TiO_2/沸石与活性炭三维粒子电极体系光电催化研究

Study on Photoelectrocatalytic Performance of Three-dimensional System of TiO_2/Zeolite and GAC Particle Electrode

采用溶胶-凝胶法制备沸石负载TiO2(TiO2/沸石)。将TiO2/沸石与活性炭按照不同比例混合为粒子电极,采用钛网作为主电极,硫酸钠溶液为助电解质,紫外灯为光源建立了三维电极光电催化体系,处理亚甲基蓝模拟废水。实验表明:当电极间距为4.0 cm、TiO2/沸石∶活性炭=2∶3、亚甲基蓝的初始浓度为3 mg/L,灯距为10 cm、电压为2.0 V、电解质浓度为0.04 mol/L、初始p H=6.0,光催化降解效率可达49.5%。三维电极光电催化效果优于二维电极光电催化与光催化效果。Fe3+离子掺杂提高了体系的光电催化效率,最大光电催化效率可达53.3%。

The TiO2/zeolites were prepared by sol-gel method and the three-dimensional photoelectrocatalytic system was constituted with TiO2/zeolite and GAC in different proportion as particle electrode, titanium nets as central electrode, sodium sulfate solution as electrolyte. Methylene blue（MB） solution as target waste water was treated. The photoelectrocatalytic experiments show that, the degradation rate can reach to 49.5% when the electrode gap is 4.0 cm, the ratio TiO2/zeolite to activated carbon is 2 to 3, the initial concentration of MB is 3 mg/L, the light distance is l0 cm, the voltage is 2.0 V, the concentration of electrolyte is 0.04 mo1/L and the initial p H is 6.0. The effect of three-dimensional photoelectrocatalytic system was proved better than that of two-dimensional photoelectrocatalytic system. Fe^3＋ doping on particle electrode can improve the system efficiency and the degradation rate is up to 53.3%.