Aging and reactivity assessment of nanoscale zerovalent iron in groundwater systems - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Water Research Année : 2022

Aging and reactivity assessment of nanoscale zerovalent iron in groundwater systems

Résumé

In this study, changes in the reactivity of nanoscale zerovalent iron (NZVI) in five different groundwater (GW) systems under anoxic and oxic conditions were examined over a wide range of aging time (0−60 d). p-nitrophenol (p-NP) was used as a redox-sensitive probe, whereas nalidixic acid (NA), a typical antibiotic found in the natural environment, was used as a sorbing compound. Investigation of the p-NP reduction in pure water systems showed that NZVI lost 41% and 98% of its reductive activity under anoxic and oxic conditions after 60 d, while enhancement of its reactivity was observed after short-term aging in GW (1−5 d), followed by a further decline. This behavior has been ascribed to the formation of secondary Fe(II)-bearing phases, including magnetite and green rust, resulting from NZVI aging in GW. Adsorption experiments revealed that GW-anoxic-aged NZVI samples exhibited a good affinity toward NA, and a greater NA adsorption (∼27 µmol g−1) than that of pristine NZVI (∼2 µmol g−1) at alkaline pH values. Surface complexation modeling showed that the enhanced adsorption of NA onto secondary minerals can be attributed to the Fe(II)-NA surface complexation. This considerable change in the reductive ability and the adsorption capacity of NZVI arising from groundwater corrosion calls for greater attention to be paid in assessment studies, where NZVI is injected for long-term remediation in groundwater.

Domaines

Chimie
Fichier principal
Vignette du fichier
Revised ms clean.pdf (1023.38 Ko) Télécharger le fichier
Revised SI.pdf (864.97 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03897714 , version 1 (09-02-2023)

Identifiants

Citer

Junmin Deng, Tao Chen, Yara Arbid, Mathieu Pasturel, Sungjun Bae, et al.. Aging and reactivity assessment of nanoscale zerovalent iron in groundwater systems. Water Research, 2022, pp.119472. ⟨10.1016/j.watres.2022.119472⟩. ⟨hal-03897714⟩
12 Consultations
44 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More