改性纳米TiO2固相光催化降解LDPE薄膜的研究

采用苯乙烯接枝改性纳米二氧化钛（TiO2-g-PS）颗粒作为催化剂，制备了一种新型可光催化降解的TiO2-g-PS /LDPE纳米复合薄膜，并在空气中紫外光照下进行了薄膜的固相光催化降解。利用热失重、傅立叶红外光谱和扫描电子显微镜等对光照前后纯LDPE、TiO2/LDPE和TiO2-g-PS /LDPE复合薄膜进行分析表征。结果表明，改性颗粒的催化活性较高，能有效地降解聚乙烯薄膜，复合薄膜经紫外光照336 h后，光降解失重率达到36.2 %。

Preparation and Solid-Phase Photocatalytic Degradation of LDPE Nanocomposite Film Filled with Grafted Nano-TiO2

A novel photodegradable low-density-polyethylene nanocomposite film filled with grafted nano-TiO2 (TiO2-g-PS/LDPE) was prepared by embedding polystyrene (PS) grafted TiO2 into the commercial LDPE. Solid-phase photocatalytic degradation of TiO2-g-PS/LDPE nanocomposite film was carried out in ambient air at room temperature under ultraviolet irradiation. The properties of the nanocomposite film were compared with that of pure LDPE film and TiO2/LDPE film by TG, FTIR and scanning electron microscope (SEM). The results showed that the photo-induced degradation of TiO2-g-PS/LDPE nanocomposite film was significantly faster than that of pure LDPE film and TiO2/LDPE film. The weight loss of TiO2-g-PS/LDPE nanocomposite film reached 36.2 % under ultraviolet irradiation for 336 h.