PREPARATION AND CHARACTERIZATION OF POLYSACCHARIDE BASED SUPERABSORBENT NANOCOMPOSITE AND ITS USE IN EFFICIENT REMOVAL OF METHYLENE BLUE DYENeetu Dabi and Sangeeta LoonkerAbstract Novel guar gum-g-poly acrylic acid (GG-g-PAA) superabsorbent nanocomposites were prepared in aqueous solution using guar gum (GG), partially neutralized acrylic acid (AA), hydrogen peroxide (HP) as an initiator and N, N-methylene bisacrylamide (MBA) as crosslinkerby free radical graft copolymerization reaction. FTIR spectra confirmed that AA had been grafted onto GG chains. X-ray diffraction (XRD) to study its crystalline nature of the composite. Scanning Electron Microscopy (SEM) results shows that prepared composite have uneven and coarse surface. The present study concerns for the removal of Methylene blue dye using GG-g-PAA superabsorbent nanocomposite. The adsorption behavior of dye was studied using batch techniques at different pH values. The synthesized superabsorbent composite (SAC) was found to be effective in removing methylene blue dye up to 90 % at pH 8.5. The effect of various variables such as dye concentration, contact time, adsorbent dose, pH etc. was analyzed. Study shows that the adsorption kinetics favors pseudo second order reaction kinetics. The process of adsorption of dye follows Langmuir and Freundlich model. |