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

Handle URI:
http://hdl.handle.net/10754/561583
Title:
Synthesis and application of magnetic hydrogel for Cr(VI) removal from contaminated water
Authors:
Tang, Samuel C N; Wang, Peng ( 0000-0003-0856-0865 ) ; Yin, Ke; Lo., Irene Man Chi
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.
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
Publisher:
Mary Ann Liebert
Journal:
Environmental Engineering Science
Issue Date:
Nov-2010
DOI:
10.1089/ees.2010.0112
Type:
Article
ISSN:
10928758
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorTang, Samuel C Nen
dc.contributor.authorWang, Pengen
dc.contributor.authorYin, Keen
dc.contributor.authorLo., Irene Man Chien
dc.date.accessioned2015-08-02T09:14:44Zen
dc.date.available2015-08-02T09:14:44Zen
dc.date.issued2010-11en
dc.identifier.issn10928758en
dc.identifier.doi10.1089/ees.2010.0112en
dc.identifier.urihttp://hdl.handle.net/10754/561583en
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.en
dc.publisherMary Ann Lieberten
dc.subjectadsorbenten
dc.subjectchromiumen
dc.subjecthydrogelen
dc.subjection exchangeen
dc.subjectmagnetic nanoparticlesen
dc.titleSynthesis and application of magnetic hydrogel for Cr(VI) removal from contaminated wateren
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Nanotechnology Laben
dc.identifier.journalEnvironmental Engineering Scienceen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, Hong Kongen
kaust.authorWang, Pengen
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