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Proceedings title: Advanced Materials Research
Editors: Xu B, Li HY
Publisher: Trans Tech Publications
City: Switzerland
Volume number: 661
Conference information: Nanotechnology and Material Engineering Research

Abstract: A novel thermoresponsive Cu(II) ion-imprinted composite hydrogel [Cu(II)-IICH] based on N-isopropylacrylamide (NIPAM) and aminated silica (SiO2-NH2) has been prepared by in situ free-radical polymerization using Cu(II) ion as template. The Cu(II)-IICH was used to remove heavy metal ions from aqueous solution at 20 and 40oC. The Cu(II)-IICH selectively bound the template ion above a critical gel transition temperature (CGTT) of crosslinked poly(N-isopropylacrylamide) (PNIPAM). The memory was fixed by shrinking above the CGTT, and was deleted by swelling below the CGTT. In order to study the reusability of the Cu(II)-IICH, the sorption-desorption cycles were performed for five times. The results suggested that the Cu(II)-IICH can be used for several times without significantly decreasing its adsorption capacity.
Template and target information: copper ion, Cu(II)
Author keywords: Composite Hydrogels, ion-imprinted, N-Isopropylacrylamide (NIPAM)