Enhanced photodegradability of PVC plastics film by codoping nano-graphite and TiO2. (November 2020)

• Record Type: Journal Article
• Authors: Zhang, Yan; Sun, Tianyi; Zhang, Dashuai; Shi, Zaifeng; Zhang, Xiaopeng; Li, Chen; Wang, Lili; Song, Junjun; Lin, Qiang
• Is Part Of: Polymer degradation and stability. Volume 181(2020)
• Publication Date: 2020-11
• Subjects: Nano-G/TiO2/PVC composite film -- Nano-graphite -- TiO2 -- Photodegradation -- UV; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2020.109332
• Languages: English
• ISSNs: 0141-3910

Abstract

Highlights: 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". Abstract: 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".