Degradation of C.I. Reactive Blue 19 using combined iron scrap process and coagulation/flocculation by a novel Al(OH)3–polyacrylamide hybrid polymer

The removal of C.I. Reactive Blue 19 dye at initial concentration of 1000 mg/L was studied using iron scrap process and coagulation/flocculation by a novel synthesized Al(OH)3–PAM inorganic–organic hybrid polymer. A novel synthesized Al(OH)3–PAM was prepared using a redox initiation system while (NH4)2S2O8 and NaHSO3 were used to initiate the polymerization at 50 °C in aqueous medium. The Al(OH)3–PAM was characterized using FT-IR spectroscopy, TEM, and XRD. pH of dye solution and Al(OH)3–PAM dosage have been studied while COD reduction and color removal in different settling times were investigated. The results show that 26% of (COD) content and 45% of color have been removed by iron scrap process. Meanwhile 90% of the color and 82% of COD have been removed by Al(OH)3–PAM hybrid polymer in an optimum dosage of 700 mg/L and optimum effective pH between pH of 5–6.

► Iron scrap can give 26% of COD reduction and 45% of color removal. ► A novel synthesized Al(OH)3–PAM inorganic–organic hybrid polymer was investigated. ► Al(OH)3–PAM hybrid polymer was characterized using FT-IR, TEM, and XRD analysis. ► Al(OH)3–PAM hybrid polymer can remove 82% of COD and 90% of color by coagulation. ► Optimum pH was in 5–6 using 700 mg/L optimum dose of Al(OH)3–PAM in coagulation.