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Effect of Iron Nanoparticles Synthesized by a Sol-Gel Process on Rhodococcus erythropolis T902.1 for Biphenyl Degradation

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Journal of Water Resource and Protection 2015年第3期7卷 264-277页

作者： Wissal Wannoussa Thibaut Masy Stephanie D. Lambert Benoit Heinrichs ludivine tasseroul Alaaeddin Al-Ahmad Frederic Weekers Philippe Thonar Serge Hiligsmann Walloon Center of Industrial Biology Department of Chemistry and Bio-industriesUniversity of LiegeGemblouxBelgium Laboratory of Nanomaterials Catalysis and ElectrochemistryUniversity of LiegeLiegeBelgium Artechno S.A. Gembloux-Les IsnesBelgium

Nanoparticles (NPS) are considered as a new generation of compounds to improve environmental remediation and biological processes. The aim of this study is to investigate the effect of iron NPS encapsulated in porous silica (SiO2) on the biphenyl biodegradation by Rhodococcus erythropolis T902.1 (RT902.1). The iron NPS (major iron oxide FexOy form) were dispersed in the porosity of a SiO2 support synthesized by sol-gel process. These Fe/SiO2 NPS offer a stimulating effect on the biodegradation rate of biphenyl, an organic pollutant that is very stable and water-insoluble. This positive impact of NPS on the microbial biodegradation was found to be dependent on the NPS concentration ranging from 10-6 M to 10-4 M. After 18 days of incubation the cultures containing NPS 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 about 10% 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 from the porous silica matrix.

关键词： Biodegradation Biphenyl Rhodococcus erythropolis Encapsulated Nanoparticles Sol-Gel Iron

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P-Doped Titania Xerogels as Efficient UV-Visible Photocatalysts

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Journal of Materials Science and Chemical Engineering 2014年第8期2卷 17-32页

作者： Céline J.Bodson Sophie L.Pirard René Pirard ludivine tasseroul Catherine Bied Michel Wong Chi Man Benoit Heinrichs Stéphanie D.Lambert Laboratory of Chemical Engineering—Nanomaterials CatalysisElectrochemistryUniversity of LiegeLiegeBelgium Charles Gerhardt Montpellier Institute(UMR5253 CNRS-UM2-ENSCM-UM1) MontpellierFrance

In the present study, sol-gel process is used to synthesize P-doped TiO2 xerogels by the cogelation method of a functionalized P alkoxide, (NH2-(CH2)2-NH-(CH2)2-P(O)-(OC2H5)2) with Ti(OC3H7)4 in either 2-methoxyethanol or isopropanol. The phosphorus-doping improved the thermal stability of titania and decreased the phase transformation of anatase into rutile. This modification by phosphorus shifted the absorption edge of titania to the visible region as proved by Diffuse reflectance measurements, and thus offers the possibility to produce visible light effective TiO2 photocatalyst. The excellent photocatalytic activity of P-doped TiO2 xerogels compared to pure TiO2 could be explained by its high surface area and small TiO2-anatase crystallite size. From these results, it was proved by using three different models that phosphorus intrinsically influences the photocatalytic activity.

关键词： TiO_(2) xerogel Phosphorus-Doping Sol-Gel p-Nitrophenol Degradation Photocatalysis

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