Journal
WASTE MANAGEMENT
Volume 145, Issue -, Pages 10-19Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2022.04.023
Keywords
Waste gelatin recycling; Biodegradable packaging film; Carboxymethyl cellulose; Olation-Zr4+ coordination; Strengthening
Categories
Funding
- Key Scientific Research Group of Shaanxi Province [2020TD-009]
- Key Scientific Research Program of Shaanxi Provincial Education Department (Collaborative Innovation Center project) [20JY003]
- Science and Technology Plan Project of Xi'an Weiyang District [201907]
- National Natural Science of China [22002079]
- Youth Innovation Team of Shaanxi Universities
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This study utilized gelatin extracted from waste skin scrap in the leather industry to fabricate a waste gelatin-based film with high gelatin content, excellent mechanical performance, and autonomous biodegradability, by introducing covalent bonds and metal-ligand bonds to the gelatin matrix, improving its properties significantly.
Large amount of gelatin can be extracted from the solid waste in leather industry. The advanced application of such gelatin is always desired by the leather industry, but remains challenging. Considering the urgent requirement of biodegradable plastic film, in this study, the gelatin extracted from waste skin scrap in the leather industry was used to fabricate a waste gelatin-based film with a high gelatin content, excellent mechanical performance, and autonomous biodegradability in natural soil. The film was prepared by introducing covalent bonds and metal-ligand bonds to the gelatin matrix. These covalent bonds, metal-ligand bonds, and inherent hydrogen bonds in the gelatin matrix serve as multiple sacrificial bonds for effective energy dissipation giving the waste gelatin-based film excellent mechanical parameters with the highest fracture stress of asymptotic to 32 MPa, maximum fracture strain of asymptotic to 1.25 mm/mm, and a high Young's modulus of asymptotic to 471 MPa, which are significantly higher than those of the original gelatin film (fracture stress asymptotic to 4 MPa, fracture strain asymptotic to 0.70 mm/mm, and Young's modulus asymptotic to 22 MPa). Owing to the water resistance of covalent bonds and metal-ligand bonds existed in gelatin matrix, the gelatin film possesses good water resistance. Additionally, after use, the fabricated film can completely biodegrade in natural soil in approximately 7 weeks. This strategy not only provides a valuable recycling solution for the gelatin from the unwelcome solid waste of the leather industry, but it also broadens the range of ecofriendly and cost effective biodegradable films available.
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