Mobility and transformation of CdSe/ZnS quantum dots in soil: Role of the capping ligands and ageing effect
Andrea Carboni
(1, 2)
,
Alexandre Gélabert
(1)
,
Gaëlle Charron
(3)
,
Stéphane Faucher
(4)
,
Gaetane Lespes
(4)
,
Yann Sivry
(1)
,
Marc F. Benedetti
(5, 1)
1
IPGP (UMR_7154) -
Institut de Physique du Globe de Paris
2 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
3 MSC - Matière et Systèmes Complexes
4 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
5 LGE - Laboratoire de géochimie des Eaux
2 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
3 MSC - Matière et Systèmes Complexes
4 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
5 LGE - Laboratoire de géochimie des Eaux
Andrea Carboni
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- Fonction : Auteur correspondant
- PersonId : 1069085
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Gaëlle Charron
- Fonction : Auteur
- PersonId : 1237973
- IdHAL : gaellecharron
Stéphane Faucher
- Fonction : Auteur
- PersonId : 14699
- IdHAL : stephane-faucher
- ORCID : 0000-0001-8887-6055
- IdRef : 176662707
Gaetane Lespes
- Fonction : Auteur
- PersonId : 14692
- IdHAL : gaetane-lespes
- ORCID : 0000-0002-1752-8923
- IdRef : 060368454
Marc F. Benedetti
- Fonction : Auteur
- PersonId : 181021
- IdHAL : marc-f-benedetti
- ORCID : 0000-0003-1075-8205
- IdRef : 032902832
Résumé
The increasing application of Quantum Dots (QDs) is cause of concern for the potential negative effects for the ecosystem, especially in soils that may act as a sink. In this study, soil leaching experiments were performed in quartz sand packed columns to investigate the behavior of core-shell CdSe/ZnS QDs coated with either small ligands (TGA-QDs) or more complex polymers (POAMA-QDs). Fluorescence emission was compared to mass spectrometric measurements to assess the nanoparticles (NPs) state in both the leachate (transported species) and porous media (deposited amounts). Although both QDs were strongly retained in the column, large differences were observed depending on their capping ligand stability. Specifically, for TGA-QDs elution was negligible and the retained fraction accumulated in the top-columns. Furthermore, 74% of the NPs were degraded and 38% of the Se was found in the leachate in non-NPs state. Conversely, POAMA-QDs were recovered to a larger extent (78.1%), and displayed a higher transport along the soil profile. Further experiments with altered NPs showed that homo-aggregation of the QDs prior injection determined a reduced mobility but no significant changes in their stability. Eventually, ageing of the NPs in the column (15 days) caused the disruption of up to 92% of the original QDs and the immobilization of NPs and metals. These results indicate that QDs will accumulate in top-soils, where transformations phenomena will determine the overall transport, persistency and degradation of these chemicals. Once accumulated, they may act as a source for potentially toxic Cd and Se metal species displaying enhanced mobility.
Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Résumé |
en
The increasing application of Quantum Dots (QDs) is cause of concern for the potential negative effects for the ecosystem, especially in soils that may act as a sink. In this study, soil leaching experiments were performed in quartz sand packed columns to investigate the behavior of core-shell CdSe/ZnS QDs coated with either small ligands (TGA-QDs) or more complex polymers (POAMA-QDs). Fluorescence emission was compared to mass spectrometric measurements to assess the nanoparticles (NPs) state in both the leachate (transported species) and porous media (deposited amounts). Although both QDs were strongly retained in the column, large differences were observed depending on their capping ligand stability. Specifically, for TGA-QDs elution was negligible and the retained fraction accumulated in the top-columns. Furthermore, 74% of the NPs were degraded and 38% of the Se was found in the leachate in non-NPs state. Conversely, POAMA-QDs were recovered to a larger extent (78.1%), and displayed a higher transport along the soil profile. Further experiments with altered NPs showed that homo-aggregation of the QDs prior injection determined a reduced mobility but no significant changes in their stability. Eventually, ageing of the NPs in the column (15 days) caused the disruption of up to 92% of the original QDs and the immobilization of NPs and metals. These results indicate that QDs will accumulate in top-soils, where transformations phenomena will determine the overall transport, persistency and degradation of these chemicals. Once accumulated, they may act as a source for potentially toxic Cd and Se metal species displaying enhanced mobility.
|
Titre |
en
Mobility and transformation of CdSe/ZnS quantum dots in soil: Role of the capping ligands and ageing effect
|
Auteur(s) |
Andrea Carboni
1, 2
, Alexandre Gélabert
1
, Gaëlle Charron
3
, Stéphane Faucher
4
, Gaetane Lespes
4
, Yann Sivry
1
, Marc F. Benedetti
5, 1
1
IPGP (UMR_7154) -
Institut de Physique du Globe de Paris
( 1005035 )
- 1 rue Jussieu, 75238 Paris cedex 05 et Bât. Lamarck A case postale 7011, 75205 Paris CEDEX 13
- France
2
CEREGE -
Centre européen de recherche et d'enseignement des géosciences de l'environnement
( 1002357 )
- Europôle Méditerranéen de l'Arbois - Avenue Louis Philibert - BP 80 - 13545 Aix-en-Provence cedex 4
- France
3
MSC -
Matière et Systèmes Complexes
( 1004853 )
- Université Paris Diderot, Bât. Condorcet, case postale 7056, 10 rue Alice Domon et Léonie Duquet, 75205 PARIS Cedex 13
- France
4
IPREM -
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
( 483835 )
- UNIVERSITE DE PAU ET DES PAYS DE L'ADOUR, Hélioparc Pau Pyrénées, 2 avenue du Président Angot, 64053 PAU CEDEX 9
- France
5
LGE -
Laboratoire de géochimie des Eaux
( 43029 )
- Université Paris Diderot - case 7052 - 35 Rue Hélène Brion - 75205 Paris Cedex 13 France / IPGP, Boîte 89 - 1, rue Cuvier - 75252 Paris Cedex 05 - France
- France
|
Date de publication électronique |
2020-04-22
|
Licence |
Paternité - Pas d'utilisation commerciale
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2020-09
|
Volume |
254
|
Page/Identifiant |
126868
|
Financement |
|
Domaine(s) |
|
Projet(s) ANR |
|
DOI | 10.1016/j.chemosphere.2020.126868 |
PII | S0045-6535(20)31061-4 |
Origine :
Fichiers produits par l'(les) auteur(s)
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