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Bio -matériauxpour la rémédiationorganique etinorganique
Thibaud CoradinEquipe Matériaux et Biologie
UPMC-CNRS-Collège de France-EPHE
Chimie et environnement au LCMCP
C. Chaneac, Environ Sci technol 2006
S. Cassaignon , ChemPhysChem, 2011C. Laberty-Robert , Adv Funct Mater 2010
N. Baccile, Green Chem 2010
Piles à combustible
1.Nanostructured materials in environmental applications
� Remediation processes:
Precipitation (salts, pH)
Adsorption/filtration (porous materials)
Physical/Chemical degradation (oxydative, photochemical)
Biological degradation (living organisms)
� Nanomaterials
high specific surface area
functional surface
possible physical properties (photocatalysis)
Apatites in remediationCa10(PO4)6(OH)2
OxygenMeXY
Easy cationic and anionic exchangeOften non-stoechiometric = lacunaries
Ca2+ P
OH
P
O-
M2+
Ca2+ P
OH
P
O-
M2+ Ca2+
Heavy metal sorption
El Asri, Colloids Surf A 2010
Three main targets: use of raw materialsincreasing porositygrafting of metal-binding organics
Apatite sorbents from natural phosphate
20 m2.g-1
150 m2.g-1
El Asri, Colloids Surf A 2009
Saoiabi, Mater Lett 2011
Application to organic pollutant
phenol pyridine
Weak interaction:Low, reversible adsorption
Strong interaction:High, irreversible adsorption
El Asri, Water Res, 2009; J Hazard Mater, 2011
Apatite-metal oxide nanocompositesStabilizing apatite during recycling stepsCombining apatite and metal oxide sorption properties
Achelhi, Langmuir, in press
Cr(III) Cr(VI)
ZrO2, SiO2, TiO2…
� When exposed to metal ions, photosynthetic organisms
- associate them with phosphate
-accumulate
in the chloroplasts
2.Algal bioremediation
Wong, J Applied Phycol 2004
Case of easily-reduced metal ions: formation and release of gold nanoparticles
Brayner J Nanosci Nanotechnol 2006
Inter-species variations
Dahoumane submitted
recycling vs continuous
Dahoumane Biotechnol Bioengin,in press
immobilisation
Ramachandran, Silicon 2009Sicard, J Mater Chem 2010
BioréacteursBiocapteurs
-Applications à des milieux réels-Etude des interactions avec les organismes de l’environnement-Diagénèse des apatites substituées-Approches biologiques de la réduction métallique intracellulaire
Recherche collaborations pour…
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