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Construction of CeO2/TiO2 heterojunctions immobilized on activated carbon fiber and its synergetic effect between adsorption and photodegradation for toluene removal

Authors
  • Li, Yuwei1
  • Li, Wei1
  • Liu, Fang1, 2
  • Li, Meng1
  • Qi, Xuejin1
  • Xue, Ming2
  • Wang, Yongqiang1, 2
  • Han, Fenglei1, 2
  • 1 China University of Petroleum, Qingdao, 266580, People’s Republic of China , Qingdao (China)
  • 2 State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, People’s Republic of China , Beijing (China)
Type
Published Article
Journal
Journal of Nanoparticle Research
Publisher
Springer-Verlag
Publication Date
May 15, 2020
Volume
22
Issue
5
Identifiers
DOI: 10.1007/s11051-020-04860-4
Source
Springer Nature
Keywords
License
Yellow

Abstract

Toluene, as one of the most representative volatile organic compounds (VOCs), poses a serious threat to the atmospheric environment and human health. Herein, cerium dioxide (CeO2)/TiO2 immobilized on activated carbon fiber (ACF) is fabricated by ultrasonic-assisted sol-gel impregnation method for toluene removal. Characterizations of CeO2/TiO2/ACF composites reveal that CeO2 disperses or covers the surface of TiO2/ACF, and Ce4+ does not enter the lattice of TiO2 to replace Ti4+. The TEM and UV-vis analysis indicate the formation of heterojunction between TiO2 and CeO2. The Ce4+/Ce3+ redox centers significantly boost the separation efficiency of electron-hole pairs. The maximum removal efficiency of 1.5% CeO2/TiO2/ACF can reach up to 90%, much higher than 54% over TiO2/ACF. The CeO2/TiO2/ACF composites exhibit high removal efficiency of toluene due to the synergetic effects between adsorption and photodegradation. The gas-phase photodegradations are benzene, benzaldehyde, hexane, phenol, O-xylene, and phenylethyl acetate. Graphical abstractCeO2/TiO2 heterojunctions immobilized on ACF achieve the perfect combination of adsorption and photocatalysis, and greatly improve the removal efficiency of dynamic toluene.

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