Electro-depolymerization of Kraft lignin with deep eutectic solvents

IF 3.1 2区农林科学 Q1 FORESTRY

Wood Science and Technology Pub Date : 2024-07-31 DOI:10.1007/s00226-024-01582-x

Esra Ceylan, Berrin Gürler-Akyüz, Rıfat Kurt, Ayhan Gencer, Mehmet Akyüz, Ayben Kilic-Pekgözlü

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Abstract

The paper production industry annually produces approximately 50 million tons of lignin, an intermediate product. While lignin has the potential for producing valuable chemicals and energy materials, an effective method for its conversion is yet to be developed. This study aims to establish a sustainable and environmentally friendly approach for electrochemically synthesizing valuable compounds from lignin with using natural deep eutectic solvents as electrolytes. The study used cyclic voltammetry (CV) for the electrochemical depolymerization of Kraft lignin, examining the effects of different scan numbers on depolymerization and the resulting lignin derivatives. Observed changes in the depolymerization peak current of lignin were reported as the number of scans increased. Choline chloride: Lactic acid (CC:LA), Choline chloride: Ethylene glycol (CC:EG), and Lactic acid:1,2-propanediol (LA:PR) were used as green electrolytes. Syringaldehyde was found to be the major compound obtained by this method. As a result of statistical analysis performed using The Grey Relations Analysis method, it was determined that the conditions that utilized Kraft lignin with the highest added value involved performing five cycles of CV scans with the CC:LA electrolyte. CV scans in DES environments increased the yield of lignin-derived phenolic compounds.

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用深共晶溶剂电解牛皮纸木质素

造纸业每年生产约 5000 万吨木质素（一种中间产品）。虽然木质素具有生产有价值化学品和能源材料的潜力，但目前尚未开发出有效的木质素转化方法。本研究旨在利用天然深共晶溶剂作为电解质，建立一种从木质素中电化学合成有价值化合物的可持续且环保的方法。研究采用循环伏安法（CV）对牛皮纸木质素进行电化学解聚，考察了不同扫描数对解聚和所产生的木质素衍生物的影响。随着扫描次数的增加，木质素的解聚峰电流也发生了变化。氯化胆碱乳酸 (CC:LA)、氯化胆碱乙二醇（CC:EG）和乳酸:1,2-丙二醇（LA:PR）用作绿色电解质。发现丁香醛是该方法获得的主要化合物。使用灰色关系分析法进行统计分析的结果表明，利用牛皮纸木质素附加值最高的条件是使用 CC:LA 电解质进行五个循环的 CV 扫描。在 DES 环境中进行 CV 扫描可提高木质素衍生酚类化合物的产量。

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来源期刊

Wood Science and Technology 工程技术-材料科学：纸与木材

CiteScore

5.90

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.