期刊
CHEMICAL ENGINEERING JOURNAL
卷 351, 期 -, 页码 1056-1066出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.06.171
关键词
Advanced oxidation; Norfloxacin; Photocatalytic degradation; Visible light; Z-scheme Ag/FeTiO3/Ag/BiFeO3
资金
- National Natural Science Foundation of China [21371084, 41771503]
- Science Research Plan Project of Education Department of Liaoning Province of China [L2015205]
- Natural Science Foundation of Science and Technology Department of Liaoning Province of China [201602346]
- Shenyang Municipal Science and Technology Plan Project of China [F16-205-1-06]
- Environmental Science Key Discipline Project of Liaoning Province Education Department and Liaoning University of China
- University of Cincinnati through a UNESCO
- Herman Schneider Professorship in the College of Engineering and Applied Sciences
A novel Z-scheme Ag/FeTiO3/Ag/BiFeO3 with excellent visible-light-driven photocatalytic performance was constructed using sol-gel method followed by a photo-reduction process, and applied in the photocatalytic degradation of norfloxacin (NFX) in solution under visible light irradiation. The photocatalytic activities of Ag/FeTiO3/Ag/BiFeO3 and FeTiO3/BiFeO3 nanocomposites were compared. The effects of wt% content of Ag, the mass ratio (FeTiO3:BiFeO3), and light irradiation time on the photocatalytic activities were assessed. The mechanism on Z-scheme Ag/FeTiO3/Ag/BiFeO3 photocatalytic degradation was also proposed. The results show that Ag/FeTiO3/Ag/BiFeO3 has higher photocatalytic activity than FeTiO3/BiFeO3, and the loading of Ag improves the photocatalytic activity of catalysts. The photocatalytic degradation extent reaches 96.5% within 150 min, when using Ag/FeTiO3/Ag/BiFeO3 at 2.0 wt% Ag (FeTiO3:BiFeO3 = 1.0:0.5). In addition, Ag/FeTiO3/Ag/BiFeO3 can be reused with excellent photocatalytic stability. The study reveals that the active species such as hydroxyl radicals (center dot OH), holes (h(+)) and superoxide radicals (center dot O-2(-)) are generated during the photocatalytic process using Ag/FeTiO3/Ag/BiFeO3. These results on the enhanced photocatalytic activity are attributed to the synergistic photocatalytic effects of FeTiO3 and BiFeO3 with narrow band gaps mediated by Ag. Hence, the Zscheme Ag/FeTiO3/Ag/BiFeO3 photocatalytic system demonstrates great promise in treating antibiotics in water and wastewater using solar energy.
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