Experimental study of Cd(II) ions elimination by bio-nanocomposite hydrogel based on starch-g-poly(acrylic acid) reinforced with cellulose nanofibers in a fixed bed column
Volume Title: 1
1Chemical Engineering, Isfahan university of technology, Isfahan, Iran
2chemical engineering department polymer group isfahan univercity of technology
In the present study, continuous adsorption of bio-nanocomposite hydrogel for removing Cd(II) ions from aqueous solution using a fixed-bed column was investigated. The bio-nanocomposite hydrogel was synthesized based on starch grafted poly (acrylic acid) (St-g-PAA) reinforced by cellulose nanofibers (CNFs). The effect of operating conditions of pH, initial concentration, and flow rate on process efficiency were investigated by using a three level Box-Behnken design (BBD) comprising 15 experiments. The gained data was employed to develop a polynomial model to optimize Cd(II) ions removal efficiency. The model specifies, the optimum Cd(II) ions removal efficiency at 82.45%, for operating conditions of pH=5, initial concentration of 10 mg/L, and flow rate of 5 mL/min, while under these conditions the efficiency was measured at 82%.