Co掺杂TiO2光催化剂的研究

摘要

采用溶胶-凝胶法制备了Co掺杂TiO2粉体(Co-TiO2),采用 XRD、FT-Raman、UV-Vis、PL 等方法对其进行表征和分析。结果表明,Co 掺杂降低了TiO2的相转变温度,拓展了 TiO2对可见光的吸收范围,有效地抑制了光生电子-空穴对的复合。光催化降解亚甲基蓝(MB)的实验表明,n (Co)∶n (Ti)=0.002,400℃烧结的 Co-TiO2粉体具有最佳光催化性能,在普通日光灯下对亚甲基蓝的降解率达90.56%,明显优于德国 Degussa 公司生产的 P25纯TiO2光催化剂对亚甲基蓝的降解率44.95%。%Co doped TiO2 powder (Co-TiO2 )were synthesized by sol-gel method.The obtained samples were characterized by XRD,FT-Raman,UV-Vis,PL,respectively.The results show that Co-doping can decrease the phase transition temperature,broaden the absorption spectrum to the visible light region,and inhibit the re-combination of photoelectron-hole pairs.The experiments of photocatalytic degradation of methylene blue (MB)indicate that the photocatalytic activity of the Co-TiO2 powder prepared at n(Co)∶n(Ti)=0.002 and the calcinated temperature of 400 ℃ was the best.Under the fluorescent light irradiation,the degradation rate of the Co-TiO2 sample to methyl blue reaches 90.56%,which was obviously higher than 44.95% of P25 TiO2 photocatalyst which made in Degussa,German.