Stability of Fe-oxide nanoparticles coated with natural organic matter under relevant environmental conditions

Chekli, L; Phuntsho, S; Tijing, LD; Zhou, JL; Kim, JH; Shon, HK

Stability of Fe-oxide nanoparticles coated with natural organic matter under relevant environmental conditions

Chekli, L

Phuntsho, S

Tijing, LD

Zhou, JL

Kim, JH Shon, HK

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Publication Type:: Journal Article
Citation:: Water Science and Technology, 2014, 70 (12), pp. 2040 - 2046
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Chekli, L https://orcid.org/0000-0002-9353-943X	en_US
dc.contributor.author	Phuntsho, S https://orcid.org/0000-0002-3917-3916	en_US
dc.contributor.author	Tijing, LD https://orcid.org/0000-0001-9398-6355	en_US
dc.contributor.author	Zhou, JL https://orcid.org/0000-0003-1393-1608	en_US
dc.contributor.author	Kim, JH	en_US
dc.contributor.author	Shon, HK https://orcid.org/0000-0002-3777-7169	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Water Science and Technology, 2014, 70 (12), pp. 2040 - 2046	en_US
dc.identifier.issn	0273-1223	en_US
dc.identifier.uri	http://hdl.handle.net/10453/33691
dc.description.abstract	© IWA Publishing 2014 Manufactured nanoparticles (MNPs) are increasingly released into the environment and thus research on their fate and behaviour in complex environmental samples is urgently needed. The fate of MNPs in the aquatic environment will mainly depend on the physico-chemical characteristics of the medium. The presence and concentration of natural organic matter (NOM) will play a significant role on the stability of MNPs by either decreasing or exacerbating the aggregation phenomenon. In this study, we firstly investigated the effect of NOM concentration on the aggregation behaviour of manufactured Fe-oxide nanoparticles. Then, the stability of the coated nanoparticles was assessed under relevant environmental conditions. Flow field-flow fractionation, an emerging method which is gaining popularity in the field of nanotechnology, has been employed and results have been compared to another size-measurement technique to provide increased confidence in the outcomes. Results showed enhanced stability when the nanoparticles are coated with NOM, which was due to electrosteric stabilisation. However, the presence of divalent cations, even at low concentration (i.e. less than 1 mM) was found to induce aggregation of NOM-coated nanoparticles via bridging mechanisms between NOM and Ca<sup>2+</sup>.	en_US
dc.relation.ispartof	Water Science and Technology	en_US
dc.relation.isbasedon	10.2166/wst.2014.454	en_US
dc.subject.classification	Environmental Engineering	en_US
dc.subject.mesh	Oxides	en_US
dc.subject.mesh	Cations, Divalent	en_US
dc.subject.mesh	Organic Chemicals	en_US
dc.subject.mesh	Chemical Fractionation	en_US
dc.subject.mesh	Environment	en_US
dc.subject.mesh	Nanoparticles	en_US
dc.subject.mesh	Metal Nanoparticles	en_US
dc.title	Stability of Fe-oxide nanoparticles coated with natural organic matter under relevant environmental conditions	en_US
dc.type	Journal Article
utslib.citation.volume	12	en_US
utslib.citation.volume	70	en_US
utslib.for	0907 Environmental Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access
pubs.issue	12	en_US
pubs.publication-status	Published	en_US
pubs.volume	70	en_US

Abstract:

© IWA Publishing 2014 Manufactured nanoparticles (MNPs) are increasingly released into the environment and thus research on their fate and behaviour in complex environmental samples is urgently needed. The fate of MNPs in the aquatic environment will mainly depend on the physico-chemical characteristics of the medium. The presence and concentration of natural organic matter (NOM) will play a significant role on the stability of MNPs by either decreasing or exacerbating the aggregation phenomenon. In this study, we firstly investigated the effect of NOM concentration on the aggregation behaviour of manufactured Fe-oxide nanoparticles. Then, the stability of the coated nanoparticles was assessed under relevant environmental conditions. Flow field-flow fractionation, an emerging method which is gaining popularity in the field of nanotechnology, has been employed and results have been compared to another size-measurement technique to provide increased confidence in the outcomes. Results showed enhanced stability when the nanoparticles are coated with NOM, which was due to electrosteric stabilisation. However, the presence of divalent cations, even at low concentration (i.e. less than 1 mM) was found to induce aggregation of NOM-coated nanoparticles via bridging mechanisms between NOM and Ca²⁺.

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http://hdl.handle.net/10453/33691