光催化原位氧化聚合法制备聚吡咯/TiO_2复合材料及其可见光催化降解罗丹明B的性能  

Polypyrrole/TiO_2 nanocomposite prepared by in-situ photocatalytic polymerization and visible light activity for degrading rhodamine B

作　　者：王芳[1] 敏世雄[1] 靳治良[1] 续京[1] 

机构地区：[1]北方民族大学化学与化学工程学院,银川750021

出　　处：《化工新型材料》2015年第4期118-121,共4页New Chemical Materials

基　　金：北方民族大学校级项目(2014XZZ02;2014XYZ02);国家自然科学基金面上项目(21263001);北方民族大学国家自然科学基金前期培育项目(2014QZP04);宁夏回族自治区自然科学基金(NZ12203);国家民委科研项目(12BFZ008)

摘　　要：在无需引发剂的条件下,通过光催化原位氧化聚合法一步合成了聚吡咯/TiO2纳米复合材料(PPy/TiO2)。采用UV-Vis、XRD、XPS和FTIR技术对吡咯在TiO2表面的聚合过程和复合材料的结构进行了表征。以罗丹明B(RhB)的降解反应研究了PPy/TiO2复合材料的光催化性能。研究表明,紫外光(λ=365nm)激发TiO2形成电子-空穴对,空穴迁移至表面与吸附于TiO2表面的吡咯单体作用,迅速形成吡咯阳离子和低聚体,最终形成聚吡咯并包覆在TiO2的表面。光催化结果表明,PPy/TiO2复合材料可加速RhB在可见光和紫外光下的降解速率,所制备的PPy/TiO2复合材料是一种可应用于光电转化和光催化方面的多功能材料。Polypyrrole/TiO2 nanocomposites （PPy/TiO2） were synthesized by one-step in-situ photocatalytic oxida- tive polymerization method without need of additional initiator. UV-Vis, XRD, XPS,and FTIR were used to characterize the polymerization process and the structure of the resulted composites. Its photocatalytic activities were investigated by de grading rhodamine B in aqueous solution. The results showed that UV light with wavelength of 365nm can excite the TiO2 to generate electron and hole,and then the photogenerated hole can migrate and oxide the pyrrole adsorbed on TiO2 surface to form pyrrole cation and oligomer,whieh can consequently form polypyrrole on the TiO2 surface, resulting in PPy/TiO2 nanocomposites. The results of photocatalytic experiments showed that the degradation rate of RhB, under both visible and UV light,can be significantly accelerated in the presence of PPy/TiO2 composite, which can be used as a multifunctional materials in photoelectrical conversion and photocatalysis.

关 键 词：聚吡咯 TiO2 复合材料 光催化氧化 原位聚合 

分 类 号：O633.5[理学—高分子化学] TB332[理学—化学]