林业工程学报2025，Vol.10Issue(2)：72-78,7.DOI:10.13360/j.issn.2096-1359.202401034
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
摘要
Abstract
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,1H 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 double bond and aromatic ring skeleton are shown in FT-IR spectrum.The XPS spectrum showed a stronger area of C double bond binding energy curve.More aromatic ring and α-vinyl structure contents were found at 1H NMR.A larger molecular weight distribution was displayed in the GPC test.In other words,conjugated groups and molecular weight are the key factors affecting the photothermal conversion of lignin,and appropriate solvent classification can effectively improve the photothermal conversion effect.The findings of this study can serve as a reference for further development of high-performance lignin photothermal materials.关键词
木质素/溶剂分级/光热转换/共轭基团/分子量Key words
lignin/solvent fractionation/photothermal conversion/conjugate group/molecular weight分类
化学引用本文复制引用
余静,张振宇,费林博,刘珍珍,刘涛,王清文..不同分级溶剂对木质素光热转换性能的影响[J].林业工程学报,2025,10(2):72-78,7.基金项目
广东省自然科学基金面上项目(2023A1515012167). （2023A1515012167）
