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Issue
Korean Journal of Chemical Engineering,
Vol.32, No.7, 1314-1322, 2015
Adsorptive removal of Cr(VI) from aqueous solutions by cross-linked chitosan/bentonite composite
Liu Q, Yang B, Zhang L, Huang R
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.
Keywords: Cross-linked Chitosan/Bentonite Composite; Adsorption; Cr(VI); Kinetics; Isotherm
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[Cited By]
  1. Yao J, Kong Q, Zhu H, Shen D, Zhang Z, Korean Journal of Chemical Engineering, 33(2), 553, 2016
  2. Khitous M, Salem Z, Halliche D, Korean Journal of Chemical Engineering, 33(2), 638, 2016
  3. Dehghani MH, Zarei A, Mesdaghinia A, Nabizadeh R, Alimohammadi M, Afsharnia M, Korean Journal of Chemical Engineering, 34(3), 757, 2017
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