纳米铂微粒电极催化氧化有机污染物的研究

采用电化学阴极还原-阳极氧化方法制备了纳米铂微粒电极.电极表面的微观结构表征表明,铂微粒在三维网状的氧化钛膜孔道中呈均匀、高度分散状态,且粒径细小,铂微粒充分裸露,使得纳米铂微粒电极活性点多,电催化性能高.采用循环伏安法研究了铂微粒电极对有机小分子代表性物质甲醇的电催化氧化行为.结果表明,在酸性、中性和碱性介质中纳米铂微粒电极对甲醇的电催化氧化性能均明显优于光滑铂片电极,甲醇在纳米铂微粒电极上产生的氧化电流密度比光滑铂片电极高100倍以上.2种铂电极催化氧化降解甲醇、苯酚和甲基橙3种有机物时,纳米铂微粒电极的平均氧化电流效率是光滑铂片电极的数倍,这进一步表明纳米铂微粒电极对有机污染物具有良好的催化氧化降解能力.

Eletrocatalytic Oxidation for Organic Pollutant on the Nanoparticle Platinum Coated Titanium Electrode

The nanoparticle platinum coated titanium electrode was prepared using the method of electrochemical cathodic reduction followed by anodic oxidation .The surface microstructure of electrode has demonstrated that platinum particles dispersed in the three-dimensional network of channels of the titanium oxide film were in the supper-fine and well-distributed state. The nanoparticle platinum electrode owned plenty of active points and well electrocatalytic property based on the exposed platinum particles with very small diameters. Electrochemical behaviors of two kinds of platinum electrode for methanol has been performed through Cyclic Voltammetry. The results have showed that the nanoparticle platinum electrode had a much better electrocatalytic property for methanol than smooth platinum electrode in acidic, neutral or alkaline medium. The oxidation current densities on nanoparticle platinum electrode are over 100 times of that on smooth platinum electrode. Furthermore, the values of average current efficiency on nanoparticle platinum electrode are several times of that on smooth platinum electrode when degrading three kinds of organics methanol, phenol and methyl orange. This clearly revealed that the nanoparticle platinum electrode had stronger ability to degrade organic pollutants.