A5102960029- Clay minerals and soil interactions
- Arsenic contamination and mitigation
- CO2 Sequestration and Geologic Interactions
- Calcium Carbonate Crystallization and Inhibition
- Mine drainage and remediation techniques
- Iron oxide chemistry and applications
- Geological and Geochemical Analysis
- Kidney Stones and Urolithiasis Treatments
- Selenium in Biological Systems
- Minerals Flotation and Separation Techniques
- Soil and Unsaturated Flow
- Mineral Processing and Grinding
- Drilling and Well Engineering
- Paleontology and Stratigraphy of Fossils
- Concrete and Cement Materials Research
- Hydrocarbon exploration and reservoir analysis
- Nanoparticles: synthesis and applications
- Zeolite Catalysis and Synthesis
- Enhanced Oil Recovery Techniques
- Catalysts for Methane Reforming
- Geochemistry and Elemental Analysis
- Landfill Environmental Impact Studies
- Chemical Looping and Thermochemical Processes
- Gold and Silver Nanoparticles Synthesis and Applications
- Microplastics and Plastic Pollution
Institut des Sciences de la Terre
2013-2024
Centre National de la Recherche Scientifique
2013-2024
Université Savoie Mont Blanc
2018-2024
Institut de Recherche pour le Développement
2018-2024
Université Grenoble Alpes
2013-2024
Université Gustave Eiffel
2013-2024
Université Joseph Fourier
2010-2013
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2008
Laboratoire des Écoulements Géophysiques et Industriels
2008
Université de Lorraine
2006
Silver nanoparticles (Ag-NPs) adhered/inserted on textile fibers have an effective antimicrobial role. However, their release due to low adherence and fate in the natural settings been questioned terms of toxicity level. In order overcome this recurrent problem adherence, situ formation Ag-NPs five (cotton (untreated chemically bleached), sheep's wool, polyamide, polyester) was assessed. Herein, were first immersed a silver ion solution (1 g/L AgNO3) for saturation at room T 24 h followed by...
Since the 1970s, it has been shown that calcium phosphate crystals nucleate from one or several early amorphous phases into in vivo and vitro systems. However, precise chemical composition, structure, transformation mechanism of these remain controversial. Here, we characterize reaction kinetics formation two crystals, brushite hydroxyapatite, by using situ Raman spectroscopy batch reactors at 25 °C. We investigate three pH regimes to control speciation solution used solutions with without...
Here, we show that calcium sulfate dihydrate (gypsum) can be directly, rapidly and reversibly converted to hemihydrate (bassanite) in high salinity solutions (brines). The optimum conditions for the efficient production of bassanite a short time (<5 min) involve use brines with c(NaCl) > 4 M maintaining temperature, T 80 °C. When solution containing crystals is cooled down around room eventually gypsum formed. temperature raised again °C, re-precipitated. This contrasts better-known...
This study proposes a simple and novel synthesis route for rhombohedral single crystals (<2 μm) of magnesite. can be summarized by two main sequential reactions: (1) aqueous carbonation synthetic brucite (Mg(OH)2) injection CO2 in highly alkaline medium (2 m NaOH) at ambient temperature (∼20 °C), leading to precipitation platy-compacted aggregates dypingite (Mg5(CO3)4(OH)2·5H2O) after 24 h, (2) complete dypingite-to-magnesite transformation h heat-aging step from 20 90 °C. The implies the...
Antimony, which has damaging effects on the human body and ecosystem, can be released into soils, ground-, surface waters either from ore minerals that weather in near environments, or due to anthropogenic releases waste rich antimony, a component used batteries, electronics, ammunitions, plastics, many other industrial applications. Here, we show dissolved Sb interact with calcite, widespread carbonate mineral, through coupled dissolution–precipitation mechanism. The process is imaged situ,...
The challenge to produce dolomite CaMg(CO3)2 at low temperature (20–35 °C) over laboratory time scales so far has remained unsuccessful, which led long-lasting scientific debates in the last two centuries. This mineral exerts a major control on natural carbon dioxide sequestration into various sedimentary, basaltic, and mantellic rocks. present study reports specific abiotic conditions that allow precipitation of disordered dolomite, high Mg calcite, Ca magnesite room hours days. Here we...
The present study describes a simple and novel synthesis route for submicrometric acicular goethite (α-FeOOH) using high OH/Fe molar ratio (=5) moderate temperature (30 70 °C). Two different alkaline sources (NaOH Ca(OH)2) two iron(III) (FeCl3·6H2O Fe(NO3)3.9H2O) were investigated. FESEM, XRD, FTIR, N2 sorption isotherms, color evolution, pH monitoring have been used to determine the formation mechanism, particle size, specific surface area, morphology of particles. Three regions determined...
Calcite, a widespread natural mineral at the Earth's surface, is well-known for its capacity to sequester various elements within structure. Among these elements, selenium important because of high toxicity in systems and human health. In form selenite (Se((IV))), can be incorporated into calcite during growth. Our situ atomic force microscopy observations surfaces contact with selenium-bearing solutions demonstrate that another process trapping occur under conditions which dissolves. Upon...
Recent increases in industrial activity have resulted elevated chromium (Cr) pollution the natural environment, from degradation of concrete and leakage water landfills or mine waste. The release toxic chromate ions into environment could harmful consequences. Methods for Cr removal are therefore becoming increasingly important to control this highly metal environment. This study examines how (CrO42−) can be incorporated a new, stable solid phase at dissolving calcite surface. To...
In order to better understand the microtextural changes associated with serpentinization reactions, natural millimeter-sized olivine grains were experimentally reacted alkaline NaOH and NaHCO3 solutions at a temperature of 200 °C for durations 3 12 months. During hydration experiments, dissolution precipitation intimately correlated in time space, reaction products growing situ, either as layered veins or nearly continuous surface cover. contrast, carbonation experiments showed strong...
In the present study, we demonstrate that ordered dolomite can be precipitated via simultaneous dissolution of calcite and magnesite under hydrothermal conditions (from 100 to 200 °C). The temperature high-carbonate alkalinity have significantly copromoted formation. For example, when high-purity water was initially used as interacting fluid, only a small proportion disordered identified at °C from XRD patterns FESEM observations. Conversely, higher dolomite, i.e., clear identification...
Magnetite is a widespread inorganic mineral or biomineral with very specific and extraordinary chemical properties in terms of acid–base oxidation–reduction behavior, thermal stability, oxygen mobility. Despite the existence many synthesis methods, formation mechanisms this are actively investigated frequently debated. The coprecipitation reaction (2Fe3+ + Fe2+ 8OH– ⃗ Fe3O4 4H2O) most method to synthesize magnetite under laboratory conditions at an industrial scale. However, early stages...
Abstract Herein, we report new insights into the nucleation and growth processes of chrysotile nanotubes by using batch semi‐continuous experiments. For synthesis this highly carcinogenic material, influences temperature (90, 200, 300 °C), Si/Mg molar ratio, reaction time were investigated. From experiments (i.e., sampling reacting suspension over time) solid‐state characterization collected samples XRPD, TGA, FTIR spectroscopy, FESEM, three main steps identified for at °C: 1) formation...
Simple method to synthesize porous calcite mesocrystals by aqueous carbonation of portlandite in presence common domestic drinks.