Immobilizing magnetite onto quartz sand for chromium remediation.
Abiogenic
Biogenic
Coating
Nanoparticles
Sorption
Journal
Journal of hazardous materials
ISSN: 1873-3336
Titre abrégé: J Hazard Mater
Pays: Netherlands
ID NLM: 9422688
Informations de publication
Date de publication:
05 12 2020
05 12 2020
Historique:
received:
07
02
2020
revised:
02
06
2020
accepted:
04
06
2020
pubmed:
22
6
2020
medline:
22
6
2020
entrez:
22
6
2020
Statut:
ppublish
Résumé
Magnetite nanoparticles are often promoted as remediation agents for heavy metals such as chromium due to their reactivity and high surface area. However, their small size also makes them highly mobile increasing the risk that reacted pollutants will be transported to different locations rather than being safely controlled. Released to aquatic environments, aggregation leads to a loss of their nano-specific properties and contaminant-removal capacity. We immobilized magnetite onto sand to overcome these issues whilst maintaining reactivity. We compare biogenic magnetite and abiogenic magnetite coated sand against magnetite nanoparticles. Magnetite coatings mostly exhibited a Fe(II)/Fe(III) ratio close to stoichiometry (0.5). We tested the efficacy of the magnetite-coated sand to adsorb chromium, with respect to biogenic/abiogenic nanoparticles. Langmuir-type sorption of Cr(VI) onto magnetite (4.32 mM total Fe) was observed over the tested concentration range (10-1000 μM). Biogenic nanoparticles showed the highest potential for Cr(VI) removal with maximum adsorption capacity (Q
Identifiants
pubmed: 32563903
pii: S0304-3894(20)31128-6
doi: 10.1016/j.jhazmat.2020.123139
pii:
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
123139Informations de copyright
Copyright © 2020 Elsevier B.V. All rights reserved.