文献类型：期刊文献

英文题名：Metal-free oxidized carbon nitride for efficient sunlight-driven photocleavage of lignin ?-O-4 bond

作者：Li, Xiang[1,2,3,4,5,6] Wu, Ting[1,2,3,4,5] Fang, Guigan[1,2,3,4,5,8] Tian, Qingwen[1,2,3,4,5,7,9] Yang, Qiang[1,2,3,4,5]

第一作者：Li, Xiang

通信作者：Tian, QW[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China;[2]Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China;[3]Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing, Jiangsu, Peoples R China;[4]Natl Forestry & Grassland Adm, Key Lab Chem Engn Forest Prod, Nanjing 210042, Peoples R China;[5]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China;[6]Nanjing Forestry Univ, Nanjing 210037, Peoples R China;[7]Guangxi Univ, Coll Light Ind & Food Engn, Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China;[8]Shandong Huatai Paper Co Ltd, Dongying 257335, Shandong, Peoples R China;[9]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing, Peoples R China

年份：2023

卷号：617

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20230613567842);Scopus(收录号：2-s2.0-85147541733);WOS:【SCI-EXPANDED(收录号:WOS:000933291100001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (No. 2022YFC2105505) , Foundation (No.2021KF13) of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, National Natural Science Foundation of China (31890771) , and Taishan Industry Experts Programme (tscy20200213) .

语种：英文

外文关键词：Lignin; ?-O-4 bond; Selective catalysis; OOH radicals; Sunlight -driven photocatalytic

摘要：Benefitting from mild reaction conditions and good reusability, photocatalysis has industrial potential for highvalue utilization of lignin waste. Commonly used metal sulfide photocatalysts present the risk of contamination of aromatic products by heavy metal ions due to photocorrosion. Here, a metal-free oxidized g-C3N4 photocatalyst was developed to selectively cleave the beta-O-4 bond of lignin. Simple high-temperature oxidation treatment reduced carbon nitride size and scavenged the terminal NH2 groups, resulting in higher oxygen adsorption capacity and valence band potential. In the photoelectric effect, oxidized g-C3N4 exhibited lower carrier migration resistance and a longer photogenerated electron lifetime. The high oxygen adsorption and specific surface area led to a 160 % increase in superoxide radicals. Two routes for the photocatalytic cleavage beta-O-4 bond in g-C3N4 are proposed. The catalytic activity of oxidized g-C3N4 is 8.5 times higher than that of untreated g-C3N4, the selective photocleavage reactivity attributed mainly to more & BULL;OOH radicals and higher valence band potential. This work will provide a green and efficient strategy for the high-value conversion of lignin.