4.5 Article

Highly effective adsorption of copper ions by poly(vinyl imidazole) cryogels

Journal

POLYMER BULLETIN
Volume 78, Issue 10, Pages 5873-5890

Publisher

SPRINGER
DOI: 10.1007/s00289-020-03413-y

Keywords

Copper ion removal; Cryogel; Vinyl imidazole; Dynamic adsorption; Adsorption isotherm

Funding

  1. National Natural Science Foundation of China [21965039, 21464017]
  2. Natural Science Foundation of Yunnan Province [2014FB139, 2018FD017]
  3. Science Research Foundation of Yunnan Education Bureau [2014Z046]

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A pure poly(vinyl imidazole) cryogel was fabricated using an improved method, showing robust underwater elastic performance and excellent adsorption capacity for Cu(II) ions with a high efficiency of 99.99% and a capacity of 148 mg/g. The cryogel also demonstrated promising reusability and regeneration capability for Cu(II) removal.
Recently, 3D cryogels with the interconnected macropore structure have gained great attention owing to their immense application potential in wastewater cleanup. Here, we fabricated a pure poly(vinyl imidazole) cryogel through improved cryogelation method, adding the pre-freezing-thawing step, which reduced the temperature difference between the different positions of the precursor solution during reaction. Compression experiments showed that the prepared 3D cryogel featured a robust underwater elastic performance. The adsorption capacity of Cu(II), Ni(II), Zn(II), Co(II), Pb(II), and Cd(II) ions from aqueous solutions by the poly(vinyl imidazole) cryogel was explored. The results showed the specific adsorption of Cu(II), in which the adsorption capacity and removal efficiency reached 148 mg/g and 99.99%, respectively. The adsorption capacity was 58 times higher than that of the reported poly(vinyl imidazole) cryogel which was prepared using hydroxyethyl methacrylate as the comonomer frameworks. In the reusability studies, the cryogel exhibited accumulating Cu(II) ions performance and excellent regeneration capability, making it a promising adsorbent for Cu(II) removal.

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