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Nanomaterials 2016, 6(2), 25; doi:10.3390/nano6020025

Composites of Quasi-Colloidal Layered Double Hydroxide Nanoparticles and Agarose Hydrogels for Chromate Removal

Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University, Wonju, Gangwondo 26493, Korea
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Marek Osinski
Received: 30 November 2015 / Revised: 12 January 2016 / Accepted: 21 January 2016 / Published: 26 January 2016
(This article belongs to the Special Issue Current Trends in Colloidal Nanocrystals)
View Full-Text   |   Download PDF [1487 KB, uploaded 26 January 2016]   |  

Abstract

Composite hydrogels were prepared that consisted of quasi-colloidal layered double hydroxide (LDH) nanoparticles and agarose via the electrophoretic method, starting from three different agarose concentrations of 0.5, 1, and 2 wt/v%. The composite hydrogel was identified to have a uniform distribution of LDH nanoparticles in agarose matrix. Microscopic studies revealed that the composite hydrogel had a homogeneous quasi-colloidal state of LDHs, while the simple mixture of LDH powder and agarose hydrogels did not. It was determined that agarose concentration of the starting hydrogel did not significantly influence the amount of LDH that developed in the composite. The chromate scavenging efficiency of the composite hydrogel and corresponding agarose or mixture hydrogel was evaluated with respect to time, and chromate concentration. In general, the composite hydrogels exhibited much higher chromate removal efficacy compared with agarose or mixture hydrogels. Through estimating chromate adsorption by LDH moiety in the composite or mixture hydrogel, it was suggested that the agarose component facilitated the stability and dispersibility of the quasi-colloidal state of LDH nanoparticles in the composite resulting in high adsorption efficacy. From Freundlich isotherm adsorption fitting, composites were determined to possess beneficial cooperative adsorption behavior with a high adsorption coefficient. View Full-Text
Keywords: quasi-colloidal nanoparticle; electrophoretic method; layered double hydroxide; agarose; hydrogel; chromate removal; Freundlich adsorption quasi-colloidal nanoparticle; electrophoretic method; layered double hydroxide; agarose; hydrogel; chromate removal; Freundlich adsorption
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gwak, G.-H.; Kim, M.-K.; Oh, J.-M. Composites of Quasi-Colloidal Layered Double Hydroxide Nanoparticles and Agarose Hydrogels for Chromate Removal. Nanomaterials 2016, 6, 25.

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