Utilização de caulinita como adsorvente na remoção de corante vermelho bf-3rs

Abstract

The growing industrial and population advance, combined with a great exploitation of environmental resources, have caused strong impacts in relation to the sustainability of natural ecosystems, whether due to poor water quality or atmospheric pollution. That said, industries are looking for solutions for the treatment of their effluents, including dyes. For this, several studies and processes are developed to remove these effluents. Thus, we can highlight the adsorption process, which has high efficiency at low cost. In this context, the chosen adsorbent, in its natural form and subjected to heat treatment, was kaolinite, an abundant clay mineral in nature, which has a high adsorption potential. First, the samples were characterized using X-ray Diffraction, Infrared Spectroscopy and Zero-charge point techniques. of kaolinite. The results obtained were more satisfactory for natural kaolinite, as it presented a removal percentage above 90% for a given concentration, and adjusted pH, from the analysis of the zero-charge point, while the thermally treated one obtained a removal percentage close to the 25%, and lower adsorption capacities. Subsequently, a kinetic study was carried out, with the objective of identifying which model best suited the results obtained, and the pseudo-second order model best described the process. Finally, the values obtained demonstrate that kaolinite in its natural form has great potential in removing the red dye BF-3rs, when the concentration and pH are controlled, and that there is no requirement for heat treatment to obtain good results.