STUDY OF TiO2 NANOPARTICLES OBTAINED BY HIGH ENERGY MILLING FOR PHOTOCATALYSIS APPLICATION

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Abstract
06-028 Vanessa Vilela Lemos Lemos, V.V.(Universidade Federal de Alfenas); Storion, A.G.(Universidade Federal de Alfenas); PAIVA, G.(Universidade Federal de Alfenas); Giraldi, T.R.(Universidade Federal de Alfenas); Pallone, E.M.(Faculdade de Zootecnia e Engenharia de Alimentos - FZEA); Maestrelli, S.C.(Universidade Federal de Alfenas-campus de Poços de Caldas); Several studies with nanoscale materials have been developed recently, given the important applications in this area. When in nanometric proportions, the materials have a large surface area, and for this reason they show different and often optimized properties when compared to those in micrometric scale. The application of semiconductor nanopowders in heterogeneous photocatalysis has been an important line of research, which aims to oxidize organic compounds to inert and less toxic forms, reducing the environmental impacts caused by their disposal. Titanium Oxide or Titania (TiO2) has been used in this process as a semiconductor. In this context, the present project aimed to obtain a TiO2 nanopowder through high energy milling, using a SPEX mill, as an alternative of lower cost when compared to the chemical routes, normally used for the production of nanopowders for application in photocatalysis. Samples of commercial TiO2, in the form of powders, were milled in a SPEX high energy mill, varying the milling times (1, 2, 3, 4 and 5h), in order to study the influence of this variable to obtain nanoparticles. After milling, each powder obtained for the different times investigated was divided into two batches, where acidic leaching was made in one of the batches. The leaching process was applied aiming the decontamination caused by the iron released in the sample by the mill and milling spheres. The powders obtained, in nanometric scale, were then characterized by XRD and the size of the crystallites was determined by the Rietveld method. Photocatalysis measurements were performed, proving the positive effect of acid leaching on photocatalytic properties due to the decontamination of the powder. The authors thank the financial support from CNPq and FAPEMIG.
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