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Synthesis of carbon-coated magnetic nanocomposite(Fe_3O_4@C) and its application for sulfonamide antibiotics removal from water

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Journal of environmental Sciences 2014年第5期26卷 962-969页

作者： Xiaolei Bao Zhimin Qiang Jih-Hsing Chang Weiwei Ben Jiuhui Qu state Key Laboratory of environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences state environmental protection engineering center for pharmacy wastewater pollution control Hebei Provincial Environmental Scientific Research Department of environmental engineering and Management Chaoyang University of Technology

The occurrence of antibiotics in the environment has recently raised serious concerns regarding their potential threat to human health and aquatic ecosystem. A new magnetic nanocomposite, Fe304@C （Fe304 coated with carbon）, was synthesized, characterized, and then applied to remove five commonly-used sulfonamides （SAs） from water. Due to its combinational merits of the outer functionalized carbon shell and the inner magnetite core, Fe3O4@C exhibited a high adsorption affinity for selected SAs and a fast magnetic separability. The adsorption kinetics of SAs on Fe304 @ C could be expressed by the pseudo second-order model. The adsorption isotherms were fitted well with the Dual-mode model, revealing that the adsorption process consisted of an initial partitioning stage and a subsequent hole-filling stage. Solution pH exerted a strong impact on the adsorption process with the maximum removal efficiencies （74% to 96%） obtained at pH 4.8 for all selected SAs. Electrostatic force and hydrogen bonding were two major driving forces for adsorption, and electron-donor-acceptor interactions may also make a certain contribution. Because the synthesized Fe304@C showed comprehensive advantages of high adsorptivity, fast magnetic separability, and prominent reusability, it has potential applications in water treatment.

关键词： magnetic nanocomposite carbon shell sulfonamides adsorption water

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Pretreatment of cyanided tailings by catalytic ozonation with Mn^(2+)/O^3

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Journal of environmental Sciences 2015年第2期27卷 14-21页

作者： Yulong Li Dengxin Li Jiebing Li Jin wang Asif Hussain Hao Ji Yijie Zhai College of environmental Science and engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University

The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2＋dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be： ore pulp density 2.5%, agitation speed 700 r/min,temperature 60°C, Mn2＋dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2＋/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part.

关键词： Cyanided tailings Pretreatment Mn2+/O3 Catalytic ozonation

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Nitrate removal to its fate in wetland mesocosm filled with sponge iron:Impact of influent COD/N ratio

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Frontiers of environmental Science & engineering 2020年第1期14卷 77-85页

作者： Zhihao Si Xinshan Song Xin Cao Yuhui Wang Yifei Wang Yufeng Zhao Xiaoyan Ge Awet Arefe Tesfahunegn College of environmental Science and engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile IndustryDonghua UniversityShanghai 201620China

Sponge iron(s-Fe°)is a porous metal with the potential to be an electron donor for *** study aims to evaluate the feasibility of using s-Fe as the substrate of wetland ***,wetland mesocosms with the addition of s-Fe"particles(CW-Fc)and a blank control group(CW-CK)were *** NOj-N reduction property and water quality parameters(*** ORP)were examined at three COD/N ratios(*** 10).Results showed that the NO3--N removal efficiencies were significantly increased by 6.6 to 58.9%in the presence of s-Fe NH4+-N was mainly produced by chemical denitrification,and approximately 50% of the NO3--N was reduced to N4+-N,at the COD ratio of *** increase of the influent COD/N ratio resulted in lower chemical denitrification and higher *** chemical denitrification mediated by s-Fe led to an accumulation of NH4+-N at COD/N ratios of 0 and *** TIN removal efficiencies increased by 4.5#12.4#.Moreover,the effluent pll,*** ORP values showed a significant negative correlation with total Fe and Fe(II)(P<0.01).High-throughput sequencing analysis indicated that Trichococctis(77.2%)was the most abundant microorganism in the CW-Fc mcsocosm,while Thauera,*** Herbaspirillum were the primary denitrifying *** denitrifiers,Simplicispira,IXxhloronwnas,and *** the dominant bacteria for *** study provides a valuable method and an improved understanding of NOj-N reduction characteristics of s-Fc in a wetland mcsocosm.

关键词： Sponge iron Wetland mesocosm Electronic donor Denitrification COD/N ratio

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Trickling filter in a biocathode microbial fuel cell for efficient wastewater treatment and energy production

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Science China(Technological Sciences) 2019年第10期62卷 1703-1709页

作者： CAO Xin LIANG Peng SONG XinShan WANG YuHui Qiu Yong HUANG Xia state environmental protection engineering center for pollution Treatment and control in Textile Industry College of Environmental Scienceand EngineeringDonghua UniversityShanghai201620China state Key Joint Laboratory of environmental Simulation and pollution control School of EnvironmentTsinghua UniversityBeijing100084China

Aiming to reduce the energy input, oxygen supply by trickling filter was employed in a biocathode microbial fuel cell(MFC) to examine its performance of electricity production and sewage treatment. During batch operation, trickling MFC(TMFC) could start and aerate effectively(DO>3.60 mg/L). During continuous operation, TMFC produced a maximum current density of 71.8 A/m^3 and maximum power density of 26.2 W/m^3 under the hydraulic retention time(HRT) of 10 h. By increasing the HRT to 15 h, 90.6% of COD and 99.0% of ammonia in simulated domestic sewage were efficiently removed and the maximum power density was 19.4 W/m^3. Continuous purification of real municipal wastewater achieved 85.9% of COD removal rate and 91.6%of ammonia removal rate. Sequencing result of biocathodic microorganisms indicated that it consisted of four major classes and the dominant class was γ-proteobacteria, which accounted for up to 84.38%. The dominant genus was Acinetobacter, which accounted for 57.81%. The phylogenetic tree showed different relationships among the 19 species of biocathode microorganisms and the predominant species was Acinetobacter calcoaceticus.

关键词： microbial fuel cell biocathode trickling filter electricity generation sewage purification

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Efficiency and Size Optimization of a General Solid Oxide Fuel Cell System

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Journal of Donghua University(English Edition) 2015年第1期32卷 113-118页

作者：陈鹏黄跃武刘思煦 College of environmental Science and engineering Donghua University state environmental protection engineering center for pollution Treatment and control in Textile Industry Donghua University

An irreversible model of high temperature solid oxide fuel cells( SOFCs) working at steady-state is developed,devoted to performing the optimization with regard to two objectives:minimization of the fuel cell size and maximization of the system efficiency. The performance characteristics of the system are analyzed in details, illustrated by the curves of power density,efficiency and voltage. Genetic algorithm is used to perform the multi-objective optimization with four decision variables: the operating pressure, the fuel stoichiometric ratio, the air stoichiometric ratio and the current density. A Pareto set giving a quantative description of the trade-off between the two objectives is used to analyze the results. Optimization results prove the existence of optimal designs region for a 50 kW system with efficiency from 43% corresponding to a 14. 6 m2 electrolyte area to 48% corresponding to a 25.4 m2 electrolyte area. The SOFC model used is general and the optimization results could be applied to the practical SOFC design.

关键词： solid oxide fuel cell(SOFC) multi-objective optimization efficiency size

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A novel composite(FMC)to serve as a durable 3D-clam-shaped bifunctional cathode catalyst for both primary and rechargeable zinc-air batteries

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Science Bulletin 2017年第17期62卷 1216-1226页

作者： Nengneng Xu Xuemei Li Haoran Li Yanan Wei Jinli Qiao state Key Laboratory for Modification of Chemical Fibers and Polymer Materials State Environmental Protection Engineering Center for Pollution Treatment and Control inTextile IndustryCollege of Environmental Science and EngineeringDonghua UniversityShanghai 201620China

Novel and highly durable air cathode electrocatalyst with three dimensional （3D）-clam-shaped structure, MnO2 nanotubes-supported Fe2O3 （Fe2O3/MnO2） composited by carbon nanotubes （CNTs）（（Fe2O3/ MnO2）3/4-（CNTs）1/4） is synthesized using a facile hydrothermal process and a following direct heat- treatment in the air. The morphology and composition of this catalyst are analyzed using scanning elec- tronic microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD） and energy dispersive X-ray spectroscopy （EDX）. The morphology characteristics reveal that flower-like Fe2O3 parti- cles are highly dispersed on both MnO2 nanotubes and CNT surfaces, coupling all three components firmly. Electrochemical measurements indicate that the synergy of catalyst exhibit superior bi- functional catalytic activity for both oxygen reduction reaction （ORR） and oxygen evolution reaction （OER） as well as stability than Pt/C and lrO2 catalysts. Using these catalysts for air-cathodes, both primary and rechargeable zinc-air batteries （ZABs） are assembled for performance validation. In a primary ZAB, this 3D-clamed catalyst shows a decent open circuit voltage （OCV, -1.48 V） and a high discharge peak power density （349 mW cm 2）, corresponding to a coulomhic efficiency of 92%. In a rechargeahle ZABs with this bifunctional catalyst, high OCV （〉1.3 V） and small charge-discharge voltage gap （〈1.1 V） are achieved along with high specific capacity （780 mAh g 1 at 30 mA cm-2） and robust cycle-life （1,390 cycles at cycle profile of 20 mA/10 min）.

关键词： Bifunctional composite catalysts ORR and OER Rechargeable ZABs Specific capacity Long durability

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Insight into the critical factors determining the particle number concentrations during summer at a megacity in China

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Journal of environmental Sciences 2019年第1期31卷 169-180页

作者： Baoshuang Liu Xiaohui Bi Jiaying Zhang Jie Yuan Zhimei Xiao Qili Dai Yinchang Feng Yufen Zhang state environmental protection Key Laboratory of Urban Ambient Air Particulate Matter pollution Prevention and control & center for Urban Transport Emission Research College of Environmental Science and EngineeringNankai University Tianjin environmental Monitoring center

To identify the critical factors impacting the number concentration of particles with the aerodynamic diameters less than 2.5 μm(PNC_(2.5)), the continuous measurement of PNC_(2.5),chemical components in PM_(2.5), gaseous pollutants and meteorological conditions were conducted at an urban site in Tianjin in June 2015. Results indicated that the average PNC_(2.5) was 2839 ± 2430 d N/dlog Dp 1/cm^3 during the campaign. Compared to other meteorological parameters, the relative humidity(RH) had the strongest relationship with PNC_(2.5), with a Pearson's correlation coefficient of 0.53, and RH larger than 30% influenced strongly PNC_(2.5).The important influence of secondary reactions on PNC_(2.5) was inferred due to higher correlation coefficients between PNC_(2.5) and SO_4^(2-), NO_3^-, NH_4^+(r = 0.78–0.89; p < 0.01) and between PNC_(2.5) and ratios that represent the conversion of nitrogen and sulfur oxides to particulate matter(r = 0.42–0.49; p < 0.01). Under specific RH conditions, there were even stronger correlations between PNC_(2.5) and NO_3^-, SO_4^(2-), NH_4^+, while those between PNC_(2.5) and EC, OC were relatively weak, especially when RH exceeded 50%. Principal component analysis(PCA) and Pearson's correlation analysis indicated that secondary sources, vehicle emission and coal combustion might be major contributors to PNC_(2.5). Backward trajectory and potential source contribution function(PSCF) analysis suggested that the transport of air masses originated from these regions around Tianjin(Liaoning, Hebei, Shandong and Jiangsu) influenced critically PNC_(2.5). The north of Jiangsu, the west of Shandong, and the east of Hebei were distinguished as major potential source-areas of PNC_(2.5) by PSCF model.

关键词： Particle number concentration Correlation analysis Emission sources PSCF

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Efficient degradation of tetracycline by singlet oxygen-dominated peroxymonosulfate activation with magnetic nitrogen-doped porous carbon

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Journal of environmental Sciences 2022年第5期34卷 330-340页

作者： Shaohua Wu Chunping Yang Yan Lin Jay J.Cheng Guangdong Provincial Key Laboratory of Petrochemcial pollution Processes and control School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaomingGuangdong 525000China College of environmental Science and engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangshaHunan 410082China Maoming engineering Research center for Organic pollution control Academy of Environmental and Resource SciencesGuangdong University of Petrochemical TechnologyMaomingGuangdong 525000China Hunan Provincial environmental protection engineering center for Organic pollution control of Urban Water and wastewater ChangshaHunan 410001China Department of Biological and Agricultural engineering North Carolina State UniversityRaleighNC 27695USA

Nonradical reaction driven by peroxymonosulfate(PMS)based advanced oxidation pro-cesses has drawn widespread attention in water treatment due to their inherent advantages,but the degradation behavior and mechanism of organic pollutants are still *** this study,the performance,intermediates,mechanism and toxicity of tetracycline(TC)degra-dation were thoroughly examined in the constructed magnetic nitrogen-doped porous car-bon/peroxymonosulfate(Co-N/C-PMS)*** results showed that 85.4%of TC could be removed within 15 min when Co-N/C and PMS was simultaneously added and the degra-dation rate was enhanced by 3.4 and 14.7 folds compared with Co-N/C or PMS alone,***,the performance of Co-N/C was superior to that of most previously reported *** lines of evidence indicated that Co-N/C-PMS system was a singlet oxygen-dominated nonradical reaction,which was less interfered by pH and water compo-nents,and displayed high adaptability to actual water ***,the degrada-tion process was elaborated on the basis of three-dimensional excitation-emission matrix spectra and liquid chromatography-mass *** last,the toxicity of treated TC was greatly reduced by using microalgae Coelastrella *** ecological *** study provides a promising approach based on singlet oxygen-dominated nonradical reaction for eliminating TC in water treatment.

关键词： Tetracycline Peroxymonosulfate Activation Singlet oxygen Toxicity

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Technical Perspective of Carbon Capture,Utilization,and Storage

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engineering 2022年第7期8卷 27-32页

作者： Qingyang Lin Xiao Zhang Tao Wang Chenghang Zheng Xiang Gao state Key Laboratory of Clean Energy Utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China

Carbon dioxide(CO_(2))is the primary greenhouse gas contributing to anthropogenic climate change which is associated with human *** majority of CO_(2) emissions are results of the burning of fossil fuels for energy,as well as industrial processes such as steel and cement *** capture,utilization,and storage(CCUS)is a sustainable technology promising in terms of reducing CO_(2) emissions that would otherwise contribute to climate *** this perspective,the discussion on carbon capture focuses on chemical absorption technology,primarily due to its commercialization *** CO_(2) absorptive capacity and absorption rate of various chemical solvents have been *** carbon utilization focuses on electrochemical conversion routes converting CO_(2) into potentially valuable chemicals which have received particular attention in recent *** Faradaic conversion efficiencies for various CO_(2) reduction products are used to describe efficiency *** carbon storage,successful deployment relies on a better understanding of fluid mechanics,geomechanics,and reactive transport,which are discussed in details.

关键词： CCUS Carbon capture Carbon utilization Carbon storage Chemical absorption Electrochemical conversion Storage mechanism

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Denitrification and microbial community in MBBR using A. donax as carbon source and biofilm carriers for reverse osmosis concentrate treatment

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Journal of environmental Sciences 2019年第10期31卷 133-143页

作者： Li Li Guokai Yan Haiyan Wang Zhaosheng Chu Zewen Li Yu Ling Tong Wu state Key Laboratory of environmental Criteria And Risk As sessment Chinese Research Academy of Environmental SciencesBeijing 100012China engineering center for environmental pollution control Chinese Research Academy of Environmental SciencesBeijing 100012China National engineering Laboratory for Lake pollution control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China state environmental protection Key Laboratory for Lake pollution control Chinese Research Academy of Environmental SciencesBeijing 100012China

In this study,raw Arundo donax(***)pieces were applied as carbon source and biofilm carriers for denitrification in a lab-scale moving bed biofilm reactor(MBBR)for the treatment of reverse osmosis concentrate gathered from local wastewater reuse *** stable phase(about 60 days),efficient denitrification performance was obtained with73.2%±19.5%NO3--N average removal and 8.10±3.45 g N/(m3·day)NO3--N average volumetric removal *** balance analysis showed that 4.84 g *** was required to remove 1 g *** real-time PCR analysis results showed that the copy numbers of 16S r-RNA,narG,nirS,nosZ and anammox gene of carrier biofilm and suspended activated sludge in the declination phase(BF2 and AS2)were lower than those of samples in the stable phase(BF1 and AS1),and relatively higher copy numbers of nirS and nirK genes with lower abundance of narG and nosZ genes were ***-throughput sequencing analysis was conducted for BF2 and AS2,and similar dominant phyla and classes with different abundance were *** class Gammaproteobacteria affiliated with the phylum Proteobacteria was the most dominant microbial community in both BF2(52.6%)and AS2(41.7%).The PICRUSt prediction results indicated that 33 predictive specific genes were related to denitrification process,and the relative abundance of 18 predictive specific genes in BF2 were higher than those in AS2.

关键词： Arundo donax carbon source Denitrification MBBR Reverse osmosis concentrate Nitrate removal Microbial community High-throughput sequencing

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