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      저자 : Omidvar Maryam (검색결과 2 건)
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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.

      • A novel nanocomposite as adsorbent for formaldehyde removal from aqueous solution

        Hejri, Zahra,Hejri, Mehri,Omidvar, Maryam,Morshedi, Sadjad Techno-Press 2020 Advances in nano research Vol.8 No.1

        In order to develop a new adsorbent for removal of formaldehyde from aqueous solution, surface modification of TiO<sub>2</sub> nanoparticles was performed with 2,4-Dinitrophenylhydrazine (DNPH) that have a strong affinity to the formaldehyde. Sodium dodecyl sulfate (SDS) surfactant was used to improve the DNPH grafting to TiO<sub>2</sub> surface. Modified adsorbents were characterized by SEM, TEM, XRD, EDX and FTIR. Since the COD level in wastewaters including formaldehyde is considerable, it is necessary to determine the COD content of the synthetic wastewater. In order to determine the optimal removal conditions, the effect of contact time (60-210 min), pH (4-10) and adsorbent dosage (0.5-1.5 g/L) on adsorption and COD removal efficiencies were studied, using response surface method. EDX and FTIR analysis confirmed the presence of nitrogen-containing functional groups on the modified TiO<sub>2</sub> surface. The maximum formaldehyde adsorption and COD removal efficiencies by modified TiO<sub>2</sub> were about 15.65 and 7.35% higher than the unmodified nanoparticles respectively. Therefore, the grafting of nano-TiO<sub>2</sub> with DNPH would greatly improve its formaldehyde adsorption efficiency. The optimum conditions determined for a maximum formaldehyde removal of 99.904% and a COD reduction of 94.815% by TiO<sub>2</sub>/SDS/DNPH nanocomposites were: adsorbent dosage 1.100 g/L, pH 7.424 and the contact time 183.290 min.

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