摘要
以聚氯乙烯和四氯化钛为原料，利用溶胶-凝胶法制备了复合光催化剂前驱体，经适当热处理后得到了TiO2／共轭高分子（CP）纳米复合光催化剂材料，并用TEM、XRD、FTIR、ESR和UV—Vis等对复合材料进行了表征。结果表明，复合材料平均粒径约30nm，其中TiO2的结构为锐钛矿型，CP为具有活性基团和不同长度共轭链的高分子，且与TiO2之间存在相互作用。CP与TiO2的复合，拓宽了TiO2的光谱响应范围，使其能吸收紫外-可见区的全程光波（λ=190～800nm），而且对光生电荷具有很高的分离能力，从而使材料表现出较高的催化活性。在自然光作用下，该复合材料能在15min内使亚甲基蓝的降解率接近80％，催化活性优于纯的TiO2和PVC直接热处理产物。
Precursor of complex materials was synthesized by sol-gel method from the TiCl4 and PVC. The nanometer TiO2,konjugated polymer （TiO2/CP） complex photocatalyst was prepared by calcinating the precursor at appropriate temperature, and charactered by TEM, XRD, FTIR, ESR, UV-Vis. The photocatalytic activity for the degradation of dye methylene blue （MB） was studied. The results showed that the average size of complex photocatalyst was about 30 nm. The crystalline structure of TiO2 in the complex nanomaterials was anatase form. CP was a conjugated polymer with different active groups on its chains and was closely linked with TiO2 by a strong interaction. Doping of CP could extended the photoresponse of TiO2 to the whole UV-Vis region（ λ = 190-800nm）, resulting in efficient separation of photogenerated charge, hence the photocatalytic activity of complex photocatalyst was greatly enhanced. Photocatalytic experiments indicated that under the irradiation of natural light, the degradation of methylene blue was more efficient on the TiO2/CP than on the pure nanometer TiO2 and the product of PVC by direct calcination lonely.
出处
《化学通报》
CAS
CSCD
北大核心
2008年第4期297-302,共6页
Chemistry
作者简介
敏世雄1979年9月生于甘肃临潭 2006年获西北师范大学化学化工学院物理化学硕士学位现系甘肃省河西学院讲师 从事纳米半导体光催化研究Email：msxwf@yahoo．com．cn
