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Preparation of Zn1–xMnxO nanoparticles by a simple “green” method and photocatalytic activity under visible light irradiation

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Veröffentlicht/Copyright: 11. Juni 2013
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Abstract

A simple “green” method was applied for preparation of Zn1 –xMnxO nanoparticles (x = 0, 0.025, 0.05, 0.075, 0.15 and 0.20) in water by refluxing for 2 h at about 90 °C. This method is mild and highly efficient involving no templates, surfactants or additives; therefore, it is very promising for low-cost and large-scale production. Powder X-ray diffraction patterns demonstrate that the nanoparticles have the same crystal structure, and loading of Mn2+ ions does not change the structure of ZnO. Scanning electron microscopy images show that the nanoparticles are mainly spherical. UV-Vis diffuse reflectance spectra of the samples demonstrate increasing visible light absorption with mole fraction of Mn2+ ions. Photocatalytic degradation of methylene blue on the nanoparticles was evaluated under visible light irradiation. Among the prepared nanoparticles, Zn0.95Mn0.05O has the highest photocatalytic activity. Moreover, effects of refluxing time and calcination temperature on photocatalytic activity were investigated.


* Correspondence address, Dr. Aziz Habibi-Yangjeh, Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran, Tel.: +98 451 551 4701, Fax: +98 451 551 4702, E-mail:

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Received: 2010-09-18
Accepted: 2011-08-31
Published Online: 2013-06-11
Published in Print: 2011-11-01

© 2011, Carl Hanser Verlag, München

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