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Preparation of an ionic liquid-based hydrogel with hyperbranched topology for efficient removal of Cr(VI)

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Abstract

An imidazolium salt-based hydrogel with hyperbranched topology (hbGel-PEG-TTIm+Br −6 ) was proposed for efficient adsorption towards anionic hexavalent chromium ions (Cr(VI)). For the purpose, a bromo-terminated A3 type monomer and a imidazole-terminated B3 type monomer were firstly synthesized via O-esterification and Michael addition, respectively. Then, hbGel-PEG-TTIm+Br −6 was obtained by the one-pot step polymerization of “A3 + B3” approach via N-alkylation reaction. The chemical structure and morphology of the as-prepared hydrogel were confirmed by Fourier transform infrared and scanning electron microscope. The cross-linking network structure was calculated according to the Flory–Rehner equilibrium swelling equation. The effects of solution pH, adsorbent dosage, contact time and initial Cr(VI) concentration on the adsorption performance were also investigated, and the maximum adsorption capacity could reach ~ 238 mg g−1. In addition, the adsorption process of Cr(VI) on hbGel-PEG-TTIm+Br −6 was well described by the pseudo-second-order kinetic model, and the adsorption equilibrium data fitted with Langmuir isotherm model better than Freundlich isotherm model. This novel hydrogel with hyperbranched topology can potentially be applied in the treatment of wastewater containing Cr(VI).

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Acknowledgements

This work was supported by the Science Research Foundation of Xijing University (XJ18T03 and XJ16T01), the Natural Science Foundation of Shaanxi Province (CN) (No: 2017JQ2019) and the National Natural Science Foundation of China (No: 51673157).

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Authors and Affiliations

  1. Key Laboratory of Organic Polymer Photoelectric Materials, Shaanxi Engineering Research Center for Pulse-Neutron Source and Its Application, School of Science, Xijing University, Xi’an, 710123, Shaanxi, People’s Republic of China

    Kexuan Li, Wenqi Song, Min Zhu, Yuzhen Zhao & Zongcheng Miao

  2. National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi’an, 710021, Shaanxi, People’s Republic of China

    Liwei Qian

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  1. Kexuan Li
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  2. Liwei Qian
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  3. Wenqi Song
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  4. Min Zhu
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  5. Yuzhen Zhao
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  6. Zongcheng Miao
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Correspondence to Wenqi Song or Zongcheng Miao.

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Li, K., Qian, L., Song, W. et al. Preparation of an ionic liquid-based hydrogel with hyperbranched topology for efficient removal of Cr(VI). J Mater Sci 53, 14821–14833 (2018). https://doi.org/10.1007/s10853-018-2609-5

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  • DOI: https://doi.org/10.1007/s10853-018-2609-5

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