Water Science and Technology (May 2023)

Cr(VI) anion-imprinted polymer synthesized on mesoporous silicon via synergistic action of bifunctional monomers for precise identification and separation of Cr(VI) from aqueous solution by fixed-bed adsorption

  • Ya Su,
  • Yumeng Kang,
  • Qinya Huang,
  • Jiahao Zhang,
  • Jinhua Liu,
  • Zhaoyong Hu,
  • Zhanchao Liu,
  • Yan Liu

DOI
https://doi.org/10.2166/wst.2023.127
Journal volume & issue
Vol. 87, no. 9
pp. 2061 – 2078

Abstract

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The novel Cr(VI) anion-imprinted polymer (Cr(VI)-IIP) was prepared by a surface imprinting technique with bifunctional monomers pre-assembly system based on mesoporous silicon (SBA-15). The synthesized Cr(VI)-IIP was characterized by Fourier transmission infrared spectra (FT-IR), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray powder diffractometer, N2 adsorption–desorption and thermogravimetric analysis (TGA), proving to be with a highly ordered mesoporous structure, as well as favorable thermal stability. The saturated adsorption amount was 96.32 mg/g, which was 2.7 times higher than that of non-imprinted polymer (NIP). Kinetic experiments showed that the adsorption equilibrium state was obtained within 70 min. In addition, in the selectivity experiments, Cr(VI)-IIP exhibited strong specific recognition ability for Cr(VI) and could realize the separation of Cr(VI) and Cr(III) from an aqueous solution. The dynamic adsorption experiments exhibited that the dynamic adsorption efficiency of Cr(VI)-IIP was as high as 71.57%. Meanwhile, the dynamic regeneration experiments showed that the adsorption amount of Cr(VI)-IIP did not decrease significantly after repeating for five times. All of the findings suggested that Cr(VI)-IIP could achieve precise identification as well as efficient separation of Cr(VI) from aqueous solution. HIGHLIGHTS Preparation of Cr(VI) anion-imprinted polymer (Cr(VI)-IIP) by bifunctional monomers pre-assembly system.; The Cr(VI) imprinted sites formed by the coordination of bifunctional monomers and template ions could realize the separation of Cr(VI) and Cr(III).; Cr(VI)-IIP exhibited superior selectivity compared to other common adsorbents and Cr(VI) imprinted polymers prepared by a single functional monomer.;

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