Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration

The scenario of released nanoparticles from consumer products into the environment especially natural waters has become a great concern nowadays. Assessing their aggregation and stability under environmental conditions is important in determining their fate and behavior in natural waters. The aggreg...

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Main Authors:	Nur Suraya Ahmad, Shahidan Radiman, Wan Zuhairi Wan Yaacob
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2019
Online Access:	http://journalarticle.ukm.my/13097/ http://journalarticle.ukm.my/13097/ http://journalarticle.ukm.my/13097/1/22%20Nur%20Suraya%20Ahmad.pdf

id	ukm-13097
recordtype	eprints
spelling	ukm-130972019-06-22T00:26:28Z http://journalarticle.ukm.my/13097/ Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration Nur Suraya Ahmad, Shahidan Radiman, Wan Zuhairi Wan Yaacob, The scenario of released nanoparticles from consumer products into the environment especially natural waters has become a great concern nowadays. Assessing their aggregation and stability under environmental conditions is important in determining their fate and behavior in natural waters. The aggregation behavior of selected nanoparticles (iron oxide and alumina) was investigated at variable concentrations of humic acid (5, 10, 50 mg/L), and pH variation in solution. Dynamic light scattering was used to measure their z-average hydrodynamic diameter and zeta potential. Derjaguin-Landau-Verwey-Overbeak (DLVO) theory was used to explain the thermodynamic interactions between two particles. Then, the stability was evaluated by assessing their aggregation. The increasing of humic acid concentrations enhanced aggregation of iron oxide and alumina nanoparticles, particularly at low pH levels. The maximum aggregation was found in pH below the point of zero charge (PZC) due to electrostatic destabilization and electrostatic stabilization that took place at pH above the point of zero charge. Meanwhile, at pH point of zero charge, nanoparticles were coated with negative humic acid charged. From this study, properties of nanoparticles (size, surface charge, Hamaker constant) and environmental condition (humic acid concentration, pH) have their specific roles to control the fate and behavior of nanoparticles in environmental media. Penerbit Universiti Kebangsaan Malaysia 2019-02 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/13097/1/22%20Nur%20Suraya%20Ahmad.pdf Nur Suraya Ahmad, and Shahidan Radiman, and Wan Zuhairi Wan Yaacob, (2019) Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration. Sains Malaysiana, 48 (2). pp. 435-442. ISSN 0126-6039 http://www.ukm.my/jsm/malay_journals/jilid48bil2_2019/KandunganJilid48Bil2_2019.html
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	The scenario of released nanoparticles from consumer products into the environment especially natural waters has become a great concern nowadays. Assessing their aggregation and stability under environmental conditions is important in determining their fate and behavior in natural waters. The aggregation behavior of selected nanoparticles (iron oxide and alumina) was investigated at variable concentrations of humic acid (5, 10, 50 mg/L), and pH variation in solution. Dynamic light scattering was used to measure their z-average hydrodynamic diameter and zeta potential. Derjaguin-Landau-Verwey-Overbeak (DLVO) theory was used to explain the thermodynamic interactions between two particles. Then, the stability was evaluated by assessing their aggregation. The increasing of humic acid concentrations enhanced aggregation of iron oxide and alumina nanoparticles, particularly at low pH levels. The maximum aggregation was found in pH below the point of zero charge (PZC) due to electrostatic destabilization and electrostatic stabilization that took place at pH above the point of zero charge. Meanwhile, at pH point of zero charge, nanoparticles were coated with negative humic acid charged. From this study, properties of nanoparticles (size, surface charge, Hamaker constant) and environmental condition (humic acid concentration, pH) have their specific roles to control the fate and behavior of nanoparticles in environmental media.
format	Article
author	Nur Suraya Ahmad, Shahidan Radiman, Wan Zuhairi Wan Yaacob,
spellingShingle	Nur Suraya Ahmad, Shahidan Radiman, Wan Zuhairi Wan Yaacob, Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration
author_facet	Nur Suraya Ahmad, Shahidan Radiman, Wan Zuhairi Wan Yaacob,
author_sort	Nur Suraya Ahmad,
title	Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration
title_short	Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration
title_full	Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration
title_fullStr	Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration
title_full_unstemmed	Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration
title_sort	aggregation and stability of iron oxide and alumina nanoparticles: influences of ph and humic acid concentration
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2019
url	http://journalarticle.ukm.my/13097/ http://journalarticle.ukm.my/13097/ http://journalarticle.ukm.my/13097/1/22%20Nur%20Suraya%20Ahmad.pdf
first_indexed	2023-09-18T20:04:05Z
last_indexed	2023-09-18T20:04:05Z
_version_	1777407041988460544

Aggregation and stability of iron oxide and alumina nanoparticles: influences of pH and humic acid concentration

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