【摘 要】
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A novel ion-imprinted polymer,lead ion-imprinted micro-beads with combination of two functional monomers,was synthesized using the W/O/W polymerization method.T
【机 构】
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State Key Laboratory of Pollution Control and Resource Reuse,Department of Chemistry,Key Laboratory
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A novel ion-imprinted polymer,lead ion-imprinted micro-beads with combination of two functional monomers,was synthesized using the W/O/W polymerization method.Two functional monomers,1,12-dodecanediol-O,O-diphenyl-phosphonic acid (DDDPA)and 4-vinylpyridine,were used to form a suitable construction with micro-pores fitting the template and recognition sites.The effects of adsorbent dosage,solution pH and the competitive ions on the adsorption and separation efficiency of lead ions were investigated.The lead ion-imprinted micro-beads were efficient for lead ions removal from aqueous solution in a broad pH range (4-9),when the adsorbent dosage was above 0.1 g/L.The adsorption process obeyed the pseudo second-order kinetics model and it only took half an hour to reach the equilibrium.The adsorption isotherm of lead ion was described by the Langmuir model (R2 ＞0.99) with a maximum adsorption capacity of 116.9 mg/g.In the presence of competitive ions Co2+ and Cd2+,the lead ion-imprinted micro-beads showed a high selectivity for lead ions.The selectivity coefficient of pb2+/Cd2+ and pb2+/Co2+are 99.3 and 114.7,respectively.
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