掺Fe3+改性A-TiO2的合成及其对曙红的可见光催化降解性能

Synthesis of Doping Fe3+ Modified TiO2 and Its Photo-catalytic Property for Degradation of Eosin under Visible Light

采用水热法合成了系列含不同掺Fe^3+量的改性TiO2 粉末( 1^x , x=0、 2、 4、 5、 6、 8,掺铁量分别为0、 2 mol%、 4 mol%、 5 mol%、 6 mol%和8 mol%),其结构和形貌经XRD和SEM表征。并研究可见光照下 1x 对曙红降解的催化效果,考察了不同因素的影响和光催化剂对曙红的暗吸附性能。结果表明: 1 x 的晶体为单一锐钛矿型(A-TiO2 ),由直径2~3 μm的 1x 微米球堆积而成;在15 mg·L^-1 曙红溶液(pH=4)中, 15 投放量为7 g·L^-1 ,于室温(18 ℃)可见光(功率40 W的白炽灯)照射反应3 h,曙红降解率 D 最大(63.1%),在该光催化优化条件下进行暗吸附,1.5 h达到吸附平衡, 1 5 对曙红吸附量为1.01 mg·g^-1 。

The doping Fe^3+ modified TiO2 powder( 1x , x=0, 2, 4, 5, 6, 8, the doping Fe 3+ amount was 0, 2 mol%, 4 mol%, 5 mol%, 6 mol% and 8 mol%, respectively), was synthesized by hydrothermal method. The structure and morphology were characterized by XRD and SEM. The catalytic effects of 1x on the degradation of eosin under visible light was studied, the influence of different factors and the dark adsorption performance of the photocatalyst on eosin were investigated. The results showed that the crystal of 1 x was a single anatase type(A-TiO 2 ), which is composed of A-TiO 2 microsphere with a diameter of 2 μm and 3 μm. The degradation rate D of eosin was 63.1% under the following optimizing conditions: the initial concentration of eosin was 15 mg·L^-1 (pH=4), the dosage of 1 5 was 7 g·L^-1 , and the illumination time was 3 h under visible light(40 W filament lamp) at room temperature(18 ℃). The dark adsorption was carried out under the optimum condition of photocatalysis, the adsorption equilibrium was reached for 1.5 h, the adsorption capacity of the synthesized catalyst to eosin was 1.01 mg·g^-1 .