Selective and efficient sequestration of Cr(VI) in ground water using trimethyloctadecylammonium bromide impregnated on Artemisia monosperma plant powder

Background: Biosorption method for Cr(VI) removal from domestic and industrial wastewater is widely desirable technicality due to its high efficiency, natural affinity, selectivity, easily operation, low costs and ecofriendly procedures. The presented work demonstrates the sequestration of hexavalent chromium ion, Cr(VI) from contaminated water by the biosorbent Artemisia monosperma (AM) powder modified by trimethyloctadecylammonium bromide (TOAB). Methods: Analytical tools of XRD, FTIR, SEM, EDS, TGA and XPS were used from one side to characterize the developed modified biosorbent TOAB@AM and from the other side to investigate the Cr(VI) adsorption. Operational parameters of pH, adsorbent dose, contact time, coexisting ions and temperature that affect adsorption process were optimized. Significant Findings: Adsorption kinetics emerges the best linearity when applying the pseudo-second order model referring to the chemisorption assumption in controlling sorption process of TOAB@AM biosorbent and Cr(VI) ions. Adsorption isothermal results are distinctly well fitted with Langmuir correlation. Furthermore, adsorption thermodynamics reveals the spontaneity and exothermic modality in adsorbing Cr(VI) onto TOAB@AM biosorbent with less randomness behavior. The optimal operational conditions for Cr (VI) removal are pH = 3; 0.1g dose of TOAB@AM; and 40 min contact time that result in adsorption capacity of Cr (VI) about 36.9 mg/g. Merits of low cost, high selectivity, and adsorptive potency of the novel TOAB@AM biosorbent towards Cr(VI) ions makes it a worthy alternative for remediating water sources from Cr(VI) contaminates within a facile and fast avenue. (c) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.