ANODIC BEHAVIOR OF PYRITE IN ACID-SOLUTIONS
ANODIC BEHAVIOR OF PYRITE IN ACID-SOLUTIONS
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DOI：
10.1016/0013-4686(79)87029-2
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发表时间：
1979-01-01
影响因子：
6.6
通讯作者：
SWIFT, DA
中科院分区：
文献类型：
--
作者：
BIEGLER, T;SWIFT, DA
在酸性溶液中，黄铁矿产生重现性好的阳极电流为3V，̄斜率为95±10 mV。黄铁矿的半导性对阳极过程的动力学没有影响。由恒电位库仑分析和产物分析确定，这个过程是反应的组合，硫酸盐路线在常温下可达的电位范围内占主导地位，硫酸盐的产率随着电位的增加而线性增加。来自其他来源的数据表明，固定电位下的硫酸盐产率可能与温度无关。对硫及其化合物的电化学行为研究的证据表明，元素硫不是硫酸盐路线中的中间体。提出了含氧吸附中间体形成硫酸盐的机理，并对Temkin吸附条件下的动力学进行了分析。Tafel斜率和pH依赖关系表明第二个电子转移步骤是速率决定的。
In acid solution, pyrite gives reproducible anodic current3v̄oltage curves with Tafel slopes 95 ± 10 mV. There is no influence of pyrite semiconducting properties on the kinetics of the anode process. This process, as determined by coulometry at constant potential and product analysis, is a combination of the reactions and The sulphate route dominates over the potential range accessible at ambient temperature, and the sulphate yield increases linearly with potential. Data from other sources suggest that sulphate yield at fixed potential may be independent of temperature. Evidence from studies of the electrochemical behaviour of sulphur and its compounds leads to the conclusion that elemental sulphur is not an intermediate in the sulphate route. A mechanism for sulphate formation involving adsorbed oxygen-containing intermediates is postulated and the kinetics analysed under Temkin adsorption conditions. The Tafel slope and pH dependence suggest that the second electron transfer step is rate-determining.