Journal
MATERIALS
Volume 8, Issue 12, Pages 8378-8391Publisher
MDPI
DOI: 10.3390/ma8125461
Keywords
magnetic polymer microspheres; chromium(VI); adsorption; kinetic; isotherms
Categories
Funding
- National Natural Science Foundation of China [51263013]
- Science and Technology Foundation of Higher Education of Inner Mongolia [NJZC14273]
- Natural Science Foundation of Inner Mongolia [2014MS0215, 990301-5]
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Magnetic polymer microspheres (MPMs) using glycidylmethacrylate (GMA) as a functional monomer were synthesized in the presence of Fe3O4 nanoparticles via dispersion polymerization. After polymerization, the magnetic polymer microbeads were modified with ethylenediamine (EDA). The obtained ethylenediamine-functionalized magnetic microspheres (EDA-MPMs) were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), vibrating-sample magnetometer (VSM) and Fourier transform infrared (FT-IR) spectroscopy. Then the EDA-MPMs were applied as adsorbents for the removal of Cr(VI) from aqueous solution. Langmuir equation was appropriate to describe the experimental data. The maximum adsorption capacities obtained from the Langmuir model were 236.9, 242.1 and 253.2 mg/g at 298, 308 and 318 K, respectively. The Cr(VI) adsorption equilibrium was established within 120 min and the adsorption kinetics was compatibly described by the pseudo-second order equation. The thermodynamic parameters (G degrees, H degrees, S degrees) of the sorption process revealed that the adsorption was spontaneous and was an endothermic process. The regeneration study demonstrated that the EDA-MPMs could be repeatedly utilized with no significant loss of adsorption efficiency.
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