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        Competitive adsorption of arsenic and mercury on nano-magnetic activated carbons derived from hazelnut shell

        Mojtaba Zabihi,Omidvar Maryam,Alireza Motavalizadehkakhky,Rahele Zhiani 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2

        Magnetic activated carbons (AC) derived from hazelnut shell using the chemical activation method with ZnCl2 and KOH were prepared in the present work. The adsorption performance of the magnetic sorbents was evaluated for the removal of mercury and arsenic ions in the binary solutions, and the interference of ions with each other during the adsorption process was investigated. The synthesized adsorbents were characterized using XRD, FTIR, BET, XRF, FESEM, TGA and VSM. The XRD results indicated that the small iron oxide crystallites, including goethite and magnetite, were detected on the hazelnut shell-based AC activated by ZnCl2. The extended Langmuir and the modified competitive Langmuir isotherms were applied to fit the competitive adsorption of Hg (II) and As (V) ions using genetic algorithm (GA). The experimental data were in good agreement with the extended Langmuir equation, while the correlation coefficient was measured close to 1. The highest adsorption capacity was calculated to be 80 and 39.31 mg/g for mercury and arsenic ions on the magnetic sample activated by ZnCl2, respectively. The kinetic behavior of carbonaceous adsorbents was studied using pseudo-first and second-order models. The effect of various operating conditions was investigated on the competitive adsorption of metal ions.

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