期刊
APPLIED SURFACE SCIENCE
卷 447, 期 -, 页码 191-199出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.03.183
关键词
C-coated MnO2; Visible light; Room-temperature; Toluene degradation
类别
资金
- National Natural Science Foundation of China - China [21606051, 21576054, 51678160]
- Scientific Project of Guangdong Province [2016B020241003, 2016A020221033]
- Foundation of Higher Education of Guangdong Province [2013CXZDA016]
This work mainly focuses on exploring carbon coated epsilon-MnO2 (epsilon-MnO2/C) with 3D hierarchical structures for degradation of gaseous toluene under visible light. Influence of C-coating on surface adsorption, visible-light activity and photocatalytic activities of C-coated MnO2 have been investigated. The results indicate that the C-coating behave as the adsorption and electron-transfer system, and the resulting C-coated epsilon-MnO2 could extend the optical response from UV to visible light region, which can generate more electron - hole pairs. The photocatalyst epsilon-MnO2/0.45C exhibited excellent visible-light photocatalytic activities, with degradation rate of toluene up to 87.34% in 70 min, but no photocatalytic activity could be observed for the pure epsilon-MnO2. The PL spectra and photocurrent response results indicate that the composite structure can not only enhance the utilization of visible light but also consequently reduce electron (e(-))-hole (h(+)) pair recombination, which improve the photocatalytic efficiency of the composite photocatalyst. This work provides a facile and economic approach for fabricating photocatalysts with high efficiency for degradation of VOCs under visible light at room temperature. (C) 2018 Elsevier B.V. All rights reserved.
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