文献类型：期刊文献

英文题名：Synergistic selective photocleavage of lignin C-C bonds by triazine-rich tubular carbon nitride and high-temperature oxidation treatment

作者：Li, Xiang[1] Zhu, Yawei[1] Fang, Guigan[2] Liang, Fangmin[1] Tian, Qingwen[1] Yang, Qiang[1]

通信作者：Liang, FM[1];Tian, QW[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Key Lab Biomass Energy & Mat,Key Lab Chem Engn For, Nanjing 210042, Jiangsu, Peoples R China;[2]Shandong Huatai Paper Co Ltd, Dongying 257335, Shandong, Peoples R China

年份：2024

卷号：330

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20234515024240);Scopus(收录号：2-s2.0-85175620737);WOS:【SCI-EXPANDED(收录号:WOS:001110731100001)】；

基金：This work was financially supported by the foundation of the National Key Research and Development Program (2022YFC2105503) " Industrial Demonstration of Key Technologies for 'Bio-Virgin Pulp' and Functionalized lignin preparation" & " Jiebangguashuai" Science and Technology Project of Yibin City (2022JB009) .

语种：英文

外文关键词：beta-O-4 bond; Superoxide radical; Lignin; Rich triazine; Metal -free photocatalyst

摘要：The key issue in lignin conversion depends on cutting the beta-O-4 linkage bonds between units while keeping the aromatic ring intact. Triazine-heptazine homopolymers of carbon nitride are more prone to break the C-beta-H bond in the beta-O-4 bond and generate the critical C-beta radical compared to the triazine or heptazine structure. Triazine-rich g-C3N4 was successfully prepared by ball milling-thermal polycondensation of melamine and cyanuric acid, which has the advantage of low cost and no desalting compared to the conventional eutectic salt method. The triazine-rich g-C3N4 has higher photocurrent density, lower photogenerated electron-transfer resistance, and less electron-hole recombination. Combined with high-temperature oxidation treatment, g-C3N4-O-Q-A5 has an excellent selective photocleavage efficiency of lignin beta-O-4 bonds, which is 340 % higher than that of untreated g-C3N4. This paper reveals that the localization of holes in the photocleavage beta-O-4 bond reaction, and the amount of superoxide radical generation are the main factors limiting the photocleavage efficiency.