A novel photodegradable Nano-G/TiO₂/PVC composite film was prepared by codoping nano-graphite (Nano-G) and TiO₂ photocatalyst in Polyvinyl chloride (PVC) plastic. The Characterization tests were performed by using ultraviolet-visible spectroscopy (UV-vis), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), gel permeation chromatography (GPC) and physical and mechanical properties. Compared with TiO₂/PVC, Nano-G/PVC and PVC film, the Nano-G/TiO₂/PVC composite film showed higher photodegradability. The weight loss rates of Nano-G/PVC (Nano-G 1 wt%), TiO₂/PVC (TiO₂ 1 wt%) and Nano-G/TiO₂/PVC (Nano-G 1 wt%, TiO₂ 1 wt%) films after the UV irradiation for 30 h were 7.68%, 8.94% and 17.24%, respectively, while that of PVC was only 2.12%. For the Nano-G/TiO₂/PVC composite film, the optimal doping amount of nano-graphite is 1 wt%. The decline rates of Mw and Mn of Nano-G/TiO₂/PVC (Nano-G 1 wt%, TiO₂ 1 wt%) composite film were 12.93% and 61.97%, respectively, which were much higher than that of PVC. Nano-graphite can effectively improve the migration and separation of TiO₂ photogenerated electrons, improving the photodegradation rate of PVC. The mechanism of the Nano-G/TiO₂/PVC composite film photocatalytic degradation was proposed. The photocatalytic technology is a feasible and effective way to solve "white pollution".

通过将纳米石墨（Nano-G）和TiO ₂光催化剂共掺杂在聚氯乙烯（PVC）塑料中，制备了一种新型的可光降解纳米G / TiO ₂ / PVC复合膜。通过使用紫外可见光谱（UV-vis），红外光谱（FT-IR），扫描电子显微镜（SEM），凝胶渗透色谱（GPC）以及物理和机械性能进行表征测试。与TiO ₂ / PVC，Nano-G / PVC和PVC薄膜相比，Nano-G / TiO ₂ / PVC复合薄膜具有更高的光降解性。Nano-G / PVC（Nano-G 1 wt％），TiO ₂ / PVC（TiO ₂ 1 wt％）和Nano-G / TiO ₂ / PVC（Nano-G 1 wt％，TiO ₂紫外线辐照30 h后的1 wt％膜分别为7.68％，8.94％和17.24％，而PVC仅为2.12％。对于纳米G / TiO ₂ / PVC复合膜，纳米石墨的最佳掺杂量为1重量％。纳米G / TiO ₂ / PVC（纳米G 1 wt％，TiO ₂ 1 wt％）复合膜的Mw和Mn的下降率分别为12.93％和61.97％，远高于PVC。纳米石墨能有效改善TiO ₂光生电子的迁移和分离，提高PVC的光降解速率。提出了纳米G / TiO ₂ / PVC复合膜光催化降解的机理。光催化技术是解决“白色污染”的一种可行而有效的方法。