介孔碳负载Ce-TiO_2的制备及其光催化降解亚甲蓝性能

以Ce(NO_3)_3·6H_2O、一水合柠檬酸、2-羟基对苯二甲酸、N,N-二甲基甲酰胺(DMF)、钛酸四丁酯为原料,通过水热法获得一种新型的Ce-Ti金属有机材料前驱体,将该前驱体在不同烧结温度下煅烧,获得一系列具有高比表面积的介孔碳负载Ce-Ti O_2新型催化剂。应用XRD、SEM、BET、TG、UV-vis DRS、UV紫外吸收等一系列手段对其进行了结构表征与性能测量。研究结果表明烧结温度在1000℃(CTOF-P10)的样品表现出良好的催化效果,其降解亚甲蓝(MB)的速率是商业型Ti O_2(P25)的2.15倍。引入Ce离子起到掺杂的作用,同时阻止Ti O_2晶粒的生长,也能抑制光生电子与空穴的复合,进而提高了光催化活性。

Preparation of Mesoporous Carbon-loaded Ce-TiO2 and Its Photocatalytic Degradation of Methylene Blue

The precursor of Ce-Ti metal organic material was synthesised by the hydrothermal method using Ce(NO3)3·6H2O, Citric acid, tetrabutyl titanate (IV) and 2-hydroxy terephthalic acid and N, N-dimethylformamide as raw materials.A series of mesoporous nanocomposites Ce-TiO2 with high specific surface area were obtained by different sintering temperatures.The structures and properties of the composites were characterized by XRD, SEM, BET, TG, UV-vis DRS and UV absorption spectroscopy.The results show that the photocatalyst calcinated at 1000 ℃ (CTOF-P10) exhibits excellent photocatalytic properties.The first-order kinetic constant of the degradation of methylene blue (MB) is 2.15 times higher than that of commercial TiO2 (P25).The introduction of Ce ions plays the role of doping, it's preventing the growth of TiO2 grains, and also inhibits the recombination of photogenerated electrons and holes.Consequently, the photocatalytic activity of the synthetic catalyst is dramatically enhanced.