溶剂热法制备高可见光活性TiO2-BiOI光催化剂及其光催化性能研究

Solvothermal Preparation of TiO2-BiOI Photocatalyst with High Visible-Light Photoactivity and Its Photocatalytic Performance

摘要:

通过溶剂热法将TiO2均匀负载到了BiOI花状微球上，制备了TiO2-BiOI复合光催化剂。XRD，FT-IR，XPS，SEM，TEM和UV-Vis-NIR对样品进行了表征。以甲基橙为目标降解物，研究了TiO2-BiOI复合光催化剂在可见光下的光催化性能。研究结果表明，纳米TiO2的复合为增加复合光催化剂的比表面积作出了贡献，TiO2与BiOI之间形成的异质结构可以促进光生电子和空穴分离，从而达到提高复合光催化剂光催化性能的目的。Ti:Bi摩尔比为0.4的TiO2-BiOI复合光催化剂表现出最佳的光催化降解效率，可见光（λ>420 nm）照射60 min对甲基橙的降解率达到了95%，光催化效率要远好于纳米TiO2和纯的BiOI光催化剂。

Abstract:

TiO2 nanoparticles were loaded on BiOI flower microspheres by solvothermal method. The obtained products were characterized by XRD, FT-IR, XPS, SEM, TEM and UV-VIS-NIR spectrophotometer. Methyl orange (MO) as the target pollutant, the photocatalytic activity of TiO2/BiOI composite was studied under visible light. The results showed that the performance was improved, because TiO2 nanoparticles was contributes to the increase in the specific surface area of the photocatalyst and the heterogeneous structure formed between TiO2 and BiOI could promote photogenerated electrons and hole separation. It was found that the highest photocatalytic activity could be realized when the molar ratio of Ti:Bi was 0.4, and the degradation rate was up to 95%, far higher than that of pure TiO2 nanoparticles and BiOI.