Characterization of La/S-TiO₂/SBA-15 Photocatalysts and the Photocatalytic Degradation of 2,4-Dichlorophenol

La and S co-doped TiO2 loading on mesoporous SBA-15 was synthesized by sol-gel method,and characterized by XRD,BET,UV-Vis and XPS.Its photocatalytic activity for degradation of 2,4-dichlorophenol under visible light was tested. With the catalyst dose of 0.3 g·L-1,the illumination time of 2 h and initial concentration of the 2,4-dichlorophenol at 50 mg·L-1,the sample of La-S-TiO2/SBA-15 showed the highest photocatalytic activity with the degradation rate of 50.09%,which was 7.9 times of commercial titanium dioxide P25.The intermediates in photocatalytic degradation of 2,4-dichlorophenol were analyzed by GC-MS and HPLC,and the main degradation pathway was analyzed.