Synthesis of hybrid hydrogel nano-polymer composite using Graphene oxide, Chitosan and PVA and its application in waste water treatment

Abstract The present work aimed to synthesize Graphene oxide impregnated chitosan–PVA​ hydrogel nano polymer and its application to remove Congo red dye present in solution. Adsorption of dye on GO fabricated hydrogel polymer was conducted in batch system. Prepared Graphene oxide reinforced hydrogel polymer (GORHP) was characterized by analyzing FTIR and SEM. Swelling response of synthesized polymer composite were investigated at different pH. Final concentrations of dye in solution and adsorption capacities of adsorbent at various experimental conditions (adsorbent mass, solution pH and initial adsorbate concentration in solution) were evaluated. At pH 2, dye adsorption efficiency was found as 88.17%for 20 mg/L of Congo red solution using 6g/L dose at 140 rpm rotation speed and at neutral pH condition it was ≃ 81%. Different adsorption Isotherm models were analyzed mathematically. Kinetic study was performed and evaluated by following different mathematical model. Pseudo second order kinetic model gave better agreement for experimental and model value of q e . Results inferred that this synthesized polymer composite may be an efficient adsorbent for dye removal. The correlation between the independent variables associated with Congo red dye adsorption and the dependent parameters ware established by analyzing ANN model.