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Adsorptive removal of Cr(VI) from aqueous solutions by cross-linked chitosan/bentonite composite

  • Environmental Engineering
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Abstract

Cross-linked chitosan/bentonite composite (CCB) was prepared, and characterized by Fourier transform infrared (FTIR) spectroscopy, BET surface area and pore diameter analyses, X-ray diffraction (XRD) patterns and thermal gravimetric analyses (TGA). The adsorption of hexavalent chromium Cr(VI) onto CCB as a function of adsorbent dosage, initial Cr(VI) concentration, solution pH, and contact time was investigated through batch experiments. The removal towards Cr(VI) decreased with increasing solution pH from 2 to 11 and initial Cr(VI) concentration, while it increased with increasing adsorbent dosage. The adsorption kinetic data of Cr(VI) on CCB were well described by the pseudo-second-order model. The equilibrium data were correlated by the Langmuir isotherm model. The maximum monolayer Cr(VI) adsorption capacity for CCB at pH 2 and 293 K was 89.13mg/g. The mechanisms for the adsorption of Cr(VI) on CCB at pH 2 may include electrostatic interaction and chemical interaction between CCB and Cr(VI) ions.

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Authors and Affiliations

  1. College of Science, Northwest A&F University, Yangling, Shaanxi, 712100, China

    Qian Liu, Lujie Zhang & Ruihua Huang

  2. Xi’an Institute of Geology and Mineral Resource, Xi’an, Shaanxi, 710054, China

    Bingchao Yang

Authors
  1. Qian Liu
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  2. Bingchao Yang
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  3. Lujie Zhang
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  4. Ruihua Huang
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Correspondence to Ruihua Huang.

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Liu, Q., Yang, B., Zhang, L. et al. Adsorptive removal of Cr(VI) from aqueous solutions by cross-linked chitosan/bentonite composite. Korean J. Chem. Eng. 32, 1314–1322 (2015). https://doi.org/10.1007/s11814-014-0339-1

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  • DOI: https://doi.org/10.1007/s11814-014-0339-1

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