KINETICS AND MECHANISM OF THE REDOX REACTION BETWEEN Pt(IV) CHLORIDE COMPLEX IONS AND SODIUM THIOSULFATE IN AQUEOUS SOLUTION. PART I: ACIDIC SOLUTION

被引：1
|
作者：
Paclawski, K. [1 ]
Piwowonska, J. [2 ]
机构：
[1] AGH Univ Sci & Technol, Fac Nonferrous Met, PL-30059 Krakow, Poland
[2] Inst Nonferrous Met Gliwice, Hydromet Dept, PL-44100 Gliwice, Poland
来源：
ARCHIVES OF METALLURGY AND MATERIALS | 2014年 / 59卷 / 04期
关键词：
platinum complexes; thiosulfate; redox reaction; kinetics; rate law; rate constant; STEPWISE DISSOCIATION;
D O I：
10.2478/amm-2014-0241
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In this work, spectrophotometric studies of the kinetics and mechanism of reaction between [PtCl6](2-) complex ions and sodium thiosulfate, were carried out. The influence of different conditions, such as: initial concentrations of reductant and platinum(IV) complex ions, ionic strength, pH and temperature on the rate constant, was experimentally determined. From the obtained results, the molecularity of the first elementary step, value of the enthalpy and entropy of activation in Eyring equation as well as corresponding rate equation, were experimentally determined. It was found that the reaction is relatively slow and leads to the S, Pt and PtS colloids formation. The best conditions for solid phase formation containing Pt are at pH = 5.
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页码：1413 / 1420
页数：8
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