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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。
The polypyrrole / TiO2 nanocomposite (PPy / TiO2) was synthesized by photocatalytic in situ oxidation polymerization without initiator. The polymerization process of pyrrole on the surface of TiO2 and the structure of the composites were characterized by UV-Vis, XRD, XPS and FTIR. The photocatalytic activity of PPy / TiO2 composites was investigated by the degradation of rhodamine B (RhB). The results show that ultraviolet (λ = 365 nm) excites TiO2 to form electron-hole pairs, and the holes migrate to the surface and react with the pyrrole monomer adsorbed on the surface of TiO2 to form pyrrole cations and oligomers rapidly. Finally, polypyrrole is formed Cover the surface of TiO2. The photocatalytic results show that the PPy / TiO2 composites can accelerate the degradation rate of RhB under visible light and ultraviolet light. The prepared PPy / TiO2 composite material is a kind of multifunctional material which can be applied in the photoelectric conversion and photocatalysis.