Chengdu Campus, Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China.
Wenjiang Campus, College of Chemistry and Life Science, Chengdu Normal University, Chengdu 611130, China.
Molecules. 2022 Mar 1;27(5):1637. doi: 10.3390/molecules27051637.
The valorization of cellulose and lignin residues in an integrated biorefinery is of great significance to improve the overall economics but has been challenged by their structural recalcitrance, especially for lignin residue. In this work, a facile chemical conversion route to fabricating functional UV-blocking cellulose/lignin composite films through a facile dissolution-regeneration process using these biomass residues was proposed. Three representative lignin residues, i.e., aspen and poplar wood lignin, and corn stover (CS) lignin were assessed for their feasibility for the film fabrication. The UV-blocking performance of the composite films were comparatively investigated. Results showed that all these three lignin residues could enhance the UV-blocking property of the composite films, corresponding to the reduction in the optical energy band gap from 4.31 to 3.72 eV, while poplar lignin had a considerable content of chromophores and showed the best UV-blocking enhancement among these three assessing lignins. The enhancement of UV-blocking property was achieved without compromising the visible-light transparency, mechanical strength and thermal stability of the composite films even at 4% lignin loading. This work showed the high promise of integrating biomass residue conversion into lignocellulose biorefinery for a multi-production purpose.
在综合生物炼制厂中，对纤维素和木质素残渣进行增值利用对于提高整体经济性具有重要意义，但由于其结构的顽固性，特别是木质素残渣，这一目标一直具有挑战性。在这项工作中，提出了一种通过使用这些生物质残渣的简便溶解-再生工艺来制造具有功能性的紫外阻隔纤维素/木质素复合膜的简便化学转化途径。评估了三种有代表性的木质素残渣，即杨木和柳树木质素以及玉米秸秆（CS）木质素，以评估其用于制造薄膜的可行性。比较了复合膜的紫外阻隔性能。结果表明，所有这三种木质素残渣都可以增强复合膜的紫外阻隔性能，相应的光学能带隙从 4.31eV 降低到 3.72eV，而杨木木质素具有相当含量的生色团，在这三种评估木质素中表现出最佳的紫外阻隔增强效果。即使在 4%木质素负载下，复合膜的紫外阻隔性能的增强也不会影响其可见光透明度、机械强度和热稳定性。这项工作表明，将生物质残渣转化为木质纤维素生物炼制厂以实现多种生产目的具有很大的前景。
