Voltammetric Studies on Heteropoly Phosphotungstovanadate Anions Across the Liquid/Liquid Interface

Chemical Research in Chinese Universities ›› 2003, Vol. 19 ›› Issue (3): 290-293.

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Voltammetric Studies on Heteropoly Phosphotungstovanadate Anions Across the Liquid/Liquid Interface

LU Xiao-quan

Institute of Chemistry, Northwest Normal University, Lanzhou 730070, P. R. China

Received:2002-06-18 Online:2003-08-24 Published:2011-08-06
Supported by:
Supported by the Natural Science Foundation of China(No.20275031), the Teaching and Research Award Program for Outstanding Young Techers in High Education of MOE of China and KJCX-01 of Northwest Normal University.

Abstract

Abstract: Electrochemical transfer behavior of V^ⅤW₁₁-V₃^ⅤW₉ heteropoly anions on the water/nitrobenzene interface was investigated by means of cyclic voltammetry. The effect of the solution acidity on the transfer behavior and the stable pH range for the heteropoly anions were studied. The stability of mixed tungstovanadate decreases with increasing the number of vanadium atoms. The main transfer species within the potential window have the negative charges of 4 and the transfer process is diffusion-controlled. The apparent transfer potential Δ^w_oΨ⁰ and the free energy ΔG⁰_tr^w→o for the heteropoly anions can be obtained from the experimental data. For the different anions, the Δ^w_oΨ_1/2-pH relationship can be expressed as: Δ^w_oΨ_1/2=constant-53pH.

Key words: Heteropoly phosphotungstovanadate anion, Voltammetry, Liquid/liquid interface

LU Xiao-quan. Voltammetric Studies on Heteropoly Phosphotungstovanadate Anions Across the Liquid/Liquid Interface[J]. Chemical Research in Chinese Universities, 2003, 19(3): 290-293.

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Voltammetric Studies on Heteropoly Phosphotungstovanadate Anions Across the Liquid/Liquid Interface

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