Abstrait

Maize Starch-g-poly(n-vinylimidazole) Synthesis and its Application in Sewage Water Treatment

Magdy W. Sabaa, Esraa H. Abdel Magid, Riham R. Mohamed

In this study, maize starch-g-poly(N-vinylimidazole) was prepared and characterized by determining its degree of substitution and elucidating its structure by FTIR. Graft copolymerization of vinyl imidazole onto starch was carried out in aqueous solution using potassium persulfate (KPS)/ sodium bisulfite (NaBS) initiator. Evidences of grafting were obtained via FTIR spectroscopy and X-ray diffraction before and after grafting. The effects of initiator concentration, monomer concentration, reaction time and temperature on the graft copolymerization were studied by determining the grafting percentage (% G), grafting efficiency (% GE) and the amount of homopolymer formed (%H). The optimum grafting conditions were determined as follows: [(KPS)/ (NaBS)]=8 × 10-2 (mol.L-1), [M]=3.5 (mol.L-1), reaction temperature=55°C and reaction time=2 h. The efficacy of the graft copolymers to uptake metal ions from their aqueous solutions was also studied. Results showed that the graft copolymers adsorbed more metal ions than starch itself. The graft copolymers were found to have antimicrobial activity against Streptococcus pneumonia and Bacillis subtilis as gram-positive and against Escherichia coli as gram-negative bacteria and against Asperigillus fumigatus and Candida albicans as fungi