无机材料学报2022，Vol.37Issue(8)：865-872,中插1,9.DOI:10.15541/jim20220123
二维g-C3N4与Ag-TiO2复合光催化剂降解气态乙醛抗失活研究
Two-dimensional g-C3N4 Compositing with Ag-TiO2 as Deactivation Resistant Photocatalyst for Degradation of Gaseous Acetaldehyde
摘要
Abstract
The photocatalysts deactivation is one of the major issues, which lowers the usefulness of photocatalytic oxidation technology for the removal of low content volatile organic compounds (VOCs). Here, we carried out a series of experiments to demonstrate that the photocatalysts stability could be significantly improved via coupling the oxide base semiconductors, i.e., TiO2 with 2D materials such as graphitic carbon nitride (g-C3N4). Initially, when Ag modified TiO2 (AT) was used for the gaseous acetaldehyde degradation, a robust deactivation was observed within 60 min. The AT catalyst completely lost its activity when the reaction time was extended to 400 min. On the contrary, the g-C3N4 modified AT (CAT) showed superior photocatalytic performance and improved stability (600 min). The in-situ FT-IR, PL, and photocurrent studies suggested that the accumulation of reaction intermediates in the case of AT fundamentally caused the deactivation. However, the g-C3N4 provided excessive adsorption sites for the reaction by-products which improved the stability. Additionally, the PL and ESR studies suggested that the existence of g-C3N4 improved the charge separation and production of reactive oxygen species, which facilitated the photodegradation of acetaldehyde and ultimate reaction products. This study realizes the usefulness of 2D materials for developing stable and visible light active photocatalysts for applications in sustainable VOC abatement technology.关键词
光催化/二氧化钛/g-C3N4/抗失活/原位漫反射红外光谱Key words
photocatalysis/titanium dioxide/g-C3N4/deactivation-resistant/in-situ diffuse reflectance infrared Fourier transform spectroscopy分类
化学化工引用本文复制引用
薛虹云,王聪宇,MAHMOOD Asad,于佳君,王焱,谢晓峰,孙静..二维g-C3N4与Ag-TiO2复合光催化剂降解气态乙醛抗失活研究[J].无机材料学报,2022,37(8):865-872,中插1,9.基金项目
Key Collaborative Research Program of the Alliance of International Science Organizations(ANSO-CR-KP-2020-13) （ANSO-CR-KP-2020-13）
National Key Research and Development Program of China(2021YFE0110400) （2021YFE0110400）
National Natural Science Foundation of China(41907303,52072387) （41907303,52072387）
Shanghai Commission of Science and Technology Program(19DZ1202600,20DZ1204100) （19DZ1202600,20DZ1204100）
State Key Laboratory Director Fund of SICCAS(Y9ZC0102) （Y9ZC0102）
