Development of graphene oxide and magnesia immobilized kaolin supported dual biopolymeric hybrid material for methyl orange and malachite green removal from water

Abstract

Industrial usage of various dyes seriously depends on the efficient treatment of industrial effluents. Efficient retention of waste matter using a variety of adsorbent materials has as a result turned into dangerous. In this research article, graphene oxide (GO) cum magnesium oxide (MgO) impregnated kaolin (KA) based chitosan (CS) and pectin (Pect) composite namely GO/MgO/KA/CS-Pect as an adsorbent material for effective methyl orange (MO) and malachite green (MG) removal in aquatic system. The physico-chemical properties like bonding, structural morphology and elemental composition of GO/MgO/KA/CS-Pect were explored with numerous sophisticated instrumental techniques viz., FTIR, SEM, XRD and EDAX analysis. The influencing parameters of adsorption method, with effect of reaction time, solution pH, dosage, pHzpc, initial MO/MG concentration and temperature were investigated for efficient removal of MO and MG removal under batch scale. The removal of MO and MG rate of the GO/MgO/KA/CS-Pect was incredibly fast and the adsorption kinetic method was driven with intraparticle diffusion and pseudo-second-order kinetics. The adsorption isotherm strongly well-adapted with Langmuir isotherm and the maximum removal efficiency of GO/MgO/KA/CS-Pect was found to be 45.50 and 42.00 mg/g for MO and MG respectively within 40 min. The MO and MG uptake by the GO/MgO/KA/CS-Pect was majorly owing to chemical adsorption namely electrostatic adsorption, hydrogen bonding and π-π interaction mechanisms. The prepared GO/MgO/KA/CS-Pect was productively regenerated with absolute ethanol and could be repetitively reused. This exploration reveals the feasibility and selectivity of the GO/MgO/KA/CS-Pect as genuine adsorbent material for removal of MO and MG from the aquatic system.