کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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181482 | 459404 | 2009 | 4 صفحه PDF | دانلود رایگان |
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-TiO2 modified 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 0.55 V 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-TiO2 modified RRDE, providing a promising approach to investigate the photoelectrocatalytic degradation mechanism of organic pollutants like toxic nitrophenols.
Journal: Electrochemistry Communications - Volume 11, Issue 6, June 2009, Pages 1154–1157