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    Synthesis and application of magnetic hydrogel for Cr(VI) removal from contaminated water

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    Type
    Article
    Authors
    Tang, Samuel C N
    Wang, Peng cc
    Yin, Ke
    Lo., Irene Man Chi
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Environmental Nanotechnology Lab
    Date
    2010-11
    Permanent link to this record
    http://hdl.handle.net/10754/561583
    
    Metadata
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    Abstract
    Many magnetic adsorbents reported in the literature, such as iron oxides, for Cr(VI) removal have been found effective only in low pH environments. Moreover, the application of polymeric hydrogels on heavy metal removal has been hindered by difficulties in separation by filtration. In this study, a magnetic cationic hydrogel was synthesized for Cr(VI) removal from contaminated water, making use of the advantages of magnetic adsorbents and polymeric hydrogels. The magnetic hydrogel was produced by imbedding 10-nm γ-Fe2O 3 nanoparticles into the polymeric matrix via radical polymerization. Characterization of the hydrogel was undertaken with Fourier transform infrared and vibrating sample magnetometer; swelling properties were tested and anionic adsorption capacity was evaluated. The magnetic hydrogel showed a superior Cr(VI) removal capacity compared to commercial products such as MIEX®. Cr(VI) removal was independent of solution pH. Results show that Cr(VI) removal kinetics was improved drastically by grinding the bulk hydrogel into powder form. At relevant concentrations, common water anions (e.g., Cl-, SO4 2-, PO4 3-) and natural organic matter did not exhibit significant inhibition of Cr(VI) adsorption onto the hydrogel. Results of vibrating sample magnetometer indicate that the magnetic hydrogel can be easily separated from treatment systems. Regeneration of the magnetic hydrogel can be easily achieved by washing the Cr(VI)-loaded hydrogel with 0.5 M NaCl solution, with a recovery rate of about 90% of Cr(VI). © Copyright 2010, Mary Ann Liebert, Inc. 2010.
    Citation
    Tang, S. C. N., Wang, P., Yin, K., & Lo, I. M. C. (2010). Synthesis and Application of Magnetic Hydrogel for Cr(VI) Removal from Contaminated Water. Environmental Engineering Science, 27(11), 947–954. doi:10.1089/ees.2010.0112
    Publisher
    Mary Ann Liebert Inc
    Journal
    Environmental Engineering Science
    DOI
    10.1089/ees.2010.0112
    ae974a485f413a2113503eed53cd6c53
    10.1089/ees.2010.0112
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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