Journal
RSC ADVANCES
Volume 5, Issue 61, Pages 49791-49801Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra06178d
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Funding
- National Science & Technology Pillar Program [2012BAJ24B03]
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Magnetic materials as adsorbents can provide effective removal and quickly separate pollutants in wastewater treatment. A magnetic CoFe2O4/MgAl-LDH composite was successfully synthesized through a low saturation coprecipitation method. The adsorption behaviors of Cr(VI) from an aqueous solution by CoFe2O4/MgAl-LDH were investigated. The adsorbents were characterized using scanning electron microscopy (SEM), N-2 adsorption-desorption isotherms, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Kinetic and equilibrium studies indicated that the experimental data of Cr(VI) adsorption were best described by pseudo-second-order kinetic and Langmuir models. The maximum adsorption capacity of CoFe2O4/MgAl-LDH for Cr(VI) was found to be 72.4 mg g(-1) at an equilibrium time of 300 min and temperature of 283 K. Evaluation of the thermodynamics parameters (Delta H < 0, Delta S < 0 and Delta G < 0) revealed the adsorption process was exothermic and spontaneous. The mechanism study showed that the adsorption of Cr(VI) onto CoFe2O4/MgAl-LDH likely involved adsorption/surface complexation and an ion exchange interaction. This study demonstrated that the magnetic CoFe2O4/MgAl-LDH composite was an effective adsorbent for Cr(VI) removal with quick separation.
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