期刊
CHEMICAL ENGINEERING JOURNAL
卷 160, 期 1, 页码 33-41出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.02.054
关键词
Photocatalytic; La2O3/Ag3VO4; Visible light irradiation; Degradation intermediates
资金
- Doctoral Innovation Fund of Jiangsu [CX08B-142Z]
- National Nature Science Foundation of China [20876071, 20676057, 20871061]
La2O3/Ag3VO4 samples were synthesized by impregnation process and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The XRD, SEM-EDS and XPS analyses revealed that La3+ was dispersed on Ag3VO4 in the form of La2O3 cluster. The DRS results indicated that the absorption edge of the La3+-Ag3VO4 catalyst shifted to longer wavelength. The enhanced photocatalytic activity of La2O3/Ag3VO4 for Rhodamine B (RhB) dye degradation under visible light irradiation was due to its wider absorption edge and higher separation rate of photo-generated electron and holes. The highest photodegradation efficiency was obtained when the La2O3/Ag3VO4 catalyst was calcined at 300 degrees C with 3 wt% La content. The photocatalytic degradation intermediates of the solution were identified by LC/MS. (C) 2010 Elsevier B.V. All rights reserved.
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