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Article Dans Une Revue Journal of Colloid and Interface Science Année : 2023

Rare earth elements interaction with iron-organic matter colloids as a control of the REE environmental dissemination

Yasaman Tadayon
Julien Gigault
Aline Dia

Résumé

Rare earth elements (REE) are highly sought after for advanced technology, in response concerns about their environmental impact have arisen. The mobility and transport of REEs are influenced by their binding to solid surfaces, particularly colloids. With the widespread occurrence of REEs and their potential increase due to climate change, there is growing interest in understanding colloids composed of organic matter (OM) and iron (Fe). The reactivity of these colloids depends on their structural organization and the availability of Fe phase and OM binding sites. The effect of pH on the binding and mobility of REEs in these colloids in response to structural modification of Fe-OM colloids was investigated. REEs are primarily bind to the OM component of Fe-OM colloids, and their mobility is controlled by the response of OM colloids and molecules to pH conditions. At pH 6, the solubilization of small organic colloids (<3 kDa) control the REE pattern and subsequent speciation and mobility. In contrast, at pH 4, Fe-OM colloids bind less amount of REE but aggregate to form a large network. While most REEs remain soluble, those bound to Fe-OM colloids are expected to be immobilized through settlement or trapping in soil and sediment pores.This study supports the idea that colloids control the REE speciation and subsequent dissemination. The findings are particularly relevant for assessing the fate and ecotoxicology of REE in response to changing environmental conditions and increasing REE concentration in natural systems.
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Origine : Publication financée par une institution
Licence : CC BY - Paternité

Dates et versions

insu-04267744 , version 1 (02-11-2023)
insu-04267744 , version 2 (11-04-2024)

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Paternité

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Citer

Yasaman Tadayon, Delphine Vantelon, Julien Gigault, Aline Dia, Maxime Pattier, et al.. Rare earth elements interaction with iron-organic matter colloids as a control of the REE environmental dissemination. Journal of Colloid and Interface Science, 2023, 655, pp.70-79. ⟨10.1016/j.jcis.2023.10.110⟩. ⟨insu-04267744v2⟩
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