Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)

Gray-Wannell, Nia; Holliman, Peter; Greenwell, H. Christopher; Delbos, Evelyne; Hillier, Stephen

doi:10.1180/clm.2020.24

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Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)

Nia Gray-Wannell, Peter Holliman

, H. Christopher Greenwell, Evelyne Delbos, Stephen Hillier

Clay Minerals, Volume: 55, Issue: 2, Pages: 184 - 193

Swansea University Author: Peter Holliman

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DOI (Published version): 10.1180/clm.2020.24

Abstract

The adsorption and retention of phosphates in soil systems is of wide environmental importance, and understanding the surface chemistry of halloysite (a common soil clay mineral) is also of prime importance in many emerging technological applications of halloysite nanotubes (HNTs). The adsorption of...

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Published in:	Clay Minerals
ISSN:	0009-8558 1471-8030
Published:	Mineralogical Society 2020
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa55534
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first_indexed	2020-10-28T09:27:32Z
last_indexed	2020-12-05T04:09:40Z
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spelling	2020-12-04T17:48:15.6541790 v2 55534 2020-10-28 Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs) c8f52394d776279c9c690dc26066ddf9 0000-0002-9911-8513 Peter Holliman Peter Holliman true false 2020-10-28 MTLS The adsorption and retention of phosphates in soil systems is of wide environmental importance, and understanding the surface chemistry of halloysite (a common soil clay mineral) is also of prime importance in many emerging technological applications of halloysite nanotubes (HNTs). The adsorption of phosphate anions on tubular halloysite (7 Å) has been studied to gain a greater understanding of the mechanism and kinetics of adsorption on the surface of HNTs. Two well-characterized tubular halloysites with differing morphologies have been studied: one polygonal prismatic and one cylindrical, where the cylindrical form has a greater surface area and shorter tube length. Greater phosphate adsorption of up to 42 μmol g–1 is observed on the cylindrical halloysite when compared to the polygonal prismatic sample, where adsorption reached a maximum of just 15 μmol g–1 compared to a value for platy kaolinite (KGa-2) of 8 μmol g–1. Phosphate adsorption shows strong pH dependence, and the differences in phosphate sorption between the prismatic and cylindrical morphologies suggest that phosphate absorption does not occur at the same pH-dependent alumina edge sites and that the lumen may have a greater influence on uptake for the cylindrical form. Journal Article Clay Minerals 55 2 184 193 Mineralogical Society 0009-8558 1471-8030 adsorption, anion-exchange capacity, halloysite nanotube, HNT, phosphate 12 11 2020 2020-11-12 10.1180/clm.2020.24 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-12-04T17:48:15.6541790 2020-10-28T09:25:29.6401155 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Nia Gray-Wannell 1 Peter Holliman 0000-0002-9911-8513 2 H. Christopher Greenwell 3 Evelyne Delbos 4 Stephen Hillier 5 55534__18516__16a4a94817774e7b87ea6ca5e02b9831.pdf 55534.pdf 2020-10-28T09:27:00.6557691 Output 557976 application/pdf Version of Record true © The Author(s), 2020. This is an Open Access article, distributed under the terms of the Creative Commons Attribution license true eng http://creativecommons.org/licenses/by/4.0/
title	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)
spellingShingle	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs) Peter Holliman
title_short	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)
title_full	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)
title_fullStr	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)
title_full_unstemmed	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)
title_sort	Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)
author_id_str_mv	c8f52394d776279c9c690dc26066ddf9
author_id_fullname_str_mv	c8f52394d776279c9c690dc26066ddf9_***_Peter Holliman
author	Peter Holliman
author2	Nia Gray-Wannell Peter Holliman H. Christopher Greenwell Evelyne Delbos Stephen Hillier
format	Journal article
container_title	Clay Minerals
container_volume	55
container_issue	2
container_start_page	184
publishDate	2020
institution	Swansea University
issn	0009-8558 1471-8030
doi_str_mv	10.1180/clm.2020.24
publisher	Mineralogical Society
college_str	Faculty of Science and Engineering
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hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str	1
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description	The adsorption and retention of phosphates in soil systems is of wide environmental importance, and understanding the surface chemistry of halloysite (a common soil clay mineral) is also of prime importance in many emerging technological applications of halloysite nanotubes (HNTs). The adsorption of phosphate anions on tubular halloysite (7 Å) has been studied to gain a greater understanding of the mechanism and kinetics of adsorption on the surface of HNTs. Two well-characterized tubular halloysites with differing morphologies have been studied: one polygonal prismatic and one cylindrical, where the cylindrical form has a greater surface area and shorter tube length. Greater phosphate adsorption of up to 42 μmol g–1 is observed on the cylindrical halloysite when compared to the polygonal prismatic sample, where adsorption reached a maximum of just 15 μmol g–1 compared to a value for platy kaolinite (KGa-2) of 8 μmol g–1. Phosphate adsorption shows strong pH dependence, and the differences in phosphate sorption between the prismatic and cylindrical morphologies suggest that phosphate absorption does not occur at the same pH-dependent alumina edge sites and that the lumen may have a greater influence on uptake for the cylindrical form.
published_date	2020-11-12T04:09:49Z
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score	11.013148

Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)

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