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SSRN 2024年

作者： Zhang, Lian Fang, Wei Zhang, Panyue Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China

The high water content of sludge limits its subsequent treatment and disposal. This study for the first time proposed a novel Fe2+/Ca(ClO)2/TA process to enhance waste activated sludge (WAS) dewaterability. When the WAS was treated with 1.2 mmol/g total solids (TS) Ca(ClO)2, 1.0 mmol/g TS Fe2+ and 0.15 mmol/g TS TA, the capillary suction time (CST), specific resistance to filtration (SRF) and water content (Wc) of sludge cake were reduced by 66.58%, 88.31% and 9.75% respectively. The mechanism investigations indicated that the·OH and CH2CH2OH generated in the Fe2+/Ca(ClO)2/TA system decomposed extracellular polymeric substance (EPS) components and sludge cells, and transformed the extracellular protein secondary structure, releasing bound water into free water. Besides, the formed multivalent ions (such as Fe3+ and Ca2+) and TA led to re-coagulation, increased sludge particle size, and heightened sludge flocculability. In addition, the TA can also efficiently complex hydrophilic protein content and facilitate the combination of calcium ions with sulfate ions to form more gypsum material. As a result, the permeability and compressibility of WAS flocs were strengthened, which also contributed to the improvement of sludge dewatering performance. This study provides a new approach for efficient improvement in sludge dewaterability. © 2024, The Authors. All rights reserved.

关键词： Dewatering

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Cobalt doped nitrogen-vacancies-rich C3N5 with optimizing local electron distribution boosts peroxymonsulfate activation for tetracycline degradation: Multiple electron transfer mechanisms

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Chemosphere 2023年第1期339卷

作者： Tong, Yao Gao, Peng Xu, Jiacan Liu, Shiqi Yang, Yang Wang, Yang Feng, Li Han, Qi Liu, Yongze Zhang, Liqiu Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China

Heterogeneous photocatalysis coupled with peroxymonosulfate (PMS) activation is considered as an advanced water purification technology for emerging contaminates degradation. In this study, Cobalt (Co) doped nitrogen-vacancies-rich C3N5 photocatalysts (Co/Nv-C3N5) were designed to activate PMS for tetracycline removal. The photo-chemical oxidation system displayed superior advantage, in which the observed rate constant of tetracycline degradation (0.1488 min−1) was 10.86 and 1.82 times higher than that of photo-oxidation and chemical-oxidation systems. Density functional theory calculation results verified the reconstruction of local charge distribution during PMS activation, indicating Co doping and nitrogen-vacancy engineering not only promoted photoelectrons capture, but also boosted electron transfer from the C–N framework to PMS and the generation of active species. Furthermore, several unique multiple electron transfer mechanisms were found in nonradicals (h+, 1O2 and Co(IV)) pathways. Additionally, three possible tetracycline degradation pathways were proposed and the toxicity of the intermediates was evaluated. Overall, the findings from this study provided a novel strategy for developing high-efficient photocatalyst for the rapid degradation of organic pollutants. © 2023

关键词： Chemical activation

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Biochar technology cannot offset land carbon emissions in Guangdong province, China

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Carbon Research 2024年第1期3卷 1-14页

作者： Wang, Funing Zhou, Wenneng Wang, Xili Zhao, Qing Han, Mengjie State Key Lab of Clean Energy Utilization Institute of Carbon Neutrality State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control Zhejiang University Hangzhou310027 China Jiaxing Research Institute Zhejiang University Jiaxing314000 China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China Economic & amp Information center Zhejiang310006 China Department of Earth System Science Ministry of Education Key Laboratory for Earth System Modeling Institute for Global Change Studies Tsinghua University Beijing100084 China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil Sciences Guangdong Academy of Sciences Guangzhou510650 China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangzhou510650 China

As a highly developed region, Guangdong province has substantial industrial emissions. Its subtropical monsoon climate, characterized by abundant hydrothermal conditions, contributes to a substantial biomass potential. The adoption of potential biomass-based carbon dioxide removal (CDR) technologies, such as biochar, presents an opportunity to mitigate emissions and work towards carbon neutrality in the future. However, the current state of the land carbon balance and the CDR potential of biochar in Guangdong province remains unclear. We first calculated the land carbon balance based on inventory data. Then we estimated the CDR potential of biochar derived from agricultural residues, forestry residues, and bioenergy crops cultivated on marginal lands in Guangdong province using life cycle analysis (LCA). Results show that Guangdong province has not yet achieved carbon neutrality, with a net emission (carbon emissions remaining after offsetting by carbon sinks) of 925.63 Tg CO2e (CO2 equivalent, 1Tg = 106 t) in 2021. Emissions from energy consumption account for the highest proportion, contributing 83.8% of total emissions. In the highest biomass utilization scenario, the maximum CDR potential of biochar derived from all biomass types reaches 84.30 Tg CO2e yr-1, which could offset 9.11% of net carbon emissions in Guangdong province. Our findings provide crucial guidance for setting emission reduction targets and implementing effective mitigation strategies in Guangdong province under temperature warming. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

关键词： Carbon capture and utilization

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Nucleophilic hydrolysis of dichloroacetonitrile and trichloroacetonitrile disinfection byproducts by peroxymonosulfate: Kinetics and mechanisms

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Chemosphere 2024年 363卷 142875页

作者： Yu, Yangyi Li, Juan Zhou, Junhui Cao, Ying Guo, Qin Liu, Yongze Yang, Yi Jiang, Jin Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China Advanced Interdisciplinary Institute of Environment and Ecology Guangdong Provincial Key Laboratory of Wastewater Information Analysis and Early Warning Beijing Normal University Zhuhai519087 China Beijing Key Lab for Sources Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China University of Science and Technology of China Anhui 230026 China

In this work, it was found that peroxymonosulfate (PMS) could appreciably accelerate the transformation rates of dichloroacetonitrile (DCAN) and trichloracetonitrile (TCAN) in aqueous solutions, especially under alkaline pHs. The impact of reactive oxygen species scavengers (methyl alcohol for sulfate radical, tert-butyl alcohol for hydroxyl radical, and azide for singlet oxygen) and water matrices (chloride (Cl−), bicarbonate (HCO3−), and natural organic matter (NOM)) on DCAN and TCAN transformation by PMS is evaluated, revealing negligible effects. A nucleophilic hydrolysis pathway, as opposed to an oxidation process, was proposed for the transformation of DCAN and TCAN by PMS, supported by the hydrolyzable characteristics of these compounds and validated through density functional theory calculations. Kinetic analysis indicated that the transformation of DCAN and TCAN by PMS adhered to a second-order kinetic law, with higher reaction rates observed at elevated pH levels within the range of 7.0–10.0. Kinetic modeling incorporating the hydrolytic contributions of water, hydroxyl ion, and protonated and deprotonated PMS (i.e., HSO5− and SO52−) effectively fitted the experimental data. Species-specific second-order rate constants reveal that SO52− exhibited significantly higher reactivity towards DCAN ((1.69 ± 0.22) × 104 M−1h−1) and TCAN ((6.06 ± 0.18) × 104 M−1h−1) compared to HSO5− ((2.14 ± 0.12) × 102 M−1h−1) for DCAN;and (1.378 ± 0.11) × 103 M−1h−1 for TCAN). Comparative analysis of DCAN and TCAN transformation efficiencies by four different oxidants indicated that PMS rivaled chlorine but falls short of hydrogen peroxide, with peroxydisulfate displaying negligible reactivity. Overall, this study uncovers the nucleophilic hydrolysis characteristics of PMS, supplementing its recognized role as an oxidant precursor or mild oxidant, and underscores its significant implications for environmental remediation. © 2024 Elsevier Ltd

关键词： Sulfur compounds

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Enhanced phosphate removal using zirconium hydroxide encapsulated in quaternized cellulose

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Journal of Environmental Sciences 2020年第3期32卷 102-112页

作者： Shuoxun Dong Qinghua Ji Yili Wang Huijuan Liu Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China

Zirconium-based materials are efficient adsorbent for aqueous phosphate ***,current zirconium-based materials still show unsatisfied performance on adsorption capacity and ***,we demonstrate a zirconium hydroxide encapsulated in quaternized cellulose(QC-Zr) for the selective phosphate *** hydroxide nanoparticles were simultaneously generated in situ with the QC framework and firmly anchored in the three-dimensional(3D) cross-linked cellulose *** maximum P adsorption capacity of QC-Zr was 83.6 mg P/***,the QC-Zr shows high P adsorption performance in a wide pH range,generally due to the electrostatic effects of quaternized *** enhanced adsorption of P was also achieved in the presence of competing anions(including Cl^-,NO3^-,SO4^2-,SO4^4-) and humic acid(HA) even at a molar ratio up to 20 *** column adsorption capacity of QC-Zr reached 4000 bed volumes(BV) at EBCT=0.5 min as the P concentration decreased from 2.5 to 0.5 mg/*** study revealed that both-N^+(CH3)3 groups and zirconium hydroxide were involved in phosphate adsorption via electrostatic interactions between -N^+(CH3)3 and phosphate,and the formation of zirconium hydrogen phosphate(Zr(HPO4)x).The 31 P nuclear magnetic resonance(NMR) study implied that P surface-precipitated and inner-sphere complexed with zirconium hydroxide at a ratio of 3:1.

关键词： Adsorption Phosphate removal Zirconium hydroxide aerogel Quaternized cellulose

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Effect of anaerobic digested sludge biochar on soil quality improvement: An insight into mechanisms, microbial composition, and toxicity risk assessment

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Chemosphere 2025年 370卷 143948页

作者： Li, Zhuo Hafeez, Farhan Zhang, Jing Chen, Kai Zeng, Bizhen Qi, Feilan Yang, Lan Zhu, Hongtao Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China Offshore Environmental Technology & Services Limited Beijing100020 China Abbottabad Campus Abbottabad22060 Pakistan China Institute of Water Resources and Hydropower Research Beijing100038 China College of Environment and Resources Chongqing Technology and Business University Chongqing400067 China

Biochar is widely acknowledged for its remarkable impact on soil conditioning. However, the influence of different sources of biochar, particularly anaerobic digested sludge biochar (ADBC) derived from anaerobic digested sludge and biochar derived from waste activated sludge, on alkaline soil remains largely unexplored. To address this knowledge gap, a comprehensive field experiment was conducted over a period of 180 days to investigate the effects of ADBC on slightly alkaline soil. This study evaluated various aspects, including soil properties, nutrient content, microbial composition, and soil toxicity. The results demonstrated significant improvements in the quality of alkaline soil following the application of ADBC. Notably, soil pH decreased from 8.24 to 7.5, while conductivity increased from 56.7 μs/cm to 249.0 μs/cm, total organic carbon from 13.5 g/kg to 19.9 g/kg, available nitrogen from 45.5 g/kg to 237.5 g/kg, and available phosphorus from 549.5 g/kg to 1396.7 g/kg. Moreover, ADBC substantially increased the relative abundance of functional bacteria associated with nutrient cycling, such as Proteobacteria, Actinobacteriota, and Bacteroidota. Conversely, the assessment of biotoxicity revealed a decrease in toxicity with increasing preparation temperature and particle size. These findings highlight the promising potential of ADBC for improving the key properties of alkaline and nutrient-poor soils crucial for overall soil productivity. © 2024 Elsevier Ltd

关键词： Alkaline soil Biochar Anaerobic digested sludge Nutrient boost Bacterial community Toxicological analysis

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Uncovering the Role of Free Lanthanum (La3+) Ions and La Oligomer on the Surface of La (Oxy)Hydroxide Particles for Phosphate Removal

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SSRN 2024年

作者： Xiao, Feng Li, Yongqi Xia, Yuanchen Zhang, Jianing Dong, Shuoxun Wang, Yili School of Water Resources and Hydropower Engineering North China Electric Power University Beijing102206 China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China

La (oxy)hydroxide-based materials have been recognized as promising adsorbents for aqueous phosphate (P) removal. However, comprehending the adsorption behavior of P onto La (oxy)hydroxide particles remains challenging, given the heterogeneous low-crystalline surface encompassing La oligomers and free La3+ ions. In this study, a hydrogen (H) bond capping method was developed to construct La (oxy)hydroxide oligomers (LHOs) to simulate the low-crystalline La on the surface of La (oxy)hydroxide particles. The P uptake capacity was compared among free La3+ ions, LHOs, and La nanoparticle (La-NP) with maximum capacities of 1.97×103 mg/g, 6.65×102 mg/g and 1.04×102 mg P/g, respectively. The FT-IR, Raman, in situ-XRD and XPS deconvolution analyses revealed that the removal of P by free La3+ ions was achieved through the formation of LaPO4·0.5H2O, while the LaOOH in LHOs undergoes hydroxyl ion exchange with P. Based on this study, the free La3+ ions and La oligomers on the surface of La (oxy)hydroxide particles play a primary role in P adsorption. These results also suggest that the successively decreased adsorption capacity of La (oxy)hydroxide-based adsorbents in the continuously adsorption/desorption cycles might be due to the irreversible inactivation and recrystallization of free La3+ ions and La oligomers on the surface. © 2024, The Authors. All rights reserved.

关键词： Ions

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Combining experiments to elucidate carbon dioxide absorption in amino acid-anion based ionic liquids at the molecular level

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Journal of Molecular Liquids 2024年 415卷

作者： Han, Bingyi Lun, Xiaoxiu Zhang, Jing Ma, Weifang Qiao, Qunbo Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Institute of Process Engineering Chinese Academy of Science Beijing100190 China School of Ecology and Nature Conservation Beijing Forestry University Beijing100083 China

Amino acid ionic liquids (AAILs) have good absorption performance for carbon dioxide (CO2). However, there is no unified understanding of the absorption mechanism. In this study, synthesis and characterization of four ionic liquids (ILs) based on amino acid (aminate) anions, namely 1-butyl-3-methylimidazolium L-alaninate ([BMIm]Ala), 1-butyl-3-methylimidazolium arginate ([BMIm]Arg), 1-butyl-3-methylimidazolium glycinate ([BMIm]Gly) and 1-butyl-3-methylimidazolium lysinate ([BMIm]Lys), were accomplished, where the cation adopted was [BMIm]+. Further, their CO2 absorption capacities were examined. The CO2 molar uptake rankings for the investigated aminate-ILs are [BMIm]Arg > [BMIm]Lys > [BMIm]Gly > [BMIm]Ala, with [BMIm]Arg displaying stronger CO2 absorption (0.85 mol CO2/mol IL under 10.0 bar). In contrast to non-functionalized ILs and amine functionalized cation ILs, the CO2 solubility of as-synthesized aminate-ILs is higher. More importantly, the Quantum Theory of Atoms-in-Molecules (QTAIM) at the M06-2X/6-311++G(d, p) level was exploited to theoretically explore the CO2 absorption mechanism and kinetics of the aminate-ILs. It was found that the alkyl chain length along with the quantity of amine (–NH2) groups in aminate anions affected their absorption of CO2. Facilitated absorption of CO2 was noted when the amine group quantity of ILs structures rose. The chemisorption nature was determined according to the enthalpy changes in the process of CO2 capture. As suggested by the kinetic findings, [BMIm]Gly exhibited higher absorption rate of CO2 compared to [BMIm]Ala, since the steric hindrance in the latter is higher because of an extra methyl group in the aminate chain. Additionally, topological exploration revealed that the C–N bond critical point had a covalent nature, indicating that CO2 capture was a chemisorption event. In conclusion, based on the kinetic energy findings combined with the interaction and topological analyses, [BMIm]Arg was identified as the opt

关键词： Amino acids

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Enhanced Catalytic Oxidation of Toluene with a Mnox/Copper Mesh Monolithic Catalyst Prepared Using One-Step Electrodeposition Method

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SSRN 2024年

作者： Zhang, Yue Gao, Yanshan Wang, Qiang Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry University Beijing100083 China

Catalytic combustion is a highly efficient technology for reducing VOCs, and the development of monolithic catalysts with superior catalytic activity suitable for industrial applications is crucial. In this study, a novel MnOx/copper mesh (CM) monolithic catalyst was prepared for toluene oxidation using a one-step electrodeposition method. The effect of deposition conditions on the catalytic performance of MnOx/CM monolithic catalysts was systematically investigated by varying the deposition time, electrolyte concentration and deposition voltage. Due to good low-temperature reducibility and higher Mn4+ and Olatt content, the T50% and T90% of 1.24-0.2 MnOx/CM-60 catalyst could reach 229 oC and 242 oC, respectively. Furthermore, the catalyst exhibited excellent water tolerance, cycling and long-term stability. In-situ DRIFTS analysis confirmed a possible degradation pathway in which lattice oxygen in the catalyst oxidized the adsorbed toluene molecules to form intermediates (benzyl alcohol and benzoate). Subsequent replenishment of gaseous oxygen (involving oxygen vacancy creation-disappearance) led to aromatic ring breakage and the intermediates were further oxidized to maleate and finally to CO2 and H2O. This study provides a reference for the in-situ construction of low-cost metal-based monolithic catalysts for VOCs catalytic oxidation. © 2024, The Authors. All rights reserved.

关键词： Electrodeposition

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Rapid Removal of Low-Level Phosphate by La-Cit Hybridized with Fe₃O₄: Performance and Mechanism Analysis

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SSRN 2025年

作者： Hao, Haotian Huang, Xu Zhang, Yao Xu, Shuo Wang, Yili Shi, Baoyou Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China

The effective elimination of low-level phosphate from aqueous systems is critical for mitigating eutrophication and enhancing aquatic ecological sustainability. In this study, a regenerable magnetic composite, designated as MLCit, was synthesized via an in-situ embedding method. This composite integrates a novel phosphate-binding lanthanum citrate complex (La-Cit) with Fe₃O₄ nanoparticles to achieve efficient phosphate removal. Comparative analysis revealed that MLCit exhibits enhanced adsorption performance relative to four other magnetic lanthanum-based composites (La3+/Fe3O4, La2(CO3)3/Fe3O4, La(OH)3/Fe3O4, and La2O3/Fe3O4). Specifically, MLCit demonstrated a phosphate adsorption capacity 1.5–9 times higher than these counterparts, with an initial adsorption rate 1.46–2.22 times greater. Structural characterization confirmed that MLCit-41 (La/Fe molar ratio = 4:1) adopts a core-shell structure, comprising Fe3O4 nanoparticles encapsulated by amorphous La-Cit. The maximum adsorption capacity of MLCit-41 reached 77.85 mg P/g, with equilibrium achieved within 3 h at a dosage of 0.5 g/L. MLCit-41 exhibited broad pH applicability (4–11), exceptional selectivity for phosphate, and achieved residual phosphate concentrations below 0.05–0.1 mg P/L in four environmental water samples (TP © 2025, The Authors. All rights reserved.

关键词： Eutrophication

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