外负载Ce-TiO_2/活性炭复合体对亚甲基蓝光催化

Photocatalysis of Methylene Blue by composites of cerium doped TiO_2-outerloaded activated carbon

用超临界流体沉积法处理过的活性炭(AC)为载体,钛酸丁酯为前驱物,硝酸铈为掺杂剂,乙醇为溶剂,制备了外负载TiO2-Ce/Csurf复合材料。在紫外灯照射下,以亚甲基蓝溶液为标准模拟降解物,研究了复合体不同热处理温度、不同浓度、不同亚甲基蓝浓度、不同铈掺杂量以及不同反应温度对光催化性能的影响。结果表明:外负载催化剂的催化性能要高于纯TiO2和体负载催化剂。铈离子掺杂能抑制TiO2晶粒生长,阻碍了TiO2由锐钛矿型向金红石型的转变。当铈离子掺杂量为1.5%,热处理温度为600℃,亚甲基蓝溶液初始浓度为5.5 mg/L,样品浓度为1.5 g/L时,光催化性能最好。

Cerium doped TiO2-outerloaded activated carbon were prepared by using supercritical fluid deposition with activated carbon （AC）, butyl acetate titanate, nitric acid cerium and ethanol as the carrier, precursors, doping agent and solvent, respectively. The photocatalytic activity was evaluated by the photocatalytic oxi- dation of Methylene Blue （MB） under UV irradiation. Meanwhile, the effects of preparing conditions including the different heat treatment temperature, different concentrations, different concentration of MB and different ce- rium doped quantity on the photocatalytic activity of composites were studied. The results show that TiO2-outerloaded composites have a higher degradation efficiency than pure TiO2 and TiO2-1oaded composites in MB degra- dation. Ce sustains crystalline growth and the doped Ce hindered the process of phase transition of TiO2 particles from anatase to rutile. The photocatalytic degradation rate constant of MB was highest under the optimum condi- tions that the concentration of cerium doped quantity was 1.5% with heat treatment temperature of 600℃ and concentration of MB solution of 5.5 mg/L when composites concentration was 1.5 g/L.