文献类型：期刊文献

英文题名：Z-scheme heterojunction of low conduction band potential MnO2 and biochar-based g-C3N4 for efficient formaldehyde degradation

作者：Li, Xiang[1,2,3,4] Fang, Guigan[1,2,3,4] Qian, Xueren[5] Tian, Qingwen[1,2,3,4]

第一作者：Li, Xiang

通信作者：Fang, GG[1];Fang, GG[2];Fang, GG[3];Fang, GG[4];Qian, XR[5]

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]Natl Forestry & Grassland Adm, Jiangsu Prov Key Lab Chem Engn Forest Prod, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing 210042, Peoples R China;[4]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China;[5]Northeast Forestry Univ, Key Lab Biobased Mat Sci & Technol, Minist Educ, Harbin 150040, Peoples R China

年份：2022

卷号：428

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20212910645929);Scopus(收录号：2-s2.0-85109879358);WOS:【SCI-EXPANDED(收录号:WOS:000729164600005)】；

基金：This work was financially supported by the National Natural Science Foundation of China (31890771) and Taishan Industry Experts Pro-gramme (tscy20200213) .

语种：英文

外文关键词：Z-scheme; Singlet oxygen; VOCs; Adsorption; Visible light photocatalytic

摘要：The Z-scheme heterojunction-based photocatalyst often has excellent degradation activity for volatile organic compounds (VOCs). Herein, through unique reduction reaction, we developed a novel MnO2 photocatalyst that has a very low conduction band potential (-1.09 V), compared with those reported MnO2 in the literature. The key experimental evidence was from its XRD results showing much higher content of crystal face (110) in reference to that of standard alpha-MnO2 (No. 44-0144). Subsequently, a novel biochar/MnO2/g-C3N4 photocatalyst (C/CN/Mnx) was synthesized and displayed that the best formaldehyde degradation (91.78%) is 3.34 times that of g-C3N4 (27.51%) in air containing 0.5 mg L-1 formaldehyde at 3 h. Due to the favorable band potentials, the excited electrons of g-C3N4 combine with the holes of MnO2, thereby retaining low-potential electrons of MnO2, and these electrons from g-C3N4 and MnO2 can be effectively transferred to biochar so that their recombinations are minimized. The introduction of 5 mmol MnO2 can increase the singlet oxygen (1O2) concentration (2.78 x 1011 mm-3) of the photocatalyst by>4 times under visible light irradiation. This MnO2-based Z-scheme photocatalyst provides a platform technology for the photocatalytic degradation of VOCs.