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Effect of iron nanoparticles synthesized by a sol-gel process on Rhodococcus erythropolis T902.1 for biphenyl degradation

par Wannoussa, W.;Masy, T.;Lambert, S.;Heinrichs, B.;Tasseroul, L.;Al-Ahmad, A.;Weekers, Frédéric;Thonart, P.;Hiligsmann, Serge
Référence Journal of water resource and protection, 7, page (264-277)
Publication Publié, 2015

Article révisé par les pairs

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Résumé :

[en] Nanoparticles (NPS) are considered as a new generation of compounds to improve environmentalremediation and biological processes. The aim of this study is to investigate the effect of iron NPSencapsulated in porous silica (SiO2) on the biphenyl biodegradation by Rhodococcus erythropolisT902.1 (RT902.1). The iron NPS (major iron oxide FexOy form) were dispersed in the porosity of aSiO2 support synthesized by sol-gel process. These Fe/SiO2 NPS offer a stimulating effect on thebiodegradation rate of biphenyl, an organic pollutant that is very stable and water-insoluble. Thispositive impact of NPS on the microbial biodegradation was found to be dependent on the NPSconcentration ranging from 10-6 M to 10-4 M. After 18 days of incubation the cultures containingNPS at a concentration of 10-4 M of iron improved RT902.1 growth and degraded 35% more biphenyl than those without NPS (positive control) or with the sole SiO2 particles. Though the microorganism could not interact directly with the insoluble iron NPS, the results show that about10% and 35% of the initial 10-4 M iron NPS encapsulated in the SiO2 matrix would be incorporated inside or adsorbed on the cell surface respectively and 35% would be released in the supernatant.These results suggest that RT902.1 would produce siderophore-like molecules to attract iron fromthe porous silica matrix.