聚苯胺/二氧化钛复合微粒的光催化性能研究

Study on Photocatalytic Properties of Polyaniline/Titanium Dioxide Composite Particles

利用原位聚合的方法制备出聚苯胺/二氧化钛复合材料。透射电镜、X射线衍射分析表征表明,聚苯胺修饰后的纳米二氧化钛形貌、晶型和粒径基本没有发生改变;紫外可见漫反射吸收光谱表征表明,PANI/TiO_(2)纳米复合微粒在可见光区的光吸收能力增强。当苯胺与二氧化钛的摩尔比为1:100,盐酸浓度为2 mol/L,可见光光催化效果最好。经过10次的稳定性循环测试后,降解率能保持在42%,说明复合材料有一定的稳定性。二氧化钛表面的聚苯胺能够吸收可见光的光子产生电子p-p*跃迁,聚苯胺的电子输运性可以有效分离光生电子-空穴对,降低电子-空穴复合的几率,提高了光催化活性。

Polyaniline/titanium dioxide composites were prepared by in-situ polymerization.Transmission electron micros⁃copy(TEM)and X-ray diffraction(XRD)analysis showed that the morphology,crystal shape and particle size of nano-TiO_(2) modified by polyaniline were basically unchanged.UV-vis diffuse reflectance absorption spectra showed that the light absorption capacity of PANI/TiO_(2) nanocomposite particles was enhanced in the visible region.When the molar ratio of ani⁃line to titanium dioxide is 1∶100 and the concentration of hydrochloric acid is 2 mol/L,the photocatalytic effect of visible light is best.After 10 stability cycle tests,the degradation rate can be maintained at 42%,indicating that the composite has a certain stability.Polyaniline on the surface of titanium dioxide can absorb visible photons to produce electron p-p*transi⁃tion.The electron transport property of polyaniline can effectively separate photogenerated electron-hole pairs,reduce the probability of electron-hole recombination,and improve the photocatalytic activity.