Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 141, Issue -, Pages 253-259Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2015.06.023
Keywords
Ionic liquids; Hydroxy functional; Adsorption; Methylene blue; Chromium; Regeneration
Funding
- National Natural Science Foundation of China (NSFC) [21345005, 21205048]
- Shandong Provincial Natural Science Foundation of China [ZR2012BM020]
- Scientific and Technological Development Plan Item of Jinan City in China [201202088]
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The hydroxy-functionalized ionic liquids (ILs) modified with magnetic chitosan/grapheneoxide (MG-ILs-OH) were synthesized. The surface morphology of MG-ILs-OH was characterized by transmission electron microscopy, X-ray diffraction, thermo gravimetric analysis and Fourier transform infrared spectroscopy techniques. It was found that the adsorption kinetics is well fitted by a pseudo-second-order model and the adsorption isotherms agree well with the Langmuir model, and the MG-ILs-OH could be repeatedly used by simple treatment. The results showed that the addition of ILs-OH can largely increase the adsorption sites (hydroxy and amino groups) and adsorption properties. The MG-ILs-OH were used as adsorbent for the removal of methylene blue (MB) and Cr(VI) from simulated wastewater with a fast solid-liquid separation in the presence of external magnetic field. The maximum obtained adsorption capacities of MB and Cr(VI) were 243.31 and 107.99 mg/g, respectively. The application of MG-ILs-OH could effectively solve the problem that the adsorbent only adsorb similar adsorbate. (C) 2016 Published by Elsevier B.V.
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