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SSRN 2022年

作者： Wei, Shuangshuang Zhou, Chang Zhang, Guoyang Zheng, Hongcen Chen, Zhihao Zhang, Shujuan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Organoarsenics pose a severe threat to the environment and human health. In aquatic environment, dissolved organic matter (DOM)-mediated photochemical transformation is one of the main processes in the fate of variant pollutants, including organoarsenics. Dicarbonyl is a typical redox-active moiety in DOM. However, the knowledge on the photoconversion of organoarsenics by DOM, especially the contributions of dicarbonyl moieties is still limited. Here, we systematically investigated the photochemical transformation of three organoarsenics with the simplest β-diketone, acetylacetone (AcAc), as a model dicarbonyl moiety of DOM. The results demonstrate that AcAc was a potent photo-activator and oxygen-depleting agent, which could significantly enhance the photochemical transformation of roxarsone (ROX). At a 1:1 molar ratio of AcAc to ROX, the photochemical transformation rate of ROX was increased by 7 folds. In O2-rich environment, singlet oxygen, peroxide radicals, and ·OH were the main reactive species that led to the breakage of the C-As bond in ROX and the oxidation of the released arsono group to arsenate, whereas the triplet-excited state of AcAc (3AcAc*) and carbon-centered radicals from the photolysis of AcAc dominated in the reductive transformation of ROX. In anoxic environment, 3-amino-4-hydroxyphenylarsonic acid was one of the main reductive transformation intermediates of ROX, whose photolysis rate was about 35 times that of ROX. The knowledge obtained here is of great significance to better understand the fate of organoarsenics in natural environment. © 2022, The Authors. All rights reserved.

关键词： Dissolved oxygen

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Energy-efficient removal of carbamazepine in solution by electrocoagulation-electrofenton using a novel P-rGO cathode

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Journal of Environmental Sciences 2022年第5期34卷 88-102页

作者： Zhihui Xiao Tingyu Cui Zhenbei Wang Yan Dang Meijie Zheng Yixinfei Lin Zilong Song YipingWang Chao Liu Bingbing Xu Amir Ikhlaq Jolanta Kumirska Ewa Maria Siedlecka Fei Qi Beijing Key Lab for Source Control Technology of Water Pollution School of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Jiangsu Key Lab of Industrial Pollution Control and Resource Reuse School of Environmental EngineeringXuzhou University of TechnologyXuzhou 221018China State Key Lab of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Institute of Environment Engineering and Research University of Engineering and TechnologyGT Road54890LahorePunjabPakistan Faculty of Chemistry University of GdanskWita Stwosza 6380-308 GdanskPoland

In this study,carbamazepine(CBZ)decay in solution has been studied by coupling electro-coagulation with electro-Fenton(EC-EF)with a novel P-rGO/carbon felt(CF)cathode,aiming to accelerate the in-situ generation of·OH,instead of adding Fe2+and ***,the fabri-cated P-rGO and its derived cathode were characterized by XRD,SEM,AFM,XPS and electro-chemical test(EIS,CV and LSV).Secondly,it was confirmed that the performance in removal efficiency and electric energy consumption(EEC)by EC-EF(kobs=0.124 min^(-1),EEC=43.98 kWh/kg CBZ)was better than EF(kobs=0.069 min^(-1),EEC=61.04 kWh/kg CBZ).Then,P-rGO/CF(kobs=0.248 min^(-1),EEC=29.47 kWh/kg CBZ,CE=61.04%)showed the best performance in EC-EF,among all studied heteroatom-doped graphene/*** superior performance may be associated with its largest layer spacing and richest C=C,which can promote the electron transfer rate and conductivity of the ***,more H2O2 and·OH could be produced to degrade CBZ,and almost 100%CBZ was removed with kobs being 0.337 min^(-1) and the EEC was only 24.18 kWh/kg CBZ,under the optimal conditions(P-rGO loading was 6.0 mg/cm^(2),the current density was 10.0 mA/cm^(2),the gap between electrode was 2.0 cm).Additionally,no matter the influent is acidic,neutral or alkaline,no additional pH adjustment is required for the effluent of *** last,an inconsecutive empirical kinetic model was firstly estab-lished to predict the effect of operating parameters on CBZ removal.

关键词： Carbamazepine Electro-fenton Electrocoagulation Empirical kinetic model P-rGO

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Enhanced sludge dewaterability using a bifunctional hybrid coagulant

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Chemosphere 2023年 344卷 140323页

作者： Shen, Shaohang Xia, Wei Luo, Zhang Pan, Yu Hu, Pan Zhang, Longguan Shi, Hongtao Yang, Hu State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China China Railway Engineering Services Co. Ltd. Chengdu610083 China

The combination of coagulation and addition of skeleton builder is a popular pretreatment method to improve the dewaterability of sludge. In this study, a novel bifunctional inorganic/organic hybrid coagulant (CS–Si@ATP) was designed and obtained by chemically coupling a cationic starch (CS) with a popular clay, that is, attapulgite (ATP), via a silane coupling agent (APTES) for one-step conditioning of sludge. CS-Si@ATP can evidently enhance the sludge dewatering performance compared with CS, ATP, and their simple combination due to the distinct dual functions of this hybrid coagulant. The tentacle-like cationic CS in CS-Si@ATP shows efficient charge neutralization effect to aggregate and precipitate the suspended solids for further formation of compact sludge cakes. Meanwhile, the internal ATP with a stable and rigid structure acts as the skeleton builder to notably improve the filterability and permeability of the sludge cakes. The synergistic effects of CS and ATP in CS-Si@ATP, i.e., the charge neutralization of CS and the skeleton construction of ATP, cause the evidently enhanced sludge dewaterability, with a filter cake moisture content approximately 78.30% after the mechanical dewatering at 0.05 MPa. In comparison with the traditional two-step combination process by separated addition of CS and ATP, the one-step addition of CS-Si@ATP can reduce the required ATP dose nearly an order of magnitude. Thus, CS-Si@ATP has the notable advantages of simple operation, efficient utilization of ATP and evident reduction of disposal cost. This study provides an environmentally friendly and cost-effective coagulant to further improve the dewaterability of sludge. © 2023 Elsevier Ltd

关键词： Starch

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Deciphering Heterojunction Layered Double Hydroxide-Polyaniline-Carbon Nanotubes for Phosphorus Capture in Capacitive Deionization

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SSRN 2024年

作者： Zhang, Hao Wang, Qiaoying Liu, Jiaxiang Zhang, Tong Gu, Hongbo Wu, Zhichao Wang, Zhiwei State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and Engineering Tongji University Shanghai200092 China

The capacitive deionization (CDI) has emerged as a robust technology due to its effective performance in removing and recovering phosphate in wastewater. However, there are still challenges in achieving fast charge transfer and high capacity phosphorus storage simultaneously. In this study, a novel layered double hydroxide-polyaniline-carbon nanotubes composite material (ZnFe-PANI/CNT) with heterojunction and pseudocapacitive characteristics was fabricated via a simple and effective precipitation strategy. The existence of heterojunction and pseudocapacitance of ZnFe-PANI/CNT was confirmed through material performance testing Moreover, with its fast charge transfer and high ion storage performance, it was achieved high phosphate adsorption efficiency (94%) and sustainable electrode regeneration in low concentration phosphate wastewater. Ultraviolet photoelectron spectroscopy (UPS) and density functional theory revealed the ability to accelerate charge transfer, which was contributed by the heterojunction ZnFe-PANI/CNT. In addition, it was found that the synergies of electrostatic attraction, ligand exchange and surface complexation contributed to the high phosphate capture ability in the acidic environments. The binuclear bidentate or mononuclear bidentate structures dominated the surface configuration of phosphate adsorption at pH 4–9. © 2024, The Authors. All rights reserved.

关键词： Density functional theory

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Electro-enhanced metal-free peroxymonosulfate activator coupled with membrane-assisted process for simultaneous Ni-EDTA decomplexation and Ni ions recovery

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Chemosphere 2023年第1期338卷 139447页

作者： Zhang, Jiaming Yu, Chao Xu, Longqian Zhao, Zhenyu Wu, Deli State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Electro-enhanced metal-free boron/peroxymonosulfate (B/PMS) system has demonstrated potential for efficient metal-organic complexes degradation in an eco-friendly way. However, the efficiency and durability of the boron activator are limited by associated passivation effect. Additionally, the lack of suitable methods utilizing in-situ recovery of metal ions liberated from decomplexation causes huge resource waste. In this study, B/PMS coupled with a customized flow electrolysis membrane (FEM) system is proposed to address above challenges with Ni-EDTA used as the model contaminant. Electrolysis is confirmed to remarkably promote the activation performance of boron towards PMS to efficiently generate •OH which dominated Ni-EDTA decomplexation in the anode chamber. It is revealed that the acidification near the anode electrode improves the stability of boron by inhibiting passivation layer growth. Under optimal parameters (10 mM PMS, 0.5 g/L boron, initial pH = 2.3, current density = 68.87 A/m2), 91.8% of Ni-EDTA could be degraded in 40 min, with a kobs of 6.25 × 10−2 min−1. As the decomplexation proceeds, nickel ions are recovered in the cathode chamber with little interference from the concentration of co-existing cations. These findings provide a promising and sustainable strategy for simultaneous metal-organic complexes removal and metal resources recovery. © 2023

关键词： Metal recovery

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Enhanced hydrodechlorination of 4-chlorophenol through carboxymethylcellulose-modified Pd/Fe nanosuspension synthesized by one-step methods

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Chemosphere 2024年 356卷 141857页

作者： Qiao, Juan Zhao, Zhenyu Zhou, Zhengwei Wu, Deli State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources Shanghai Institute of Pollution Control and Ecological Security Tongji University Shanghai200092 China

Palladized iron (Pd/Fe) represents one of the most common modification strategies for nanoscale zero-valent iron (nZVI). Most studies prepared Pd/Fe by reducing iron salts and depositing Pd species on the surface of pre-synthesized nZVI, which can be called the two-step method. In this study, we proposed a one-step method to obtain Pd/Fe by the concurrent formation of Fe0 and Pd0 and investigated the effects of these two methods on 4-chlorophenol (4-CP) removal, with carboxymethylcellulose (CMC) coated as a surface modifier. Results indicated that the one-step method, not only streamlined the synthesis process, but also Pd/Fe-CMCone-step, synthesized by it, exhibited a higher 4-CP removal rate (97.9%) compared to the two-step method material Pd/Fe-CMCtwo-step (82.4%). Electrochemical analyses revealed that the enhanced activity of Pd/Fe-CMCone-step was attributed to its higher electron transfer efficiency and more available reactive species, active adsorbed hydrogen species (Hads*). Detection of intermediate products demonstrated that, under the influence of Pd/Fe-CMCone-step, the main route of 4-CP was through hydrodechlorination (HDC) to form phenol and H* was the main active specie, supported by EPR tests, quenching experiments and product analysis. Additionally, the effects of initial 4-CP concentration, initial pH, O2 concentration, anions such as Cl−, SO42−, HCO3−, and humic acid (HA) were also investigated. In conclusion, the results of this study suggest that Pd/Fe-CMCone-step, synthesized through the one-step method, is a convenient and efficient nZVI-modifying material suitable for the HDC of chlorinated organic compounds. © 2024 Elsevier Ltd

关键词： Palladium

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Synergistic effects of tree-herb intercropping on the phytoremediation efficiency of cadmium and lead contaminated soil

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Science of the Total Environment 2024年 954卷 176709页

作者： Zhang, Chentao Zha, Yidi Guang, Penghong Ai, Fuxun Yin, Ying Guo, Hongyan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Joint International Research Centre for Critical Zone Science-University of Leeds and Nanjing University Nanjing University Nanjing210023 China

Tree-herb intercropping has emerged as an effective strategy for the remediation of soil contamination. In this study, the effects of intercropping willow with herbaceous plants Lolium perenne L., Iris lactea Pall. and Bidens pilosa L. were investigated on the phytoremediation of Cd- and Pb-contaminated soil. After a 90-day of cultivation, the results showed that intercropping stimulated the phytoremediation efficiency through increased metal accumulation in plants. Intercropping caused a significant (p © 2024 Elsevier B.V.

关键词： Soil pollution

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Self-Assembled 2d-Metal-Organic Framework/Graphene Oxide Composite Membrane for Separating Multi-Component Pollutant-Oil-Water Emulsion

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SSRN 2023年

作者： He, Xuanting Li, Boyu Liu, Jiaxiang Liu, Huachen Tao, Wenquan Li, Zhuo State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Complex multi-component pollutant-oil-water emulsions have caused serious environmental problems and increased the difficulty of purification treatment based on membrane technology in the last few decades. The membrane based on two-dimensional (2D) materials can rationally control the interlayer distance, thus improved the selectivity and permeability separation performance of the membrane for complex wastewater. We herein reported a composite membrane (CPG) based on electrostatic vacuum-assisted self-assembly, in which a 2D metal-organic frameworks (MOFs) Co-CAT-1 with super-hydrophilicity cross-linked by polyethylene imine (PEI) was integrated into graphene oxide (GO) and then coated on polyvinylidene fluoride (PVDF) membrane. The CPG membrane exhibited highly efficient in separating oil-water emulsions, achieving a flux of 219 L∙m−2∙h−1∙bar−1 and a separation efficiency of 99.2%. Simultaneously, this membrane provided favorable separation conditions for simulated emulsion containing dyes and heavy metal ions. Specifically, the separation efficiency after several cycles was maintained greater than 99.0% for dyes and 76% for heavy metal ions (Ni2+, Pb2+, Zn2+). The excellent reusability of CPG membrane for purify the complex oil-in-water emulsions can be attributed to PEI acted as a linker bridge to generate stable bridged network structures in the membrane due to hydrogen bonding, electrostatic attraction and π−π stacking. This work aims to introduce a novel strategy to construct stable and multifunctional membranes for separating pollutant-oil-water emulsions with multi-component by employing a rational design approach of 2D membrane materials. © 2023, The Authors. All rights reserved.

关键词： Graphene

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Microbial and functional resilience of a flocculent sludge-based partial denitrification-anammox system against cold temperature

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Bioresource Technology 2025年 433卷 132706页

作者： Dai, Ben Zhou, Jingzhou Wang, Zuobin Yang, Yifeng Wang, Sen Wang, Zhenyu Yang, Shaobo Xia, Siqing State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China National Engineering Research Center of Dredging Technology and Equipment Key Lab of Dredging Technology CCCC Shanghai200082 China Co. Ltd Shanghai200092 China

The anammox process offers low-carbon, cost-effective solution for municipal wastewater treatment but faces challenges in non-tropical regions due to temperature sensitivity. This study investigated the nitrogen removal performance, microbial dynamics, and functional gene responses of an integrated partial denitrification-anammox (PDA) system using flocculent sludge under gradual and sudden temperature declines. The PDA process maintained stable nitrogen removal under gradual cooling, with effluent total nitrogen (TN) 2−-supply despite a decreased NO3−-to-NO2− conversion rate. Anammox activity progressively declined with temperature dropped, resulting in higher TN-concentration (reactor-concentration at 2 h, 20°C, ∼19 mg/L at 15 °C and ∼26 mg/L at 10 °C). Notably, anammox bacteria (AnAOB) remained functional despite reduced abundance. However, sudden cooling caused irreversible damage to AnAOB (cell may rupture), leading to NH4+-accumulation and system failure. Overall, these findings provide important insights into extending anammox technology to non-tropical wastewater treatment, enhancing its sustainable application. © 2025 Elsevier Ltd

关键词： Nitrogen removal

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Palladium Nanoparticles Facilitated Fast Debromination and Complete Mineralization of Tetrabromobisphenol S (Tbbps) Through Coupling Catalytic Hydrodehalogenation with Advanced Oxidation Processes

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SSRN 2024年

作者： Zheng, Xiong Ma, Yuanyuan Wu, Yang Chen, Lang Long, Min Chen, Yinguang State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment School of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Brominated organic pollutants (BOPs), classified as persistent organic pollutants (POPs), have raised environmental concerns. This study coupled in situ catalytic hydrodehalogenation (HDH) with advanced oxidation process (AOP) facilitated by palladium nanoparticles (PdNPs), for the removal and mineralization of TBBPS. The heterogeneous catalytic HDH over PdNPs achieved a TBBPS conversion to bisphenol S (BPS) with a debromination efficiency of nearly 99% in 1 hour under near-neutral conditions. Additionally, the in situ generated Br- synergistically promoted the mineralization removal of BPS during the AOP (over 99% removal within 20 min). 1O2 produced by activated peroxymonosulfate (PMS) was the most effective active substance for degrading BPS. Combining experimental data and theoretical calculation analysis, a plausible degradation pathway for TBBPS was proposed. ECOSAR prediction indicated that the coupling method substantially diminishes the biotoxicity of the substrates through debromination and mineralization. These findings substantiate a promising coupling method for the elimination of halogenated organic compounds. © 2024, The Authors. All rights reserved.

关键词： Organic pollutants

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