Abstract
Chromium (Cr) contaminated water possesses a serious threat to the entire environment. Hence, approaches leading to the reduction of Cr concentration from aqueous media must be employed, primarily in industries so as to check the efflux of contaminants directly to water source. Recently chemical free synthesized nanoadsorbents have received much more attention essentially for the removal of different toxic metals from water. Therefore, in this work we have developed a plant-mediated synthetic route for the production of graphene oxide (GO) decorated MgO nanomaterial (GO-MgO) using Azadirachta indica (Neem) leaf extract and subsequently applied it as an efficient adsorbent for the removal of highly carcinogenic Cr(VI) ions from water. Different types of analytical techniques such as XRD, FTIR, Raman, BET, FESEM and HRTEM were used to estimate the formation, bonding, functionality, surface area and morphology of GO-MgO nanocomposite. The effect of adsorbent dose, pH of the solution, reaction time, concentration and co-existing ions were studied to estimate the Cr(VI) adsorption on GO-MgO surface. Maximum adsorption efficiency occurred at pH = 4 through electrostatic attraction between Cr(VI) species and GO-MgO surface with maximum uptake capacity value of 132.72 mg/g. The adsorption process followed Pseudo-second-order (PSO) kinetic and Langmuir isotherm models. The Cr(VI) adsorbed GO-MgO is recyclable and thus was reused up to five consecutive cycles.
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