摘要：

采用溶胶-凝胶法制备了Fe³⁺/La³⁺共掺杂TiO₂/玻璃电极,并将其作为工作电极,以饱和甘汞电极作参比电极,金属Ag片为对电极,0.1 mol/L Na₂SO₄为支持电解质,建立了三电极光电催化体系,对十二烷基苯磺酸钠配制的表面活性剂废水进行降解。实验表明,Freundlich等温吸附方程能很好地描述Fe₃₊/La₃₊共掺杂TiO₂/玻璃电极对表面活性剂的吸附行为。实验同时考察了初始COD_Cr、外加偏压、电极面积、外加H₂O₂浓度以及涂覆层数对光电催化降解速率的影响,初步确定最佳的实验条件为:初始COD_Cr为20 mg/L,外加偏压为1.5 V,电极面积为44 cm²,外加H₂O₂浓度为55 mmol/L,涂覆层数为3层。

关键词: 光电催化, TiO₂薄膜, Fe3+/La3+共掺杂, 表面活性剂

Abstract:

Fe³⁺/La³⁺ co-doped TiO₂ electrode deposited on glass has been prepared by sol-gel method.The electrode is used as working electrode,saturated calomel electrode as the reference electrode,metal silver plate as the counter electrode,0.1 mol/L of Na₂SO₄ as supporting electrolyte.The three-electrode photoelectrocatalytic system which is used for degrading sodium dodecyl benzene sulfonate has thus been set up. Experiments show that the adsorption effect of Fe³⁺/La³⁺ co-doped TiO₂ catalysts on surfactant can be described nicely by Freundlich adsorption isotherm equation.The influences of the initial COD_Cr,additional voltage bias，area of electrode,additional concentration of H₂O₂ and the numbers of coating layer on photoelectrocatalytic degradation rate are investigated.The best experimental conditions are determined preliminarily as follows:the initial COD_Cr is 20 mg/L,additional voltage bias 1.5 V,area of electrode 44 cm²,additional concentration of H₂O₂ 55 mmol/L,and three coating layers.

Key words: photolectrocatalysis, TiO₂ film, Fe³⁺/La³⁺ co-doped, surfactant