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Reference type: Journal
Authors: Zeng JX, Dong ZH, Zhang Z, Liu Y
Article Title: Preparation of a surface-grafted imprinted ceramic membrane for selective separation of molybdate anion from water solutions.
Publication date: 2017
Journal: Journal of Hazardous Materials
Volume: 333
Page numbers: 128-136.
DOI: 10.1016/j.jhazmat.2017.03.016
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0304389417301711

Abstract: A surface-grafted imprinted ceramic membrane (IIP-PVI/CM) for recognizing molybdate (Mo(VI)) anion was prepared by surface-initiated graft-polymerization. Firstly, raw alumina ceramic membrane (CM) was deposited with SiO2 active layer by situ hydrolysis deposition method. Subsequently, γ-methacryloxy propyl trimethoxyl silane (MPS) was used as a coupling agent to introduce double bonds onto the SiO2 layer (MPS-CM). Then, 1-vinylimidazole (VI) was employed as a functional monomer to graft-polymerization onto the MPS-CM (PVI-CM). During the graft-polymerization, the influence factors of grafting degree of PVI were investigated in detail. Under optimum conditions (monomer concentration 20 wt%, temperature 70 C, initiator amount 1.1 wt% and reaction time 8 h), the grafting degree of 20.39 g/100 g was obtained. Further, Mo(VI) anion was used as a template to imprint in the PVI-CM by employing 1,6-dibromohexane as a cross-linking agent, and then Mo(VI) was removed, obtaining the IIP-PVI/CM with many imprinted cavities for Mo(VI). Thereafter, static adsorption and dynamic separation properties of IIP-PVI/CM for Mo(VI) were studied. Results indicate that IIP-PVI/CM shows a specific selectivity for Mo(VI) with the adsorption capacity of 0.69 mmol/100 g, and the selectivity coefficient of IIP-PVI/CM is 7.48 for molybdate to tungstate anions. During the dynamic separation, IIP-PVI/CM has also good selectivity for separation of Mo(VI) and W(VI) anions
Template and target information: molybdate anion, Mo(VI)
Author keywords: graft polymerization, Surface ion-imprinted, Ceramic membrane, Molybdate(VI) anion, selective adsorption


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