1Part Time Research Scholar, Manonmanium Sundaranar University, Tirunelveli, Tamil Nadu, India
2Part Time off Campus Scholar, Dravidian University, Kuppam, Andhra Pradesh, India
3Associate Professor, Sacred Heart College, Tirupattur, Tamil Nadu, India
4Department of Chemistry, DKM College for Women, Vellore, Tamil Nadu, India
Chitosan – g – maleic anhydride (MA) was synthesized by reaction of chitosan with maleic anhydride in N, N dimethyl formamide. Chitosan – g – maleic anhydride – g – (acrylonitrile) copolymer was prepared via free radical polymerization using ceric ammonium nitrate as the initiator. The effect of polymerization variables including initiator concentration, monomer concentration and reaction temperature on grafting percentage were studied. It was found that the grafting yield and grafting efficiency were increased with increasing the polymerization and then decreased. The grafting was maximum at 1.4 g of initiator (CAN), 2 g of the monomer (acrylonitrile) at 70°C. The co polymer obtained was confirmed by FTIR, XRD, TGA and DSC analysis. This graft co polymer was used as an adsorbent in dye effluent treatment. Equilibrium sorption experiments were carried out. Data were tested with three isotherm models like Langmuir, Freundlich, and Dubinin – Radushkevich isotherm model. Their trends of applicability from the R2 values follows the order Freundlich > Langmuir > D – R.
Chitosan, graft copolymer, grafting percentage, adsorption isotherm, wastewater treatment
