Abstract
A polyacrylamide-grafted starch (St-g-AM-DMC-AMPS) flocculant for the coal slurry wastewater was prepared by using corn starch (St), acrylamide (AM), methyl acryloyloxyethy trimethyl ammonium chloride (DMC) as cationic monomer, 2-acrylamido-2-methyl acrylate sulfonic acid (AMPS) as anionic monomer through solution polymerization. The structure of the synthesized St-g-AM-DMC-AMPS was characterized by FT-IR and TG. The effects of initiator concentration, reaction temperature and monomer concentration on percentage of grafting and the grafting efficiency were investigated. The results showed that the optimal conditions of the polymerization are that the ratio of substrate and monomer is 3:7, the radio of ammonium persulfate is 0.15%, reaction time is 4h and reaction temperature is 50°C. The additional dosage of St-g-AM-DMC-AMPS is varying between 12mg/L and 20 mg/L to obtain better flocculation capability than PAM.
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