【摘要】 利用线性伏安法、LC/MS和光谱技术研究了Pt电极在电化学氧化降解对氯苯酚过程中的失活现象.结果表明,由于电极表面的聚合反应,Pt电极会在短时间内失活.现场红外分析表明,电氧化过程中Pt电极在1 200 cm-1和1 800 cm-1处分别出现了芳醚和羰基的特征吸收峰.提高对氯苯酚初始浓度和溶液pH均会加快电极的失活速率.对失活Pt电极的乙腈浸洗液进行LC/MS分析表明,电极表面形成的聚合物并不是具有单一结构的化合物,而是一些混合物,其形成的机理主要包括自由基之间的相互偶合、自由基与底物、中间产物或低聚物的取代反应等方式.更多还原

【Abstract】 Deactivation of Pt electrode in the process of electroxidation of p-chlorophenol（p-CP） was investigated using linear sweep voltammetry,LC/MS and spectrum analysis techniques.The experiment results indicated that Pt would lose its electro-catalytic activity soon because polymer formed at the electrode surface.The in-site IR spectra of Pt showed two weak absorption bands appeared at（1?200） and（1?800） cm^-1 during the oxidation of p-CP,which are characteristics of aromatic ether and carbonyl group,respectively.Increasing initial concentration of p-CP and pH value of solution would accelerate the deactivation speed of Pt. Acetonitrile lixivium for deactivated Pt was analyzed by LC/MS,and it was found that the polymers formed at the surface of Pt were some mixed compounds.The mechanism of polymerization includes the following ways: coupling reaction of organic radical each other;substituting reaction of organic radical with p-CP（or intermediates or small polymers）.更多还原