文献类型：期刊文献

英文题名：Reduction of the photogenerated electron transport path by modulating the conduction band region to achieve the highest lignin β- O-4 bond photocleavage efficiency under xenon excitation

作者：Li, Xiang[1,2,3,4] Wu, Ting[1,2,3,4] Zhu, Yawei[1,2,3,4] Tian, Qingwen[1,2,3,4] Yang, Qiang[1,2,3,4] Fang, Guigan[1,2,3,4,5]

第一作者：Li, Xiang

通信作者：Wu, T[1];Fang, GG[1];Wu, T[2];Fang, GG[2];Wu, T[3];Fang, GG[3];Wu, T[4];Fang, GG[4];Fang, GG[5]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China;[2]Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing 210042, Jiangsu, Peoples R China;[3]Natl Forestry & Grassland Adm, Key Lab Chem Engn Forest Prod, Nanjing 210042, Peoples R China;[4]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China;[5]Shandong Huatai Paper Co Ltd, Dongying 257335, Shandong, Peoples R China

年份：2025

卷号：354

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20243216837641);Scopus(收录号：2-s2.0-85200583178);WOS:【SCI-EXPANDED(收录号:WOS:001292607400001)】；

基金：This work was supported by the Forestry Science and Technology Project of Zhejiang Provincial Academy Co-operation (2024SY06) , the National Key Research and Development Program of China (2023YFD2201902) , "Jie bang gua shuai" Science and Technology Project of Yibin City (2022JB009) and "Jie bang gua shuai" Project of Chenzhou National Sustainable Development Agenda Innovation Demonstration Zone Provincial Special Programme (2022sfq56) .

语种：英文

外文关键词：Nitrogen vacancy; C-C bond breakage; Carbon nitride; Superoxide radical; Oxygen chemical adsorption

摘要：Photocracking of lignin beta-O-4 bonds is a green approach for the high-value modification of lignin. Graphitic carbon nitride (g-C3N4) 3 N 4 ) that can photocleave the beta-O-4 bond is presently the only stable, metal-free photo- catalyst owing to the residual metal ions generated due to photocorrosion of metal sulfides. Herein, g-C3N4 3 N 4 with a N-C3 3 vacancy structure is prepared by etching site-engineering strategy based on the protection of C-N=C =C structure by chlorine atom. The N-C3 3 vacancy structure can reduce the transport path of the photogenerated electrons by tuning the conduction band (CB) region to the edge of the photocatalyst, which impedes the critical complexation of the photogenerated electron-hole pairs and enhances the photoelectric conversion efficiency five-fold. Combined with the unique chemisorption capacity (137.82 kJ/mol) of N-C3 3 vacancies for oxygen, the g-C3N4 3 N 4 photocatalysts with N-C3 3 vacancy structure can generate 9.6-fold higher superoxide radicals and 13-fold higher lignin beta-O-4 bond photocleavage efficiency lignin compared with untreated g-C3N4. 3 N 4 . Based on the reaction enthalpy changes and free energies investigated through simulations, a route of lignin C alpha-C beta alpha -C beta bonds being oxidized and dehydrogenated twice by photogenerated cavities is proposed for the first time. This work reveals the relation between the properties of g-C3N4 3 N 4 and the photocleavage efficiency of lignin beta-O-4 bonds.