One-step fabrication of mesoporous sulfur-doped carbon nitride for highly selective photocatalytic transformation of native lignin to monophenolic compounds  

作　　者：Conghao Ku Huiqin Guo Kexin Li Qiong Wu Liushui Yan 

机构地区：[1]Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle,Nanchang Hangkong University,Nanchang 330063,China [2]National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource utilization,Nanchang Hangkong University,Nanchang 330063,China [3]Jiangxi Provincial Experimental Teaching Demonstration Center of Environmental Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China

出　　处：《Chinese Chemical Letters》2023年第1期440-445,共6页中国化学快报（英文版）

基　　金：finacially supported by the National Natural Science Foundation of China(Nos.21966023,21665018 and 51568049);the Natural Science Foundation of Jiangxi Province,China(No.20171ACB21035);Jiangxi Province Graduate Student Innovation Special Fund(No.YC2020-S513)。

摘　　要：Photocatalytic selective transform native lignin into valuable chemicals is an attractive but challenging task.Herein,we report a mesoporous sulfur-doped carbon nitride(MSCN-0.5)which is prepared by a facile one-step thermal condensation strategy.It is highly active and selective for the cleavage Cα-Cβbond inβ-O-4 lignin model compound under visible light radiation at room temperature,achieving 99%substrate conversion and 98%Cα-Cβbond cleavage selectivity.Mechanistic studies revealed that the Cβ-H bond of lignin model compounds activated by holes and generate key Cβradical intermediates,further induced the Cα-Cβbond cleavage by superoxide anion radicals(·O2-)to produce aromatic oxygenates.Waste Camellia oleifera shell(WCOS)was taken as a representative to further understand the reaction mechanisms on native lignin.33.2 mg of monophenolic compounds(Vanillin accounted for 22%and Syringaldehyde for 34%)can be obtained by each gram of WCOS lignin,which is 2.5 times as that of the pristine carbon nitride.The present work offers useful guidance for designing metal-free heterogeneous photocatalysts for Cα-Cβbond cleavage to harvest monophenolic compounds.

关 键 词：MESOSTRUCTURE Sulfur-doped carbon nitride Photocatalysis Lignin model compound Native lignin Monophenolic compounds 

分 类 号：TQ426[化学工程]