Application of layered double hydroxides for removal of oxyanions : a review

Layered double hydroxides (LDHs) are lamellar mixed hydroxides containing positively charged main layers and undergoing anion exchange chemistry. In recent years, many studies have been devoted to investigating the ability of LDHs to remove harmful oxyanions such as arsenate, chromate, phosphate, et...

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Main Authors: Goh, Kok Hui, Lim, Teik-Thye, Dong, Zhili
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/96770
http://hdl.handle.net/10220/9959
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-967702020-03-07T11:43:33Z Application of layered double hydroxides for removal of oxyanions : a review Goh, Kok Hui Lim, Teik-Thye Dong, Zhili School of Civil and Environmental Engineering DRNTU::Engineering::Environmental engineering Layered double hydroxides (LDHs) are lamellar mixed hydroxides containing positively charged main layers and undergoing anion exchange chemistry. In recent years, many studies have been devoted to investigating the ability of LDHs to remove harmful oxyanions such as arsenate, chromate, phosphate, etc. from contaminated waters by both surface adsorption and anion exchange of the oxyanions for interlayer anions in the LDH structure. This review article provides an overview of the LDH synthesis methods, the LDH characterization techniques, and the recent advancement that has been achieved in oxyanion removal using LDHs, highlighting areas of consensus and currently unresolved issues. Experimental studies relating to the sorption behaviors of LDHs with various oxyanions, and the kinetic models adopted to explain the adsorption rate of oxyanions from aqueous solution onto LDHs, have been comprehensively reviewed. This review discusses several key factors such as pH, competitive anions, temperature, etc., that influence the oxyanion adsorption on LDHs. The reusability of LDHs is discussed and some mechanistic studies of oxyanion adsorption on LDHs are highlighted. The sorption capacities of LDHs for various oxyanions are also compared with those of other adsorbents. In addition, this review critically identifies the shortcomings in current research on LDHs, such as the common weaknesses in the adopted methodology, discrepancies among reported results and ambiguous conclusions. Possible improvement of LDHs and potential areas for future application of LDHs are also proposed. Accepted version 2013-05-22T03:42:14Z 2019-12-06T19:34:54Z 2013-05-22T03:42:14Z 2019-12-06T19:34:54Z 2007 2007 Journal Article Goh, K. H., Lim, T. T., & Dong, Z. (2007). Application of layered double hydroxides for removal of oxyanions: a review. Water Research, 42(6-7), 1343-1368. 0043-1354 https://hdl.handle.net/10356/96770 http://hdl.handle.net/10220/9959 10.1016/j.watres.2007.10.043 en Water research © 2007 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Water Research, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.watres.2007.10.043] application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering
spellingShingle DRNTU::Engineering::Environmental engineering
Goh, Kok Hui
Lim, Teik-Thye
Dong, Zhili
Application of layered double hydroxides for removal of oxyanions : a review
description Layered double hydroxides (LDHs) are lamellar mixed hydroxides containing positively charged main layers and undergoing anion exchange chemistry. In recent years, many studies have been devoted to investigating the ability of LDHs to remove harmful oxyanions such as arsenate, chromate, phosphate, etc. from contaminated waters by both surface adsorption and anion exchange of the oxyanions for interlayer anions in the LDH structure. This review article provides an overview of the LDH synthesis methods, the LDH characterization techniques, and the recent advancement that has been achieved in oxyanion removal using LDHs, highlighting areas of consensus and currently unresolved issues. Experimental studies relating to the sorption behaviors of LDHs with various oxyanions, and the kinetic models adopted to explain the adsorption rate of oxyanions from aqueous solution onto LDHs, have been comprehensively reviewed. This review discusses several key factors such as pH, competitive anions, temperature, etc., that influence the oxyanion adsorption on LDHs. The reusability of LDHs is discussed and some mechanistic studies of oxyanion adsorption on LDHs are highlighted. The sorption capacities of LDHs for various oxyanions are also compared with those of other adsorbents. In addition, this review critically identifies the shortcomings in current research on LDHs, such as the common weaknesses in the adopted methodology, discrepancies among reported results and ambiguous conclusions. Possible improvement of LDHs and potential areas for future application of LDHs are also proposed.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Goh, Kok Hui
Lim, Teik-Thye
Dong, Zhili
format Article
author Goh, Kok Hui
Lim, Teik-Thye
Dong, Zhili
author_sort Goh, Kok Hui
title Application of layered double hydroxides for removal of oxyanions : a review
title_short Application of layered double hydroxides for removal of oxyanions : a review
title_full Application of layered double hydroxides for removal of oxyanions : a review
title_fullStr Application of layered double hydroxides for removal of oxyanions : a review
title_full_unstemmed Application of layered double hydroxides for removal of oxyanions : a review
title_sort application of layered double hydroxides for removal of oxyanions : a review
publishDate 2013
url https://hdl.handle.net/10356/96770
http://hdl.handle.net/10220/9959
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