Sustainable, biodegradable, and recyclable bioplastics derived from renewable carboxymethyl cellulose and waste walnut shell

文献类型： 外文期刊

第一作者： Qian, Yangyang

作者： Qian, Yangyang;Qin, Changpei;Zhang, Jianqiang;Shi, Bingfei;Wei, Yuan;Niu, Jingchao;Kang, Shimin;Wang, Chunyu;Chen, Gang;Qian, Yangyang;Wei, Yuan;Liu, Yijun

作者机构：

关键词： Carboxymethyl cellulose; Waste walnut shell; One-pot casting; Bioplastics; UV-blocking

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2025 年 299 卷

页码：

收录情况： SCI

摘要： Manufacturing water-stable carboxymethyl cellulose (CMC) films as an alternative to commercial plastics is a promising solution to address plastic pollution. In this study, waste walnut shell (WS) was used as a natural lignocellulosic filler, glycerol as a plasticizer, and citric acid (CA) as a crosslinking agent for preparing highperformance CMC-based bioplastics through a one-pot casting method. When WS content was 12 wt%, the obtained CWGA-12 after optimization exhibited excellent mechanical properties (tensile strength approximate to 18.53 MPa, fracture strain approximate to 78.11 %), low surface roughness (< 16 nm), high optical transmittance (82.23 %), and superior thermal stability. Moreover, CWGA-12 could not decompose within 7 days of immersion in water, or even after 5 h of continuous stirring at 60 degrees C, while it could be reused after crushing, dissolving, and re-pouring under alkaline conditions. The alkali-recycled CWGA-12 exhibited a better UV-blocking capacity than before (99.22 % for UVA and 99.95 % for UVB). In addition, our bioplastic also had excellent biodegradability and disappeared completely after 2 days in rainy weather. Thus, our work not only offers an innovative approach to producing petroleum-based plastic substitutes with outstanding water resistance and UV-blocking properties but also paves the way for WS waste's broader applications.

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