-term stability of heavy metals by passivators on soil and their transformation mechanisms in unstable and extreme climatic conditions remain largely unexplored. Here, the long-term immobilization effect of As, Sb and Pb in mining soil by Fe-C based passivators was investigated through freeze-thaw (FT) and dry-wet (DW) aging processes. The results revealed that the immobilization effect of As, Sb and Pb in Fe-C based passivators amended soil reduced 3.95%-13.60%/17.63%-25.89%, 13.67%-25.67%/3.81-10.87% and 5.44%-13.05%/1.18%-6.90% after FT/DW aging, respectively. Meanwhile, the proportion of unstable fractions of As, Sb and Pb also increased. The release of As, Sb and Pb was highly related to soil organic matter (SOM), dissolved organic carbon (DOC), Fe(Ⅲ, hydr) oxides, pH and soil particle size. Particularly, the decomposition of Fe-SOM associations and Fe(Ⅲ) reduction contributed to the release of heavy metals during FT and DW aging. In addition, the field trial further confirmed that Fe-C based passivator has long-term stability capacity for As, Sb and Pb under natural conditions. Our findings confirmed the long-term immobilization of As, Sb and Pb by Fe-C based passivators, and provided insights for inhibiting heavy metals release in extreme environments.

79. 题目: Biochar-reinforced polyamide 12 composites for sustainable selective laser sintering 3D printing: Performance enhancement and carbon footprint reduction
文章编号: N25071002
期刊: Chemical Engineering Journal
作者: Hossein Baniasadi, Tuomas Puttonen, Roozbeh Abidnejad, Siddharth Jayaprakash, Jouni Partanen, Erlantz Lizundia, Jukka Niskanen
更新时间: 2025-07-10
摘要: The development of sustainable, high-performance materials for additive manufacturing is crucial for advancing low-carbon technologies. This study investigates biochar, a renewable carbon-rich material derived from biomass pyrolysis, as a functional filler in polyamide 12 (PA12) composites for selective laser sintering (SLS) 3D printing. A comprehensive structure–property–function analysis revealed that incorporating up to 10 wt% biochar significantly enhanced the tensile modulus from 1.4 ± 0.1 GPa to 3.2 ± 0.3 GPa and tensile strength from 43.1 ± 1.2 MPa to 64.7 ± 2.0 MPa, without compromising printability. At higher loadings (>20 wt%), biochar agglomeration and interfacial defects were observed via scanning electron microscopy, leading to reduced mechanical performance. Thermogravimetric analysis showed improved thermal stability, with a shift in peak degradation temperature from 445.5 °C for neat PA12 to 454.0 °C for the composite containing 30 wt% biochar. Rheological characterization demonstrated increased viscosity and elasticity, facilitating better melt strength and SLS processability. Most notably, life cycle assessment (LCA) revealed up to a 66 % reduction in climate change potential for the PA12-BC20 composite compared to pure PA12 when accounting for biochar's biogenic carbon sequestration. These findings establish biochar as a structurally and environmentally advantageous carbon additive, offering a dual benefit of performance enhancement and carbon footprint reduction for advanced sustainable 3D printing applications.

80. 题目: Mobilization of water-dispersible colloidal chromium and nickel in basalt-derived paddy soils: Role of Fe (hydr)oxides and organic matter
文章编号: N25071001
期刊: Journal of Hazardous Materials
作者: Ting Liu, Jingjing Li, Lirong Liu, Yanjun Jiang, Shengsheng Sun, Tenghaobo Deng, Shizhong Wang, Yetao Tang, Zhuobiao Ni, Qingqi Lin, Rongliang Qiu
更新时间: 2025-07-10
摘要: Basalt weathering can lead to heavy metal enrichment in soils, and nickel (Ni) isotopes can served as an effective tracer for this weathering process. Water-dispersible colloids (WDCs) are ubiquitous in soil environments and can facilitate the long-range transport of sorbed pollutants. Here, we analyzed soil colloidal distribution, concentration, morphology and Ni isotopes in soil to understand the potential mobilization of WDC-bound Cr and Ni in basalt-derived paddy soils. Ultrafiltration results showed that on average > 90% of Cr (4714.0 μg L^-1) and Ni (4532.3 μg L^-1) in soil solution occurring in colloid-bound form (< 1000 nm). Using AF4-UV-ICP-MS and STEM-EDS, we found that iron (Fe)-organic matter composite minerals colloids are primary carriers of Cr and Ni. Specifically, colloid-bound Cr/Ni were mainly associated with nanoparticles (1~20 nm) and fine colloid (125–350 nm) soil particle size. Notably, high weathering intensity and pH promoted the release of WDCs- Cr and Ni. Soil Ni isotopes shown light δ⁶⁰Ni composition (-0.17‰ ~ -0.11‰), primarily determined by Ni incorporation into Fe-(hydr)oxides. Ni isotopes revealed that Ni in soil and rice originates from parent rocks. These results highlighted the pivotal role of the WDCs mobilizing heavy metals in naturally high background paddy soils.