绿色合成银修饰TiO2中空球及其可见光催化性能

摘要

采用绿色非模板法一步溶剂热合成高结晶度的介尺度TiO2中空球;将介孔结构、光利用和传质过程有机结合,以提高锐钛型TiO2的光催化性能,并通过时间分辨研究其生长机理,以罗丹明-B等染料为探针分子研究催化剂的光催化性能,TiO2表面负载Ag以改善TiO2光吸收性能.结果表明:实验合成TiO2中空球,形成过程遵循Ostwald机理;TiO2表面负载Ag增强可见光吸收,提高光生电子和空穴的分离效率,Ag修饰TiO2中空球可见光催化效率是未修饰样品的17倍.%Mesoscale TiO2 hollow spheres were synthesized via a facile green non-template one-step solvent thermal approach.The obtained spheres exhibited a mesoporous structure,efficient light utilization and enhanced mass transfer.The growth mechanism of the mesoscale spheres was studied via a time-dependent method.In addition,the TiO2 spheres deposited with Ag species were synthesized to improve the visible photocatalytic activity of TiO2.Rhodamine B was selected as an objective molecule and degraded on Ag/TiO2 samples.It is found that the modified TiO2 hollow spheres show excellent visible photocatalytic performance,which is 17 times higher than that of pure TiO2 spheres.