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Unravelling Iron Oxide Nanoparticles (IONPs) interactions in the environment

Abstract : Either used as nano-carriers in blood, depolluting agents in groundwaters or nanofertilizers in soils engineered nanoparticles (ENPs) are prone to a growing interest that explains their multiple uses as well as their increasing industrial production. The very small size of ENPs (having at least one space dimension <100nm) gives rise to some exceptional physicochemical properties that ensue from their high reactivity. In environmental and agricultural fields, where iron oxide nanoparticles (IONPs) are particularly used, this reactivity is directly related to their adsorption capacity, which is of prime interest regarding soil contamination and soil recovery issues. Considering the peculiar role of copper (Cu) in soils, we investigated the specific relationships that exist between IONPs and Cu. Most particularly, this study aims at understanding how pH, Cu concentration and Fe3O4-NPs natural coatings drive Cu adsorption to IONPs. In a primary step, eight nm-sized Fe3O4-NPs were synthesized using a co-precipitation method and thoroughly characterized with TEM, XRD, FT-IR and BET while in a second stage Cu-adsorption tests were conducted through ultrafiltrations (<2kDa) and monitored with ICP-MS analyses. In these experiments, four types of IONPs were investigated regarding their mineralogy and the nature of their coating. They were tested with four copper concentrations (0.01, 0.05, 0.1 and 0.5mM) and five different pH values (3.5; 5; 6; 7 and 8). According to the results, un-adsorbed Cu decrease with increasing pH values and about 100% of Cu is adsorbed to IONPs at high pH values. Although the trend looks repeatable regardless NPs’ coating and Cu concentrations, each NP-type may have its typical pHpzc value and the amount of Cu adsorbed to IONPs is also likely to be related to the number of available adsorption sites.
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https://hal-insu.archives-ouvertes.fr/insu-01478356
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, February 28, 2017 - 10:18:46 AM
Last modification on : Wednesday, September 2, 2020 - 1:22:04 PM

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  • HAL Id : insu-01478356, version 1

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Edwige Demangeat, Mathieu Pédrot, Aline Dia, Francisco Cabello Hurtado, Martine Bouhnik-Le Coz, et al.. Unravelling Iron Oxide Nanoparticles (IONPs) interactions in the environment. 6th NIMS-UR1-CNRS-SG Workshop, Oct 2016, Fukuoka, Japan. ⟨insu-01478356⟩

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