Enhanced photodegradability of PVC plastics film by codoping nano-graphite and TiO2

• Published in: Polymer degradation and stability Vol. 181; p. 109332
• Main Authors: Zhang, Yan, Sun, Tianyi, Zhang, Dashuai, Shi, Zaifeng, Zhang, Xiaopeng, Li, Chen, Wang, Lili, Song, Junjun, Lin, Qiang
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.11.2020; Elsevier BV
• Subjects: composite films; gel chromatography; Graphite; Infrared spectroscopy; Liquid chromatography; Mechanical properties; Nano-G/TiO2/PVC composite film; Nano-graphite; Photocatalysis; photocatalysts; Photodegradation; photolysis; Physical properties; poly(vinyl chloride); Polyvinyl chloride; Studies; TiO2; Titanium dioxide; Ultraviolet radiation; ultraviolet-visible spectroscopy; Weight loss; Photodegradation; UV; Nano-graphite; Nano-G/TiO2/PVC composite film; TiO2
• ISSN: 0141-3910; 1873-2321
• DOI: 10.1016/j.polymdegradstab.2020.109332

•A novel photodegradable Nano-G/TiO2/PVC composite film was prepared by codoping nano-graphite and TiO2 photocatalyst in the PVC plastic.•The Nano-G/TiO2/PVC composite film shows the excellent photodegradability.•The mechanism of the Nano-G/TiO2/PVC composite film photocatalytic degradation was proposed.•The photodegradable Nano-G/TiO2/PVC composite film is one of the feasible and effective methods to solve "white pollution". 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".