Figure 4: Adsorption and desorption of phosphate on Fe-EDA-SAMMS. During the adsorption process, 10 mL of 3 mg phosphate/L (from KH2PO4) pH 5.3 was pushed through a 0.01 g of Fe-EDA-SAMMS at a flow rate of 2 mL/min, followed by 10 mL of 0.2 M HCl at 2 mL/min for stripping off bound phosphate (desorption step).