Synthesis and Photocatalytic Evaluation of Nanocrystalline ZnO Obtained by High Energy Milling

Abstract:

Photocatalytic processes have been applied to treatment of organic effluents through the mineralization of these pollutants on a semiconductor surface. Obtaining nanosemiconductors is desirable for the increasing of particle surface area and improvement in photocatalytic efficiency. In this paper, it was evaluated the influence of High Energy Milling (HEM) as a technique to produce nanocrystalline zinc oxide. The photocatalytic activity of the milled powders to degrade Rhodamine-B dye when exposed to ultraviolet and visible radiation also was investigated. The powders were milled during 4 and 10 hours by dry media milling and 10 hours by wet media milling. The results indicated that there were no detectable powder contamination during the millings and the reduction of crystallite size was function of time and media of milling. All of the assessed samples demonstrate high degradation of the dye, which corroborates with the potentiality of this technique to photocatalysts production. The material milled during 10 hours by dry media milling showed the best results under the experimental conditions.

• Periodical: Materials Science Forum (Volume 869)
• Pages: 789-794
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.869.789
• Online since: August 2016
• Authors: Jeferson Almeida Dias*, Vera Lúcia Arantes, Alfeu Saraiva Ramos, Tania Regina Giraldi, Marília Zani Minucci, Mauro F. Toledo, Sylma Carvalho Maestrelli
• Keywords: Dye, Mechanosynthesis, Nanotechnology, Semiconductor

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