聚吡咯修饰膜开路还原Cr(Ⅵ)的动力学

The kinetics on open-circuit reduction of Cr(Ⅵ) by polypyrrole-modified film

以对甲苯磺酸钠为掺杂剂,在不锈钢电极上电化学合成聚吡咯修饰膜,采用该修饰膜在开路模式下还原Cr(Ⅵ),比较了氧化态和还原态聚吡咯对Cr(Ⅵ)的还原作用。结果表明氧化态聚吡咯对Cr(Ⅵ)有较好的吸附作用。但还原态聚吡咯对Cr(Ⅵ)的去除率高于氧化态聚吡咯。提出了聚吡咯修饰膜开路还原Cr(Ⅵ)的动力学方程。

Polypyrrole（ppy） films were electropolymerized from a para-toluenesulfonic sodium solution on stainless steel（SS）.The reduction of Cr（Ⅵ） by ppy-modified electrode at open-circuit mode was studied.The ability of oxidative ppy and reductive ppy on Cr（Ⅵ） removal was compared.It is found that the oxidative ppy could remove Cr（Ⅵ） effectively by adsorption process.However,reductive ppy displays higher removal efficiency than oxidative ppy.The kinetics of open-circuit reduction on Cr（Ⅵ） by ppy-modified film was proposed.