Abstract
Cationic modified cross-linked starch-based flocculant IStAD was synthesized by graft copolymerization with cross-linked starch (ISt), acrylamide (AM), and methacryloyloxyethyl trimethylammonium chloride (DMC) as raw materials and ceric ammonium nitrate (CAN) as initiator. The effects of the amount of initiator and graft monomer on the flocculation performance of the product were studied, and the structure of the product was characterized by ATR-FTIR and SEM. The results showed that the optimal synthetic conditions of IStAD were m(ISt):m(CAN)=1:0.3, m(ISt):m(AM):m(DMC)=1:0.3:0.7, the synthesis temperature 60 °C and the synthesis time 4 h. When IStAD was used to treat 2 wt% kaolin suspension, the optimal dosage was 14 mg/L and the light transmittance of supernatant reached 85.7%.
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