一种新型可光降解的PVC-OA-TiO_2纳米复合膜  

A Novel Photodegradable Polyvinyl Chloride-Oxalic Acid-TiO_2 Nanocomposite Film

作　　者：法文君[1,2] 龚楚清[1] 杨昌军[1] 彭天右[1] 昝菱[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072 [2]许昌学院表面微纳米材料研究所,河南许昌461000

出　　处：《武汉大学学报（理学版）》2009年第5期501-504,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(20673078)

摘　　要：采用包埋技术制备了一种新型可光降解的聚氯乙烯-草酸-TiO2(PVC-OA-TiO2)纳米复合膜,并研究了紫外光照射条件下该复合膜的光催化降解情况.结果表明,该纳米复合膜的光催化降解是一个氧化断链过程,经紫外光照射310 h后失重率达到55%,是PVC-TiO2复合膜的2倍,是纯PVC膜的3.5倍,说明草酸的掺杂可以促进PVC-OA-TiO2复合膜更快地被光降解.草酸作为一个良好的电子给体,能不可逆地与TiO2表面产生的空穴或表面羟基反应,抑制电子和空穴的复合,从而显著提高PVC-OA-TiO2的光催化降解速率.A novel kind of photodegradable polyvinyl chloride-oxalic acid-TiO2 （PVC-OA-TiO2） nanocomposite film was prepared by blending the nano-TiO2 particles into the commercial PVC. Oxalic acid, as a good election donor, can suppress the recombination of electrons and holes on the TiO2 surface, so it enhances the photocatalytic efficiency of nano-TiO2. The weight loss of PVC-OA-TiO2 composite film reached 55% after 310 h UV-light irradiation, which was twice of PVC-TiO2 film or 3.5 times of pure PVC film. The results indicate that PVC-OA-TiO2 composite film has better photocatalytic degradation efficiency than PVC-TiO2 composite film and pure PVC film.

关 键 词：可光降解塑料 PVC-OA-TiO2复合薄膜 固相光催化降解 

分 类 号：O643.32[理学—物理化学]