两种钛基涂层电极电催化氧化酸性品红研究

A Study on Electro-catalytic Oxidation of Acid Fuchsin Using Two Ti-base Electrodes with Coating

采用热氧化法制备了Ti/SnO_2和Yi/SnO_2-Sb_2O_3电极,以酸性品红为研究对象,对比了两种电极材料的电催化效果。结果表明:相对于Ti/SnO_2阳极,Ti/SnO_2-Sb_2O_3阳极对酸性品红有着更好的去除效率和降解速率。两种电极的电催化氧化过程均符合一级动力学模型。酸性品红在Ti/SnO_2-Sb_2O_3阳极上电催化氧化降解过程的紫外-可见光谱图表明在电流密度75 mA·cm^(-2),电解质Na_2SO_4浓度12 g·L^(-1)的条件下,处理100 mg·L^(-1)的酸性品红模拟废水,60 min内其在λ_(max)=545 nm的特征吸收峰消失,酸性品红基本去除,但同时生成了部分小分子中间产物。

Ti/SnO2, Ti/SnO2-Sb2O3 electrodes are prepared by thermal decomposition method. Using these electrodes as anodes and acid fuchsin oxidation as the simulated dye wastewater, the electro-catalytic oxidation capacities of two anodes are compared. The results show that the electro-catalytic ability of Ti/SnO2-Sb2O3 electrode by thermal decomposition method is markedly better than Ti/SnO2 electrode. The kinetic models of the both electrodes established according to the test data complied with first order kinetic model and are checked respectively. From the UV-VIS spectra of the Ti/SnO2-Sb2O3 electrode generated under the condition of initial concentration of acid fuchsin 100 mg·L^- 1, the current density 75 mA-cm^-2 and the electrolyte concentration （Na2SO4） 12 g·L^-1, we find that the characteristic absorption peak of acid fuchsin at ）,λmax= 545nm nearly disappeared in 60 min and the acid fuchsin is removed. However, some small molecular intermediate products are generated in the electro-catalytic oxidation.