文献类型：期刊文献

英文题名：S-scheme TiO2@Co3O4 heterojunction derived from MIL-125@ZIF-67 with excellent photothermocatalytic activity for toluene degradation under broadband excitation

作者：Chi, Zhili[1];Yang, Hongxia[1];Li, Nan[1];Liu, Chaofan[1];Ye, Ziwei[1];Zhang, Jinlong[1];Tian, Baozhu[1]

机构：[1]East China Univ Sci & Technol, Engn Sch Chem & Mol Engn, State key Lab green Chem Engn & Ind catalysis, Shanghai Engn Res Ctr Multimedia Environm Catalysi, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2025

卷号：13

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20252918811939);WOS:【SCI-EXPANDED(收录号:WOS:001517783900007)】；

基金：This research was funded by the Shanghai Industrial Collaborative Innovation Project (XTCX-KJ-2022-2-01) , Shanghai Pujiang Program (23PJ1401900) , the Science and Technology Commission of Shanghai Municipality (22230780200, 20DZ2250400) , National Natural Science Foundation of China (U1862112) , and Fundamental Research Funds for the Central Universities (JKD01241701, 222201717003, 50321042017001) .

语种：英文

外文关键词：MOF-derived structure; MIL-125@ZIF-67; Photothermocatalysis; Toluene degradation; S -scheme heterojunction

摘要：Photothermocatalysis has emerged as a promising technology for addressing volatile organic compound (VOC) pollution. In this work, we successfully synthesized a core@shell structured S-scheme TiO2@Co3O4 heterojunction through controlled calcination of the MIL-125@ZIF-67 precursor. The as-synthesized TiO2@Co3O4 catalyst demonstrated exceptional toluene degradation performance under full-spectrum solar irradiation, which can be attributed to its superior photothermal conversion efficiency, high specific surface area, and optimized Sscheme structure. Remarkably, the catalyst achieved a 95.7 % toluene degradation rate within 40 min of illumination, with a corresponding rate constant of 0.0391 min-1. This performance represents a 24.3-fold and 5.5-fold enhancement compared to pristine TiO2 and Co3O4, respectively. The reaction mechanism was investigated using a combination of techniques including ESR, radical trapping, 18O2 isotope labeling, GC-MS, H2-TPR and in-situ DRIFTS, which showed that this excellent activity was a result of the synergy between photocatalysis and thermocatalysis. Specifically, the active species produced in the photocatalytic reaction not only activated toluene but also accelerated the replenishment of oxygen vacancies in Co3O4. On the other hand, the porous structure and high specific surface area of TiO2@Co3O4 also contributed to enhancement of the catalytic activity by promoting the adsorption of reactants, providing more reactive sites, and improving the absorption of the incoming light.