Study of iron adsorption on ion exchange resins for the removal of pollutants from aqueous effluents

Study of iron adsorption on ion exchange resins for the removal of pollutants from aqueous effluents

• Autor
• Caroline da Paz Santos
• Co-autores
• Aparecida M.S. Mimura , Jairo Tronto , Lilian L. R. Silva , Julio C. J. Silva
• Resumo

• The ion exchange method using commercial resins is a known treatment for industrial effluents. These resins can retain metal ions in solution on their surface by adsorption. To evaluate the applicability of this method, the best conditions for iron adsorption using a cationic exchange resin were investigated. To establish the ideal adsorption conditions, parameters such as stirring time and speed, resin mass dosage, pH and contact time were investigated. The tests were carried out for three different iron concentrations: 50, 100 and 150 mg L^-1. The experiments indicated that a stirring time of 20 minutes was satisfactory. In relation to the pH, the better results were observed for a pH 1.0. The mass of resin was varied between 0.2 to 0.6 g, the latter being the most efficient. The stirring speed was optimized with different values, so that a speed of 250 rpm resulted in a higher adsorption content. Using optimized conditions, it was possible to obtain a maximum adsorption of Fe (III) of approximately 99%. The correlation coefficient (R²) values of the pseudo-first order model was 0.6868 for Fe (III) adsorption, while pseudo-second order model correlation coefficient (R²) value was 0.9913. The theorical k₂ value calculated was 0.0456 g mg^-1 min^-1. The experimental q_e value (11.80 mg g^-1) showed good correlation with the calculated value (12.06 mg g^-1) from pseudo-second order model. Therefore, it can be concluded that the pseudo-second order model was better in describing the adsorption kinetics

• Palavras-chave
• adsorption process, ion exchange, cationic resin, metalic especies, aqueous efluent
• Área Temática
• Adsorção aplicada ao meio ambiente