Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 33, Pages 17167-17175Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm32821f
Keywords
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Funding
- National Natural Science Foundation of China [21077046, 21107037, 21176107]
- Ph.D. Programs Foundation of Ministry of Education of China [20093227110015]
- Natural Science Foundation of Jiangsu Province [BK2011461, BK2011514]
- China Postdoctoral Science Foundation [20110491352]
- Postdoctoral Science Foundation of Jiangsu Province [1101036C]
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CoFe2O4/halloysite nanotube magnetic composites (MHNTs) were firstly achieved via a wet impregnation technique, and then a thermal polymerization under (NH4)(2)S2O8 chain initiation in water was employed to obtain methacrylic acid-functionalized MHNTs (MAA-MHNTs). By decorating the MAA-MHNTs with the temperature responsive monomer N-isopropylacrylamide (NIPAM), a novel temperature responsive molecularly imprinted material based on the obtained NIPAM-MHNTs (TMMIPs) was synthesized by a surface imprinting technique. The results of characterization indicated that the TMMIPs exhibited magnetic sensitivity (M-s = 1.758 emu g(-1)), magnetic stability (in the pH range of 2.0-8.0), thermal stability (especially below 200 degrees C) and contained a temperature responsive imprinted layer (the lower critical solution temperature was 33.96 degrees C). Then the TMMIPs were applied to switched recognition and release of 2,4,5-trichlorophenol molecules (5-TCP) by changing the medium temperature. TMMIPs showed outstanding recognition ability towards the imprinted species under high temperature conditions (such as 60 degrees C), due to the loss of hydration and a collapsed state of inter-poly(N-isopropylacrylamide), which resulted in the formation of a specific structure between 5-TCP and the polymer network. In contrast, at relatively low temperatures (such as 20 degrees C), the captured 5-TCP was released from the swelled TMMIPs, which resulted from increasing the distance between 5-TCP and the polymer network. The selective analysis demonstrated the high affinity and selectivity of TMMIPs towards 5-TCP over competitive phenolic compounds, and the specific recognition of binding sites may be based on the distinct size, structure and functional groups of the template molecules.
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