Development and Performance of a Novel Molecular Imprinted Thermosensitive Gel with a Cross-linked Chelating Group for the Temperature Swing Adsorption of a Target Metal

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Hideaki Tokuyama¹  Masaru Fujioka²  Shuji Sakohara² 

[1]Department of Chemical Engineering, Graduate School of Engineering, Nagoya University

[2]Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University

关键词: Thermosensitive Gel;    Temperature Swing Adsorption;    Molecular Imprinting Technique;    N-Isopropylacrylamide;    Heavy Metal;   

DOI  :  10.1252/jcej.38.633

来源: Maruzen Company Ltd

【 摘 要 】

References(7)Cited-By(9)Molecular imprinted thermosensitive gels adsorb and/or desorb a specific heavy metal by taking advantage of temperature swing, resulting from the reconstruction/destruction of a multi-point adsorption site corresponding to the shrinking/swelling of the gel network. Imprinted gels were prepared by copolymerizing N-isopropylacrylamide (NIPA) as a thermosensitive component, a chelating monomer and a cross-linker by means of a molecular imprinting technique using Cu(II) ions as a template. Two types of chelating monomers were used in this study, N-4-(vinylbenzyl)ethylenediamine (VBEDA) and N,N′-di(4-vinyl)benzylethylenediamine (DVBEDA), which contain single and dual vinyl groups, respectively. DVBEDA, a novel chelating monomer, was developed to improve the performance of the gel, and the performances of the NIPA-DVBEDA and NIPA-VBEDA gels were compared. Both imprinted gels repeatedly adsorbed and desorbed Cu by virtue of a temperature swing between 30 and 10°C, where the variations in the amounts of Cu adsorbed on the NIPA-DVBEDA gels were larger than those on the NIPA-VBEDA gels. Both of the imprinted gels selectively adsorbed Cu, which was used as a template molecule, from a solution of Cu, Ni and Zn, where NIPA-DVBEDA had a higher selectivity than NIPA-VBEDA. The improved performance of the NIPA-DVBEDA gels can be attributed to critical control of the reconstruction/destruction of the multi-point adsorption site given by the cross-linking of the DVBEDA on the gel network. The Langmuir parameter describing the equilibria of temperature swing adsorption also indicated that the imprinted NIPA-DVBEDA gels were high-performance in nature.

【 授权许可】

Unknown