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Polyethylenimine-functionalized poly(vinyl alcohol) magnetic microspheres as a novel adsorbent for rapid removal of Cr(VI) from aqueous solution
Alternative TitleChem. Eng. J.
Sun, X. T.; Yang, L. R.; Li, Q.; Liu, Z. N.; Dong, T. T.; Liu, H. Z.
2015
Source PublicationChemical Engineering Journal
Issue0Pages:101-108
Abstract

A novel adsorbent, polyethylenimine-functionalized poly(vinyl alcohol) (PVA-PEI) magnetic microspheres, was prepared by a process involving: (1) synthesis of magnetic poly(vinyl acetate) microspheres (PVAc) using modified suspension polymerization, (2) preparation of PVA magnetic microspheres by methanolysis of PVAc and (3) two-step reaction with epichlorohydrin and polyethylenimine to yield amino groups. Magnetic measurement illustrated that the PVA-PEI microspheres were superparamagnetic, with a high saturated magnetization of 36.7 emu/g. Once generated, the PVA-PEI microspheres were used as adsorbent to remove Cr(VI) from an aqueous solution. The results demonstrated that the optimized pH value was observed at 2.0. The adsorption rate was extremely fast and the equilibrium was reached within 8 min. The adsorption isotherms of the adsorbent were preferably fitted to the Langmuir model, with the maximum adsorption capacity of 88.4 mg/g at 25 degrees C. Thermodynamic parameters indicated the spontaneous and exothermic nature of adsorption. In addition, the Cr(VI) ions were successfully eluted by a 0.1 mol/L NaOH solution, with the desorption efficiency of over 99%, and the adsorbent exhibited a good reusability. These results implied that the PVA-PEI microspheres should be considered as a potential adsorbent to remove Cr(VI) from wastewater. (C) 2014 Elsevier B.V. All rights reserved.

KeywordPva Polyethylenimine Superparamagnetic Cr(Vi) Adsorption High-capacity Adsorption Hexavalent Chromium Waste-water Metal-ions Kinetics Beads Polymerization Industrial Composite Cellulose
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Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11826
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Sun, X. T.,Yang, L. R.,Li, Q.,et al. Polyethylenimine-functionalized poly(vinyl alcohol) magnetic microspheres as a novel adsorbent for rapid removal of Cr(VI) from aqueous solution[J]. Chemical Engineering Journal,2015(0):101-108.
APA Sun, X. T.,Yang, L. R.,Li, Q.,Liu, Z. N.,Dong, T. T.,&Liu, H. Z..(2015).Polyethylenimine-functionalized poly(vinyl alcohol) magnetic microspheres as a novel adsorbent for rapid removal of Cr(VI) from aqueous solution.Chemical Engineering Journal(0),101-108.
MLA Sun, X. T.,et al."Polyethylenimine-functionalized poly(vinyl alcohol) magnetic microspheres as a novel adsorbent for rapid removal of Cr(VI) from aqueous solution".Chemical Engineering Journal .0(2015):101-108.
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