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dc.contributor.authorTang, Samuel C N
dc.contributor.authorWang, Peng
dc.contributor.authorYin, Ke
dc.contributor.authorLo., Irene Man Chi
dc.date.accessioned2015-08-02T09:14:44Z
dc.date.available2015-08-02T09:14:44Z
dc.date.issued2010-11
dc.identifier.citationTang, 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
dc.identifier.issn10928758
dc.identifier.doi10.1089/ees.2010.0112
dc.identifier.urihttp://hdl.handle.net/10754/561583
dc.description.abstractMany 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.
dc.publisherMary Ann Liebert Inc
dc.subjectadsorbent
dc.subjectchromium
dc.subjecthydrogel
dc.subjection exchange
dc.subjectmagnetic nanoparticles
dc.titleSynthesis and application of magnetic hydrogel for Cr(VI) removal from contaminated water
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentEnvironmental Nanotechnology Lab
dc.identifier.journalEnvironmental Engineering Science
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, Hong Kong
kaust.personWang, Peng


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