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pollution Characteristics of Typical Args in the Sediments of the Sea Area Adjacent to the Yangtze Estuary, China

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SSRN 2022年

作者： Zhang, Zhiqiang Peng, Huaxia Guo, Yaqi Zhang, Jiao He, Juan Xia, Siqing State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China School of Municipal and Ecological Engineering Shanghai Urban Construction Vocational College Shanghai200432 China State Key Laboratory of Marine Geology Tongji University Shanghai200092 China

The pollution characteristics of the typical antibiotic resistance genes (ARGs) in the sediments of the sea area adjacent to the Yangtze Estuary, China were investigated with both seasonal and spatial insights. The positive rates of sulfonamides sul 1, sul 2, tetracycline tet W and quinolone gyr A resistance genes in the sediments of all sampling sites were 100%, indicating that the sea area adjacent to the Yangtze Estuary were extensively polluted by these ARGs. Occupying a dominance in most sampling sites, sul 1 was found to be the dominant resistance gene in the sediments of the sea area adjacent to the Yangtze Estuary. In terms of seasonal variation characteristics, the absolute abundance of ARGs in flood season was higher than that in dry season. In terms of spatial distribution characteristics, the ARGs concentrations in the south sites were mostly higher than those in the north, and the high abundance sites mostly located near the coast. Different ARGs had different spatial distribution characteristics. The results could provide basic data for the research on the pollution evolution of ARGs in the Yangtze Estuary. © 2022, The Authors. All rights reserved.

关键词： Sediments

Degradation of Odorous 2,4,6-Trichloroanisole in Chlorinated Water by Uv-Led/Chlorination: Kinetics and Influence Factors

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SSRN 2022年

作者： Zhang, Yun-Lu Lin, Yi-Li Zhang, Tian-Yang Lu, Yong-Shan Zhou, Xiao-Yang Liu, Zhi Zheng, Zheng-Xiong Xu, Meng-Yuan Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung824 Taiwan

2,4,6-Trichloroanisole (2,4,6-TCA) has aroused a special concern for their odor problem and potential threats. In this study, the degradation of 2,4,6-TCA by UV/chlorination with different UV light sources was compared, including low-pressure mercury lamp (LPUV, 254 nm) and ultraviolet light-emitting diode (UV-LED, 275 and 285 nm). The maximum removal of 2,4,6-TCA can be achieved by 275 nm UV-LED/chlorination in neutral and alkaline conditions was 80.0%. The reaction, kinetics and water matrix parameters on 2,4,6-TCA degradation were also evaluated. During UV-LED (275 nm)/chlorination, 2,4,6-TCA degradation was mainly caused by direct UV photolysis and indirect hydroxyl radical (HO•) oxidation, while reactive chlorine radicals (RCSs) had a negligible contribution. The second-order rate constant between HO• and 2,4,6-TCA was determined as 3.1×109 M-1s-1. Increasing initial chlorine dosage and decreasing 2,4,6-TCA concentration or pH value signiﬁcantly promoted 2,4,6-TCA degradation during UV/chlorination process. The presence of natural organic matter (NOM) and bicarbonate (HCO3-) can inhibit 2,4,6-TCA degradation, while chloride ion (Cl-) had a negligible effect. The kinetic model for 2,4,6-TCA degradation was established and validated, and the degradation pathways were proposed based on the identified intermediates. Furthermore, UV-LED (275 nm)/chlorination also exhibited a promising effect on 2,4,6-TCA removal in real water, which can be used to control 2,4,6-TCA pollution and odor problems. © 2022, The Authors. All rights reserved.

关键词： Chlorine

Carbonized bacterial cellulose/FeMn composite as efficient catalyst toward contaminant degradation: The crucial role of hydrogen reduction

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Chemosphere 2023年第1期335卷 139176页

作者： Liu, Fei You, Jikang Duan, Chongsen Li, Zhe Xu, Huacheng State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing210008 China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology 200 Xiao Ling Wei Nanjing210094 China CAS Key Lab of Reservoir Environment Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China

The structure especially the active site manipulation of Fenton-like catalysts was essential for the efficient removal of organic contaminants in the aquatic environment. In this study, the carbonized bacterial cellulose/FeMn oxide composite (CBC@FeMnOx) were synthetized and modified by hydrogen (H2) reduction to obtain the carbonized bacterial cellulose/FeMn composite (CBC@FeMn), with emphasis on the processes and mechanisms for atrazine (ATZ) attenuation. The results showed that H2 reduction did not change the microscopic morphology of the composites but destroy the Fe–O and Mn–O structures. Compared with the CBC@FeMnOx composite, the H2 reduction could promote the removal efficiency from 62% to 100% for CBC@FeMn, as well as the enhancement of degradation rate from 0.021 min−1 to 0.085 min−1. The quenching experiments and electron paramagnetic resonance (EPR) displayed that the hydroxyl radicals (•OH) was the major contributor for ATZ degradation. The investigation for Fe and Mn species indicated that H2 reduction could increase the content of Fe(II) and Mn(III) in the catalyst, thus improving the generation of •OH and accelerating the cycle process between Fe(III)/Fe(II). Owing to the excellent reusability and stability, it was indicated that the H2 reduction can be considered as an efficient way to regulate the chemical valence of the catalyst, thus enhancing the removal efficiency of aquatic contaminants. © 2023 Elsevier Ltd

关键词： Oxidation

Carbon Doped and Ptcda Co-Construct Direct Z-Scheme Heterojunction to Tune Boron Nitride for Boosted Photosynthesis Hydrogen Peroxide

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SSRN 2023年

作者： Guo, Yong Miao, Xudong Zhang, Xueyang Che, Huinan Li, Ying Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing210098 China Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental Engineering Xuzhou University of Technology Xuzhou221018 China State Key Laboratory of Treatments and Recycling for Organic Effluents by Adsorption in Petroleum and Chemical Industry Soochow University Suzhou215123 China

The development of novel metal-free catalysts to photosynthesis hydrogen peroxide (H2O2) is recognized as a prospective technology for sustainable energy conversion. Herein, the carbon-doped boron nitride (BCN) and perylene tetracarboxylic dianhydride (PTCDA) formed PDA@BCN heterojunctions with π-π stacking, which catalyzed the production of H2O2 at an unexpectedly high yield of 285.47 μmol h-1 g-1 in air. The high photocatalytic performance is attributed to the enhanced light absorption resulting in abundant carrier excitation, rapid charge separation driven by direct Z-scheme heterojunctions, and highly selective H2O2 formation pathway. Theoretical calculations demonstrate that carbon sites in PDA@BCN can serve as an advanced active center for oxygen enrichment and activation, promoting oxygen reduction and efficient photocatalytic production of H2O2. This work lays the foundation for the design of efficient, stable, and reusable photocatalysts for environmental restoration and energy conversion. © 2023, The Authors. All rights reserved.

关键词： III-V semiconductors

Enhanced Ammonia-Rich Solution Production and Electrode Separation Using Magnetic Nickel-Loaded Carbon Black in Flow-Electrode Electrochemical Deionization (Feed)

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SSRN 2022年

作者： Chen, Taoqin Xu, Longqian Wei, Sheng Tang, Xianchun Chen, Hongbin State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China

Carbon materials with abundant micropores and large specific capacitance (e.g., activated carbon, AC) are usually considered to be ideal candidates for flow-electrode capacitive deionization and are now widely employed to the ammonia recovery from wastewater. However, the microporous structure endows AC with a strong adsorption capacity toward ammonia nitrogen, which greatly reduces the recovery efficiency. In this study, magnetic nickel-loaded carbon black (Ni 0 -CB) particles were simply synthesized by impregnating Ni onto the surface of the carbon black (CB) particles, endowing no less than 50% of electrical energy savings and increasing ammonia recovery efficiency by ~20% in comparison to AC. When charging, and were migrated to the cathode, with the conversion of into was accelerated due to the higher pH of Ni-CB systems. The excellent electrical conductivity of Ni-CB greatly decreased the electrical energy consumption. Followed by reverse discharge, and less would be turned back into the spacer chamber;the adsorption toward NH 3 was effectively reduced. Thus, was more likely to be retained in the electrolyte. In addition, the introduction of magnetic Ni-CB in flow-electrode electrochemical deionization technology realized the improved ammonia-rich solution production and the recycling of carbon particles without additional solid–liquid separation (i.e., filtration, settlement). © 2022, The Authors. All rights reserved.

关键词： Ammonia

For Aqueous/Soil Cadmium Immobilization Under Acid Attack, Does the Hydroxyapatite Converted from Pseudochrobactrum Sp. Dl-1 Induced Vaterite Necessarily Show Higher Stability?

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SSRN 2024年

作者： Sheng, Mingping Liu, Yikai Zeng, Guoquan Zhang, Qingquan Peng, He Lei, Lin Liu, Huakang He, Nan Xu, Heng Guo, Hongyan College of Medical Technology Chengdu University of Traditional Chinese Medicine Chengdu610075 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education College of Life Science Sichuan University Chengdu610065 China Key Laboratory of Environment Protection Soil ecological protection and pollution control Sichuan University Department of Ecology and Environment of Sichuan Chengdu610065 China Joint International Research Centre for Critical Zone Science University of Leeds Nanjing University Nanjing210023 China Quanzhou Institute for Environment Protection Industry Nanjing University Quanzhou362000 China

Microbial induced carbonate precipitation (MICP) technology was widely used to immobilize heavy metals, but its long-term stability is difficult to maintain, especially under acid attack. In this study, the hydrothermal conversion of Pseudochrobactrum sp. DL-1 induced vaterite (the rare crystalline phase of CaCO3) to hydroxyapatite (HAP) at 30℃ was successful. The dissolution of CdCO3containing vaterite and the simultaneous recrystallization of Ca4.03Cd0.97(PO4)3(OH)containing HAP was the main conversion mechanism. For aqueous Cd immobilization, stability test at pH 2.0~10.0 showed that the Cd2+ desorption rate of Cd-adsorbed vaterite (3.58~4.32 ‰) were 6.88~22.72 times higher than that of Cd-adsorbed HAP (0.18~0.52 ‰). For soil Cd immobilization under 60 days of acid-rain erosion, the highest immobilization rate (51.00%) of exchangeable-Cd and the lowest dissolution rate (-0.18%) of carbonate-Cd were realized via 2% vaterite, while the corresponding rates were 16.78 % and 1.31 % via 2% HAP. Besides, vaterite showed better performance than HAP at soil ecological comprehensive evaluation. In brief, for Cd immobilization via MICP under acid attack, DL-1 induced vaterite showed direct application value based on excellent stability in soil and water, while the mineral conversion method we offered is valuable for further improving the stability in water. © 2024, The Authors. All rights reserved.

关键词： Hydroxyapatite

controls on Sedimentary Arsenic Accumulation in the Datong Basin: Paleoclimatic Changes Driven by Tectonic Uplift?

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SSRN 2022年

作者： Liu, Wenjing Xie, Xianjun Pi, Kunfu Wang, Yanxin School of Environmental Studies State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan430074 China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution Ministry of Ecology and Environment Wuhan430074 China University of Waterloo Canada

The variation of sedimentary As burial has been reported in geological timescales, but detailed pathways controlled by tectonic uplift and climatic evolution are poorly understood. To this end, we reconstructed various tectonic and climatic stages utilizing geochemical indicators and dating data and illustrated the physic-chemical pathways that affect the As accumulation and release. The data showed that three major cyclic climatic changes are observed since the 800 ka and the climatic evolution is a consequence of the relative intensities of East Asian Summer Monsoon (EASM) and East Asian Winter Monsoon (EAWM), which are driven by the uplift of Qinghai-Tibet Plateau (QTP). The higher sedimentary As, Fe and Feclay concentrations are observed in the cold-arid climates and suggest As accumulation is due to strong physical erosion. Moreover, the negative correlations between Feclay, kaolinite and Kao/(It+It/S+C) indicate that illite, chlorite, and illite-smectite mixed layer, which are prevalent in cold-arid climates, enhance Fe-rich clay minerals accumulation and then As burial during the tectonic uplift period. Intense biogeochemical processes prevail and contribute to crystalline Fe enrichment during the tectonic stability period. Therefore, climate shift driven by tectonic uplift alters solid As partitioning in sedimentary basins and potentially yields significant impacts on global As contamination. © 2022, The Authors. All rights reserved.

关键词： Sedimentology

Comparison of Four Pre-Oxidants Coupled Powdered Activated Carbon Adsorption for Odor Compounds and Algae Removal: Kinetics, Process Optimization, and Formation of Disinfection Byproducts

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SSRN 2023年

作者： Zhao, Heng-Xuan Zhang, Shuang Zhang, Tian-Yang Zhu, Yi-Ping Pan, Ren-Jie Xu, Meng-Yuan Zheng, Zheng-Xiong Hu, Chen-Yan Tang, Yu-Lin Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Shanghai Chengtou Raw Water Limited Company Beiai Road Shanghai200125 China College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai200090 China

This study systematically investigated the combination schemes of four oxidants (KMnO4, NaClO, ClO2, and O3) and powdered activate carbon (PAC) on the inactivation of Microcystis aeruginosa cells and removal of four frequently detected odorants in raw water (diethyl disulfide (DEDS), bis(2-chloroisopropyl)ether (BCIE), 2-methylisoborneol (2-MIB) and geosmin (GSM)). O3 showed highest pseudo-first-order removal rates for all four compounds and NaClO exhibited highest inactivation rates for the cell viability and Chlorophyll a (Chl-a). The Freundlich model fits well for the adsorption of DEDS and BCIE by PAC. The removal of total odorants and algae cells by combined treatment processes, i.e., pre-oxidation/post-PAC and pre-PAC/post-oxidation were lower than that of each scheme alone. Whereas, an enhanced treatment performance can be achieved by prolonging the time interval of oxidation and PAC adsorption. The pre-PAC/post-oxidation processes possess comparable efficiency for the removal of odorants and minor lower inactivation rates of algae cells than pre-oxidation/post-PAC process, but can significantly inhibit the formation of disinfection byproducts (DBPs), especially for the formation of C-DBPs (for NaClO and ClO2), bromate (for O3) and chlorate/chlorite (for ClO2). This study can provide a better understanding of improving in-situ operation of the combined oxidation/PAC system for source water pretreatment. © 2023, The Authors. All rights reserved.

关键词： Chlorine compounds

Three-Dimensional Cobalt Hydroxide Hollow Cube/Vertical Nanosheets with High Desalination Capacity and Long-Term Performance Stability in Capacitive Deionization

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Research 2021年第1期2021卷 606-619页

作者： Yuecheng Xiong Fei Yu Stefanie Arnold Lei Wang Volker Presser Yifan Ren Jie Ma State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Research Center for Environmental Functional Materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092China College of Marine Ecology and Environment Shanghai Ocean UniversityShanghai 201306China INM-Leibniz Institute for New Materials 66123 SaarbrückenGermany Department of Materials Science and Engineering Saarland University66123 SaarbrückenGermany Saarene-Saarland Center for Energy Materials and Sustainability 66123 SaarbrückenGermany Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Faradaic electrode materials have significantly improved the performance of membrane capacitive deionization,which offers an opportunity to produce freshwater from seawater or brackish water in an energy-efficient ***,Faradaic materials hold the drawbacks of slow desalination rate due to the intrinsic low ion diffusion kinetics and inferior stability arising from the volume expansion during ion intercalation,impeding the engineering application of capacitive ***,a pseudocapacitive material with hollow architecture was prepared via template-etching method,namely,cuboid cobalt hydroxide,with fast desalination rate(3.3 mg(NaCl)·g^(-1)(h-Co(OH)2)·min^(-1)at 100 mA·g^(-1))and outstanding stability(90%capacity retention after 100 cycles).The hollow structure enables swift ion transport inside the material and keeps the electrode intact by alleviating the stress induced from volume expansion during the ion capture process,which is corroborated well by in situ electrochemical dilatometry and finite element ***,benefiting from the elimination of unreacted bulk material and vertical cobalt hydroxide nanosheets on the exterior surface,the synthesized material provides a high desalination capacity(117±6 mg(NaCl)·g^(-1)(h-Co(OH)2)at 30 mA·g^(-1)).This work provides a new strategy,constructing microscale hollow faradic configuration,to further boost the desalination performance of Faradaic materials.

关键词： electrode cobalt Cube