| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Research Progress on Photocatalytic Depolymerization of Lignin and Its Model Compounds |
| TANG Ruixin1,2, ZHU Ziqi1,2, WANG Ling1,2, YANG Pei1,2,*, ZHOU Xiaoyan1,2,*
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1 Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources of Nanjing Forestry University, Nanjing 210037, China
2 School of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China |
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Abstract Since lignin is the only renewable biopolymer that has abundant aromatic ring structure in nature, the depolymerization of lignin can provide raw materials for high value-added platform compounds and fine chemicals to relieve the security of fossil energy and the derivative environmental concerns. However, it is difficult to depolymerize lignin into monomeric phenols based on retaining the free phenolic hydroxyl groups and alcohol hydroxyl groups due to the complexity, recalcitrance and low chemical reactivity of lignin itself. Recently, photocatalysis has become a sustainable and fascinated paradigm for the high-quality conversion of lignin because of its ability to accurately cleave the C-O and C-C bonds of lignin and its model compounds under mild conditions. Herein, both homogeneous and heterogeneous photocatalysts were introduced and discussed about how to increase their photocatalytic performances by elemental doping and defect design. This review also analyzed the reaction pathways and mechanisms involved in the process of lignin depolymerization. In addition, the suitability and rationality of different reaction devices were evaluated in a comparative manner, especially in the efficiency and selectivity of photocatalytic depolymerization. Finally, the existing problems and feasible solutions in terms of this strategy were proposed, which may provide the basis and reference for the high-valued green transformation of lignin biomass.
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Published: 15 August 2025
Online: 2025-08-15
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2025, Vol. 39 
