Degradation of Rhodamine B Using an Unconventional graded Photoelectrode with Wedge Structure

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• 作者：Kan Li ; Yi He ; Yunlan Xu ; Yalin Wang ; Jinping Jia
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：September 1, 2011
• 年：2011
• 卷：45
• 期：17
• 页码：7401-7407
• 全文大小：922K
• 年卷期：v.45,no.17(September 1, 2011)
• ISSN：1520-5851

文摘

A graded TiO₂/Ti round disk photoelectrode with a wedge structure is proposed, fabricated, and used in a rotating disk photoelectrocatalytic (PEC) reactor for the first time. In addition to improved light utilization efficiency resulting from multiple reflections of radiation light on the wedge surface, enlarged surface area enables the electrode to carry more pollutants for treatment. Compared with the conventional planar electrode with same diameter, the wedge-surface electrode showed much lower light reflectivity (<0.014 versus 0.306), larger photocurrent and better treatment performance. For model dye wastewater containing Rhodamine B (RB) at concentrations ranging from 20 to 150 mg路L^鈥?, wedge-surface electrode removed 100鈥?9% total color in 60 min and 93鈥?8% COD in 150 min, much higher than 69鈥?8% and 50鈥?% obtained using the planar electrode under the same experimental conditions. Experimental results demonstrated that the wedge-surface electrode works efficiently and has great potential for treating high concentration dye wastewater.