TiO_2/共轭高分子纳米复合材料在自然光下的光催化性能

Photocatalytic Activity of TiO_2/Conjugated Polymer Composite under Natural Light

以PVC和TiCl4为原料,利用溶胶-凝胶法制备了复合光催化剂前驱物,经260℃热处理后得到了TiO2/共轭高分子（CP）纳米复合光催化剂材料。通过亚甲基蓝的光催化降解研究了该催化剂的催化性能,并用TEM、XRD、IR和UV-Vis等测试技术对复合材料的结构进行了表征。结果表明,在自然光作用下,当焙烧温度为260℃并且TiO2的质量分数为66.36%,复合催化剂在15 min内可使亚甲基蓝的降解率接近80%,催化活性优于纯TiO2。复合材料颗粒平均尺寸约30 nm,其中TiO2为锐钛矿型结构。CP与TiO2复合后能吸收紫外-可见区的全程光波（λ为190-800 nm）,对光生电荷具有很高的分离能力,从而表现出较高的催化活性。

Precursor of complex materials was synthesized by sol-gel method from TiCl4 and PVC.The nano-meter TiO2/conjugated polymer（TiO2/CP） composite photocatalyst was prepared by calcinating the precursor at 260 ℃.TEM,XRD,FTIR and UV-Vis were used to characterize the composite photocatalyst and its photocatalytic activity for the degradation of dye methylene blue（MB） was studied.The results show that under the irradiation of natural light,when the calcination temperature was 260 ℃ and the TiO2 content was 66.36%,MB could be degraded more efficiently on the TiO2/CP than on pure nanometer TiO2.The average size of the composite photocatalyst was about 30 nm.The crystalline structure of TiO2 in the composite was in anatase form.Doping of CP could extended the photoresponse of TiO2 to the light in the whole UV-Vis region（λ=190~800 nm）,resulting in efficient separation of photogenerated charges,hence the photocatalytic activity of composite photocatalyst was greatly enhanced.