期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 203, 期 -, 页码 964-978出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.11.008
关键词
3D Ag3PO4/TiO2@MoS2; Anti-photocorrosion; Visible-light photocatalytic degradation; Dyes; Antibiotics
资金
- Water Resource Project of Jiangsu Province [2016039]
- Integration of Industry and UniversityResearch Funds of Jiangsu Province [BY2015060-2]
- Environmental Protection Research Funds of Jiangsu Province [2015010]
- Major Program of National Natural Science fundation of China [51438008]
We synthesized novel three-dimensional photocatalyst-(Ag3PO4/TiO2@MoS2) with various content of TiO2@MoS2 by electrospining, sequential hydrothermal reaction and chemical deposition. The optimal content of TiO2@MoS2 in Ag3PO4/TiO2@MoS2 composites is 3.5 wt%, and the bandgap of Ag3PO4/TiO2@MoS2 (3.5 wt%) (1.85 eV) was much lower than that of pure Ag3PO4 (2.45 eV). Due to high conductivity of TiO2@MoS2 heterostructure, the separation efficiency of electron-hole pairs of Ag3PO4 was significantly improved so that Ag3PO4/TiO2@MoS2 (3.5 wt%) presented higher photocatalytic activity. More than 92% Methyl orange and Methylene blue were photodegraded over Ag3PO4/TiO2@MoS2 (3.5 wt%) in 12 min and 5 min, respectively. More importantly,TiO2@MoS2 could play the role of 'wire' to guide electrons captured by MoS2 and quickly transferred electrons into solution so that the recombination of electron-hole pairs and the reduction of silver irons were effectively restrained. Thus, Ag3PO4/TiO2@MoS2 (3.5 wt%) exhibited excellent anti-photocorrosion performance. Even after 10 cycling runs, Ag3PO4/TiO2@MoS2 (3.5 wt%) could degrade 75% and 92% of oxytetracycline and enrofloxacin, respectively, whereas Ag3PO4 degraded 23% and 44%. In addition, the possible photodegradation pathways of oxytetracycline and enrofloxacin were proposed, demonstrating that the photodegradation mechanisms involving oxidizing/shedding of functional groups firstly and opening the ring sequentially. Further detection of reactive oxidative species indicated that holes were the main active oxidizing species involved in the photocatalytic reaction process. Thus, Ag3PO4/TiO2@MoS2(3.5 wt%) is a promising photocatalyst for photodegradation of organic pollutants in the environmental protection. (C) 2016 Elsevier B.V. All rights reserved.
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