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Submitted: 03 Dec 2020
Revision: 10 Dec 2020
Accepted: 22 Dec 2020
ePublished: 31 Dec 2020
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Avicenna J Environ Health Eng. 2020;7(2): 97-108.
doi: 10.34172/ajehe.2020.15
  Abstract View: 8
  PDF Download: 6

Original Article

Isothermal, Kinetic, and Thermodynamic Studies on the Adsorption of Molybdenum by a Nanostructured Magnetic Material

Elnaz Shargh 1, Hossein Sid Kalal 2* ORCID logo, Zahra Shiri-Yekta 2, Seyed Ebrahim Mousavi 3, Mohammad Reza Almasian 2, Mohammad Tagiof 2, Hassan Hoveidi 1

1 Department of Environmental Management, Faculty of the Environment, University of Tehran, Tehran, Iran
2 Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI, P.O. Box 11365-3486, Tehran, Iran
3 School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
*Correspondence to Hossein Sid Kalal, P.O. Box 11365-3486, Email: hsidkalal@aeoi.org.ir

Abstract

In this study, the magnetic 3-(trimethoxysilyl) propyl methacrylate (TMSPMA) – poly (4-vinylpyridine) (P4VP) was synthesized and characterized. Removal of Molybdenum (Mo) from aqueous solutions using prepared material as nanosorbent was investigated. The magnetic P4VP was prepared by copolymerization of P4VP with TMSPMA. The prepared adsorbent was characterized by various techniques including the X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). The batch adsorption technique was applied and the effect of several important parameters such as pH of the aqueous solution, adsorbent dose, initial Mo(VI) concentration, contact time, and temperature was evaluated. Desorption behavior of Mo(VI) and the effect of foreign ions (Cd2+, Ca2+, Co2+, Fe3+, Ba2+ and Pt4+) in real samples were also investigated. Co (II) and Pt (IV) had a greater impact on the adsorption process than other foreign ions. The maximum capacity for Mo(VI) adsorption on the prepared adsorbent was 4.87 mg/g, which was obtained at a temperature of 40°C with an initial concentration of 10 mg/L of Mo(VI). The adsorption isotherms were best fitted with the Weber Van Vliet isotherm model. The kinetic data were fitted well with the pseudo-second-order equation with a high correlation coefficient (R2 > 0.99). Based on the negative standard Gibbs free energy change (ΔG° < 0) and the positive standard enthalpy change (ΔH° > 0), it was found that the adsorption was an endothermic and a spontaneous process in nature.
Keywords: Molybdenum removal, Batch adsorption, 3-(trimethoxysilyl) propyl methacrylate, Poly (4-vinylpyridine), Magnetic nanosorbent,

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