| Effects of acidity,temperature and surfactants on electrochemical behavior of V~(5+) ion in sulfuric acid solutions |
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| 作者姓名： | 易清风 刘云清 赵红钢 周秀林 刘小平 宋和付 |
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| 作者单位： | Department of Chemical Engineering，School of Chemistry and Chemical Engineering，Department of Chemical Engineering，Department of Chemical Engineering，Department of Chemical Engineering Hunty oan Universif Science and Technology，Xiangtan 411201，China，Central South University，Changsha 410083，China，Hunan University of Science and Technology，Xiangtan 411201，China，Hunan University of Science and Technology，Xiangtan 411201，China，Hunan University of Science and Technology，Xiangtan 411201，China |
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| 基金项目： | Project(B3 9910 )supportedbytheResearchFoundationoftheEducationDepartmentofHunanProvince,China |
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| 摘 要： | 1 INTRODUCTIONSeveralredoxcouplesincludingCe4 +/Ce3+,Mn3+/Mn2 +,Co3+/Co2 +andV5+/V4 +etchaveat tractedmuchattentioninindirectelectrosynthesisofsomeorganiccompoundsandinmediatedelectro chemicaloxidationofbenzene ,aniline ,phenolandchlorinatedorganicsetc17] .Electrochemicalbehav ioroftheredoxcoupleCe4 +/Ce3+hasbeenstud ied8,9] .Beingstrongandselectiveoxidizingagents ,vanadiumsalts ,comparedwithcoppersalts ,weremoreefficienttocatalyzetheoxidationoftoluenetobenzaldehydeviaelectrochemica…
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Effects of acidity, temperature and surfactants on electrochemical behavior of V5+ ion in sulfuric acid solutions |
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| YI Qing-feng,LIU Yun-qing,ZHAO Hong-gang,ZHOU Xiu-lin,LIU Xiao-ping,SONG Hu-fu.Effects of acidity,temperature and surfactants on electrochemical behavior of V~(5+) ion in sulfuric acid solutions[J].Transactions of Nonferrous Metals Society of China,2003,13(6). |
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| Authors: | YI Qing-feng LIU Yun-qing ZHAO Hong-gang ZHOU Xiu-lin LIU Xiao-ping SONG Hu-fu |
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| Affiliation: | YI Qing-feng1,LIU Yun-qing2,ZHAO Hong-gang1,ZHOU Xiu-lin1,LIU Xiao-ping1,SONG Hu-fu |
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| Abstract: | The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V~(5+) ion on platinum electrodes were investigated. In voltammetric curves of V~(5+) ion there are two reduction peaks corresponding to reductions of V~(5+) to V~(4+) (R2) and V~(5+) to V~(3+) (R1), which are irreversible and quasi-reversible processes respectively. Oxidation peak of V~(3+) to V~(5+) is intensively affected by pH values on the electrode surface and scanning-potential rates. Only stronger acidity on the electrode surface and faster scanning-potential rates can lead to appearance of this oxidation peak. The neutral surfactant(PCBE) and cationic surfactant(CTAB) retard the V~(5+) electroreduction. The anionic surfactant(SDS), even at a very low concentration, increases the currents of both the reduction peaks R1 and R2, and the oxidation peak involves with the oxidation of H_2 to H~+. |
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| Keywords: | V~(5+) redox couple voltammetry electrochemistry |
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