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A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media

Ruth C. Merrifield, Kenton P. Arkill, Richard Palmer Orcid Logo, Jamie R. Lead

Environmental Science & Technology, Volume: 51, Issue: 14, Pages: 8010 - 8016

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1021/acs.est.7b01130

Abstract

Ceria nanoparticles (NPs) rapidly and easily cycle between Ce(III) and Ce(IV) oxidation states, making them prime candidates for commercial and other applications. Increased commercial use has resulted in increased discharge to the environment and increased associated risk. Once in complex media suc...

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Published in: Environmental Science & Technology
ISSN: 0013-936X 1520-5851
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa41124
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spelling 2018-07-25T09:45:03.7655079 v2 41124 2018-07-25 A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media 6ae369618efc7424d9774377536ea519 0000-0001-8728-8083 Richard Palmer Richard Palmer true false 2018-07-25 MECH Ceria nanoparticles (NPs) rapidly and easily cycle between Ce(III) and Ce(IV) oxidation states, making them prime candidates for commercial and other applications. Increased commercial use has resulted in increased discharge to the environment and increased associated risk. Once in complex media such as environmental waters or toxicology exposure media, the same redox transformations can occur, causing altered behavior and effects compared to the pristine NPs. This study used high resolution scanning transmission electron microscopy and electron energy loss spectroscopy to investigate changes in structure and oxidation state of small, polymer-coated ceria suspensions in complex media. NPs initially in either the III or IV oxidation states, but otherwise identical, were used. Ce(IV) NPs were changed to mixed (III, IV) NPs at high ionic strengths, while the presence of natural organic macromolecules (NOM) stabilized the oxidation state and increased crystallinity. The Ce(III) NPs remained as Ce(III) at high ionic strengths, but were modified by the presence of NOM, causing reduced crystallinity and degradation of the NPs. Subtle changes to NP properties upon addition to environmental or ecotoxicology media suggest that there may be small but important effects on fate and effects of NPs compared to their pristine form. Journal Article Environmental Science & Technology 51 14 8010 8016 0013-936X 1520-5851 18 7 2017 2017-07-18 10.1021/acs.est.7b01130 http://eprints.nottingham.ac.uk/46926/ COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2018-07-25T09:45:03.7655079 2018-07-25T09:36:02.0445445 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Ruth C. Merrifield 1 Kenton P. Arkill 2 Richard Palmer 0000-0001-8728-8083 3 Jamie R. Lead 4
title A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
spellingShingle A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
Richard Palmer
title_short A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
title_full A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
title_fullStr A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
title_full_unstemmed A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
title_sort A High Resolution Study of Dynamic Changes of Ce2O3 and CeO2 Nanoparticles in Complex Environmental Media
author_id_str_mv 6ae369618efc7424d9774377536ea519
author_id_fullname_str_mv 6ae369618efc7424d9774377536ea519_***_Richard Palmer
author Richard Palmer
author2 Ruth C. Merrifield
Kenton P. Arkill
Richard Palmer
Jamie R. Lead
format Journal article
container_title Environmental Science & Technology
container_volume 51
container_issue 14
container_start_page 8010
publishDate 2017
institution Swansea University
issn 0013-936X
1520-5851
doi_str_mv 10.1021/acs.est.7b01130
college_str Faculty of Science and Engineering
hierarchytype
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 Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
url http://eprints.nottingham.ac.uk/46926/
document_store_str 0
active_str 0
description Ceria nanoparticles (NPs) rapidly and easily cycle between Ce(III) and Ce(IV) oxidation states, making them prime candidates for commercial and other applications. Increased commercial use has resulted in increased discharge to the environment and increased associated risk. Once in complex media such as environmental waters or toxicology exposure media, the same redox transformations can occur, causing altered behavior and effects compared to the pristine NPs. This study used high resolution scanning transmission electron microscopy and electron energy loss spectroscopy to investigate changes in structure and oxidation state of small, polymer-coated ceria suspensions in complex media. NPs initially in either the III or IV oxidation states, but otherwise identical, were used. Ce(IV) NPs were changed to mixed (III, IV) NPs at high ionic strengths, while the presence of natural organic macromolecules (NOM) stabilized the oxidation state and increased crystallinity. The Ce(III) NPs remained as Ce(III) at high ionic strengths, but were modified by the presence of NOM, causing reduced crystallinity and degradation of the NPs. Subtle changes to NP properties upon addition to environmental or ecotoxicology media suggest that there may be small but important effects on fate and effects of NPs compared to their pristine form.
published_date 2017-07-18T03:52:25Z
_version_ 1763752590235926528
score 11.013148

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