光催化
木质素
键裂
光化学
单体
化学
激进的
合理设计
石墨氮化碳
催化作用
材料科学
化学工程
有机化学
纳米技术
聚合物
工程类
作者
Mengyu Cao,Shibo Shao,W. Wei,Jason B. Love,Zhufeng Yue,Y. Zhang,Xiaolei Zhang,Yuxiang Xue,Jialin Yu,Xianfeng Fan
标识
DOI:10.1016/j.apsusc.2023.158653
摘要
Lignin depolymerisation via photocatalytic cleavage of the selective interunit linkage in lignin could be a sustainable approach to produce monomeric aromatic chemicals. However, the insufficient investigation of interunit C–C bond fragmentation has obstructed the rational design of efficient photocatalytic system and further limit the yields of aromatic monomers from lignin depolymerisation. Herein, this work developed the ultrathin g-C3N4 with multiple defective sites by simple self-assembly process and in-situ thermal gas-shocking/etching process to catalyse the cleavage of lignin C–C bonds under visible light irradiation. Compared with the pristine g-C3N4, the developed g-C3N4 photocatalyst exhibited a superior catalytic activity (improved 102 %) and selectivity (∼90 %) in the cleavage of C–C bonds in lignin. This study demonstrated that the defects construction and ultrathin structure can optimise the electronic structures of g-C3N4 for better separation and transfer of photoinduced charges. And the control experiments and DFT calculation indicated that the created defect sites can promote the generation of essential reactive radicals (e.g., the activation of O2) and radical intermediates (C–H activation). The present work provides useful insights for the rational use of defect engineering in design the efficient photocatalytic system for the conversion of lignin into aromatic monomers via the C–C bond cleavage.
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