Effect of surfactants on the oxidation of oxalic acid by soluble colloidal MnO2

被引：27

作者：

Kabir-ud-Din ^{[1
]}

Fatma, W

Khan, Z

机构：

[1] Aligarh Muslim Univ, Dept Chem, Aligarh 202002, Uttar Pradesh, India

[2] Jamia Millia Islamia, Dept Chem, New Delhi 110025, India

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2004年 / 234卷 / 1-3期

关键词：

surfactants; manganese dioxide; oxalic acid; kinetics; sodium dodecyl sulfate; Triton X-100;

D O I：

10.1016/j.colsurfa.2003.12.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Kinetics of the oxidation of oxalic acid by water-soluble colloidal MnO2 has been studied spectrophotometrically in the absence and presence of non-ionic octylphenoxypolyethoxyethanol (Triton X-100, TX-100) and anionic sodium dodecyl sulfate (SDS) surfactant micelles. Anionic SDS micelles were found ineffective whereas those of TX-100 increased the rate that reached a plateau at higher [TX-100]. The reaction followed first- and fractional-order kinetics with respect to [MnO2] and [H+], respectively, both in the absence and presence of TX-100. The activation parameters (E-a, DeltaH(#), and DeltaS(#)) were evaluated and the effect of added manganese(II) sulphate is also reported in both aqueous and aqueous-micellar media. On the basis of experimental findings, a probable mechanism is proposed. The reaction proceeds through the adsorption of oxalic acid and hydrogen ions on the surface of the colloidal MnO2. Freundlich isotherm is used to explain the adsorption of oxalic acid on colloidal MnO2. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：159 / 164

页数：6

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