Selective Adsorption of Mn~(2+) by Manganese Inprinted CysteineChitosan in Dilute Solution
Two new adsorbents,Cys-Mn-CCTS-1 and Cys-Mn-CCTS-2,were prepared via grafting cysteine onto Mn2+inprinted cross-linked chitosan hydrogel beads synthesized by dropping method. Their structures were analyzed utilizing the techniques of SEM and FTIR. Static adsorption experiments for Mn2+with low concentration indicated that both of the removal rates of Mn2+by the two adsorbents in dilute solution reached 70%. Cys-Mn-CCTS-2 still exhibited high removing efficiency of Mn2+which was 71.7% in dilute solution containing total 200 mg/L interfering metal ions of Ca2+and Mg2+. Therefore,the Cys-MnCCTS-2 was considered to have selective adsorption for Mn2+in dilute solution. However,the decreasing tendency of adsorption capacities was found for the two adsorbents with the increment of the concentration of Co2+coexisting with Mn2+in dilute solution,which was more obvious for Cys-Mn-CCTS-2.