Open Access Microwave Hydrothermal Synthesis of Cr3+-doped ZnO Nanoparticles and Their Photocatalytic Properties

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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%.

Keywords: doping chromium; microwave hydrothermal method; photocatalytic property; zinc oxide

Document Type: Research Article

DOI: http://dx.doi.org/10.7521/j.issn.0454-5648.2013.12.16

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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  • Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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