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Reference type: Journal
Authors: Su HJ, Li J, Tan TW
Article Title: Adsorption mechanism for imprinted ion (Ni2+) of the surface molecular imprinting adsorbent (SMIA).
Publication date: 2008
Journal: Biochemical Engineering Journal
Volume: 39
Issue: (3)
Page numbers: 503-509.
DOI: 10.1016/j.bej.2007.11.011
Alternative URL: http://www.sciencedirect.com/science/article/B6V5N-4R6B2W2-1/1/9aac7f9a9f1c84c031259d322bdf987f

Abstract: The adsorption mechanism for the imprinted ion (Ni2+) of a novel surface molecular imprinting adsorbent (SMIA) prepared by the imprinting technique was studied. The interaction mechanism for the imprinted ion (Ni2+) with -OH and -NH2 groups on the chitosan molecules was testified by Fourier transform-infrared spectrometry (FT-IR) and X-ray photoelectron spectroscopy (XPS). By the means of FT-IR and XPS analysis, there exist two kinds of -NH2 groups on the chitosan molecule. Most -NH2 groups showed higher adsorption activity owing to using the imprinting technique in the adsorbent preparation, whereas a few -NH2 groups displayed a lower adsorption activity because of being cross-linked in preparation, which caused different adsorption mechanisms for Ni2+. Compared with the surface molecular non-imprinting adsorbent (non-SMIA), both -OH and -NH2 groups on the imprinted adsorbent surface could provide higher adsorption activity to Ni2+ based on FT-IR and XPS analyses. SMIA had more pores and bigger specific surface area than non-SMIA according to the distribution of the pore diameter and specific surface area analyses. Based on the above research, a higher adsorption capacity and a better selectivity for the imprinted ions of SMIA could be interpreted
Author keywords: adsorption mechanism, metal ion, The surface molecular imprinting adsorbent (SMIA), Fourier transform-infrared spectrometry, X-ray photoelectron spectroscopy

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