可见光催化剂La/S-TiO<sub>2</sub>/SBA-15的表征及其对2,4-二氯酚的降解

可见光催化剂La/S-TiO₂/SBA-15的表征及其对2,4-二氯酚的降解

摘要: 采用溶胶凝胶法制备La-S-TiO2/SBA-15催化剂,并采用XRD、BET、UV-Vis和XPS对材料进行表征,在可见光下对2,4-二氯酚进行光催化降解.催化剂投加量为0.3 g·L-1,光照时间为2 h时,对50 mg·L-1的2,4-二氯酚的样品表现出最高的光催化活性,降解率达到50.09%,为P25的7.9倍.通过高效液相色谱,气相色谱-质谱法分析了2,4-二氯酚光催化降解的中间产物,并对其降解途径进行了简单分析.

Abstract: 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.