Degradação do ácido acetilsalicílico utilizando CoO@TiO2 como catalisador

Abstract

Some pollutants, such as pharmacos, are present in low concentrations in water resources, and are resistant to conventional treatments performed in water treatment plants. This situation generates an environmental concern by the lack of legislation to regulate the tolerable limit of the pollutant in question. Thinking about it, this work studied the application of heterogeneous photocatalysis of acetylsalicylic acid (ASA) as an alternative of unconventional water treatment, using the core-shell CoO@TiO2 catalyst, comparing this catalyst with other four different catalysts (Nb2O5, TiO2, TiO2@Nb2O5 and Nb2O5@TiO2), in search of the most efficient, in other words, the one that has the best removal of the emerging pollutant, In addition to the optimization of parameters such as pH and catalyst concentration. The results indicate that the best catalyst was Nb2O5@TiO2, used ata concentration of 1g/L and pH equal to 5. In this condition, removal was 38.9% of the initial ASA concentration.