Effects of pH and fulvic acids concentration on the stability of fulvic acids - cerium (IV) oxide nanoparticle complexes

Chemosphere
Olena Oriekhova, Serge Stoll

Abstract

The behavior of cerium (IV) oxide nanoparticles has been first investigated at different pH conditions. The point of zero charge was determined as well as the stability domains using dynamic light scattering, nanoparticle tracking analysis and scanning electron microscopy. A baseline hydrodynamic diameter of 180 nm was obtained indicating that individual CeO2 nanoparticles are forming small aggregates. Then we analyzed the particle behavior at variable concentrations of fulvic acids for three different pH-electrostatic scenarios corresponding to positive, neutral and negative CeO2 surface charges. The presence of fulvic acids was found to play a key role on the CeO2 stability via the formation of electrostatic complexes. It was shown that a small amount of fulvic acids (2 mg L(-1)), representative of environmental fresh water concentrations, is sufficient to stabilize CeO2 nanoparticles (50 mg L(-1)). When electrostatic complexes are formed between negatively charged FAs and positively charged CeO2 NPs the stability of such complexes is obtained with time (up to 7 weeks) as well as in pH changing conditions. Based on zeta potential variations we also found that the fulvic acids are changing the CeO2 acid-base surface properties...Continue Reading

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Citations

May 20, 2017·Angewandte Chemie·Stefan SchymuraKarsten Franke
Feb 13, 2018·Environmental Science and Pollution Research International·Mohamed BaaloushaPhilippe Le Coustumer
Jul 31, 2021·The Science of the Total Environment·Jejal Reddy BathiVenkataramana Gadhamshetty
Aug 27, 2019·Environmental Science & Technology·Logan N Rand, James F Ranville
Oct 6, 2021·Journal of Basic Microbiology·Peraman MuthukumaranJeyaseelan Aravind

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