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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 photodegradable PVC-OA-TiO2 nanocomposite film was prepared by embedding technology, and the photocatalytic degradation of the composite film under ultraviolet light irradiation was studied. The results showed that , The photocatalytic degradation of the nanocomposite film is an oxidative chain scission process, the weight loss rate reached 55% after 310 h UV irradiation, which is twice that of PVC-TiO2 composite film and 3.5 times that of pure PVC film, indicating that oxalic acid Doping can accelerate the degradation of PVC-OA-TiO2 composite film more quickly.H2O, as a good electron donor, irreversibly reacts with holes or surface hydroxyls on TiO2 surface to inhibit the recombination of electrons and holes, Thus significantly improving the photocatalytic degradation rate of PVC-OA-TiO2.