Microwave Hydrothermal Synthesis of Cr3+-doped ZnO Nanoparticles and Their Photocatalytic Properties
Abstract:Zn1-(3/2)xCrxO nanoparticles with different Cr3+ doping contents (i.e., 0, 2%, 5%, 8% and 10% in mole fraction) were synthesized with Zn(NO3)2•6H2O as Zn source and Cr(NO3)3•9H2O as Cr source materials by a microwave hydrothermal method. The phase, morphology and optical properties of the as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy and ultraviolet–visible (UV–Vis) spectroscopy, respectively. The results show that the XRD peaks of Zn1-(3/2)xCrxO nanoparticles shifted slightly toward the higher angle with the increase of Cr3+ doping content from 0% to 10%. The sheet-like Zn1-(3/2)xCrxO nanoparticles were found to transform from regular to irregular morphologies. The analysis by UV–Vis tests indicates that the Zn1-(3/2)xCrxO nanoparticles could have a high absorption in UV region and the optical band gap Eg decreases slightly. Accroding to the results by visible-light photocatalytic test, the Cr-doped ZnO has superior visible-light photocatalytic properties. The 5% Cr-doped ZnO has an optimal photocatalytic activity, and the degradation rate for Rhodamine B (RhB) is 96.4%.
Document Type: Research Article
Affiliations: Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
Publication date: December 1, 2013
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