Isolated Pt single atomic sites anchored on nanoporous TiO2 film for highly efficient photocatalytic degradation of low concentration toluene

Tongzhou Xu; Hong Zheng; Pengyi Zhang

doi:10.1016/j.jhazmat.2019.121746

Isolated Pt single atomic sites anchored on nanoporous TiO₂ film for highly efficient photocatalytic degradation of low concentration toluene

J Hazard Mater. 2020 Apr 15:388:121746. doi: 10.1016/j.jhazmat.2019.121746. Epub 2019 Nov 23.

Authors

Tongzhou Xu¹, Hong Zheng², Pengyi Zhang³

Affiliations

¹ Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
² Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China. Electronic address: zhengh@cugb.edu.cn.
³ State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China. Electronic address: zpy@tsinghua.edu.cn.

PMID: 31859166
DOI: 10.1016/j.jhazmat.2019.121746

Abstract

Single atom catalysts with atomically distributed active metal centers have attracted great attention owing to their maximum atom efficiency and excellent activity. Herein, we report a novel photocatalyst with isolated Pt single atomic sites anchored on nanoporous TiO₂ film prepared by a facile immersion and reduction method. HAADF-STEM, XPS, XANES and EXAFS results confirmed the anchoring of Pt single atomic sites on nanoporous TiO₂ film. The effects of immersion concentration of Pt, reduction temperature, relative humidity, inlet toluene concentration and residence time on photocatalytic degradation of low concentration toluene under UV and VUV irradiation were investigated. The results showed that the as-prepared catalyst had considerably high photocatalytic activity. The removal rate of toluene reached 45.88% under VUV irradiation when the inlet toluene concentration and residence time were 200 ppb and 0.3 s, respectively, which was 5.94 times that of pristine nanoporous TiO₂ film. The by-product ozone removal was greatly improved and the corresponding energy consumption was 0.01 kW·h/m³. While the removal rate of toluene increased with the decrease of inlet toluene concentration under UV irradiation. The Pt single atom catalyst exhibits significant potential for photocatalytic degradation of low concentration VOCs in indoor environments.

Keywords: Nanopores; Photocatalysis; Pt single atom; TiO(2) film modification; Trace VOCs.