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Fabrication of novel thin-film composite membrane based on ultrathin metal-organic framework interlayer for enhancing forward osmosis performance

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Chinese Chemical Letters 2023年第12期34卷 305-309页

作者： Hao Liu Bo Li Pin Zhao Rongming Xu Chuyang Y.Tang Weilong Song Zunaira Habib Xinhua Wang Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Shenergy Environmental Technology Co. Ltd.Hangzhou 31100China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Department of Civil Engineering The University of Hong KongHong Kong SAR 999077China Institute of Environmental Sciences and Engineering School of Civil and Environmental EngineeringNational University of Sciences and TechnologyIslamabad44000Pakistan Department of Chemistry Rawalpindi Women UniversityRawalpindi 46300Pakistan Jjiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

To improve operation efficiency,an interlayered thin-film composite forward osmosis(iTFC-FO)membrane was designed by introducing an ultrathin and porous interlayer based on aluminum tetra-(4-carboxyphenyl)porphyrin(a stable metal-organic framework nanosheet,Al-MOF).Surface characterization results revealed that Al-MoF spread evenly in the macro-porous substrate,and provided a flat and smooth reaction interface with moderate hydrophilicity and uniform small *** resultant polyamide(PA)layer had a thin base(without intrusion into substrate)and crumpled surface(with abundant leaves).The leaves size and cross-linking degree of PA layer firstly increased and then decreased with the Al-MOF *** to the original membrane,the iTFC-FO showed an enhanced water permeability and a reduced reverse sodium flux in both modes of active layer facing feed solution(ALFS)and active layer facing draw solution(AL-DS).To be specific,the specific reverse sodium flux(reverse sodium flux/pure water flux)decreased from 0.27 g/L to 0.04 g/L in the AL-FS mode,while from 1.36 g/L to 0.23 g/L in the AL-DS mode with 2 mol/L NaCl as ***,the iTFC-FO maintained high stability and high permeability under high-salinity and contaminated *** study offers a new possibility for the rational fabrication of high-performance TFC-FO membranes.

关键词： Thin-film composite embrane Forward osmosis 2Dmetal-organic ramework Porous interlayer Membrane prformance

An Efficient Zn/Fe-Nc Catalyst Derived from Bimetallic Zeolitic Imidazole Frameworks for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cell

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SSRN 2023年

作者： Wang, Qianwu Lu, Jingzhao Liu, Songlin Liang, Bolong Yu, Boqu School of Eco-Environment Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands Hebei University Baoding071002 China College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution Control Nankai University Tianjin300350 China College of Science and Technology Hebei Agricultural University Cangzhou061100 China State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210093 China

The development of carbon-based catalysts to substitute Pt-based catalysts for the oxygen reduction reaction is of great importance to promote their practical application in energy conversion. Herein, we prepare Zn/Fe and nitrogen-codoped porous carbon (Zn/Fe-NC-x) as a cathode catalyst via a facile one-step pyrolysis predesigned bimetallic zeolitic imidazole framework. Systematic electrochemical studies demonstrate that the synthesized Zn/Fe-NC-0.5 possesses higher electrocatalytic activity towards oxygen reduction reaction. In particular, Zn/Fe-NC-0.5 has a smaller charge transfer resistance, larger exchange current density, and much higher open circuit potential and mainly proceededs via an efficient four-electron pathway. The microbial fuel cell equipped with the synthesized catalyst exhibits the highest maximum power density of 1954 ± 20 mW m-2. In addition, the effects of the iron doping content on the performance of the oxygen reduction reaction and maximum power density are evaluated: a moderate Fe doping content plays a crucial role in improving the catalytic activity, and the synergistic effect of Fe and N codoping promotes the cathode performance. In brief, Zn/Fe-NC, with advantages of facile synthesis, environmental friendliness and excellent electrochemical activity is a promising Pt-alternative catalyst for air-cathode microbial fuel cells in the future. © 2023, The Authors. All rights reserved.

关键词： Carbon

Enhanced 2-Mib Degradation by Uv-Led/Chlorine Process: Reaction Kinetics, Wavelength Dependence, Influencing Factors and Degradation Pathways

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SSRN 2022年

作者： Luo, Zhen-Ning Zhang, Tian-Yang Xu, Meng-Yuan Fang, Ruo-Fan Wang, Xing-Xing Zheng, Zheng-Xiong Zhao, Heng-Xuan Li, Zong-Chen Tang, Yu-Lin 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

Efficient removal of Dimethylisophthalol (2-methylisoborneol, 2-MIB), a typical odor component, in water treatment plants (WTPs) poses a great challenge to conventional water treatment technology due to its chemical stability. In this study, the combination of ultraviolet light-emitting diode (UV-LED) and chlorine (UV-LED/chlorine) is exploited for 2-MIB removal, and the role of ultraviolet (UV) wavelength was investigated systematically. Results showed that UV or chlorination alone did not degrade 2-MIB effectively, but UV/chlorine process could degrade 2-MIB efficiently, followed pseudo-first-order kinetic model. The 275 nm UV exhibited higher 2-MIB degradation efficiency in this UV-LED/chlorine system than 254 nm UV, 265 nm UV and 285 nm UV due to the highest mole adsorption coefficient and quantum yield of chlorine in 275nm UV. ·OH and ·Cl produced in the 275 nm UV/chlorine system play major roles in 2-MIB degradation. HCO 3 - and Natural organic matter (NOM), which are prevalent in water, consume ·OH and ·Cl, thus inhibiting the 2-MIB degradation by UV-LED/chlorine. In addition, NOM and 2-MIB can form photonic competition effect. The degradation of 2-MIB by UV-LED/chlorine is mainly through dehydration and demethylation, and odorous intermediates such as camphor are produced. Degradation through α bond fracture and six-membered ring opening to form saturated or unsaturated hydrocarbons and aldehydes. Four DBPs, chloroform (CF), trichloroacetaldehyde (TCE), trichloroacetone (TCP) and dichloroacetone (DCP), were mainly generated, and CF was the most significant byproducts. © 2022, The Authors. All rights reserved.

关键词： Degradation

Enhanced Electrochemical Oxidation of Urea Contaminant in Wastewater and Simultaneous H2 Generation Over Highly Active Co-Based Array Catalysts

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SSRN 2024年

作者： Ding, Mingmei Zhang, Sihao Gao, Li Zhou, Houzhen Xu, Hang Tao, Hui Ma, Yue Li, Yang Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Hohai University Nanjing210098 China South East Water Corporation 2268 SeafordVIC3198 Australia School of Environmental and Municipal Engineering Qingdao University of Technology Qingdao266033 China State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security School of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Victoria University Australia

Electrocatalytic degradation of urea contaminant from the wastewater treatment presents great promising to enable green environmental remediation and simultaneously produce clean H2 energy. However, the energy efficiency is mainly restricted by the sluggish urea oxidation reaction (UOR). In this study, we report a temple-assisted approach for the synthesis of Zn doped based-Co nanoarray catalysts for urea electrolysis. The nanoarray structure and Zn doping enlarge the exposure of the active sites and tune the electronic configuration of based-Co catalysts, favoring the HER and UOR. Specifically, Zn-CoSe2 cathode presents a relatively low overpotential (200 mV) and a desirable Faradaic efficiency (97.2%) of HER to support the current density of 100 mA·cm-2 in alkaline solution. When Zn-CoP anode was applied for UOR, the potential of 1.3 V is needed to drive 50 mA·cm-2 in urea-alkaline solution. In situ Raman unveiled that the Se sites are identified as the H2-evolving center while the Co site was responsible for dissociating H2O. Further operando characterization indicated that the shorted oxidation pathway with low Co3+ generation accounts for the efficient urea degradation, which is obviously distinguished from the four-electron-transfer pathway of OER with higher Co4+. This work exhibits significant potential for removing urea from wastewater coupled with economical and sustainable H2 production. © 2024, The Authors. All rights reserved.

关键词： Wastewater treatment

Soil particle and moisture-related factors determine landward distribution of bacterial communities in a lateral riverside continuum of the Xilin River Basin

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Soil Ecology Letters 2021年第4期3卷 303-312页

作者： Jingli Yu Jingjing Xia Qiaoli Ma Chi Zhang Ji Zhao Xininigen Tanggood Yunfeng Yang Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolia Plateau Inner Mongolia Key Laboratory of Environmental Pollution Control&Waste Resource ReuseSchool of Ecology and Environment of Inner Mongolia UniversityHohhot 010021China Ministry of Agriculture Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease College of Veterinary Medicine of Inner Mongolia Agricultural UniversityHohhot 010018China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Continuous landscape components along the lateral riverside are affected by both hydrologic connectivity and *** recent years,anthropogenic activities and climate changes have caused wetland shrinkage and land degradation along the lateral riverside of many arid and semiarid *** microorganisms are major drivers of soil biochemical cycling,it is essential to examine soil microbial communities along the lateral landscape continuum to understand their ecosystem functioning and predict future land ***,we collected samples along a lateral riverbed center-riverbed edge-oxbow lake-floodplain-terrace continuum(i.e.,landward distribution)in the Xilin River Basin,Inner Mongolia,*** floodplain had the highest microbial diversity and heterogeneity,with Bacteroidetes,β-andγ-Proteobacteria being the most abundant *** contrast,the terrace had the lowest microbial diversity and heterogeneity,with Acidobacteria,Actinobacteria,Verrucomicrobia,Gemmatimonadetes,andα-Proteobacteria as the most abundant *** particle,salinity,and moisture were the most influential factors for landward variation of bacterial communities along the riverside ***,we demonstrate that dominant bacterial lineages,soil particles,and moisture-related factors are valuable indicators of this continuum,which can be leveraged for the early prediction of drought-induced wetland shrinkage and grassland desertification.

关键词： Biogeography Landward distribution Lateral riverside continuum Hydrologic connectivity and disconnectivity Bacterial communities Combined environmental factors

An Efficient Zn/Fe-Nc Catalyst Derived from Bimetallic Zeolitic Imidazole Frameworks for Oxygen Reduction Reaction in Air-Cathode Microbial Fuel Cell

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SSRN 2023年

关键词： Carbon

Effects of Low Molecular Weight Organic Acids on the Photodissolution of Commercial Lead Chromate Pigments

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SSRN 2023年

作者： Gao, Han Li, Huixin Zhou, Xinwei Wei, Jing Qu, Xiaolei Long, Tao State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of China Jiangsu Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212100 China

Lead chromate pigments are commonly used yellow inorganic pigments, which can pose environmental risks as they contain toxic heavy metals lead and chromium. Low molecular weight organic acids (LMWOAs), as widespread natural organic matter, affect the photodissolution of lead chromate pigment in water systems. In this work, the role of LMWOAs in the photodissolution of commercial lead chromate pigment was investigated. The pigment underwent significant photodissolution under simulated sunlight exposure with LMWOAs, and subsequently released Cr(III) and Pb(II). Meanwhile, the Cr(VI) content decreased significantly by irradiation time, attributing to the reduction of Cr(VI) to Cr(III). The photodissolution of lead chromate pigment was basically positively related to the total number of hydroxyl and carboxyl groups in LMWOAs. The LMWOAs promoted photodissolution of the pigment by improving the electron-hole separation. The LMWOAs with lower ionization potential and higher energy of the highest occupied molecular orbital had stronger electron-donating power, which thus was favorable to Cr(VI) reduction and pigment photodissolution. This study revealed the photodissolution mechanism of lead chromate pigment mediated by LMWOAs with different molecular structures, which is helpful for understanding the environmental behavior of lead chrome yellow pigment in complex water environment. © 2023, The Authors. All rights reserved.

关键词： Lead compounds

Elevated Co2 Exacerbates Effects of Tio2 Nanoparticles on Rice (Oryza Sativa L. Cv. Yongyou) Leaf Transcriptome and Soil Bacteria

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SSRN 2022年

作者： Ma, Wenqian Du, Wenchao Gu, Kaihua Xu, Meiling Yin, Ying Sun, Yuanyuan Wu, Jichun Zhu, Jianguo Guo, Hongyan State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China School of Environment Nanjing Normal University Nanjing210023 China State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Surficial Geochemistry School of Earth Sciences and Engineering Nanjing University Nanjing210023 China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Science Nanjing210008 China

Elevated CO 2 affects the plant rhizosphere and can therefore affect the fate and toxicity of soil contaminants. However, little is known about how elevated CO 2 affects the responses of plants and their associated soil bacteria to nanoparticles. A free-air CO 2 enrichment system with two CO 2 levels (ambient, 370 μ mol/mol;elevated, 570 μ mol/mol) was used to investigate the responses of rice ( Oryza Sativa L. cv. Yongyou) and soil bacteria to titanium dioxide nanoparticles (nano-TiO 2 , 0 and 200 mg kg −1 ). Results showed that nano-TiO 2 alone did not significantly affect rice growth but affected soil bacteria involved in the carbon and sulfur cycles. Elevated CO 2 alone increased rice plant biomass and up-regulated genes related to ribosomes, but its combination with nano-TiO 2 down-regulated genes related to photosynthesis and photosynthetic antennae. Elevated CO 2 also exacerbated the disturbance by nano-TiO 2 to soil bacteria involved in carbon and nitrogen cycles. The rice cultivars were shown a decisive factor affecting rice response to elevated CO 2 and nano-TiO 2 . These findings provide a reference for screening high-quality varieties to better adapt to climate change and soil pollution. © 2022, The Authors. All rights reserved.

关键词： TiO2 nanoparticles

Two-phase system model to predict hydrophobic organic compound partition to heterogeneous soil dissolved organic matter across China

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Chemosphere 2024年 362卷 142598页

作者： Liu, Kun Ding, Liang Zhou, Xinwei Qu, Xiaolei Qu, Changsheng Key Laboratory of Environmental Remediation and Ecological Health Ministry of Industry and Information Technology Jiangsu Environmental Engineering Technology Co. Ltd Jiangsu Nanjing210019 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212100 China

Soil dissolved organic matter (SDOM) is an important part of the DOM pool in terrestrial systems, influencing the transport and fate of many pollutants. In this study, SDOMs from different regions across China were compared by a series of spectroscopic methods, including UV–vis spectroscopy, fluorescence spectroscopy, and Fourier transform infrared (FTIR) spectroscopy, and the hydrophobicity was quantified by partition coefficients of SDOM in the aqueous two-phase system (KATPS). The molecular weight, aromaticity, and hydrophobicity of SDOM from different regions exhibited strong heterogeneity, KATPS combined with UV–vis and fluorescence indices can be readily used for differentiating heterogeneous SDOM, and SDOMs were compositionally and structurally different from DOMs in aquatic systems based on spectral characterization. Importantly, the two-phase system (TPS) model has only been validated by DOMs in freshwater systems, and good organic carbon‒water partition coefficient (KOC) predictive power (RMSE = 0.11) could be provided by the TPS model when applied to heterogeneous SDOM without calibration, showing its broad applicability. Our results demonstrate the applicability of the TPS model for predicting the sorption behavior of terrestrial DOM, broadening the application scope of the TPS model and indicating its potential as a routine model for the risk assessment of hydrophobic organic compounds (HOCs) in organic contaminated sites. © 2024

关键词： Soils