文献类型：期刊文献

英文题名：Metal-Free Oxidized Carbon Nitride for Efficient Sunlight-Driven Photocleavage of Lignin Β-O-4 Bond

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

第一作者：Li, Xiang

机构：[1] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. Of Biomass Energy and Material, Jiangsu Province, China; [2] Co-Innovation Center of Efficient Processing, Utilization of Forest Resource, Jiangsu Province, China; [3] Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, 210042, China; [4] Nanjing Forestry University, Nanjing, 210037, China; [5] Shandong Huatai Paper Co., Ltd., Shandong Province, Dongying, 257335, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220411651)

语种：英文

外文关键词：Carbon nitride - Catalyst activity - Gas adsorption - Heavy metals - Light absorption - Lignin - Oxygen - Photocatalytic activity - Photoelectricity - Reusability - Sulfur compounds - Thermooxidation - Valence bands

摘要：Due to mild reaction conditions and good reusability, photocatalysis has the potential for industrialization of high-value 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 is developed to selectively cleave the β-O-4 bond of lignin. The simple high-temperature oxidation treatment reduces the carbon nitride size and scavenges the terminal NH2 groups, resulting in higher oxygen adsorption capacity and valence band potential. In the photoelectric effect, the oxidized g-C3N4 exhibited smaller carrier migration resistance. The high oxygen adsorption and specific surface area led to a 160% increase in superoxide radicals. Two routes for the photocatalytic cleavage β-O-4 bond in g-C3N4 were proposed. The catalytic activity of oxidized g-C3N4 is 8.5 times higher than that of untreated g-C3N4, the selective photocleavage reactivity was mainly attributed to more ?OOH radicals and higher valence band potential. This work will provide a green and efficient strategy for the high-value conversion of lignin. ? 2022, The Authors. All rights reserved.