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Removal of chromium(VI) from aqueous solutions using polypyrrole-based magnetic composites

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Abstract

PPy/Fe3O4/AgCl composites were prepared via in situ polymerization for the removal of highly toxic Cr(VI). The structure and morphology of the prepared composites were characterized by the XRD, SEM, TEM, and VSM examinations. Up to 100 % removal was found with 1000 mg/L Cr(VI) aqueous solution at pH 2.0. The process of Cr(VI) ions’ adsorption was easy to reach equilibrium at higher temperatures. Adsorption results showed that Cr(VI) removal efficiency by the composites decreased with an increase in pH. Adsorption kinetics was described by the pseudo-second-order rate model. Isotherm data fitted well to the Langmuir isotherm model. Desorption experiment showed that the regenerated adsorption of PPy/Fe3O4/AgCl can be reused successfully for three times successive adsorption–desorption cycles without appreciable loss of its original capacity.

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Acknowledgments

The authors would like to thank the financial supports of the Science and Technology Plan of Gansu Province (145RJZA224), supported by the fund of the Education Department of Gansu Province (2014B-007), the financial supported by the fund Key Laboratory and Engineering Center of Independent Study of Northwest University for Nationalities (zyp2015016), supported by funds of Central Universities Fundamental Research (31920160011), supported by fund of the National natural Science Foundation of China (51563022), and supported by the fund of Gansu Science and Technology Support Projects (1504GKCA093).

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Authors and Affiliations

  1. Experiment Center of Northwest University for Nationalities, Lanzhou, 730030, China

    Wanhong Sun, Lihua Chen & Yu Sun

  2. Department of Petrochemical Engineering, Lanzhou Petrolchemical College of Vocational Technology, Lanzhou, 730060, China

    Yanqing Zhou

  3. College of Chemical Engineering, Northwest University for Nationalities, Lanzhou, 730030, China

    Qiong Su, Yanbin Wang, Juanli Liu & Huixia Ma

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  1. Wanhong Sun
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Correspondence to Wanhong Sun.

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Sun, W., Zhou, Y., Su, Q. et al. Removal of chromium(VI) from aqueous solutions using polypyrrole-based magnetic composites. Polym. Bull. 74, 1157–1174 (2017). https://doi.org/10.1007/s00289-016-1769-1

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  • DOI: https://doi.org/10.1007/s00289-016-1769-1

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