Absorption of Hg (II) Form Aqueous Solution onto Double Crosslinked Amphoteric Cassava Starch Resin

Abstract

Sodium polyphosphate-crosslinked starch was synthesized by using cassava starch and sodium polyphosphate as main material and crosslinked agent individually. On above basis, double crosslinked amphoteric cassava starch resin was synthesized through three steps of reactions, which included the inner-crosslinked reaction of starch with N,N '-methylene bisacrylamide, the grafted reaction of the obtained copolymer with dimethyl diallyl ammonium chloride (DMDAAC) and the grafted reaction of the obtained copolymer with acrylic acid. The product was characterized by scanning electron microscopy (SEM). The results indicate that the cassava starch was modified successfully. Adsorption behavior of Hg 2+ was studied in the condition of different adsorption time, and found that the removal rate and the adsorption capacity of Hg 2+ reached up to 95.98% and 191.97 mg/g respectively.