24年11月16日文献情报（18篇）

24年11月16日文献情报

1. 题目: Evaluating the role of recalcitrant dissolved organic matter in bacterial community dynamics in urbanized freshwater ecosystems

文章编号: N24111618
期刊: Science of the Total Environment
作者: Yang Liu, Xiding Wang, Huimin Li, Ruikai Zhang, Xudong Liu, Fangru Nan, Qi Liu, Junping Lv, Jia Feng, Chao Ma, Shulian Xie
更新时间: 2024-11-16
摘要: Dissolved organic matter (DOM) and recalcitrant dissolved organic matter (RDOM) play distinct roles in shaping microbial communities. However, characterizing these roles is difficult, especially in ecosystems subjected to varying degrees of anthropogenic influence. This study investigated the molecular compositions and ecological impacts of DOM and RDOM in the Fen River, Shanxi Taiyuan, comparing pristine upstream regions with highly urbanized downstream areas. Using 16S rRNA gene sequencing and LC-MS-based metabolomics, we observed significant shifts in microbial community composition, diversity, and metabolic functions. Upstream communities, characterized by higher diversity, were dominated by Bacteroidota, Proteobacteria, and Cyanobacteria, while downstream communities, influenced by pollution, exhibited increased expression of genes related to amino acid metabolism. Fluorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) revealed that upstream DOM contained higher proportions of complex, high molecular weight compounds, including significant proportions of carboxyl-rich alicyclic molecules (CRAM) and island of stability (IOS) compounds, which play key roles in long-term carbon storage and microbial carbon sequestration. In contrast, downstream DOM was characterized as having lower aromaticity and more saturated compounds, with reduced proportions of CRAM and IOS, reflecting the impact of anthropogenic activities. These findings underscored the critical roles of CRAM and IOS in regulating DOM stability and microbial communities, further highlighting the need for targeted pollution control strategies to preserve ecosystem function in urbanized water bodies.
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2. 题目: Enhanced Sludge Dewaterability and Confined Antibiotics Degradation in Biochar-Mediated Chemical Conditioning through Modulating Fe Oxidative States Distribution and Reaction sites in Multiphase

文章编号: N24111617
期刊: Water Research
作者: Siqi Wang, Fang Luo, Lingzhi He, Zhuo Liu, Jia Wang, Zhuwei Liao, Huijie Hou, Junwen Li, Xiaohan Ning, Zhuqi Chen
更新时间: 2024-11-16
摘要: For antibiotic-enriched waste activated sludge, classical iron-based chemical conditioning significantly enhanced sludge dewaterability. Nevertheless, the intricate constituents within sludge rapidly depleted reactive oxygen species (ROS), leading to challenges such as excessive production of iron sludge and inadequate elimination of antibiotics from sludge. Herein, we proposed an innovative strategy integrating biochar with Fe(II) for peroxymonosulfate (PMS) activation, aiming to enhance both sludge dewaterability and antibiotics elimination simultaneously. Compared to classical chemical conditioning of Fe(II)/PMS, the presence of biochar not only reduced bound water content of sludge from 1.36 g/g DS to 0.97 g/g DS, but also enhanced sulfamethoxazole (SMX) degradation rate constant from 0.015 min^-1 to 0.042 min^-1. Mechanism studies disclosed the essential roles of biochar in modulating Fe oxidative states distribution and reaction sites in multiphase. Initially, biochar elevated Fe(II)/Fe(III) ratio from 0.38 to 0.78 by abundant carbon defects, which significantly promoted the cumulative concentration of predominant ROS, hydroxyl radicals (•OH), from 4.6 mM to 8.1 mM. Subsequently, EPS underwent destruction by •OH, leading to the liberation of antibiotics and negatively charged polysaccharides (PS), proteins (PN). Secondly, biochar enriched hydrophobic PN with an elevated ratio of PN/PS from 0.92 to 1.50, while the charge neutralization occurred between Fe(II)/Fe(III) and PN, PS, leading to sludge particles granulation. Finally, the mesoporous structure of biochar not only achieved SMX enrichment, but also enhanced the mass transfer of Fe(II)/Fe(III) from sludge aqueous phase to its surface, ensuring that the in-situ generated •OH efficiently targets the locally concentrated SMX. Overall, this work provides a new guidance for developing biochar-mediated chemical conditioning, aiming to enhance the generation and utilization of •OH for antibiotics elimination from sludge.
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3. 题目: Molecular characterization of major oxidative potential active species in ambient PM2.5: Emissions from biomass burning and ship exhaust

文章编号: N24111616
期刊: Environmental Pollution
作者: Chunbo Xing, Yaling Zeng, Xin Yang, Antai Zhang, Jinghao Zhai, Baohua Cai, Shao Shi, Yin Zhang, Yujie Zhang, Tzung-May Fu, Lei Zhu, Huizhong Shen, Jianhuai Ye, Chen Wang
更新时间: 2024-11-16
摘要: Ambient fine particulate matter (PM_2.5) can catalyze the generation of reactive oxygen species in vivo, causing hazardous effects on human health. Molecular-level analysis of major oxidative potential (OP) active species is still limited. In this study, we used non-targeted high-resolution mass spectrometry to analyze the water-soluble organic components of ambient PM_2.5 samples in winter and summer. Chemical components and back trajectory analysis revealed significant impacts of biomass burning and ship emissions on PM_2.5 in winter and summer, respectively. Significance Analysis of the Microarray method and correlation analyses were combined to identify OP (OP^DTT and OP^OH) active species in characteristic organic compounds emitted from ship and biomass combustion emissions and to explore possible mechanisms. The results showed that the characteristic compounds emitted from ship were mainly organic amine compounds and contained more sulfur-containing components, while the characteristic compounds emitted from biomass burning were mainly oxygen-containing aromatic compounds of CHO and CHON groups. The high toxicity of summer PM_2.5 might derive from reduced organic nitrogen compounds (C₆H₁₄N₂O₃S, C₆H₁₂N₂O₃S, C₁₀H₉N₃O, C₆H₉N₅O₃S, and C₆H₁₄N₄O) emission from ship sources. These reduced organic nitrogen compounds can form complexes with metals, affecting their solubility and reactivity in aerosols. Phenolic hydroxyl compounds were the main contributors to the PM_2.5 OP from biomass burning in winter. Semiquinone radicals produced by oxidation of phenolic compounds can further promote the generation of reactive oxygen species through Fenton-like reactions. Our studies based on ambient PM_2.5 samples further deepened the understanding of the molecular level of organic compounds emitted from ships and biomass burning, and their association with OP.
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4. 题目: Performance and mechanism of the biochar-supported Ni0/Co0/MnO composite catalyst for peroxymonosulfate activation to degrade iopamidol

文章编号: N24111615
期刊: Journal of Environmental Chemical Engineering
作者: Meijuan Gao, Hong Wei, Qian Cai, Ruijie Teng, Junqi Song, Feng Pan, Huaien Li
更新时间: 2024-11-16
摘要: A biochar-supported Ni⁰/Co⁰/MnO composite catalyst was prepared from the cathode material (CM) of spent ternary 523 lithium-ion batteries (LIBs) and buckwheat hulls. The effect of pyrolysis temperature (x) and different loading ratios (y) of xBC_yCM on the activation of peroxymonosulfate (PMS) was investigated. The results showed that the loading of Ni⁰/Co⁰/MnO on the biochar (BC) enhanced the IPM degradation and effectively reduced metal ions’ leaching. The 850BC₁₀CM/PMS system degraded iopamidol (IPM) within the wide pH range of 5.0 - 10.0. The pseudo-first reaction rate constant k_obs was 0.0944 min^-1 during 25 min under optimal conditions (catalyst dose of 0.1 g·L⁻¹, 0.5 mM of PMS, and an initial pH value of 10.0), while the leaching concentrations of Ni, Co, and Mn were 0.089, 0.035, and 0.067 mg·L^-1, respectively. Furthermore, the 850BC₁₀CM degraded IPM by radicals (·OH, SO₄^•−, and ·O₂^-) and non-radical pathways (¹O₂ and an electron transfer). As the pH value increased from 7.0 to 10.0, the fluorescence analysis and quenching experiments revealed a decrease in the effects of SO₄^•− and ·OH, while the effect of ¹O₂ was enhanced. The 850BC₁₀CM could still achieve a removal rate of 86.6% for IPM after four cycles. Based on the liquid chromatography-mass spectrometry (LC-MS) results of degradation intermediates, five possible degradation pathways were proposed. The 850BC₁₀CM inhibited the formation of the iodoform CHI₃. In short, the 850BC₁₀CM, which was prepared by using a green, sustainable development of waste utilization, exhibited a safe and effective performance for the removal of emerging IPM pollutants.
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5. 题目: Identifying Life Cycle Environmental Hotspots in Phosphorus Recovery from Wastewater Using Modified Biochars

文章编号: N24111614
期刊: ACS Sustainable Chemistry & Engineering
作者: Xinyu Zheng, Guoxin Yan, Xiaoyuan Wang, Ka Leung Lam
更新时间: 2024-11-16
摘要: Biochar offers a potential sustainable pathway for recovering phosphorus from wastewater to agriculture. Magnesium-modified biochar has demonstrated an enhanced phosphate adsorption capacity and excellent bioavailability. This study aims to identify the life cycle environmental hotspots in phosphorus recovery from wastewater using magnesium-modified biochars derived from bamboo, corn, and wood and compared them with common phosphate fertilizers. The results show that the biomass supply stage and the modification stage are the main environmental hotspots in most impact categories. As the phosphorus load of wastewater decreases, the phosphorus recovery stage could become the hotspot. Although phosphate-loaded magnesium-modified biochars in the base case do not have a better overall environmental performance than most phosphate fertilizers (especially those without nitrogen), they have significantly lower mineral resource scarcity and ecotoxicity. The sensitivity analysis suggests that the results are sensitive to the background inventory selected. The analysis indicates that the biochar yield, the phosphate adsorption capacity of the biochars, the source of modification chemical, and the source of biomass feedstock are key areas for technological and inventory improvement. In the future, a comprehensive field application inventory and a diverse set of background inventory are needed to better assess this sorption-based phosphorus recovery pathway.
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6. 题目: Mercury Reduction by Agricultural Organic Waste-Derived Dissolved Organic Matter: Kinetic Analysis and the Role of Light-Induced Free Radicals

文章编号: N24111613
期刊: Environmental Research
作者: Cong Yao, Jinping Xue, Qing Xie, Sha Chen, Tao Jiang, Juan Wang, Yongmin Wang, Dingyong Wang
更新时间: 2024-11-16
摘要: Agricultural organic wastes can leach dissolved organic matter (DOM) into surrounding water bodies, establishing them as significant sources of aquatic DOM. Given the importance of DOM in the biogeochemical cycling of mercury (Hg), this DOM may further mediate divalent Hg (Hg(II)) reduction, a process that remains poorly understood. This study investigated the Hg(II) reduction using DOM derived from six representative agricultural wastes, categorized into livestock manure (chicken, pig, cow) and crop straw (rice, corn, rapeseed), with systematic considerations of the kinetics of reduction processes and the involvement of key free radicals. Results revealed that photoreduction was the primary pathway for Hg(II) reduction, with pig manure DOM exhibiting the highest efficiency at 36%. Key DOM quality parameters, such as protein-like components, have been identified as critical determinants of Hg(II) photoreduction capacity. Furthermore, free radicals induced by DOM could either enhance or inhibit Hg(II) reduction capacities. Specifically, in livestock manure, the superoxide anion (O₂^•-)·was identified as the primary radical promoting Hg(II) photoreduction of pig manure DOM. In crop straw, hydroxyl radicals (·OH) were found to inhibit Hg(II) photoreduction, whereas O₂^•- promoted the Hg(II) photoreduction of rice straw DOM. These findings provide valuable insights into the role of agricultural organic wastes in the biogeochemical cycling of Hg within aquatic ecosystems.
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7. 题目: Global Distributions of Reactive Iron and Aluminum Influence the Spatial Variation of Soil Organic Carbon

文章编号: N24111612
期刊: Global Change Biology
作者: Siyu Ren, Chuankuan Wang, Zhenghu Zhou
更新时间: 2024-11-16
摘要: Organic carbon persistence in soils is predominantly controlled by physical accessibility rather than by its biochemical recalcitrance. Understanding the regulation of soil iron (Fe) and aluminum (Al) (hydr)oxides, playing a dominant role in mineral protection, on soil organic carbon (SOC) would increase the reliable projections of the feedback of terrestrial ecosystems to global warming. Here, we conducted a continental-scale survey in China (341 sites) and a global synthesis (6786 observations) to reveal the global distributions of Fe/Al (hydr)oxides and their effects on SOC storage in terrestrial ecosystems. We generated the first global maps of soil Fe/Al (hydr)oxides with high accuracy (with R² more than 0.74). The variance decomposition analysis showed that Fe/Al (hydr)oxides explained the most proportion of variance for topsoil (0–30 cm) and subsoil (30–100 cm) SOC. Therefore, soil Fe/Al (hydr)oxides play a stronger role in explaining the spatial variation of SOC than well-studied climate, edaphic, vegetated, and soil depth factors in both topsoil and subsoil. Collectively, the planetary-scale significance of soil Fe/Al (hydr)oxides for SOC highlights that soil Fe/Al (hydr)oxides should be incorporated into Earth System Models to reduce the uncertainty in predicting SOC dynamics.
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8. 题目: Afforestation With Xerophytic Shrubs Promoted Soil Organic Carbon Stability in a Hyper-Arid Environment of Desert

文章编号: N24111611
期刊: Land Degradation & Development
作者: Guangxing Zhao, Akash Tariq, Zhihao Zhang, Muhammad Nazim, Corina Graciano, Jordi Sardans, Xinping Dong, Yanju Gao, Josep Peñuelas, Fanjiang Zeng
更新时间: 2024-11-16
摘要: In desert ecosystems, afforestation with xerophytic shrubs has the potential to significantly increase soil nutrient levels by mitigating wind and soil erosion. Nevertheless, further investigation is required to elucidate the changes in soil organic carbon (SOC) fractions and stability on different soil depths with afforestation years. We collected soil samples from the 0–20, 20–60, and 60–100 cm depths of three xerophytic shrublands ages (3, 7, and 10 years), with a natural desert as the control, in a hyper-arid desert region. We investigated the variations of SOC fractions (stable and active C) and stability (stability index and MAOC:POC ratios) after afforestation. The results showed that the rate of increase in SOC fractions and stability did not follow a linear trajectory with afforestation years. Instead, they accelerated around 7 years but then decreased after 10 years. The increase in SOC stability was primarily attributed to the greater increase in stable C within the total SOC pool. Afforestation increased the concentration of ROC from 0.26 to 0.89 g kg⁻¹ and MAOC from 0.11 to 0.78 g kg⁻¹. Afforestation increased SOC stability by 74.36%–231% compared to the CK in the 0–100 cm. SOC stability in the 60–100 cm was higher than that in the 0–20 cm layer, while SOC stability varied insignificantly across soil layers. The strongest direct positive impact on SOC stability was attributed to changes in soil physicochemical properties rather than soil microbial biomass or aggregate stability. These findings contribute to our understanding of the importance of afforestation in increasing SOC stability in desert ecosystems.
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9. 题目: Variation in microbial communities and network ecological clusters driven by soil organic carbon in an inshore saline soil amended with hydrochar in Yellow River Delta, China

文章编号: N24111610
期刊: Environmental Research
作者: Hui Yao, Yadong Cheng, Qingxian Kong, Xiao Wang, Ziguo Rong, Yue Quan, Xiangwei You, Hao Zheng, Yiqiang Li
更新时间: 2024-11-16
摘要: Char materials (e.g., hydrochar) can enhance carbon sequestration, improve soil quality and modulate soil microbial communities to recuperate soil health. However, little is known about the soil organic carbon (SOC) content, as well as the microbial communities and co-occurrence networks in response to hydrochar amendment in an inshore saline soil. Here, the effect of Sesbania cannabina (a halophyte) straw derived hydrochar (SHC) amendment on SOC and labile organic carbon (LOC) fractions and the potential associations among SOC content change, soil C-cycling enzyme activities and microbial communities were illustrated using a pot experiment. SHC effectively improved the contents of SOC and LOC, particularly particulate organic carbon (POC), and stimulated the activities of C-cycling enzymes. Furthermore, SHC induced shift in microbial community compositions and co-occurrence networks, result in decrease in relative abundance of Actinobacteriota and its corresponding ecological cluster, which may favor SOC accumulation. Functional annotation of prokaryotic taxa (FAPROTAX) analysis also revealed a decrease in microbial ecological function related to carbon degradation. These findings provided a deeper insight about the hydrochar-induced SOC enhancement and suggested an efficient approach to improve C sequestration and improve soil health in the coastal salt-affected soil.
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10. 题目: Performance and mechanism of biochar pretreatment on improving short-chain fatty acids production from anaerobic fermentation of waste activated sludge

文章编号: N24111609
期刊: Journal of Environmental Chemical Engineering
作者: Xiaobo Gao, Zhiwen Wang, Jiazeng Ding, Jiaxing Huang, Yufen Wang, Tingting Zhu, Yiwen Liu
更新时间: 2024-11-16
摘要: As a technology to recover resources from sludge, anaerobic fermentation to produce short-chain fatty acids (SCFAs) faces the following problems: difficult dissolution of organic matter and slow electron transfer. This study proposes a novel technique for energy recovery from waste activated sludge (WAS), i.e., employing biochar pretreatment in anaerobic fermentation to enhance SCFAs production. The results showed that the maximum SCFAs production reached 348.61 mg COD/g VSS, with acetic acid making up 44.4% at an optimal condition (i.e., 2.0 g biochar/g VSS). The value of SCFAs production represents an increase of 9.6-fold compared to the control group. Mechanism exploration reveals that biochar pretreatment disrupted the extracellular polymers (EPS) and cell wall structures through its strong alkalinity, thereby promoting the release of abundant biodegradable organic matter for SCFAs production. Meanwhile, biochar enhances electron transfer during anaerobic fermentation, which further promotes SCFAs production. Conversely, it suppressed the bioactivity of Coenzyme F₄₂₀. Microbial community analysis confirms that biochar pretreatment significantly enriched several hydrolytic bacteria and acid-producing bacteria, such as Tissierella sp. and Proteiniborus sp. Importantly, the relative abundance of Proteiniclasticum sp. with electron transport ability increased from 0.04% to 6.72%. FTIR spectroscopy shows that biochar carried surface functional groups involved in electron transport (i.e., aromatic groups C-H and C-OH) and surface functional groups with strong redox activity (i.e., C=O, C=C). This work confirmed the feasibility of biochar pretreatment to enhance SCFAs production and revealed possible mechanisms, providing a new strategy for effective sludge treatment.
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11. 题目: Experiments, kinetics and DFT analysis on a novel system of biochar-oil-water slurry based hydrogen-rich syngas production via two-stage pyrolysis-reforming

文章编号: N24111608
期刊: Journal of Environmental Chemical Engineering
作者: Donglin He, Tingting Zhang, Shuang Chen, Zhilu Ren, Hong Yin, Yafei Chen, Yangpin Ou, Haifeng Gong
更新时间: 2024-11-16
摘要: Waste engine oil as industrial hazardous waste poses a great threat to the environment. By preparing a slurry with biochar and heating it in two stages with pyrolysis-reforming, it can be converted into hydrogen-rich syngas. First, the effects of the mixing ratio of the slurry on the characteristic temperature and activation energy of the co-pyrolysis process were studied through thermogravimetric analysis and kinetic analysis. The results showed that an increase in the content of waste engine oil in the slurry increased the characteristic temperature of the main reaction stage of the slurry, and accelerated the co-pyrolysis rate. The activation energy of the slurry was found to increase and then decrease by kinetic analysis. Secondly, by conducting reforming experiments and catalyst characterization, the study investigated the impact of S/C ratio, slurry co-reforming with oil and biochar separate reforming on the production of hydrogen-rich syngas. The results showed that under the conditions of S/C=3.5 and 800 ℃, the co-reforming of slurry produced 2-3 times more hydrogen-rich syngas and H₂ than the separate reforming of oil and biochar, with H₂ yield reaching 1096 ml/g and concentration of 58.23%. Furthermore, by employing C₁₈H₃₈ as a model compound for studying co-pyrolysis pathways at a molecular level, it was observed that large molecules are more prone to chain breaking from their ends during co-pyrolysis, resulting in small molecule formation primarily represented by C₂H₄, C₂H₅·, ·C₃H₆·, CH₃· and ·C₄H₈· species. This paper provides a theoretical foundation for waste engine oil resource utilization and hydrogen energy transformation.
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12. 题目: Oxidative Hydrothermal Carbonization to Fabricate Versatile Magnetic Biochar for Fenton-Like Degradation of Phenolic Compounds

文章编号: N24111607
期刊: Journal of Environmental Chemical Engineering
作者: Ahui Sun, Yi Liang, Kaili He, Qinhe Pan, Shengxu Luo, Xiang Liu, Hongru Jiang, Jihui Li
更新时间: 2024-11-16
摘要: Magnetic biochar (MBC) has drawn great attention as a versatile catalyst for advanced oxidation elimination of pollutants from aqueous solution with synergy of iron species and carbon matrix. Herein, an MBC was manufactured by oxidative hydrothermal carbonization employing potassium ferrate as precursor and internal oxidant for Fenton-like degradation of phenols in aqueous solution. This unique oxidative hydrothermal carbonization allowed multiple iron species to be introduced with persistent free radicals (PFRs), providing diverse catalysis sites for activating H₂O₂ into reactive oxygen species (ROSs) for efficient degradation of phenols. Moreover, graphite structure was generated with abundant oxygen functional groups, benefiting to accelerating Fe³⁺/Fe²⁺ cycle by electron shuttle and transfer. The catalysis degradation efficiency was up to 99.74% with 44.4% of total organic carbon (TOC) removal rate for 75 mg L⁻¹ of phenol using 0.2 g L⁻¹ MBC dosage. Satisfactory recyclability was achieved for the MBC as the catalysis degradation efficiency slightly decreased from 99.74% to 87.95% after five times recycling. Moreover, the MBC catalysis system exhibited extensive applicability in real water matrices and for degradation of different phenols with high efficiency. Serving as a demonstration of oxidized magnetic biochar for efficient Fenton-like degradation of phenols, this work highlighted the great potential of oxidative hydrothermal carbonization in preparation of high performance magnetic biochar.
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13. 题目: Insight into the effect of humic acids on transport of Cd2+ in biochar-amended saturated porous media

文章编号: N24111606
期刊: Journal of Soils and Sediments
作者: Tian Zhao, Yongyang Liu, Rui Liu, Fang Wang
更新时间: 2024-11-16
摘要:

Purpose

Cadmium (Cd), as a common heavy metal pollutant, has attracted considerable attention due to its ecotoxicity in aquatic and terrestrial ecosystems. However, the impact of humic acid (HA) on the transport of Cd²⁺ in biochar-amended soils remains unclear.

Methods

The transport behavior of Cd²⁺ in saturated porous media amended with pomelo peel biochar (PBC) and the effect of HA were examined by column transport experiment, and the breakthrough curves were simulated by the two-site nonequilibrium transport model. The underlying mechanisms were analyzed by batch adsorption experiment and X-ray photoelectron spectroscopy (XPS) characterization.

Results

The addition of PBC significantly inhibited Cd²⁺ transport. After the addition of 0.5% and 1% (w/w) PBC to the sand, the peak breakthough time of Cd²⁺ was delayed by 50% and 125%, respectively. This is mainly due to the microporous structure and high surface area of PBC, which could provide numerous adsorption sites for Cd²⁺. The most notable observation is that in the absence of PBC, HA had a negligible effect on the transport of Cd²⁺. However, in the presence of PBC, 20 mg/L HA inhibited Cd²⁺ transport in PBC-amended saturated porous media, and the peak breakthrough time was delayed by 27.8%. As the concentration of HA increased to 50 mg/L and 100 mg/L, the inhibitory effect weakened.

Conclusions

Low concentrations of HA inhibited Cd²⁺ transport in PBC-amended saturated porous media. As the concentration of HA increased, the inhibitory effect significantly weakened. This study suggests using biochar can be a promising approach for improving the efficacy of soil remediation in heavy metal-contaminated environments. In cases where HA content is high in groundwater and soil, it is necessary to moderately increase the use of biochar to enhance the immobilization of Cd²⁺.

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14. 题目: Thioarsenate sorbs to natural organic matter through ferric iron-bridged ternary complexation to a lower extent than arsenite

文章编号: N24111605
期刊: Journal of Hazardous Materials
作者: Mohd Amir Husain, Johannes Besold, Jon Petter Gustafsson, Andreas C Scheinost, Britta Planer-Friedrich, Ashis Biswas
更新时间: 2024-11-16
摘要: Understanding processes regulating thioarsenate (H_xAsS_nO_4−n^3−x; n = 1 – 3; x = 1 – 3) mobility is essential to predicting the fate of arsenic (As) in aquatic environments under anoxic conditions. Under such conditions, natural organic matter (NOM) is known to effectively sorb arsenite and arsenate due to metal cation-bridged ternary complexation with the NOM. However, the extent and mechanism of thioarsenate sorption onto NOM via similar complexation has not been investigated. By equilibrating monothioarsenate (representative of thioarsenate) with a peat (model NOM) with different Fe(III) loadings, this study shows that NOM can sorb monothioarsenate considerably via Fe(III)-bridging. Iron and As K-edge XAS analysis of the monothioarsenate-treated Fe-loaded peats revealed that monothioarsenate forms bidentate mononuclear edge-shared (¹E) (R_As···Fe: 2.89 ± 0.02 Å) and bidentate binuclear corner-shared (²C) (R_As···Fe: 3.32 Å) complexes with organically bound Fe(O,OH)₆ octahedra, in addition to direct covalent bonds with oxygen-containing functional groups (e.g., –COOH and –OH) (R_As···C: 2.74 ± 0.02 Å), upon equilibration with the Fe(III)-loaded peat. However, the extent of monothioarsenate sorption was considerably less than that of its precursor As species, arsenite, due to higher electrostatic repulsion between the negatively charged monothioarsenate and peat. This study implies that thioarsenate formation under anoxic conditions would increase As mobility by decreasing its sorption onto the NOM.
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15. 题目: Spatial distribution studies on sedimentary organic matter along the shoreline of Arabian Sea: insights from Kollam, Southwest Coast, India

文章编号: N24111604
期刊: Environmental Monitoring and Assessment
作者: Manikandan Subramanian, Jaya Divakaran Sarasamma, Krishnan Anoop Krishnan
更新时间: 2024-11-16
摘要:

The present study was aimed at investigating the source, quality, and quantity of organic matter and labile fraction of biochemical constituents in the surficial sediments of Arabian Sea Shoreline at Kollam, India, which gives an input into the processes associated with the subsurface geochemistry pattern. About 15 surface sediment samples were collected from the five beaches for this study during January 2021. The samples were analyzed for CHN, total organic carbon (TOC), and labile fraction such as carbohydrates (CHO), proteins (PRO), and lipids (LIP). The TOC/TN ratio revealed that the source organic matter (OM) in the samples was primarily of marine origin and autochthonous, except TM3 at Thirumullavaram. Thirumullavaram is a sheltered beach, and it has low hydrodynamic process. The high organic matter content in TM3 (13.9) may be the originated from the terrestrial input. The hierarchical cluster analysis revealed that TM3 indicate that unique character to other stations. Principal component analysis revealed that three components accounted for 78% of the total variance. PC1 variance was associated with carbon-based organic compounds. PC2 was predominantly influenced by CHO and LOM, suggesting that PC2 may encompass variability associated with these nutritional profiles. PC3 was influenced by LIP and LIP/CHO, showing it may be a lipid-related component. The PRO to CHO ratio is < 1, exhibiting old aged organic matter deposited in sediments and the meso-oligotrophic status. The LIP to CHO ratio, recorded as < 1, exhibits the poor quality of energetic (food) OM in sediments. The sediment samples exhibit the following trend CHO > PRO > LIP.

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16. 题目: Freeze–Thaw Cycle Events Enable the Deep Disintegration of Biochar: Release of Dissolved Black Carbon and Its Structural-Dependent Carbon Sequestration Capacity

文章编号: N24111603
期刊: Environmental Science & Technology
作者: Lang Zhu, Na Chen, Xianglei Zhang, Luyao Ren, Rui Zou, Jia Xie, Zhiqiang Wang, Huiqiang Yang, Zelin Hao, Jianjun Qin, Hanzhong Jia
更新时间: 2024-11-16
摘要: Biochar is widely regarded as a recalcitrant carbon pool. However, the impact of freeze–thaw cycle events on its storage capacity, particularly on the release of dissolved black carbon (DBC), has remained poorly investigated. This study investigated the release behavior of DBC from biochar pyrolyzed at 300–700 °C during freeze–thaw cycles and their retention capacity in soil. Freeze–thaw cycles dramatically promoted DBC release (33.08–230.74 mg C L^–1), exhibiting an order of magnitude higher than those without freeze–thaw process. The release kinetics of freeze–thaw-induced DBC varied depending on the pyrolysis temperature of biochar due to the different disintegration mechanisms. Interestingly, the retention capacity of freeze–thaw-induced DBC in soil showed a reduction ranging from 7.7 to 29.5% compared to DBC without the freeze–thaw process. This reduction can be attributed to numerous hydrophilic low-molecular-weight compounds (16.97–75.31%) in freeze–thaw-induced DBC, as evidenced by the results of size exclusion chromatography, fluorescence excitation/emission matrix, Fourier transform infrared spectroscopy, and nuclear magnetic resonance. These compounds tend to concentrate in the aqueous phase rather than being retained in the soil, potentially exacerbating the outflow of dissolved organic carbon. These findings clarify the release behavior of DBC during freeze–thaw cycles and reveal their contribution to the attenuation of carbon pools in cold regions.
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17. 题目: Comprehensive effects of tea branch biochar on antibiotic resistance profiles and C/N/S cycling in the compost microbiota of animal manure

文章编号: N24111602
期刊: Science of the Total Environment
作者: Jiawei Ma, Wenyan Yang, Shuai Li, Zhenyu Yang, Chen Qiao, Dan Liu, Mei Wang
更新时间: 2024-11-16
摘要: The comprehensive effects of exogenous additives on microbial-driven antibiotic resistance profiles and C/N/S conversion in animal manure composting remains uncertain. This study examined whether tea branch biochar could regulate the microflora involved in antibiotic resistance and C/N/S conversion during pig and chicken manure composting. Compared with the control treatment, biochar addition prolonged the high-temperature period (>55 °C) for 1–2 days and raised the maximum temperature in chicken manure composting. Moreover, biochar addition reduced the prevalence of antibiotic resistance genes (ARGs) in both pig and chicken manure composting by up to 30 %, targeting various types of ARGs such as peptide, phenicol, and diaminopyrimidines. Additionally, the compost microbiota exhibited the overlaps of C/N/S conversion functions. Luteimonas (Xanthomonadaceae) was identified as a dominant bacterium responsible for C/N/S conversion in both pig and chicken manure composting, while also acting as a potential ARG carrier. Thus, Luteimonas is crucial in shaping antibiotic resistance profiles and C/N/S cycling in animal manure composting, indicating its role as a keystone genus. These findings suggest that tea branch biochar can mitigate the spread of ARGs from animal manure, as well as enhance nutrient cycling and compost quality.
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18. 题目: Critical role of soil-applied molybdenum dioxide composite biochar material in enhancing Cr(VI) remediation process: The driver of Fe(III)/Fe(II) redox cycle

文章编号: N24111601
期刊: Journal of Environmental Management
作者: Mingxuan Liu, Heng Li, Qiang Fu, Tianxiao Li, Renjie Hou, Ping Xue, Xuechen Yang, Mo Li, Dong Liu
更新时间: 2024-11-16
摘要: Heavy metal contamination of agricultural land due to sewage irrigation, over-application of fertilizers and pesticides, and industrial activities. Biochar, due to its rich functional groups and excellent electrochemical performance, is used for the remediation of heavy metal-contaminated farmland. However, the remediation mechanism remains uncertain due to the influence of minerals and multi-element composite pollution on soil. Therefore, introducing transition metal oxide MoO2 to prepare biochar composite remediation materials enhances the adsorption and reduction of soil Cr (Ⅵ). This study compared the differences in Cr (Ⅵ) improvement under different pollution systems and pH conditions and explored the potential mechanism of Fe (Ⅲ)/Fe (Ⅱ) redox cycling in Cr (Ⅵ) remediation. The results showed that both biochar MoO2 ball-milling composite (BC + M) and biochar-loaded MoO2 (BC/M) retained the original biochar (BC) remediation method for Cr (Ⅵ). Among them, the remediation of BC/M was the most stable, with the maximum remediation value ranging from approximately 6.52 to 58.58 mg/kg. In different pollution systems, Cd and Pb exhibited competitive adsorption toward Cr (Ⅵ), but they enhanced Cr (Ⅵ) remediation by promoting adsorption and self-complexation. In acidic conditions (pH = 4), BC/M showed the best remediation effect, with a reduction kinetic constant of 34.61 × 10⁻³ S⁻¹ and a maximum adsorption capacity of 61.64 mg/g. Fe (Ⅲ)/Fe (Ⅱ) redox cycling accelerated the reduction of Cr (Ⅵ) (R² = 0.81), and MoO2 promoted the Fe (Ⅲ)/Fe (Ⅱ) redox cycle. BC/M enhanced the Fe (Ⅱ) formation efficiency by 66.39% and 71.81% compared to BC + M and BC at pH = 4. The introduction of MoO2 and biochar composite materials enhanced the reduction process of Cr (Ⅵ), with BC/M achieving the optimal remediation level. This study reveals the potential mechanisms of MoO2 and biochar composite materials in soil Cr (Ⅵ) remediation, providing a reference and insight for the preparation of Cr (Ⅵ) remediation materials and the treatment of contaminated farmland.
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