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    • Synergistic Action of Photocatalytic Oxidation and Alkaline Degumming of Hemp Fibres under Simulated Sunlight

    Zhihao Cao,Tao Zhao,Xiaoli Yang,Wei Jiang,Kai Nie,Wenying Xia,Xin Wang,Lingyu Wang,Chengfeng Zhou,Yuanming Zhang,Guangting Han,Haoxi Ben

    INDUSTRIAL CROPS AND PRODUCTS（2024）

    Qingdao Univ

    Cited 1|Views31
    Abstract
    Efficient degumming is crucial for valorisation of bast fibres. However, severer conditions and high energy consumption hinder their practical application. This work developed a photocatalytic degumming method assisted by both ZnIn2S4 catalysis and lignin autocatalysis at mild conditions. The method achieved high lignin removal rate (71.6%) and cellulose yield (94.8%) in degumming of hemp fibres, decreasing the major content of β-O-4 bond and β-β bond in lignin from 32.0% to 10.7% and 6.8% to 3.4%, respectively. The pretreated fibres possessed excellent breaking strength (4.46 cN/dtex) and fineness (6.83 dtex). Moreover, the pretreated fibres were readily hydrolysed by cellulase, improving the glucose concentration by 58.3% compared to the alkaline degumming. Furthermore, the synergistic action of ZnIn2S4 and lignin on generation of free radicals was observed. Thus, this work explored the potential of photocatalysis degumming of bast fibres, and discovered the synergistic action of ZnIn2S4 and lignin autocatalysis.
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    Key words
    Degumming,Photocatalysis,Lignin,Bast fibre,Enzymatic hydrolysis
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    【要点】：该研究开发了一种在温和条件下利用ZnIn2S4催化和木质素自催化协同作用的 photocatalytic degumming 方法，有效去除非纤维素物质，提高了麻纤维的价值化效率。
    

    【方法】：研究采用了一种结合光催化氧化和碱性脱胶的方法。
    

    【实验】：在模拟太阳光下，使用ZnIn2S4作为催化剂，对麻纤维进行处理。结果显示，这种方法在温和条件下，去除了71.6%的木质素，并获得了94.8%的纤维素产量，相比传统碱性脱胶方法，葡萄糖浓度提高了58.3%。这一过程还显著提高了麻纤维的断裂强度和细度，并且观察到了ZnIn2S4和木质素在产生自由基方面的协同作用。