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Effect of iron ion configurations on Ni^(2+) removal in electrocoagulation

Journal of Environmental Sciences 2023年第2期124卷 823-834页

作者： Xiaoliu Lü Tao Xu Yihui Zhou Qingjuan Peng Jinhua Ou Bonian Hu Zhihui Xie Xiping Lei Gang Yu College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China Research Institute of New Building Materials Hunan Institute of TechnologyHengyang 421008China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Hunan Zihong Ecology Technology Co. Ltd.Changsha 410000China

Electrocoagulation(EC)has been widely used to treat the heavymetal wastewater in industry.A novel process of sinusoidal alternating current electrocoagulation(SACC)is adopted to remove Ni2+in wastewater in this *** morphology of precipitates and the distribution of the main functional iron configurations were *** timed complex spectroscopy can identify the monomeric iron configurations[Fe(a)],oligomeric iron configurations[Fe(b)]and polymeric iron configurations[Fe(c)].The optimal operating conditions of SACC process were determined through single-factor *** maximum Ni2+removal efficiency[Re(Ni^(2+))]was achieved under the conditions of pH0=7,current density(j)=7 A/m^(2),electrolysis time(t)=25 min,c0(Ni^(2+))=100 mg/*** pH=7,the proportion of Fe(b)and Fe(c)in the system was 50.4 at.% and 23.1 at.%,*** the SACC process,Fe(b)and Fe(c)are themain iron configurations in solution,while Fe(c)are the vastmajority of the iron configurations in the direct current electrocoagulation(DCC)***(Ni2+)is 99.56% for SACC and 98.75% for DCC under the same optimum conditions,*** precipitates produced by SACC have a high proportion of Fe(b)configurations with sphericalα-FeOOH andγ-FeOOH structures which contain abundant hydroxyl ***,it is demonstrated that Fe(b)has better adsorption capacity than Fe(c)through adsorption experiments of methyl orange(MO)***(a)configurations in the homogeneous solution had no effect on the removal of nickel.

关键词： Electrocoagulation Nickel wastewater Iron configurations Alternating current Polynuclear iron-hydroxyl complex

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Nitrogen-enriched micro-mesoporous carbon derived from polymers organic frameworks for high-performance capacitive deionization

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Journal of Environmental Sciences 2022年第1期34卷 282-291页

作者： Jianpei Zhang Xun-an Ning Danping Li Yi Wang Xiaojun Lai Weixuan Ou Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environment Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China School of Land Resources and Environment Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi ProvinceJiangxi Agricultural UniversityNanchang 330045China

Nitrogenization is an effective method for improving the capacitive deionization(CDI)performance of porous carbon *** particular,polymer organic frameworks with heteroatom doping,containing an ordered pore structure and excellent electrochemical stability,are ideal precursors for carbon materials for high-performance *** this study,a nitrogen-enriched micro-mesoporous carbon(NMC)electrode was fabricated by carbonizing a Schiff base network-1 at 500,600,and 700℃.Scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray diffraction,N_(2) adsorption-desorption,the contact angle of water,cyclic voltammetry,and electrochemical impedance spectroscopy were used to characterize the morphological structure,wettability,Brunauer–Emmett–Teller surface areas,and electrochemical performance of the *** results showed that the NMC carbonized at 600℃ achieved the best specific capacitance(152.33 F/g),as well as a high electrosorption capacity(25.53 mg/g)because of its chemical composition(15.57%N)and surface area(312 m^(2)/g).These findings prove that NMC is viable as an electrode material for desalination by high-performance CDI applications.

关键词： Polymers organic frameworks Nitrogen-doped carbon Micro-mesoporous Carbon Capacitive deionization

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Investigation into enhanced performance of toluene and Hg^(0) stimulative abatement over Cr-Mn oxides co-modified columnar activated coke

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Journal of Environmental Sciences 2025年第2期148卷 88-106页

作者： Jiajie Wang Jie Liu Lei Gao Dong Xie Caiting Li Liping Xiang Huiyu Xiong Jiaqi Xie Tianren Zhang Yueguo Pan School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China National&Local Joint Engineering Research Center for Airborne Pollutants Control and Radioactivity Protection in Buildings Hengyang 421001China Key Laboratory of Prefabricated Building Energy Saving Technology of Hunan Province Hengyang 421001China College of Environmental Science and Engineering Hunan UniversityChangsha 410082China

In this study,a string of Cr-Mnco-modified activated coke catalysts(XCryMn1-y/AC)were prepared to investigate toluene and Hg^(0) removal *** characterizations including XRD,TEM,SEM,in situ DRIFTS,BET,XPS and H_(2)-TPR showed that 4%Cr0.5Mn0.5/AC had excellent physicochemical properties and exhibited the best toluene and Hg^(0) removal efficiency at 200℃.By varying the experimental gas components and conditions,it was found that too large weight hourly space velocity would reduce the removal efficiency of toluene and Hg^(0).Although O_(2) promoted the abatement of toluene and Hg^(0),the inhibitory role of H_(2)O and SO_(2) offset the promoting effect of O_(2) to some *** significantly inhibited Hg^(0) removal,resulting from that toluene was present at concentrations orders of magnitude greater than mercury’s or the catalyst was more prone to adsorb toluene,while Hg^(0) almost exerted non-existent influence on toluene *** mechanistic analysis showed that the forms of toluene and Hg^(0) removal included both adsorption and oxidation,where the high-valent metal cations and oxygen vacancy clusters promoted the redox cycle of Cr^(3+)+Mn^(3+)/Mn^(4+)+Cr^(6+)+Mn^(2+),which facilitated the conversion and replenishment of reactive oxygen species in the oxidation process,and even the CrMn_(1.5)O_(4) spinel structure could provide a larger catalytic interface,thus enhancing the adsorption/oxidation of toluene and Hg^(0).Therefore,its excellent physicochemical properties make it a costeffective potential industrial catalyst with outstanding synergistic toluene and Hg^(0) removal performance and preeminent resistance to H_(2)O and SO_(2).

关键词： Toluene Element mercury Cr-Mn oxides Activated coke

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Coupled biodegradation of p-nitrophenol and p-aminophenol in bioelectrochemical system:Mechanism and microbial functional diversity

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Journal of Environmental Sciences 2021年第10期33卷 134-144页

作者： Jianjun Luo Yuxi Xu Jing Wang Libin Zhang Xinbai Jiang Jinyou Shen Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

Biodegradation mechanisms and microbial functional diversity during coupled pnitrophenol(PNP)and p-aminophenol(PAP)degradation were studied in a bioelectrochemical *** in the biocathode and PAP in the bioanode were almost completely removed within 28 hr and 68 hr *** degradation followed the steps including hydrating hydroxyalkylation,dehydrogenating carbonylation,and hydrolating ring cleavage,*** analysis based on the KEGG and egg NOG database annotations revealed the microbial composition and functional genes/enzymes related to phenol degradation in the *** predominant bacteria genera were Lautropia,Pandoraea,Thiobacillus,Ignavibacterium,Truepera and *** recognized biodegradation genes/enzymes related to pollutant degradation were as follows:pmo,hbd,&ppo for phenol degradation,nzba,amie,&badh for aromatic degradation,and CYP&p450 for xenobiotics degradation,*** co-occurrence of ARGs(antibiotic resistant genes),such as ade F,Mex J,Erm F,PDC-93 and Escherichiacolimdf A,etc.,were annotated in CARD database during the biodegradation *** Proteobacteria&Actinobacteria phylum was the primary host of both the biodegradation genes&ARGs in this *** microbial functional diversity ensured the effective biodegradation of the phenol pollutants in the bioelectrochemical system.

关键词： Phenols biodegradation Functional diversity Functional gene Metagenome

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Dynamic Active Sites in Bi_(5)O_(7)I Promoted by Surface Tensile Strain Enable Selective Visible Light CO_(2)Photoreduction

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Research 2023年第1期2022卷 301-311页

作者： Xian Shi Xing'an Dong Yanjuan Sun Shihan Zhang Fan Dong Research Center for Environmental and Energy Catalysis Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province College of EnvironmentZhejiang University of TechnologyHangzhou 310014China

Surface defects with abundant localized electrons on bismuth oxyhalide catalysts are proved to have the capability to capture and activate CO_(2).However,bismuth oxyhalide materials are susceptible to photocorrosion,making the surface defects easily deactivated and therefore losing their function as active *** of deactivation-resistant surface defects on catalyst is essential for stable CO_(2)photoreduction,but is a universal *** this work,the Bi_(5)O_(7)I nanotubes with surface tensile strain are synthesized,which are favorable for the visible light-induced dynamic I defects *** CO_(2)molecules absorbed on I defects are constantly reduced by the incoming photogenerated electrons from I-deficient Bi_(5)O_(7)I nanotubes and the successive protonation of CO_(2)molecules is thus highly promoted,realizing the selective CO_(2)conversion process via the route of CO_(2)-COOH^(-)-*** efficient and stable photoreduction of CO_(2)into CO with 100%selectivity can be achieved even under visible light(>420 nm)irradiation benefited from the dynamic I defects as active *** results presented herein demonstrate the unique action mechanism of light-induced dynamic defects during CO_(2)photoreduction process and provide a new strategy into rational design of deactivation-resistant catalysts for selective CO_(2)photoreduction.

关键词： visible bismuth rational

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Mechanistic investigation on Ag-Cu_(2)O in electrocatalytic CO_(2) to CH_(4) by in situ/operando spectroscopic and theoretical analysis

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Journal of Energy Chemistry 2024年第1期88卷 521-531,I0012页

作者： Min Sun Luxiao Zhang Fuli Tian Jiaxin Li Yanqiu Lei Heng Zhang Lifeng Han Zhihua Guo Yonghui Gao Fenrong Liu Yan Wang Luhui Wang Shanghong Zeng School of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021Inner MongoliaChina Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province Hainan Vocational University of Science and TechnologyHaikou 571126HainanChina State Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030Inner MongoliaChina Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control Zhejiang Ocean UniversityZhoushan 316022ZhejiangChina

Silver-copper electrocatalysts have demonstrated effectively catalytic performance in electroreduction CO_(2) toward CH_(4),yet a revealing insight into the reaction pathway and mechanism has remained ***,we construct chemically bonded Ag-Cu_(2)O boundaries,in which the complete reduction of Cu_(2)O to Cu has been strongly impeded owing to the presence of surface Ag *** interfacial confinement effect helps to maintain Cu^(+)sites at the Ag-Cu_(2)O *** in situ/operando spectroscopy and theoretical simulations,it is revealed that CO_(2) is enriched at the Ag-Cu_(2)O boundaries due to the enhanced physisorption and chemisorption to CO_(2),activating CO_(2) to form the stable intermediate^(*)*** boundaries between Ag shell and the Cu_(2)O mediate local^(*)CO coverage and promote^(*)CHO intermediate formation,consequently facilitating CO_(2)-to-CH_(4) *** work not only reveals the structure-activity relationships but also offers insights into the reaction mechanism on Ag-Cu catalysts for efficient electrocatalytic CO_(2) reduction.

关键词： Ag shell Interfacial confinement effect Cu~+ Local*CO coverage CO_(2)reduction

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Zinc lactate alleviates oxidative stress by modulating crosstalk between constitutive androstane receptor signaling pathway and gut microbiota profile in weaned piglets

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Animal Nutrition 2024年第1期16卷 23-33页

作者： Wenjie Tang Xuan Xiang Houfu Wang Wentao Zhou Liuqin He Yulong Yin Tiejun Li College of Animal Science and Technology Hunan Agricultural UniversityChangsha 410128China Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process CAS Key Laboratory of Agro-Ecological Processes in Subtropical RegionNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation Laboratory of Animal Nutrition and Human HealthCollege of Life SciencesHunan Normal UniversityChangsha 410081China College of Advanced Agricultural Science University of Chinese Academy of SciencesBeijing 100049China Sichuan Academy of Animal Sciences Animal Breeding and Genetics Key Laboratory of Sichuan ProvinceChengdu 610066China Livestock and Poultry Biological Products Key Laboratory of Sichuan Province Sichuan Animtech Feed Co.LtdChengdu 610000China

This study aimed to determine the regulatory mechanism of dietary zinc lactate(ZL)supplementation on intestinal oxidative stress damage in a paraquat(PQ)-induced piglet ***-eight piglets(mean body weight 9.51±0.23 kg)weaned at 28 d of age were randomly divided into control,ZL,PQ,and ZL+PQ groups(n=7 in each group).The ZL-supplemented diet had little effect on growth performance under normal physiological ***,under PQ challenge,ZL supplementation significantly improved average daily gain(P<0.05)and reduced the frequency of *** improved intestinal morphology and ultrastructure by significantly increasing the expression level of the jejunal tight junction protein,zonula occludens-1(ZO-1)(P<0.05),and intestinal zinc transport and absorption in PQ-induced piglets,which reduced intestinal *** supplementation also enhanced the expression of antioxidant and antiinflammatory factor-related genes and decreased inflammatory cytokine expression and secretion in PQinduced ***,ZL treatment significantly inhibited the activation of constitutive androstane receptor(CAR)signaling(P<0.01)in PQ-induced piglets and altered the structure of the gut microbiota,especially by significantly increasing the abundance of beneficial gut microbes,including UCG_002,Ruminococcus,Rikenellaceae_RC9_gut_group,Christensenellaceae_R_7_group,Treponema,unclassified_Christensenellaceae,and unclassified_Erysipelotrichaceae(P<0.05).These data reveal that pre-administration of ZL to piglets can suppress intestinal oxidative stress by improving antioxidant and anti-inflammatory capacity and regulating the crosstalk between CAR signaling and gut microbiota.

关键词： Zinc lactate Intestinal barrier Oxidative stress Inflammation Constitutive androstane receptor Gut microbiota

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Enhanced 4-chlorophenol biodegradation by integrating Fe_(2)O_(3)nanoparticles into an anaerobic reactor:Long-term performance and underlying mechanism

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 107-119页

作者： Cheng Hou Xinbai Jiang Na Li Zhenhua Zhang Qian Zhang Jinyou Shen Xiaodong Liu Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Biosafety Nanjing Institute of Environmental SciencesNanjing 210042China School of Life and Environmental Science Guilin University of Electronic TechnologyGuilin 541004China

Fe_(2)O_(3)nanoparticles have been reported to enhance the dechlorination performance of anaerobic systems,but the underlying mechanism has not been *** study evaluated the technical feasibility,system stability,microbial biodiversity and the underlying mechanism involved in a Fe_(2)O_(3)nanoparticle-coupled anaerobic system treating 4-chlorophenol(4-CP)*** results demonstrated that the 4-CP and total organic carbon(TOC)removal efficiencies in the Fe_(2)O_(3)-coupled up-flow anaerobic sludge blanket(UASB)were always higher than 97%and 90%during long-term operation,verifying the long-term stability of the Fe_(2)O_(3)-coupled *** 4-CP and TOC removal efficiencies in the coupled UASB increased by 42.90.4%and 27.50.7%compared to the control UASB *** Fe_(2)O_(3)nanoparticles promoted the enrichment of species involved in dechlorination,fermentation,electron transfer and acetoclastic methanogenesis,and significantly enhanced the extracellular electron transfer ability,electron transport activity and conductivity of anaerobic sludge,leading to enhanced 4-CP biodegradation performance.A possible synergistic mechanism involved in enhanced anaerobic 4-CP biodegradation by Fe_(2)O_(3)nanoparticles was proposed.

关键词： Dechlorination Fe_(2)O_(3)nanoparticles Electron transfer Microbial community

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Efficiency,mechanism and microbial community of Cd(Ⅱ)removal by mixed bacteria enriched from heavy metals mine soil

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Transactions of Nonferrous Metals Society of China 2022年第10期32卷 3404-3419页

作者： Tao-tao ZENG Xiao-ling ZHANG Hai-du NONG Qing HU Liang-qin WANG Ai-jie WANG Hunan Provincial Key Laboratory of Pollution Control and Resources Reuse Technology University of South ChinaHengyang 421001China Key Laboratory of Environmental Biotechnology Chinese Academy of SciencesBeijing 100085China

Mixed bacteria were enriched from heavy metals mine soil for cadmium(Cd(Ⅱ))-containing wastewater treatment. Batch adsorption experiment results showed that the optimal pH, temperature, initial Cd(Ⅱ) concentration, and biomass dosage were 6.0, 30 ℃, 20 mg/L, and 1 g/L, respectively. Living biomass exhibited better Cd(Ⅱ) removal efficiency(91.97%) than autoclaved biomass(79.54%) under optimal conditions. The isotherms and kinetics of living biomass conformed to the Langmuir isotherm model and pseudo-first-order kinetic model, respectively. FTIR results implied that amine groups, hydroxyl groups and phosphoric acid play an important role in the Cd(Ⅱ) adsorption process, while XRD results showed that crystalline Cd(OH)and CdO were obtained. After Cd(Ⅱ)-containing wastewater treatment exposure, the dominant bacteria genera included Comamonas(39.94%), unclassified_f__Enterobacteriaceae(34.96%), Ochrobactrum(14.07%), Alcaligenes(4.84%), Bordetella(2.07%), Serratia(1.04%), and Bacillus(1.01%). Function prediction showed that the abundance of metabolic genes changed significantly. This study proposes the potential application of mixed bacteria for Cd(Ⅱ)-containing wastewater treatment.

关键词： Cd(Ⅱ) wastewater treatment bacterial community function prediction

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Hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid)hydrogel as stable soil water retention and nutrient release agent for plant growth

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Journal of Bioresources and Bioproducts 2022年第2期7卷 34-45页

作者： Yufei Zhang Xinyue Tian Qiuyue Zhang Huifang Xie Bingyu Wang Yanfang Feng Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Agro-Environment in Downstream of Yangtze Plain Ministry of Agriculture and Rural AffairsInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China

The cellulose-based hydrogel has been widely applied for soil water retention and nutrient re-lease agents for several *** the inorganic materials into hydrogels is an excellent strategy to improve the inherent limits of the cellulose-based ***,municipal sludge-derived hydrochar(HC)has reduced the environmental burden and offered a potential hydrogel carrier to control water-retention and ***,the above function for plant growth of hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid)(CMC-g-PAA/HC)is unknown,and relevant reports are *** study investigated the water retention,nutri-ent release behavior,and effect of germination and plant growth of CMC-g-PAA/HC *** results showed that HC was successfully incorporated into CMC-g-PAA/HC with 6.0%higher thermostability,7.2-21.0%lower swelling ratio(SR)in water,and substantial SR in phosphate solution(P-solution).The water loss rate of CMC-g-PAA/HC in P-solution or wa-ter owned a more significant temperature response(7.9-15.0 folds)than CMC-g-PAA(8.2-10.0 folds).Moreover,4.0%higher n value and more 18.5%released P for CMC-g-PAA/HC were also *** phenomena were due to restricting the polymer chains movement and the wa-ter molecules diffusion inside the hydrogels with *** assessments showed that HC in CMC-g-PAA/HC could effectively alleviate the inhibition effects on rape germination retained with 78.3%germination vigor and 80.0%germination ratio,even dramatically improved plant growth to 28 *** results of this study demonstrated a new route for developing eco-friendly CMC-g-PAA/HC hydrogel,advantageous as a water retention agent and nutrient carrier in arid and semiarid regions.

关键词： Hydrogel Hydrochar Stable phosphorus-release Water retention Plant growth

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