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Abstract: A novel imprinted ceramic membrane (IIP-PVI/CM) for adsorbing selectively molybdate anion[Mo(VI)] was prepared with surface imprinting technology and graft-polymerization using an alumina ceramic membrane as the supporting material, Mo(VI) as the template ion, 1-vinylimidazole as the functional monomer and 1,6-dibromohexane as the cross-linking agent. The obtained samples were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and scanning electron microscopy. Effect of pH value on adsorption performance of IIP-PVI/CM was investigated. The results indicate that IIP-PVI/CM shows a good adsorption capacity in the pH range of 2-4. The adsorption behaves of IIP-PVI/CM toward Mo(VI) were studied through adsorption kinetics and thermodynamics. The kinetics curve meets pseudo-second-order model. The adsorption isotherm can be described by Langmuir isotherm model. The selective adsorption experiment for IIP-PVI/CM was carried out at pH of 4.0 and temperature of 30 °C by a mixed solution containing 4 mmol/L Mo(VI) and 4 mmol/L W(VI). It was found that IIP-PVI/CM has specific selectivity for Mo(VI), and the selectivity coefficient is 7.48 for Mo(VI) to W(VI). A dynamic adsorption experiment was done by a membrane apparatus. The results indicate that IIP-PVI/CM also shows good selectivity for separation of Mo(VI) and W(VI). The values of the saturated adsorption time of W(VI) and Mo(VI) anions are 24 and 47 min, corresponding to the saturated adsorption amounts of 0.163 mmol/100 g for W(VI) and 0.672 mmol/100 g for Mo(VI), respectively. After nine adsorption-desorption cycles, the adsorption capacity of IIP-PVI/CM towards Mo(VI) still reaches 92% of the initial capacity. The IIP-PVI/CM has good regeneration and recycling performance.
Template and target information: molybdate anion, Mo(VI)
Author keywords: Ceramic membrane, Molybdate anion, Surface ion-imprinting, selective adsorption