Skip to Main content Skip to Navigation
Journal articles

Adsorption capacity of the corrosion products of nanoscale zerovalent iron towards emerging contaminants

Abstract : Despite the extensive use of nanoscale zerovalent iron (NZVI) in water and soilremediation, no data exist on the reactivity of secondary iron minerals formed upon theNZVI corrosion. Herein, we investigated the oxidation kinetics of NZVI by monitoringthe variations of pH, oxidation−reduction potential (ORP) and dissolved Fe(II)concentration, and then examined the reactivity of resulting oxidized particles for theadsorption of an emerging contaminant (nalidixic acid (NA)). NA adsorption was foundgreatest onto oxidized particles and negligible on the fresh NZVI. Interestingly, theformed secondary mineral phases exhibited an unusual pH adsorption-curve with anunexpected great adsorption at alkaline pH values. X-ray photoelectron spectroscopyand high resolution-transmission electron microscopy revealed a gradual increase inFe(II) content at the surface of magnetite phase over the reaction time. Additionalexperiments and surface complexation modeling showed that the enhanced adsorptionof NA onto the secondary magnetite is due to the formation of surface bound Fe(II).Fe(II) release into solution because, for instance, of the presence of organic buffermolecules, decreased surface Fe(II) and then NA adsorption at alkaline pH values. Thiswork sheds light on an overseen aspect of the reactivity of secondary iron mineralsresulting from NZVI passivation, which can bind co-exiting emerging contaminantsand then affect their fate in the environment.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-02986605
Contributor : Laurent Jonchère <>
Submitted on : Friday, December 18, 2020 - 3:07:37 PM
Last modification on : Wednesday, April 7, 2021 - 3:18:14 PM

File

Deng et al-Adsorption capacity...
Files produced by the author(s)

Identifiers

Citation

Junmin Deng, Sungjun Bae, Sunho Yoon, Mathieu Pasturel, Remi Marsac, et al.. Adsorption capacity of the corrosion products of nanoscale zerovalent iron towards emerging contaminants. Environmental science‎.Nano, Royal Society of Chemistry, 2020, 7 (12), pp.3773-3782. ⟨10.1039/d0en00886a⟩. ⟨insu-02986605v2⟩

Share

Metrics

Record views

105

Files downloads

9