Catalisadores sol-gel estruturados para remoção de bário em processo contínuo

Abstract

This study describes the use of a system for continuous flow photocatalytic reaction process using TiO2 sol-gel structured catalyst on stainless steel meshes to investigate barium (II) removal. In order to verify its photocatalytic activity bath tests was carried out. The catalyst was immobilized in three types of meshes and calcined at three temperatures (350, 550 and 750 ºC). The continuous flow photocatalytic tests were carried out under different experimental conditions by an experimental design to verify the parameters (pH and volumetric flow rate) effect. The results indicated that TiO2 sol-gel catalyst presented activity very similar to TiO2 P25 when using in suspension powder (about 32% Ba2+ reduction). In continuous flow, the calcination temperature at which there was greater adhesion of the catalyst on the nets was 550 ºC. The experimental design indicated only pH as significant parameter under some of the conditions studied. Therefore, it was observed that at pHs close to 7 and lower flow rates it was possible to obtain about 20% Ba2+ ions removal, in a continuous flow reactor with 83 minutes residence time.