文献类型：期刊文献

英文题名：Boosting the photocatalytic CO2 reduction activity of g-C3N4 by acid modification

作者：Li, Zhou[1];Ao, Junlang[2];Wang, Zhi[2];Huang, Zibin[1];Xu, Zhihua[3];Wu, Xiaofeng[2,4];Cheng, Zhenmin[1];Lv, Kangle[2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]South Cent Minzu Univ, Coll Resources & Environm, Key Lab Resources Convers & Pollut Control, State Ethn Affairs Commiss, Wuhan 430074, Peoples R China;[3]Jianghan Univ, Hubei Key Lab Ind Fume & Dust Pollut Control, Wuhan 430056, Peoples R China;[4]Tech Univ Darmstadt, Dept Mat & Earth Sci, Surface Sci Lab, Otto Berndt Str 3, D-64287 Darmstadt, Germany

年份：2024

卷号：338

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001176188600001)】；

基金：This work was financially supported by National Natural Science Foundation of China (51672312); Hubei Provincial Natural Science Foundation and Huangshi of China (2022CFD001); The Fundamental Research Funds for the Central Universities of South-Central Minzu University (CZP22001 & CZZ21012) and Excellent Discipline Cultivation Project by JHUN (2023XKZ027).

语种：英文

外文关键词：Graphitic carbon nitride; Photocatalytic CO 2 reduction; Phosphoric acid; Protonation; Solar fuels

摘要：Graphitic carbon nitride (g-C3N4 denoted as CN) is a typical organic polymeric semiconductor photocatalyst for CO2 reduction to produce solar fuels. In this study, the effect of phosphoric acid (H3PO4) modification on the property and photocatalytic performance of CN towards CO2 reduction was systematically studied. It was found that modification of CN with phosphoric acid (CNP photocatalyst) caused a reduced band gap width and negatively shifted conduction band (CB) potential. The photoreactivity of the optimized photocatalyst (CNP0.75) for CO production rate reaches 35.66 mu molg-1h- 1, which is 4.38 times higher than that of CN sample with a CO evolution rate of only 8.14 mu molg-1h- 1. The enhanced photoreativity of g-C3N4 towards CO2 reduction after phosphoric acid modification is ascribed to the combined effects of enhanced adsorption, stimulated charge separation and improved reduction ability of CB electrons. The positive effect of acid modification on the enhanced photocatalytic activity of CN was further observed by sulfuric acid (H2SO4) modification and hydrochloric acid (HCl) modification, suggesting the versatility of the method. The present study provides a novel way in preparation of high efficient g-C3N4 photocatalyst for CO2 conversion and utilization.