Estudo da Variação do Tempo de Síntese e  Potencial Fotocatalítico de Nanoparticulas de ZnO  Obtido pelo Método Hidrotermal-Micro-Ondas

Tania R.  Giraldi; Khasmira  K. A. T. A.  Silva; José S.  B.  Junior

doi:10.19142/rpq.v18i32.667

Tania R. Giraldi Universidade Federal de Alfenas - UNIFAL-MG
Khasmira K. A. T. A. Silva Universidade Federal de Alfenas - UNIFAL-MG
José S. B. Junior Universidade Federal de Alfenas - UNIFAL-MG

DOI: https://doi.org/10.19142/rpq.v18i32.667

Keywords: microwave, ZnO, photocatalysis, nanoparticles

Abstract

ZnO nanoparticles were synthesized by microwave synthesis, with a time of 10 to 30 minutes. The nanoparticles presented a wurtzite phase, with residues of synthesis on the surface. By crystallite size results, it is assumed that the nucleation was complete in 10 minutes of synthesis, and the growth was more accentuated in 30 minutes, time that presented smaller amount of residues. Photocatalytic essays with the dye Rhodamine-B indicate that the best results were obtained with nanoparticles synthesized from 10 to 25 minutes. It is believed that the species adsorbed on the nanoparticle’s surface was a facilitator in the generation of free radicals.

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