【摘要】 采用原位聚合的方法合成了聚吡咯/二氧化钛(PPy/TiO2)纳米复合材料,研究了吡咯(Py)与TiO2的比例、氧化剂的种类、掺杂酸的浓度等因素对PPy/TiO2纳米复合材料在太阳光下光催化降解甲基橙的影响,采用透射电镜、紫外-可见漫反射吸收光谱等方法对样品进行了表征。结果表明,PPy/TiO2纳米复合粒子在太阳光下的光催化活性明显高于TiO2纳米粒子,当Py与TiO2的比例为1:100,三氯化铁为氧化剂,1.0mol·L-1盐酸溶液为掺杂剂时PPy/TiO2纳米复合粒子在太阳光下的光催化活性最高;TiO2纳米微粒以及PPy/TiO2纳米复合微粒的粒径均为10~20nm,复合微粒的粒径没有明显的增大,但是减轻了纳米粒子之间的团聚;聚吡咯使TiO2纳米粒子的禁带宽度由3.12eV降低到2.84eV,TiO2纳米粒子的吸收波长拓展到可见光区,有利于TiO2纳米粒子在太阳光下光催化活性的提高。更多还原

【Abstract】 PPy/TiO2 nanocomposites were prepared by in situ polymerization, and the effects of the ratios of Py and TiO2, oxidant kinds and dopant concentrations on the photocatalytic activities of PPy/TiO2 nanocomposites were studied by the degradation of methyl orange under sunlight irradiation. Nanoparticles were characterized by means of transmission electron microscopy (TEM) and UV-vis-diffuse reflectance spectroscope (DRS). The results show the photocatalytic activitives of PPy/TiO2 nanocomposites are better than those of TiO2 nanoparticles, and optimal when the ratio of Py and TiO2 is 1:100, FeCl3 as oxidant, 1.0mol·L-1 HCl aqueous solution as dopant. TEM results show that the mean sizes of both neat TiO2 nanoparticles and PPy/TiO2 nanocomposites are 10-20nm, and the sizes of nanocomposite particles don’t increase while their aggregation is alleviated. DRS results suggest PPy decreases the banding gap energy of TiO2 from 3.12eV to 2.84eV, and improves visible light response which can enhance the photovatalytic activities of TiO2 nanoparticles under sunlight.更多还原