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Effect of adding a smart potassium ion-responsive copolymer into polysulfone support membrane on the performance of thin-film composite nanofiltration membrane

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Frontiers of chemical Science and Engineering 2019年第2期13卷 400-414页

作者： Meibo He Zhuang Liu Tong Li chen chen Baicang Liu john c.crittenden Institute of New Energy and Low-carbon Technology Sichuan UniversityChengdu 610207China college of Architecture and Environment Sichuan UniversityChengdu 610065China School of chemical Engineering Sichuan UniversityChengdu 610065China Research center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Litree Purifying Technology co. LtdHaikou 571126China Brook Byers Institute for Sustainable Systems School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlantaGA 30332USA

Thin-film composite (TFc) nanofiltration (NF) membranes were fabricated via the interfacial polymerization of piperazine (PIP) and 1,3,5-benzenetricart)oiiyl trichloride on polysulfone (PSf) support membranes blended with K^+-responsive poly(N-isopropylacryamideco- acryloylamidobenzo-15-crown-5)(P(NIPAM-co- AAB15c5)). Membranes were characterized by attenuated total reflection Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscope, scanning electron microscope, contact angle, and filtration tests. The results showed that:(1) Under K^+-free conditions, the blended P(NIPAM-co-AAB15c5)/PSf supports had porous and hydrophilic surfaces, thereby producing NF membranes with smooth surfaces and low MgSO4 rejections;(2) With K^+ in the PIP solution, the surface roughness and water permeability of the resultant NF membrane were increased due to the K^+-induced transition of low-content P(NIPAM-co-AAB15c5) from hydrophilic to hydrophobic;(3) After a curing treatment at 95℃, the improved NF membrane achieved an even higher pure water permeability of 10.97 L·m^-2·h^-1 - bar1 under 200 psi. Overall, this study provides a novel method to improve the performance of NF membranes and helps understand the influence of supports on TFc membranes.

关键词： nanofiltration interfacial polymerization support membrane potassium ion-responsive thin-film composite

Winners of the 2024 Young Talent Award

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Frontiers of Environmental Science & Engineering 2024年第12期18卷 203-204页

作者： Jiuhui Qu john c.crittenden 不详

By recognizing and publishing the special contributions and achievements of professionals in environmental science and engineering,Frontiers of Environmental Science&Engineering(FESE)is committed to become a vehicle for innovation,development,and application of solutions for environmental protection and sustainable development,and to serve the environmental research community.

关键词： Win environmental publishing

Insight into the mechanisms of trichloronitromethane formation by vacuum ultraviolet: QSAR model and FTIcR-MS analysis

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Journal of Environmental Sciences 2023年第3期125卷 215-222页

作者： Xiaojun chen Yangtao Wu Weiqiu Zhang Lingjun Bu Shumin Zhu Da Sheng Shiqing Zhou john c.crittenden Key Laboratory of Building Safety and Energy Efficiency Ministry of EducationDepartment of Water Engineering and ScienceCollege of Civil EngineeringHunan UniversityChangsha 410082China School of civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems Georgia Institute of TechnologyGeorgia 30332USA

Vacuum ultraviolet(VUV) photolysis is recognized as an environmental-friendly treatment process. Nitrate(NO-3) and natural organic matter(NOM) are widely present in water *** investigated trichloronitromethane(TcNM) formation during chlorination after VUV photolysis, because TcNM is an unregulated highly toxic disinfection byproduct. In this study:(1) we found reactive nitrogen species that is generated under VUV photolysis of NO-3react with organic matter to form nitrogen-containing compounds and subsequently form TcNM during chlorination;(2) we found the mere presence of 0.1 mmol/L NO-3can result in the formation of up to 63.96 μg/L TcNM;(3) we found the changes in pH(6.0-8.0), chloride(1-4 mmol/L), and bicarbonate(1-4 mmol/L) cannot effectively diminish TcNM formation;and,(4) we established the quantitative structure-activity relationship(QSAR) model,which indicated a linear relationship between TcNM formation and the Hammett constant(σ) of model compounds;and,(5) we characterized TcNM precursors in water matrix after VUV photolysis and found 1161 much more nitrogen-containing compounds with higher aromaticity were generated. Overall, this study indicates more attention should be paid to reducing the formation risk of TcNM when applying VUV photolysis process at scale.

关键词： Vacuum ultraviolet Natural organic matter Hammett constant FTIcR-MS Trichloronitromethane

Distribution and source of microplastics in china's second largest reservoir-Danjiangkou Reservoir

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Journal of Environmental Sciences 2021年第4期33卷 74-84页

作者： Li Lin Xiong Pan Sheng Zhang Danwen Li Wenliang Zhai Zhen Wang Jingxiang Tao changqing Mi Qingyun Li john c.crittenden Basin Water Environmental Research Department Changjiang River Scientific Research InstituteWuhanHubei 430010China Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province WuhanHubei 430010China School of Environmental Science and Technology Huazhong University of Science and TechnologyWuhanHubei 430074China Brook Byers Institute of Sustainable Systems School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlantaGA 30332USA

Fresh water microplastic pollution is of pressing concern globally,but its distribution and sources in reservoirs are poorly *** Reservoir is the second largest reservoir in china and is divided into the Han Reservoir and Dan *** this work,microplastic abundances and morphological characteristics of the reservoir were *** microplastic abundance of 15 main tributaries of the reservoir was also *** vertical distribution(in water column and sediment),horizontal distribution(in Han Reservoir and Dan Reservoir)and source of microplastics were *** accumulated in the middle layer of the reservoir,and the size and color of the microplastic particles changed from the surface to the bottom,which implies that surveys of surface water are not enough to determine the microplastic contamination for deep water *** the surface water,the microplastic abundance in the Han Reservoir was lower than that in the Dan Reservoir(pcroplastic abundance did not differ significantly in the intermediate and bottom *** were one of the main sources of microplastics for Han Reservoir but not for Dan *** cultivation in the hydro-fluctuation belt might be an important source of microplastics in the Dan Reservoir,which should be given additional *** results of this study can provide valuable information for developing microplastic sampling strategies in deep water *** studies are recommended to investigate the process through which microplastics in the hydro-fluctuation belt enter the reservoir and the sinking behavior of microplastics in the reservoir.

关键词： Microplastic Vertical distribution Source Hydro-fluctuation belt Danjiangkou Reservoir

Precise regulation of acid pretreatment for red mud ScR catalyst:Targeting on optimizing the acidity and reducibility

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Frontiers of Environmental Science & Engineering 2022年第7期16卷 61-71页

作者： Xiang Zhang Yue Xuan Bin Wang chuan Gao Shengli Niu Gaiju Zhao Dong Wang Junhua Li chunmei Lu john c.crittenden National Engineering Laboratory for coal-Burning Pollutants Emission Reduction School of Energy and Power EngineeringShandong UniversityJinan250061China School of civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems Georgia Institute of TechnologyAtlantaGA30332USA State Key Joint Laboratory of Environment Simulation and Pollution control National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and EquipmentSchool of EnvironmentTsinghua UniversityBeijing100084China Energy Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan250013China

Red mud(RM),as an alkaline waste,was recently proved to be a promising substitute for the ScR *** could improve the acidity and reducibility of red mud,which were critical for ScR ***,the dealkalization effect depended on the reaction between acid solution and red *** this study,we realized the directional control of the chemical state of active sites through tuning the acid pretreatment(dealkalization)*** pretreatment endpoint was controlled at pH values of 3–5 with diluted nitric *** the pH values of red mud were 3 and 5(cRM-3 and cRM-5),activated catalysts showed NOx conversion above 90%at 275℃–475℃.The high initial reaction rate,ce^(3+)/(ce^(3+)+ce^(4+))ratio,and surface acidity accounted for the excellent ScR performance of cRM-5 ***,more Fe^(3+) on the cRM-3 surface improved the NH_(3) *** was a strong interaction between Al and Fe in both cRM-5 and cRM-3 *** results showed that the adsorption capacity of the Al-O_(3)-Fe for NH_(3) and NO is stronger than that of Fe-O_(3)-Fe,which enhanced the NOx conversion of the ***,the almandine was formed in cRM-4,consumed part of Fe^(3+) and Al^(3+),and the interaction between Al and Fe was ***,deposited almandine on the catalyst surface covered the active sites,thus leading to lower NH_(3)-ScR activity.

关键词： Air pollution control Nitrogen oxides Selective catalytic reduction Red mud Solid waste utilization

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New Year’s Message for 2023

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Frontiers of Environmental Science & Engineering 2023年第1期17卷 138-138页

作者： Jiuhui Qu john c.crittenden 不详

As we reflect to the year of 2022,it is worth highlighting that Frontiers of Environmental Science&Engineering(FESE)at the first time reached the landmark of thousand ***,we published 162 papers,which is a 15%***,FESE has successfully become a monthly *** are grateful for the trust and support from authors,reviewers,editorial board members,sponsors,and publishers to witness the growth of FESE.

关键词： grateful journal s.

New Year’s Message for 2022

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Frontiers of Environmental Science & Engineering 2022年第1期16卷 1-1页

作者： Jiuhui Qu john c.crittenden Editors-in-chief

2022 marks the 15^(th)anniversary of the journal of Frontiers of Environmental Science&Engineering(FESE).To date,FESE has received more than 5500 submissions from more than 80 countries and our acceptance rate is~20%.FESE has also been providing a communication and development platform by increasing its editorial board,organizing conferences,and setting up *** are grateful for the support from authors,reviewers,readers,and editorial colleagues to jointly make FESE an internationally recognized journal in the Environmental Science and Engineering field.

关键词： field. journal jointly

沉淀煅烧法合成(cuAg)0.15In0.3Zn1.4S2光催化剂及可见光下的制氢性能

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催化学报 2013年第10期34卷 1926-1935页

作者：张广山张文 john c.crittenden 陈勇生 Daisuke Minakata 王鹏哈尔滨工业大学市政环境工程学院城市水资源与水环境国家重点实验室黑龙江哈尔滨150090 佐治亚理工学院土木与环境工程学院美国亚特兰大30332 新泽西理工学院土木与环境工程系美国纽瓦克07102 佐治亚理工学院布鲁克贝尔可持续性发展学院美国亚特兰大30332 密歇根理工大学土木与环境工程系美国霍顿49931

研究了沉淀煅烧法制备的纳米级(cuAg)0.15In0.3Zn1.4S2光催化剂以及产氢效率,并采用X射线衍射、透射电镜、扫描电镜、N2吸附-脱附、紫外-可见吸收光谱等手段对催化剂进行了表征.结果表明,(cuAg)0.15In0.3Zn1.4S2的结晶度、比表面积和吸... 详细信息

研究了沉淀煅烧法制备的纳米级(cuAg)0.15In0.3Zn1.4S2光催化剂以及产氢效率,并采用X射线衍射、透射电镜、扫描电镜、N2吸附-脱附、紫外-可见吸收光谱等手段对催化剂进行了表征.结果表明,(cuAg)0.15In0.3Zn1.4S2的结晶度、比表面积和吸收可见光能力与煅烧温度和煅烧时间有关.在可见光下,以KI为电子给体,考察了不同条件对光催化产氢能力的影响.发现在600℃煅烧5 h时所制的(cuAg)0.15In0.3Zn1.4S2光催化剂产氢活性最高,产氢速率为1750μmol g-1h-1,量子效率在420±5 nm达到12.8%,比未煅烧催化剂的光催化活性提高了约6倍.

关键词：光催化剂多金属复合硫化物制氢煅烧光催化活性可见光

A guide to shortening the time from submission to publication in Frontiers of Environmental Science & Engineering

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Frontiers of Environmental Science & Engineering 2020年第2期14卷 5-7页

作者： Jiao Zhang Xia Huang Jiming Hao john ccrittenden School of Environment Tsinghua UniversityBeijing 100084China Brook Byers Institute for Sustainable Systems Georgia Institute of TechnologyAtlantaGA 30332USA

Authors want to publish their work as soon as ***,the manuscript processing time increases if the manuscript does not meet the journal *** analysis of manuscripts submitted to Frontiers o f Environmental Science&Engineering from November 2018 to July 2019 shows that the processing time was increased up to 33 days because the manuscripts:(1)had inconsistent formatting of citations,references,and units,(2)exceeded the word limit,(3)were missing information such as the graphical abstract,(4)plagiarized other papers,and(5)had too many tables and ***,we explain how authors can avoid these issues and decrease the manuscript processing time.

关键词： Manuscript Technical evaluation Technical review Return Time Reason Journal