Zheng Dingyuan, Zhang Yangyang, Guo Yunfeng, Yue Jinquan
College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China.
Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China.
Polymers (Basel). 2019 Jul 3;11(7):1130. doi: 10.3390/polym11071130.
Herein, walnut shell (WS) was utilized as the raw material for the production of purified cellulose. The production technique involves multiple treatments, including alkaline treatment and bleaching. Furthermore, two nanocellulose materials were derived from WS by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidation and sulfuric acid hydrolysis, demonstrating the broad applicability and value of walnuts. The micromorphologies, crystalline structures, chemical functional groups, and thermal stabilities of the nanocellulose obtained via TEMPO oxidation and sulfuric acid hydrolysis (TNC and SNC, respectively) were comprehensively characterized. The TNC exhibited an irregular block structure, whereas the SNC was rectangular in shape, with a length of 55-82 nm and a width of 49-81 nm. These observations are expected to provide insight into the potential of utilizing WSs as the raw material for preparing nanocellulose, which could address the problems of the low-valued utilization of walnuts and pollution because of unused WSs.
在此，核桃壳（WS）被用作生产纯化纤维素的原料。生产工艺涉及多种处理，包括碱处理和漂白。此外，通过2,2,6,6-四甲基哌啶-1-氧基自由基（TEMPO）氧化和硫酸水解从核桃壳中获得了两种纳米纤维素材料，证明了核桃的广泛适用性和价值。对通过TEMPO氧化和硫酸水解分别得到的纳米纤维素（分别为TNC和SNC）的微观形态、晶体结构、化学官能团和热稳定性进行了全面表征。TNC呈现出不规则块状结构，而SNC呈矩形，长度为55 - 82 nm，宽度为49 - 81 nm。这些观察结果有望为利用核桃壳作为制备纳米纤维素的原料的潜力提供见解，这可以解决核桃低价值利用以及因未使用的核桃壳造成污染的问题。
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