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Research on Chemical Intermediates

, Volume 41, Issue 12, pp 9655–9671 | Cite as

Exfoliated polypyrrole/montmorillonite nanocomposite with flake-like structure for Cr(VI) removal from aqueous solution

  • Jun Chen
  • Xiaoqin Hong
  • Qingdong Xie
  • Min Tian
  • Ke Li
  • Qianfeng Zhang
Article

Abstract

Exfoliated polypyrrole/montmorillonite (PPy/MMT) nanocomposites with flake-like structure were prepared by in situ chemical oxidation polymerization. Amphoteric polymer, (2-methacryloyloxyethyl) trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large amount of carboxyl acid was introduced on the surface of clay platelets which can play a ‘bridge’ role to combine PPy with clay. The adsorption of Cr(VI) on the PPy/MMT was highly pH-dependent and the adsorption kinetics followed the pseudo-second-order model. The Langmuir isothermal model well described the adsorption isotherm data, whiler the maximum adsorption capacity increased with the increase of temperature. Thermodynamic investigation indicated that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the adsorbent–liquid interface. The maximum adsorption capacity of the PPy/MMT composites for Cr(VI) was 166.7 mg/g. A desorption experiment showed PPy/MMT composites can be regenerated and reused for two consecutive cycles with no loss of their removal efficiency.

Keywords

Exfoliated nanocomposite Polypyrrole Adsorption Hexavalent chromium Regeneration 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 21207001 and U146010055), the Natural Science Fund of Anhui Provincial Education committee of P. R. China (KJ2012Z036), Anhui Province College Outstanding Young Talent Fund of P.R. China (2012SQRL032ZD) and National Undergraduate Training Programs for Innovation and Entrepreneurship (201310360026).

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Jun Chen
    • 1
  • Xiaoqin Hong
    • 1
  • Qingdong Xie
    • 1
  • Min Tian
    • 1
  • Ke Li
    • 1
  • Qianfeng Zhang
    • 1
  1. 1.School of Chemistry and Chemical Engineering, Institute of Molecular Engineering and Applied ChemistryAnhui University of TechnologyMa’anshanChina

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