1. Z-scheme heterojunction g-C3N4-TiO2 reinforced chitosan/poly(vinyl alcohol) film: Efficient and recyclable for fruit packaging.
- Author
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Gao, Xianqiang, Cao, Lulu, Wang, Lulu, Liu, Shujun, Zhang, Mengting, Li, Changyu, Waterhouse, Geoffrey I.N., Fan, Hai, and Xu, Jing
- Subjects
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PACKAGING recycling , *FRUIT packaging , *EDIBLE coatings , *HETEROJUNCTIONS , *PACKAGING materials , *PRESERVATION of fruit - Abstract
Nanoparticles-loaded bio-based polymers have emerged as a sustainable substitute to traditional oil-based packaging materials, addressing the challenges of limited recyclability and significant environmental impact. However, the functionality and efficiency of nanoparticles have a significant impact on the application of bio-based composite films. Herein, graphitic carbon nitride (g-C 3 N 4) and titanium dioxide (TiO 2) coupled photocatalyst (g-C 3 N 4 -TiO 2) was prepared by one-step calcination and introduced into chitosan (CS) and polyvinyl alcohol (PVA) solution to fabricate g-C 3 N 4 -TiO 2 /CS/PVA green renewable composite film via solution casting method. The results demonstrated the successful preparation of a Z-scheme heterojunction g-C 3 N 4 -TiO 2 with exceptional photocatalytic activity. Furthermore, the incorporation of heterojunction enhanced mechanical properties, water barrier, and ultraviolet (UV) resistance properties of the fresh-keeping film. The g-C 3 N 4 -TiO 2 /CS/PVA composite film exhibited superior photocatalytic antibacterial preservation efficacy on strawberries under LED light, with a prolonged preservation time of up to 120 h, when compared to other films such as polyethylene (PE), CS/PVA, g-C 3 N 4 /CS/PVA, and TiO 2 /CS/PVA. In addition, the composite film has good recyclability and renewability. This work is expected to have great potential for low-cost fruit preservation and sustainable packaging, which also contributes to environmental protection. [Display omitted] • g-C 3 N 4 -TiO 2 Z -scheme heterojunction was prepared by a one-step calcination method. • The addition of g-C 3 N 4 -TiO 2 improved the mechanical, UV-barrier properties and water-blocking ability of CS/PVA film. • The g-C 3 N 4 -TiO 2 /CS/PVA composite film has excellent photocatalytic antibacterial and preservation properties. • The g-C 3 N 4 -TiO 2 /CS/PVA composite film is also green renewable and environmentally friendly. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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