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Journal of Environmental Sciences 2013年第10期25卷 2023-2030页

作者： Xuejun Quan Zhiliang Cheng Bo Chen Xincai Zhu College of Chemistry and Chemical Engineering Chongqing University of Technology

Biologically-treated municipal solid waste （MSW） leachate still contains many kinds of bit-recalcitrant organic matter. A new plate and frame electrochemical reactor was designed to treat these materials under flow conditions. In the electrochemical oxidation process, NH3 and color could be easily removed by means of electro-generated chlorinefaypochlorite within 20 min. The effects of major process parameters on the removal of organic pollutants were investigated systematically. Under experimental conditions, the optimum operation parameters were current density of 65 mA/cm^2, flow velocity of 2.6 cm/sec in electrode gap, and initial chloride ion concentration of 5000 mg/L. The COD in the leachate could be reduced below 100 mg/L after 1 hr of treatment. The kinetics and mechanism of COD removal were investigated by simultaneously monitoring the COD change and chlorine/hypochlorite production. The kinetics of COD removal exhibited a two-stage kinetic model, and the decrease of electro-generated chlorine/hypochlorite production was the major mechanism for the slowing down of the COD removal rate in the second stage. The narrowing of the electrode gap is beneficial for COD removal and energy consumption.

关键词： municipal solid waste leachate refuse incineration electrochemical oxidation electrochemical reactor

electrochemical oxidation of 1H,1H,2H,2H-perfluorooctane sulfonic acid(6:2 FTS) on DSA electrode:Operating parameters and mechanism

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Journal of Environmental Sciences 2014年第8期26卷 1733-1739页

作者： Qiongfang Zhuo Xiang Li Feng Yan Bo Yang Shubo Deng Jun Huang Gang Yu POPs Research Center School of EnvironmentTsinghua University South China Institute of Environmental Sciences the Ministry of Environment Protection College of Chemistry and Chemical Engineering Shenzhen University

The 6：2 FTS was the substitute for perfluorooctane sulfonate（PFOS） in the chrome plating industry in Japan. electrochemical oxidation of 6：2 FTS was investigated in this study. The degradabilities of PFOS and 6：2 FTS were tested on the Ti/SnO2–Sb2O5–Bi2O3anode. The effects of current density,potential,and supporting electrolyte on the degradation of 6：2 FTS were evaluated. Experimental results showed that 6：2 FTS was more easily degraded than PFOS on the Ti/SnO2–Sb2O5–Bi2O3anode. At a low current density of 1.42 mA/cm2,6：2 FTS was not degraded on Ti/SnO2–Sb2O5–Bi2O3,while the degradation ratio increased when the current density ranged from 4.25 to 6.80 mA/cm2. The degradation of 6：2 FTS at current density of 6.80 mA/cm2 followed pseudo first-order kinetics with the rate constant of 0.074 hr-1. The anodic potential played an important role in the degradation of 6：2 FTS,and the pseudo first-order rate constants increased with the potential. The surface of Ti/SnO2–Sb2O5–Bi2O3was contaminated after electrolysis at constant potential of 3 V,while the fouling phenomenon was not observed at 5 V. The fouled anode could be regenerated by incinerating at 600°C. The intermediates detected by ultra-performance liquid chromatography coupled with a triple-stage quadrupole mass spectrometer（UPLC–MS/MS） were shorter chain perfluorocarboxylic acids. The 6：2 FTS was first attacked by hydroxyl radical,and then formed perfluorinated carboxylates,which decarboxylated and removed CF2 units to yield shorter-chain perfluorocarboxylic acids.

关键词： 6:2 FTS electrochemical oxidation Intermediates Mechanism

electrochemical oxidation of perfluoroalkyl and polyfluoroalkyl substances:Mechanisms,implications,and challenges

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Science China(Technological Sciences) 2024年第10期67卷 2972-2990页

作者： ZHOU XuDong ZHONG YaShi TIAN XiaoChun ZHAO Feng CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China College of Environment Safety EngineeringFuzhou UniversityFuzhou 350108China

Perfluoroalkyl and polyfluoroalkyl substances(PFASs)have recently gained considerable attention due to their potential risks to human health and *** response to these concerns has led to regulations and bans on legacy PFASs,such as perfluorooctanoic acid and perfluorooctane sulfonic ***,fluoride production has shifted toward short-chain PFASs and emerging fluorinated *** technologies are available for PFAS degradation,among which electrochemical oxidation(EO)is a promising method to mineralize legacy PFASs and other emerging fluorinated alternatives in water *** review provides an overview of the recent advancements in EO,comprehensively elucidating PFAS degradation mechanisms at the anode and exploring key factors that influence PFAS removal efficiency,such as anode materials as well as reactor designs and ***,the review elucidates the impact of operating conditions and parameters,including current density,electrolytes,pH,initial PFAS concentrations,and other coexisting pollutants,on the EO ***,the constraints in the EO process are discussed when considering practical implementations,including undesired by-product generation,incomplete mineralization resulting in the accumulation of short-chain PFASs,and low PFAS concentrations in the natural environment leading to mass transfer limitations and low defluorination ***,this review provides a perspective on potential solutions integrating the pre-concentration steps and EO process for effective PFAS remediation.

关键词： electrochemical oxidation legacy PFASs fluorinated alternatives degradation mechanisms influencing factors

electrochemical oxidation of L-Cystenine in SDS/BA/H_2O Microemulsion

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Chemical Research in Chinese Universities 2005年第3期21卷 322-325页

作者： LIZhong-chun LIUTian-qing GUORong SchoolofChemistryandChemicalEngineering YangzhouUniversityYangzhou225002P.R.China

The electrochemical oxidation of L-cysteine in an SDS/BA/H_2O microemulsion system was studied with the methods of ultramicroelectrode cyclic voltammetry and AC impedance. The catalytic efficiency of the microemulsion on the electrochemical oxidation increases with the increase of BA or SDS content, but decreases with the increase of the water content because of the effects of BA, SDS and water on the solubilization of L-cysteine in the microemulsion. Furthermore, the catalytic efficiency of the bicontinuous structure is greater than that of an O/W microemulsion system. The results derived from both the rate constant k0 and Gibbs free energy ΔG≠ accord with those from the catalytic efficiency.

关键词： Sodium dodecyl sulfate Microemulsion electrochemical oxidation L-Cysteine

electrochemical oxidation of Chlorimuron-ethyl on Ti/SnO_2-Sb_2O_5/PbO_2 Anode for Waste Water Treatment

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Chemical Research in Chinese Universities 2010年第4期26卷 630-635页

作者： YU Shi-jun XUE Bin WANG Jian-ya SUN Jian SHEN Zhi-qiu School of Chemical Engineering Dalian University of Technology Dalian 116012 P. R. China School of Petrochemical Engineering Shenyang University of Technology Liaoyang 111003 P. R. China

The electrochemical oxidation of chlorimuron-ethyl on metry. The electrochemical behaviour of the electrode in a sodium Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltamsulfate solution and in the mixture solution of sodium sulfate and chlorimuron-ethyl was studied. The experimental results of cyclic voltammetry show that the acidic medium was suitable for the efficient electrochemical oxidation of chlorimuron-ethyl. Some electro-generated reagent was formed in the electrolysis process and chlorimuron-ethyl could be oxidized by the electro-generated reagent. A Ti/SnO2-Sb2O5/PbO2 electrode was used as the anode and the electrolysis experiment was carried out under the optimized conditions. The electrolysis process was monitored by UV-Vis spectrometry and high performance liquid chromatography（HPLC）, and the chemical oxygen demand（COD） was determined by the potassium dichromate method. The mechanism of chlorimuron-ethyl to be oxided was studied primarily by the cyclic voltammetry and UV-Vis spectrometry. The results of electrolysis experiment demonstrate the possibility of the electrode to be used as an anode for the electrochemical treatment of chlorimuron-ethyl contained in waste water.

关键词： Ti/SnO2-Sb2O5/PbO2 electrode Chlorimuron-ethyl Cyclic voltammetry electrochemical oxidation Waste water treatment

electrochemical oxidation of humic acid at the antimony- and nickel-doped tin oxide electrode

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Frontiers of Environmental Science & Engineering 2014年第3期8卷 337-344页

作者： Chengli TANG Wei YAN Chunli ZHENG Department of Environmental Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

This work investigated the degradation of humic acid （HA） in aqueous solution by electrochemical oxidation with Antimony- and Nickel-doped Tin oxide electrode （Ni-Sb-SnO2/Ti electrode） as the anode. Initial concentrations of HA ranged from 3 to 9 mg-L 1. Under such a concentration scope, the degradation of HA was a mass transfer controlled process. Degradation rate increased with the increase of HA initial concentration. Test on the effect of tert-butanol revealed that · OH played an important role in the oxidation of HA. The absence of cation Ca2＋ was beneficial to HA degradation, which suggested that both indirect and direct electrolyze happened during the whole electrochemical oxidation process. Alkaly （pH = 12） and neutral （pH = 7） conditions were benefical to HA degradation.

关键词： electrochemical oxidation humic acid (HA) natural water Ni-Sb-SnO2/Ti electrode

electrochemical oxidation of L-Cysteine in Sodium Dodecyl Sulfate Admicelles

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Chinese Journal of Chemistry 2005年第4期23卷 404-408页

作者：李中春刘天晴郭荣 SchoolofChemistryandChemicalEngineering YangzhouUniversityYangzhouJiangsu225002China

The electrochemical oxidation of L-cysteine can be catalyzed by sodium dodecyl sulfate (SDS) admicelles. The catalytic efficiency increases hardly when SDS concentration is lower than the critical admicelle concentration (CAC) and increases rapidly when SDS concentration is between CAC and the critical micelle concentration (CMC), but decreases when SDS concentration is higher than CMC. Both results of rate constant k0 and Gibbs free energy ΔG≠ accord with that of catalytic efficiency.

关键词： L-cysteine sodium dodecyl sulfate (SDS) electrochemical oxidation admicelle catalysis

electrochemical oxidation of rhodamine B by PbO_2/Sb-SnO_2/TiO_2 nanotube arrays electrode

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Chinese Journal of Catalysis 2019年第6期40卷 917-927页

作者： Jia Wu Kai Zhu Hao Xu Wei Yan Xi’an XD Switchgear Electric Co. Ltd.Xi’an 710049ShaanxiChina Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

A PbO2/Sb-SnO2/TiO2 nanotube array composite electrode was successfully synthesized and its electrochemical oxidation properties were ***-emission scanning electron microscopy(FE-SEM)and X-ray diffraction(XRD)results showed that the PbO2 coating was composed of anα-PbO2 inner layer and aβ-PbO2 outer *** life measurement indicated that the composite electrode had a lifetime of 815 *** B(RhB)was employed as a model pollutant to analyze the electrocatalytic activity of the *** effects of initial RhB concentration,current density,initial pH,temperature,and chloride ion concentration on the electrochemical oxidation were investigated in *** coupled plasma atomic emission spectroscopy(ICP-AES)results suggested that the concentration of leached Pb^2+in the electrolyte during the electrocatalytic oxidation process can be ***,the degradation mechanism during the electrocatalytic oxidation process was proposed based on the results of solid-phase micro-extraction-gas chromatography-mass spectrometry(SPME-GC-MS).The high electrocatalytic performance of the composite electrode makes it a promising anode for the treatment of organic pollutants in aqueous solution.

关键词： TiO2 nanotube array electrochemical oxidation Rhodamine B Degradation mechanism

electrochemical oxidation of aniline by a novel Ti/TiO_xH_y/Sb-SnO_2 electrode

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Chinese Journal of Catalysis 2016年第11期37卷 1860-1870页

作者：李晓良徐浩延卫西安交通大学环境科学与工程系动力工程多相流国家重点实验室陕西西安710049

electrochemical oxidation of aniline in aqueous solution was investigated over a novel Ti/TiOxHy/Sb-SnO2 electrode prepared by the electrodeposition *** electron microscopy,X-ray diffraction,and electrochemical measurements were used to characterize its morphology,crystal structure,and electrochemical *** of aniline by the Ti/TiOxHy/Sb-SnO2electrode was investigated by ultraviolet-Visible spectroscopy and chemical oxygen demand（COD）analysis under different conditions,including current densities,initial concentrations of aniline,pH values,concentrations of chloride ions,and types of *** was found that a higher current density,a lower initial concentration of aniline,an acidic solution,the presence of chloride ions（0.2wt%NaCl）,and a three-dimensional（3D） reactor promoted the removal efficiency of *** degradation of aniline followed pseudo-first-order *** aniline（200 mL of 100mg·L-（-1）） and COD removal efficiencies reached 100%and 73.5%,respectively,at a current density of 20 mA·cm-（-2）,pH of 7.0,and supporting electrolyte of 0.5 wt%Na2SO4 after 2 h electrolysis in a 3D *** results show that aniline can be significantly removed on the Ti/TiOxHy/Sb-SnO2electrode,which provides an efficient way for elimination of aniline from aqueous solution.

关键词： Aniline Ti/TiOxHy/Sb-SnO2 electrode electrochemical oxidation Chloride ions Three-dimensional reactor

Enhanced electrochemical oxidation of phenol by introducing ferric ions and UV radiation

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Journal of Environmental Sciences 2008年第11期20卷 1386-1391页

作者： MAO, Xuhui WEI, Lin HONG, Song ZHU, Hua LIN, An GAN, Fuxing School of Resource and Environmental Science Environmental Engineering Department Wuhan University Wuhan 430079 China

The mineralization of phenol in aerated electrochemical oxidation has been *** results show that a cathodic Fenton process can occur when the Ti-0.3Mo-0.8Ni alloy material is used as cathode in solution containing ferric or ferrous ions; moreover,the reinforcement of cathodic Fenton process on the total organic carbon (TOC) removal rate of phenol is quite *** the metallic ions investigated,the ferric ion is the best catalyst for the electrochemical mineralization of phenol at initial...

关键词： mineralization phenol electrochemical oxidation cathodic Fenton process UV radiation