Hydrogel,a green flocculating material,is prepared through aqueous solution copolymerization by using cotton linter as raw material,acrylamide as monomer,ammonium persulfate as initiator,and N,N′-methylene bis-acrylamide as crosslinking agent.The effects of copolymerization time,copolymerization temperature,ammonium persulfate dosage and monomer ratio on grafting rate are evaluated to obtain the best process for preparing flocculation materials.The prepared hydrogel is characterized by means of infrared spectroscopy(FT-IR),X-ray diffraction(XRD),thermogravimetric analysis(TG),scanning electron microscopy(SEM)and zeta potential.The flocculation effect of the hydrogel on kaolin simulated wastewater is investigated.It is verified that a product with a higher grafting rate can be prepared when the mass ratio of acrylamide to cotton linter is 5∶1,the initiator dosage is 0.06 g,the reaction temperature is 50℃,and the reaction time is 3 h.The turbidity removal rate of kaolin suspension(300 mg·L-1)with a pH of 3,7 and 11 by the prepared hydrogel reaches 98.6%,97.6%and 98.3%,respectively,showing a good flocculation performance.
cotton linteracrylamidegrafting copolymerizationgreen flocculation material
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