Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (8): 931-939.DOI: 10.11944/j.issn.1000-0518.2015.08.140387

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Preparation of Thiocyanate Anion-Imprinted Microspheres via Inverse Suspension Polymerization and Their Ion Recognition Characteristics

XU Rui,YANG Qing,LI Yanbin,GAO Baojiao()   

  1. Department of Chemical Engineering, North University of China, Taiyuan 030051, China
  • Received:2014-11-11 Accepted:2015-04-30 Published:2015-08-08 Online:2015-08-08
  • Contact: GAO Baojiao
  • Supported by:
    Supported by the Young Scientists Fund in National Natural Science Foundation of China(21404093)

Abstract:

Micron-sized thiocyanate anion-imprinted microspheres(IIPMs) were prepared successfully with inverse suspension polymerization method. In the inverse suspension polymerization system, cyclohexane was used as dispersion medium and Span-60 was used as dispersant in the oil phase, cationic monomer of acryloxyethyltrimethyl ammonium chloride(DAC), the crosslinker N, N'-methylene bisacrylamide(MBA) and the template SCN- anion were dissolved in aqueous phase. The crosslinking copolymerization of DAC in water-in-oil droplets was carried out and SCN- IIPMs with diameter of about 200 μm were obtained. The ion recognition selectivity and binding property were investigated with monovalent anions, NO3- and I-, as the references. In water-in-oil droplets, since cationic monomer DAC associates with SCN- anion by strong electrostatic interaction, SCN- anions are imprinted while DAC produces crosslinking polymer. The prepared IIPMs possess strong binding ability(3.3 mmol/g(192 mg/g)) and selectivity. The IIPMs can selectively recognize and bind SCN- anion from a mixture with NO3- and I- ions. The coefficients of the selectivity of IIPMs are 3.24 and 6.78, respectively. The IIPMs also exhibit excellent reusability.

 

Key words: reversed phase suspension, imprinted microspheres, electrostatic interaction, ion imprinting, ion recognition

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