Kinetics and Mechanism of Oxidation of Triethanolamine by Diperiodatonickelate(Ⅳ) Ion in Aqueous Medium

Abstract

Abstract: The kinetics of oxidation of triethanolamine by dihydroxydiperiodatonickelate(Ⅳ) ion(DPN) was studied by spectrophotometry in aqueous medium. The reaction was found to be pseudo-first order with respect to Ni(Ⅳ) and to be fractional order with respect to triethanolamine. The rate increased with the increase of the concentration of OH^- and decreased with the increase of the concentration of IO₄^-. The observed rate constants: k_obs=(k₁+k₂[OH^-])k₁k₂[OH^-][TEA]/{[H₂IO₆^3-]+K₁[OH^-]+k₁k₂[OH^-][TEA]}. Based on these, a mechanism involving the form of activative complex between Ni(Ⅳ) and reduct(TEA) was proposed. In addition, we calculated the equilibrium constants and rate-determining constants at 28 ℃, which were k₁=8 008×10^-2s^-1, k₂=0 289 6 mol^-1·L·s ^-1, K₁=2 063 and K₂=36 471 L·mol ^-1.

Key words: Dihydroxydiperiodatonickelate(Ⅳ), Triethanolamine, Redox reaction, Kinetics and mechanism

CLC Number:

O643

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SHAN Jin-Huan, WEI Hai-Ying, WANG Li, SHEN Shi-Gang LIU Bao-Sheng, SUN Han-Wen, WANG An-Zhou . Kinetics and Mechanism of Oxidation of Triethanolamine by Diperiodatonickelate(Ⅳ) Ion in Aqueous Medium[J]. Chem. J. Chinese Universities, 2002, 23(10): 1860.

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Kinetics and Mechanism of Oxidation of Triethanolamine by Diperiodatonickelate(Ⅳ) Ion in Aqueous Medium

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