A5071316544- Zeolite Catalysis and Synthesis
- Mesoporous Materials and Catalysis
- Catalytic Processes in Materials Science
- Metal-Organic Frameworks: Synthesis and Applications
- Photochemistry and Electron Transfer Studies
- Catalysis and Oxidation Reactions
- Advanced NMR Techniques and Applications
- Chemical Synthesis and Characterization
- Spectroscopy and Quantum Chemical Studies
- Electrocatalysts for Energy Conversion
- Radioactive element chemistry and processing
- Porphyrin and Phthalocyanine Chemistry
- Electrochemical Analysis and Applications
- Free Radicals and Antioxidants
- Advanced Photocatalysis Techniques
- Catalysis and Hydrodesulfurization Studies
- Advanced Chemical Physics Studies
- Covalent Organic Framework Applications
- Advanced Battery Materials and Technologies
- Solid-state spectroscopy and crystallography
- Analytical Chemistry and Chromatography
- Molecular Junctions and Nanostructures
- Pigment Synthesis and Properties
- Inorganic and Organometallic Chemistry
- Graphite, nuclear technology, radiation studies
Université de Lille
2014-2024
Laboratoire de Spectroscopie pour les Interactions, la Réactivité et l'Environnement
2014-2024
Centre National de la Recherche Scientifique
2014-2024
École Nationale Supérieure de Chimie de Lille
2018
University of Delaware
2010
Laboratoire de Physique des Lasers, Atomes et Molécules
2003-2007
Laboratoire de Chimie Organique
2003-2007
Centre de Gestion Scientifique
2003
Laboratoire de Spectrométrie Ionique et Moléculaire
1994-1995
Laboratoire de Chimie Physique et Microbiologie pour l'Environnement
1995
Metal-Organic Frameworks (MOFs) have gained considerable attention due to their potential applications in gas storage, separation, and catalysis. These porous materials exhibit properties of interest for semiconductor physics homogeneous photocatalysis, which concepts from coordination chemistry are often mixed. In the photocatalysis field, optical band gap semiconductors is a crucial parameter that determine functionality. Despite all MOFs, there still lack information about evaluation...
Many works reported the encapsulation of iodine in metal-organic frameworks as well I2 → I3- chemical conversion. This transformation has been examined by adsorbing gaseous on a series UiO-66 materials and different Hf/Zr metal ratios (0-100% Hf) were evaluated during evolution into I3-. The influence hafnium content structure was highlighted PXRD, SEM images, gas sorption tests. UiO-66(Hf) presented smaller lattice parameter (a = 20.7232 Å), higher crystallite size (0.18 ≤ Φ 3.33 μm),...
A series of Zr-based UiO-n MOF materials (n=66, 67, 68) have been studied for iodine capture. Gaseous adsorption was collected kinetically from a home-made set-up allowing the continuous measurement content trapped within compounds, with organic functionalities (-H, -CH3 , -Cl, -Br, -(OH)2 -NO2 -NH2 (-NH2 )2 -CH2 NH2 ) by in-situ UV-Vis spectroscopy. This study emphasizes role amino groups attached to aromatic rings ligands connecting {Zr6 O4 (OH)4 } brick. In particular, preferential...
Metal-organic frameworks (MOFs) have been largely investigated worldwide for their use in the capture of radioactive iodine due to its potential release during nuclear accident events and reprocessing fuel. The present work deals with gaseous I2 under a continuous flow subsequent transformation into I3- within porous structures three distinct, yet structurally related, terephthalate-based MOFs: MIL-125(Ti), MIL-125(Ti)_NH2, CAU-1(Al)_NH2. synthesized materials exhibited specific surface...
Two titanium-based MOFs MIL-125 and MIL-125_NH
The capture of gaseous iodine has been deeply studied for trying to mitigate the dangers nuclear power energy. UiO family metal–organic framework (MOF) materials is considered as one best candidates such purposes since it couples high specific surface areas, facility be chemically modified, great adsorption capacity, and good stability under accidents conditions. UiO-66 was profoundly evaluated in several works trapping I2 by using different linkers metal contents. A transformation molecule...
In situ FT-Raman scattering spectroscopy was used to monitor the sorption kinetics of 2,2'- and 4,4'-bipyridine in acidic ZSM-5 zeolites. The data processing all Raman spectra applied extract characteristic occluded species respective contribution generated from many spectral which resolves spectrum mixture into pure component without any prior information. assignment extracted performed according careful comparison with corresponding a set recorded during protonation or (bpy) hydrochloric...
The organized internal porous void of dehydrated zeolites provides a suitable environment to promote long-lived photoinduced charge separation. Herein we have conducted time-resolved UV–visible absorption spectroscopy experiments from nanosecond day time scale following UV (266 nm) pulsed laser irradiation trans-stilbene (t-St) occluded in channels nonacidic M–FER, M–MFI, and M–MOR with various pore diameters, differing framework aluminum content, different extraframework cations (M = Na+,...
This work reveals the crucial role of zeolite acidity in synthesis zeolite-templated carbons (ZTCs). While textural and chemical properties appear to be independent from at a given temperature, spin concentration hybrid materials appears strongly impacted by acid site concentration. The electrical conductivity hybrids resulting ZTCs are closely related materials. amount sites hence fundamentally impacts samples that spans over range four magnitudes. Electrical as key parameter describe quality ZTCs.
Green and blue ultramarine pigments are characterized by the sodalite structure Na(6)(Al(6)Si(6)O(24)) colored inserted species. These chromophores sulfur species: S(3)(-) (blue) S(2)(-) (yellow). Both radicals encapsulated inside β-cages. They contribute to EPR spectrum of pigments. The well-known strong signal observed in all Continuous-Wave (CW) spectra has long been assigned (g = 2.029). In contrast, contribution is still subject controversy because its was not resolved even at low...
Using a combination of synthetic fluid inclusions in halite, microvolume aqueous solutions and National Institute Standards Technology (NIST) Standard Reference Material (SRM) 611 Glass, calibration graphs were established for the determination elemental ratios natural by laser ablation–inductively coupled plasma mass spectrometry (ICP-MS). For simultaneous multi-element analysis, optimization studies demonstrate necessity to adopt compromise set operating conditions since ICP-MS sensitivity...
In situ diffuse reflectance UV visible and Raman scattering spectroscopies were used to monitor the spontaneous ionization of anthracene, phenanthrene 9,10-dimethylanthracene by direct exposure thermally activated acid HZSM-5 zeolite. Calcination zeolite under oxygen is a prerequisite for through formation Lewis sites. The framework structure ZSM-5 zeolites contains two types intersecting channels sufficiently wide allow rod-shaped molecules like anthracene pass into void space. As expected,...
Chemical data on the composition of individual fluid inclusions are required to model paleofluid-rock interactions, as these direct remains former circulation in earth's crust. The proposed technique laser ablation coupled with optical emission spectrometry (LA-OES) determines ion ratios inclusions. radiations elements present plasma analysed a spectrometer equipped pulsed and gated multichannel detector. lateral resolution is around 6 µm depth quartz crater obtained for one shot 1 µm. For...
The mere exposure of trans-stilbene (t-St) to three types dehydrated medium pore acid zeolites that differ by their diameter induces t-St spontaneous ionization in high yield. In situ diffuse reflectance UV–visible, EPR, and Raman spectra recorded over several months highlight the exceptional stability charge separated states formed ferrierite (H-FER), H-MFI, mordenite (H-MOR). increase from H-FER H-MOR different behaviors after radical cation formation. t-St•+ is stabilized for narrow pores...
The first solid-state synthesis of zeolite-templated carbons (ZTCs) is reported using anthracene as the carbon precursor in FAU-structured zeolite. evolution molecule upon sublimation inside zeolite micropore system and its further condensation into larger polyaromatic species could be followed by DRUV Raman spectroscopy. development radical cation through spontaneous charge separation was found to play a fundamental role formation skeleton. A cyclic recombination behavior revealed situ EPR...