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The effect of ionic strength, pH and natural organic matter on heteroaggregation of CeO₂ nanoparticles with montmorillonite clay minerals
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Type
Academic journal
Author
Sujin Bae (Korea Institute of Toxicology) John J. Lenhart (The Ohio State University) Yu Sik Hwang (Korea Institute of Toxicology)
Journal
Korean Society Of Environmental Engineers Environmental Engineering Research Vol.27 No.6 KCI Accredited Journals SCIE
Published
2022.12
Pages
157 - 163 (7page)

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The effect of ionic strength, pH and natural organic matter on heteroaggregation of CeO₂ nanoparticles with montmorillonite clay minerals
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Research history (5)

2022

The effect of ionic strength, pH and natural organic matter on heteroaggregation of CeO₂ nanoparticles with montmorillonite clay minerals
Sujin Bae ,  John J. Lenha ,  t and others 1 Environmental Engineering Research 2022.12 Academic journal

2015

Mobility of silver nanoparticles in saturated porous media : The effects of ionic strength, pH and clay
Sujin Bae ,  Yu Sik Hwang 환경독성보건학회 심포지엄 및 학술대회 2015.06 Proceeding

2014

Heteroaggregation of CeO₂ nanoparticles with clay minerals in aqueous system : The effect of pH and NOM
Sujin Bae ,  Myunghee Lim ,  Yu Sik Hwang 환경독성보건학회 심포지엄 및 학술대회 2014.05 Proceeding

2013

Effect of ionic strength and pH on aggregation of metal oxide nanoparticles
Sujin Bae ,  Myunghee Lim ,  Yu Sik Hwang 환경독성보건학회 심포지엄 및 학술대회 2013.10 Proceeding

2012

Effects of ionic strength, pH and natural organic matter on aggregation of TiO2 nanoparticles
Sujin Bae ,  Yong-Ju Lee ,  Sung-Kyu Lee and others 1 환경독성보건학회 심포지엄 및 학술대회 2012.10 Proceeding
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Abstract· Keywords

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An accurate assessment of the fate and transport of engineered nanoparticles (ENPs) in aquatic environments hinges on developing an understanding of interaction between ENPs and natural colloids. In this study, we investigated the effects of pH and natural organic matter (NOM) on homoaggregation of CeO₂ nanoparticles and their heteroaggregation with montmorillonite clay minerals. Time-resolved dynamic light scattering (TR-DLS) was employed to investigate the aggregation kinetics as function of electrolyte concentration in both homo- and heteroaggregation scenarios. The surface charge of CeO₂ nanoparticles changed from positive to negative with pH increase while montmorillonite was negatively charged over the range of pH 4−11. At low pH, the critical coagulation concentration (CCC) of the montmorillonite-CeO₂ mixtures shifted to a lower electrolyte concentration when compared to the homogenous system, indicating the negatively charged montmorillonite reduced the stability of positively charged CeO₂ via heteroaggregation. In contrast, at high pH, the mixtures were stable because both montmorillonite and CeO₂ nanoparticles were negatively charged. The presence of humic acid stabilized the systems against homo- and heteroaggregation. Our results suggest that the complex interactions between ENPs, natural colloids, and NOM should be considered to better understand the fate and transport of ENPs in realistic aquatic environments.
#CeO₂ nanoparticle #Heteroaggregation #Homoaggregation #Montmorillonite #Natural organic matter

Contents

ABSTRACT
1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
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