Acetato de quitosana como adsorvente natural para remoção de ferro em água

Abstract

Water is an essential natural resource for life and is widely used in various human activities; however, its excessive use compromises both its quality and availability. Adsorbents derived from natural raw material residues have emerged as an alternative to replace synthetic polymers commonly used in water treatment plants. This study evaluated the efficiency of chitosan acetate as a natural adsorbent for iron removal in water. Adsorption tests were conducted by varying the adsorbent mass (0.5 to 1 g/L) and contact time (17 to 60 min) to determine the iron removal efficiency in the sample. The results showed that the adsorbent exhibited a high removal capacity, achieving 97% efficiency. In order to determine the best conditions for the adsorbent’s application, a central composite rotational design (CCRD) was carried out, which indicated that the studied variables did not show significant influence (p<0.05) on the response. The lack of statistical significance suggests that other factors not experimentally controlled may have influenced the results.