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首页> 外文期刊>International Journal of Electrochemical Science >Photoelectrochemical degradation of methylene blue dye under visible light irradiation using EG/Ag-ZrO2 nanocomposite electrodes
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Photoelectrochemical degradation of methylene blue dye under visible light irradiation using EG/Ag-ZrO2 nanocomposite electrodes

机译：EG / Ag-ZrO 2 纳米复合电极在可见光下光电化学降解亚甲基蓝染料

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The present study reports the application of three electrodes, consisting of exfoliated graphite (EG), EGand zirconium oxide (EG-ZrO 2 ), and EG and silver-doped zirconium oxide (EG/Ag-ZrO 2 ) in acomparative photoelectrochemical degradation of methylene blue (MB) dye in water under visible lightirradiation. The Ag-ZrO 2 is prepared using a sol-gel method and used in the fabrication of EG/Ag-ZrO 2electrodes via a wet solution method. The morphologies, crystalline structures, andsurface/physicochemical properties of the nanocomposites are characterized by SEM, TEM, XRD, andUV-Vis, FTIR, and Raman spectroscopies. The SEM results show that ZrO 2 and Ag-ZrO 2 are evenlydispersed on the surfaces of EG. The XRD and Raman analyses reveal that ZrO 2 exists in the tetragonalphase. The modification of ZrO 2 with EG and Ag results in electrodes with strong absorption in thevisible light region. All fabricated electrodes display the capacity to degrade MB, with EG/Ag-ZrO 2exhibiting the highest degradation efficiency and EG the lowest. The electrode with the highestefficiency (EG/Ag-ZrO 2 ) is used in optimization studies, which identify the optimum conditions requiredfor maximizing the efficiency of the degradation process. In addition, the EG/Ag-ZrO 2 is used in thedegradation of MB via photolysis, as well as electrochemical and photoelectrochemical methods. Thephotoelectrochemical method exhibits superior performance when compared to photolysis andphotocatalytic methods in the degradation of MB. The synergistic effects of Ag and ZrO 2 enhance theefficiency of EG/Ag-ZrO 2 toward the degradation of MB.
机译：本研究报告了由剥落石墨（EG），EG和氧化锆（EG-ZrO 2）以及EG和掺杂银的氧化锆（EG / Ag-ZrO 2）组成的三个电极在亚甲基光电化学降解中的应用可见光照射下的水中蓝色（MB）染料。使用溶胶-凝胶法制备Ag-ZrO 2，并通过湿溶液法将其用于EG / Ag-ZrO 2电极的制造。纳米复合材料的形貌，晶体结构和表面/理化性质由SEM，TEM，XRD和UV-Vis，FTIR和拉曼光谱学表征。 SEM结果表明，ZrO 2和Ag-ZrO 2均匀分散在EG表面。 XRD和拉曼分析表明ZrO 2存在于四方相中。用EG和Ag修饰ZrO 2导致电极在可见光区域具有强吸收性。所有制造的电极均具有降解MB的能力，其中EG / Ag-ZrO 2降解效率最高，而EG最低。效率最高的电极（EG / Ag-ZrO 2）用于优化研究，该研究确定了使降解过程效率最大化所需的最佳条件。另外，EG / Ag-ZrO 2还用于通过光解以及电化学和光电化学方法降解MB。与光解法和光催化法相比，光电化学法在MB降解方面表现出优异的性能。 Ag和ZrO 2的协同作用增强了EG / Ag-ZrO 2对MB降解的效率。

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