Abstract
In this study, seven different nanocoated carbonaceous materials was synthesized using hydrothermal method. Graphene oxide and activated carbon from biochar of sawdust were used as matrix materials, and the coating materials used were mainly nanoparticles, lanthanum oxide, cerium oxide, zirconium oxide, and cellulose. The adsorption capacities of these composites were analyzed by estimating the removal capacity for the hexavalent chromium present in the solution. Parameters like adsorbent dose, pH, and metal ion concentration were studied. The composites prepared by coating activated carbon with functionalized graphene oxide and zirconium oxide had shown higher removal capacity more than 160 mg/g in acidic pH, i.e., pH 4 with 1 mg/ml adsorbent dose and up to 150 mg/l of hexavalent chromium concentration. The removal capacity was second for the activated carbon coated with graphene oxide and third highest value obtained from the composite prepared by coating activated carbon synthesized from biochar with zirconium oxide. The removal capacity obtained was directly related to the surface area and the presence of active surface functional group. The study aims to provide a better nanocoated composite for removal of hexavalent chromium present in the experimental solution.
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