PREPARATION OF TiO2 PARTICLES IN REVERSE MICROEMULSION AND THEIR USE IN ELIMINATION OF METHYLENE BLUE USED AS REACTIVE DYE MODEL.

CAROLINA E. ZUBIETA, PAULA V. MESSINA, PABLO C. SCHULZ

Granada 13-15 de Julio

Congreso; III. REUNIÓN IBERICA DE COLOIDES E INTERFASES (RICI) VIII. REUNIÓN DEL GRUPO ESPECIALIZADO DE COLOIDES E INTERFASES (GECI); 2009

Nowadays the most widely used method for the reactive dyes elimination is degradation. The conventional methods for colour removal, like biological oxidation and chemical precipitation are not always effective and economic when the solute concentration is very low. In recent years, photocatalytic TiO2 was extensively studied due to its excellent stability, low cost, easy availability and the capacity to provide a destructive oxidation process using solar energy. In such process the oxidant is the atmospheric oxygen and the catalyst is non- hazardous.The main advantage of using the water-in-oil (W/O) microemulsions in synthesis is low reaction temperature, uniform nucleation, and short processing time that avoid the reactants supersaturation. Additionally, reverse micelles can protect the nanoparticles against excessive aggregation. Moreover, there are no organic impurities in the final product. The reverse microemulsions where composed by Aerosol OT (AOT) (C20H37NaO7S)/hexane/water using different [water]/[surfactant] (=R) ratios, we obtained three materials called R10, R20 and R30.