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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 1/2015

01.01.2015 | Original Contribution

Thermal-responsive ion-imprinted polymer based on magnetic mesoporous silica SBA-15 for selective removal of Sr(II) from aqueous solution

verfasst von: Yan Liu, Rui Chen, Dandan Yuan, Zhanchao Liu, Minjia Meng, Yun Wang, Juan Han, Xiangguo Meng, Fangfang Liu, Zhaoyong Hu, Wenlu Guo, Liang Ni, Yongsheng Yan

Erschienen in: Colloid and Polymer Science | Ausgabe 1/2015

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Abstract

Highly thermal-responsive magnetic Sr(II)-imprinted polymer (Sr(II)-TMIIP) was successfully synthesized as a potential effective adsorbent for selective removal of Sr(II) in aquatic environments. First, magnetic polyethyleneimine-loaded mesoporous SBA-15 (Fe3O4@PEI-SBA-15) was prepared via a simple polymer-mediated self-assembly method. Then, the surface of Fe3O4@PEI-SBA-15 was endowed with reactive vinyl groups through modification with 3-(methacryloyloxy)propyl trimethoxysilane (MPS). With the aid of vinyl groups, free radical polymerization of N-isopropylacrylamide (NIPAM), methacrylic acid (MAA), and N,N′-methylenebisacrylamide (BIS) in the presence of Sr(II) was performed with 2,2′-azobisisobutyronitrile (AIBN) as initiator, which provided a desired imprinted layer coating onto Fe3O4@PEI-SBA-15. The as-prepared Sr(II)-TMIIP was characterized by Fourier transmission infrared spectra (FT-IR), X-ray diffractometer (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), UV, and N2 adsorption–desorption techniques. The results showed that the Sr(II)-TMIIP exhibited thermal stability, temperature and magnetic sensitivity (M s = 10.34 emu/g), and ordered mesoporous structure. Batch mode adsorption studies were conducted to investigate the specific binding kinetics, adsorption equilibrium, and selective recognition ability of Sr(II)-TMIIP. Adsorption equilibrium experiments showed that the adsorption amount strongly depended on temperature and reached a maximum around the lower critical solution temperature (LCST). Regeneration experiments indicated that repeated adsorption and desorption by temperature swings were possible. Compared with the nonimprinted polymer (NIP), the Sr(II)-TMIIP had good temperature response and excellent selectivity and reusability, making it possible in applying for Sr(II) separation and controlled release.
Vorheriger Artikel Aggregation behavior of X-shaped branched block copolymers at the air/water interface: effect of block sequence and temperature
Nächster Artikel Study on the magnetic ODSA-in-water Pickering emulsion stabilized by Fe3O4 nanoparticle

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Metadaten
Titel
Thermal-responsive ion-imprinted polymer based on magnetic mesoporous silica SBA-15 for selective removal of Sr(II) from aqueous solution
verfasst von
Yan Liu
Rui Chen
Dandan Yuan
Zhanchao Liu
Minjia Meng
Yun Wang
Juan Han
Xiangguo Meng
Fangfang Liu
Zhaoyong Hu
Wenlu Guo
Liang Ni
Yongsheng Yan
Publikationsdatum
01.01.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 1/2015
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-014-3393-7

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