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Mechanisms of chromium and arsenite adsorption by amino-functionalized SBA-15

Abstract

The adsorption of Cr(VI) and As(III) by amino-functionalized SBA-15 (NH2-SBA-15) from single and binary systems were investigated in this work. The effects of pH and temperature on the adsorption of NH2-SBA-15 were studied. Adsorption kinetics, isotherm model, and thermodynamics were studied to analyze the experimental data. pH 2 was the optimum condition for the adsorption of Cr(VI) and pH 4 for As(III) adsorption. Increasing temperature had a positive effect on the removal of both Cr(VI) and As(III). The Freundlich isotherm model can depict the adsorption process best. The pseudo-second-order kinetic model fitted well with the kinetic data of Cr(VI) and As(III) in the single-component system. In the binary system, the adsorption of As(III) by NH2-SBA-15 was slightly enhanced with the presence of Cr(VI); however, As(III) had no obvious effect on the removal of Cr(VI). Regeneration experiments indicated that 0.1 mol/L NaHCO3 was an efficient desorbent for the recovery of Cr(VI) and As(III) from NH2-SBA-15; the desorption rates for Cr(VI) and As(III) were 91.6 and 33.59 %, respectively. After five recycling cycles, the removal rates were 88 and 7 % for Cr(VI) and As(III) adsorption by NH2-SBA-15, respectively.

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Correspondence to Yunying Wu.

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Responsible editor: Angeles Blanco

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Wu, Y., Zhou, J., Jin, Y. et al. Mechanisms of chromium and arsenite adsorption by amino-functionalized SBA-15. Environ Sci Pollut Res 21, 1859–1874 (2014). https://doi.org/10.1007/s11356-013-2076-0

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Keywords

  • SBA-15
  • Adsorption
  • Isotherm
  • Kinetics
  • Thermodynamic
  • Regeneration
  • Amino-functionalized