Estudo da síntese por reação de combustão do TiO2 visando a obtenção de suporte poroso com potencial aplicação para membranas cerâmicas.

Abstract

In recent years, titanium dioxide (Ti02) has received much attention from the scientific community to present excellent catalytic properties, optical, mechanical, electrical, non-toxicity and be chemically inert. All these features make this oxide is applied in many different industry sectors: technology sensors, photocatalysis, optics and electronics and the development of ceramic membranes. It is also known that these properties are dependent on the application and type crystal structure and processing method used to obtain them. Thus, this paper proposes to investigate the influence of the type of container used in the synthesis of Ti02 and evaluating the structural and morphological behavior of the material synthesized by combustion in large laboratory scale and then investigate its feasibility in obtaining ceramic membranes. The synthesis of Ti02 was made by using different types of containers with volumetric capacities of 200, 250 and 2000 mL and urea as fuel. Subsequently support was prepared by the method of uniaxial disk-shaped 50 mm in diameter and 4 mm in thickness and sintered at 1200 ° C for 2 hours. The samples were characterized by techniques: X-ray diffraction, X-ray fluorescence, particle size distribution, scanning electron microscopy, textural analysis and thermal analysis and mercury porosimetry. The results showed that all recipients have led to formation of two phases rutile and anatase, with a crystallinity ranging from 40 to 81 %. All samples showed large cluster morphology, uneven and irregular. The results indicate that the container with volume capacity of 2000 mL enabled the production of Ti02 in batches of 30 g of product. In sintered supports was identified the presence of anatase and rutile phases and porosity of 47 %, indicating that a material with great potential for obtaining ceramic membranes for application in microfiltration processes.