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Reference type: Journal
Authors: Hassanpour S, Taghizadeh M
Article Title: Rapid and selective separation of molybdenum ions using a novel magnetic Mo(VI) ion imprinted polymer: a study of the adsorption properties.
Publication date: 2016
Journal: RSC Advances
Volume: 6
Issue: (102)
Page numbers: 100248-100261.
DOI: 10.1039/C6RA20422H

Abstract: In this work, we have developed a convenient method for the rapid and selective separation of Mo(VI) from aqueous solution by using a novel magnetic Mo(VI) ion imprinted polymer (Mo(VI)-MIIP) as the sorbent. This sorbent was synthesized using methacrylic acid (MAA) as the functional monomer, the Mo6+ anion as a template, ethylene glycol dimethacrylate (EGDMA) as a cross-linker, and Fe3O4@SiO2 as the magnetic component. The template Mo6+ ions were removed from the polymer using a solution containing 10% (v/v) methanol in HCl (0.5 mol L-1). The thermal stability, chemical structure, and magnetic properties of the synthesized sorbent were characterized using different techniques. Various parameters which affect the adsorption efficiency were evaluated in a batch system to determine the optimal adsorption conditions and reduce non-specific interactions. The results showed that the maximum adsorption capacity was 28 mg g-1, which was observed at 25 C. The equilibrium time for the adsorption of the Mo(VI) analyte was determined over 30 min, and the amount of adsorbent which gave the maximum adsorption capacity was 1 g L-1. The kinetic data, obtained under optimum conditions, could be fitted with a pseudo-second order kinetic model with a high correlation coefficient (R2 = 0.9971). The adsorption isotherm data could be well described using Langmuir adsorption isotherms, and the maximum adsorption capacity calculated from the Langmuir isotherm was 31.08 mg g-1. This was very close to the maximum adsorption capacity obtained under optimal conditions. The selectivity studies indicated that the synthesized sorbent had a high single selectivity sorption for the Mo6+ anion in the presence of competing ions. The values of the thermodynamic parameters proved that the adsorption process of molybdenum onto the synthesized sorbent was exothermic (Δ H < 0) and spontaneous (Δ G < 0). In addition, the spent MIIP can be reused several times without a significant decrease in adsorption capacity
Template and target information: molybdenum ions, Mo(VI)

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