Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles

The sorption ability of fast-coprecipitated and hydrothermally-treated Mg/Al layered double hydroxide nanoparticles (FCHT-LDH) for various oxyhalides and oxyanions was evaluated. Interactions of oxyhalide such as monovalent bromate or oxyanions such as divalent chromate and divalent vanadate with FC...

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Main Authors: Goh, Kok Hui, Lim, Teik-Thye, Banas, Agnieszka, Dong, Zhili
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2012
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Online Access:https://hdl.handle.net/10356/95449
http://hdl.handle.net/10220/8869
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-954492020-06-01T10:26:30Z Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles Goh, Kok Hui Lim, Teik-Thye Banas, Agnieszka Dong, Zhili School of Materials Science & Engineering DRNTU::Engineering::Materials The sorption ability of fast-coprecipitated and hydrothermally-treated Mg/Al layered double hydroxide nanoparticles (FCHT-LDH) for various oxyhalides and oxyanions was evaluated. Interactions of oxyhalide such as monovalent bromate or oxyanions such as divalent chromate and divalent vanadate with FCHT-LDH were investigated using a combination of macroscopic (batch sorption/desorption studies and electrophoretic mobility (EM) measurements) and microscopic techniques (CHNS/O, XRD, FTIR, XPS, and EXAFS analyses). The sorption studies on various oxyanions and oxyhalides suggested that their sorption characteristics on FCHT-LDH were largely governed by their ionic potentials and molecular structures. Oxyanions which have ionic potentials higher than 7 nm−1 were found to be more readily sorbed by FCHT-LDH than oxyhalides with ionic potentials lower than 5 nm−1. The results obtained also demonstrated that trigonal pyramid oxyhalides showed a lower degree of specificity for FCHT-LDH than the tetrahedral coordinated oxyanions. From the macroscopic and microscopic studies, monovalent oxyhalide sorption on FCHT-LDH was postulated to occur mainly via anion exchange mechanism with subsequent formation of outer-sphere surface complexes. For polyvalent oxyanion sorption on FCHT-LDH, the mechanisms were possibly associated with both anion exchange and ligand exchange reactions, resulting in the coexistence of outer-sphere and inner-sphere surface complexes. Accepted version 2012-12-12T06:40:05Z 2019-12-06T19:15:06Z 2012-12-12T06:40:05Z 2019-12-06T19:15:06Z 2010 2010 Journal Article Goh, K. H., Lim, T. T., Banas, A., & Dong, Z. (2010). Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles. Journal of Hazardous Materials, 179(1-3), 818-827. 0304-3894 https://hdl.handle.net/10356/95449 http://hdl.handle.net/10220/8869 10.1016/j.jhazmat.2010.03.077 en Journal of hazardous materials © 2010 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Hazardous Materials, Elsevier B.V. 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: [DOI:dx.doi.org/10.1016/j.jhazmat.2010.03.077]. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Goh, Kok Hui
Lim, Teik-Thye
Banas, Agnieszka
Dong, Zhili
Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
description The sorption ability of fast-coprecipitated and hydrothermally-treated Mg/Al layered double hydroxide nanoparticles (FCHT-LDH) for various oxyhalides and oxyanions was evaluated. Interactions of oxyhalide such as monovalent bromate or oxyanions such as divalent chromate and divalent vanadate with FCHT-LDH were investigated using a combination of macroscopic (batch sorption/desorption studies and electrophoretic mobility (EM) measurements) and microscopic techniques (CHNS/O, XRD, FTIR, XPS, and EXAFS analyses). The sorption studies on various oxyanions and oxyhalides suggested that their sorption characteristics on FCHT-LDH were largely governed by their ionic potentials and molecular structures. Oxyanions which have ionic potentials higher than 7 nm−1 were found to be more readily sorbed by FCHT-LDH than oxyhalides with ionic potentials lower than 5 nm−1. The results obtained also demonstrated that trigonal pyramid oxyhalides showed a lower degree of specificity for FCHT-LDH than the tetrahedral coordinated oxyanions. From the macroscopic and microscopic studies, monovalent oxyhalide sorption on FCHT-LDH was postulated to occur mainly via anion exchange mechanism with subsequent formation of outer-sphere surface complexes. For polyvalent oxyanion sorption on FCHT-LDH, the mechanisms were possibly associated with both anion exchange and ligand exchange reactions, resulting in the coexistence of outer-sphere and inner-sphere surface complexes.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Goh, Kok Hui
Lim, Teik-Thye
Banas, Agnieszka
Dong, Zhili
format Article
author Goh, Kok Hui
Lim, Teik-Thye
Banas, Agnieszka
Dong, Zhili
author_sort Goh, Kok Hui
title Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
title_short Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
title_full Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
title_fullStr Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
title_full_unstemmed Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
title_sort sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on mg/al layered double hydroxide nanoparticles
publishDate 2012
url https://hdl.handle.net/10356/95449
http://hdl.handle.net/10220/8869
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