Study of photoelectrocatalytic degradation behavior of p-nitrophenol with nano-TiO2 modified film at a rotating ring–disk electrode
Study of photoelectrocatalytic degradation behavior of p-nitrophenol with nano-TiO2 modified film at a rotating ring–disk electrode
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DOI：
10.1016/j.elecom.2009.03.035
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发表时间：
2009-06
影响因子：
5.4
通讯作者：
B. Su;Yongjun Ma;Yongling Du;Chunming Wang
中科院分区：
文献类型：
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作者：
B. Su;Yongjun Ma;Yongling Du;Chunming Wang
采用流体动力学微分脉冲伏安法（HDPV）技术研究了对硝基苯酚（pNP）的光电催化降解行为。该方法应用于纳米TiO2修饰的铂旋转环盘电极（RRDE）作为多功能工作电极。在 pNP 光电催化降解过程中，通过强制输运，在流体动力学条件下，在旋转的铂环电极上立即记录中间产物的伏安响应。约0.55V处的明显阳极峰主要归因于光生强氧化剂（羟基自由基，OH）与pNP之间直接反应形成电活性中间产物，即对苯二酚（HQ）的结果。目前的工作表明，HDPV可以有效地用于原位监测纳米TiO2修饰的RRDE中间产物的形成，为研究有毒硝基苯酚等有机污染物的光电催化降解机理提供了一种有前途的方法。
The photoelectrocatalytic degradation behavior of p-nitrophenol (pNP) was investigated by using hydrodynamic differential pulse voltammetry (HDPV) technique. The method was applied on a nano-TiO2modified platinum rotating ring–disk electrode (RRDE) as versatile working electrode. The voltammetric response of the intermediate product was recorded instantly at the rotating platinum-ring electrode under hydrodynamic conditions via compulsive transport during the photoelectrocatalytic degradation process of pNP. A distinct anodic peak at about 0.55V is mainly attributed to the result of the formation of electroactive intermediate product, namely hydroquinone (HQ), through the direct reaction between photo-generated powerful oxidant (hydroxyl radicals, OH) and pNP. The present work has demonstrated that HDPV can be effectively used to in situ monitor the formation of intermediate product at nano-TiO2modified RRDE, providing a promising approach to investigate the photoelectrocatalytic degradation mechanism of organic pollutants like toxic nitrophenols.