不同分级溶剂对木质素光热转换性能的影响  

Effects of different solvents on photothermal conversion properties of lignin

作　　者：余静 张振宇 费林博 刘珍珍 刘涛 王清文[3,4] YU Jing;ZHANG Zhenyu;FEI Linbo;LIU Zhenzhen;LIU Tao;WANG Qingwen(College of Food Science,South China Agricultural University,Guangdong Provincial Key Laboratory of Food Quality and Safety,Guangzhou 510642,China;Dongyuan Middle School Affiliated to Liaocheng No.2 Middle School,Liaocheng 252000,China;Institute of Biomass Engineering,South China Agricultural University,Guangzhou 510642,China;College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]华南农业大学食品学院,广东省食品质量安全重点实验室,广州510642 [2]聊城二中附属东苑中学,聊城252000 [3]华南农业大学生物质工程研究院,广州510642 [4]华南农业大学材料与能源学院,广州510642

出　　处：《林业工程学报》2025年第2期72-78,共7页Journal of Forestry Engineering

基　　金：广东省自然科学基金面上项目(2023A1515012167)。

摘　　要：木质素作为一种可再生芳香族聚合物,具有绿色可再生、生物相容性好等优点,其独特的多酚分子结构使其具有光热转换能力,可以代替传统的无机或有机光热材料。然而,不同来源木质素的异质性和较宽的分子量分布对其光热转换性能存在显著影响。根据木质素在不同溶剂中的溶解度差异和绿色可持续的原则,采用无水乙醇和去离子水处理酶解木质素分级得到醇溶和醇不溶,以及水溶和水不溶4种木质素。在808 nm近红外光源的照射下,4种分级木质素光热转换效果差异明显,其中,乙醇和水分级的不溶产物光热转换性能要强于溶解性产物,特别是醇不溶木质素的最大光热温度达到151.0℃,比醇溶木质素的光热温度高41℃。通过对颜色、紫外可见吸收光谱、红外光谱、X射线光电子能谱、核磁共振氢谱和分子量等进行表征,分析了影响酶解木质素光热转换性能的因素。结果表明,共轭基团以及分子量是影响酶解木质素光热转换的关键因素,适当的溶剂分级可以有效提升其光热转换效果。本研究结果可以为进一步构建高性能木质素光热材料提供参考。Lignin is a three-dimensional network molecule formed in the growth process of plants,which is closely combined with cellulose and hemicelluloses,and it is the only renewable aromatic polymer in nature.It has the advantages of high yield,renewable,good biocompatibility,UV resistance,cheap and easy to obtain,being widely used in chemical and biomedicine industries.Its unique polyphenol molecular structure makes lignin capable of photothermal conversion,which can replace more expensive traditional photothermal materials such as precious metals,semiconductors,graphene and indocyanine green.However,the heterogeneity of lignin from different sources and wide molecular weight distribution significantly affected its photothermal conversion performance.In this study,based on the different solubility of lignin in different solvents and the principle of green and sustainability,the lignin was treated with anhydrous ethanol and deionized water to obtain alcohol-soluble and insoluble,as well as water-soluble and insoluble lignin.The same amount of graded lignin was pressed into a disc with a diameter of 1 cm.Under the irradiation of 808 nm near-infrared light source,the photothermal conversion effect of four kinds of lignin was significantly different,among which the photothermal conversion performance of insoluble products fractioned by ethanol and water was stronger than that of dissolved products,especially the lignin fractioned by anhydrous ethanol,the photothermal temperature difference was more than 41℃.The factors affecting the photothermal conversion performance of lignin were analyzed through the characterization of color,UV-Vis absorption spectrum,infrared spectrum,X-ray photoelectron spectroscopy,^(1)H NMR and molecular weight analysis.The results showed that,for the dark insoluble lignin,the UV-Vis absorption spectrum showed stronger conjugated alene bonds and aromatic ring absorption peaks.Stronger vibration absorption peaks of ester C=O double bond and aromatic ring skeleton are shown in FT-IR spectrum.The XP

关 键 词：木质素 溶剂分级 光热转换 共轭基团 分子量 

分 类 号：O636.2[理学—高分子化学]