Preparation and Properties of Temperature Sensitive Surface Ion Imprinted Polymers
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0647.3

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    Abstract:

    Abstract: A novel nickel ion imprinted polymers (IIPs) based on multi-walled carbon nanotubes (MWCNTs) were synthesized in inverse emulsion system, using N-isopropyl acrylamide (NIPAM) and Methyl methacrylate, Acrylic acid as the functional monomers, Ni(II) as the template,and N,N-methylene bis-acrylamide as the cross-linker.The as-prepared IIPs were characterized by Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), thermogravimetry (TG) and scanning electron microscopy (SEM). The adsorption properties of the imprinted polymer were investigated by spectrophotometry.The adsorption properties of ion imprinted polymers were investigated by dimethylglyoxime visible spectrophotometry.At the optimum adsorption temperature of 40 ℃, the maximum adsorption of Ni2+ by IIPs is 33.80 mg/g. The studies indicated that The adsorption and desorption efficiency of imprinted polymers can be controlled by changing the temperature, the adsorption process obeyed the thermodynamic Langmuir model, the second-order kinetic model. The desorption efficiency at 25 ℃ is much greater than the desorption efficiency at 50 ℃. In the presence of competitive ions Pb2+ and Cd2+, the selection coefficients of Ni2+/Pb2+ and Ni2+/Cd2+ are 12.62 and 16.12, respectively, indicating that IIPs really have a strong ability to recognize Ni2+.

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History
  • Received:June 24,2018
  • Revised:November 08,2018
  • Adopted:November 09,2018
  • Online: January 14,2019
  • Published:
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