TiO2光催化降解聚乙烯薄膜

TiO2光催化降解聚乙烯薄膜;纳米TiO2;固相光催化;聚乙烯塑料;降解

Photodegradation of Polyethylene Films Catalyzed by TiO2

A nano-size TiO_(2) photocatalyst was prepared readily by the Sol-gel method, and was used to (catalyze) the degradation of PE films under UV(15 W intensity) irradiation for 240 h in air. The properties of the catalyst and the degraded PE films were characterized by XRD, FT-IR and SEM. The results show that PE films lose only 7.66% of its mass under UV irradiation for 240 h, while Rutile style TiO_(2) and Anatase TiO_(2) photocatalysts can increase the mass loss to 14.93%, and 23.97%, respectively, indicating that TiO_(2) speeds up the breaking and photo oxidation of PE chains. The SEM micrograph of the PE film after photodegradation shows a large number of pits on the film surface. The XRD patterns indicate there was more wax in the degradation products in the presence of TiO_2. Anatase style TiO_(2) exhibited a higher activity than Rutile style TiO_(2) for the photodegradation of PE films.