Microwave assisted synthesis of polyacrylamide grafted sodium alginate and its application in methylene blue removal

Abstract

Copolymer (SAG-g-PAAM) of sodium alginate (SAG) grafted with polyacrylamide (PAAM) was prepared by microwave irradiation and using potassium persulfate as initiator. Then, the graft copolymer was characterized by fourier transform infrared spectroscopy (FTIR) as evidence for grafting. Afterthat, the graft copolymer^,s efficiency was investigated to remove 50 ppm of methylene blue dye at optimum parameters which were pH=9, temperature 25 ^oC, time of mixing 120 min, speed of mixing 400 rpm and the polymer dosage (m/v= 0.6 g / 50 ml); and the results show that graft copolymer removed 95.2 % of dye. Furthermore, the gelation % and maximum swelling % for the prepared copolymer were 63.16 % and 1250 % respectively.