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Selmani A, Siboulet B, Špadina M, Foucaud Y, Dražić G, Radatović B, Korade K, Nemet I, Kovačević D, Dufrêche JF, Bohinc K. Cation Adsorption in TiO 2 Nanotubes: Implication for Water Decontamination. ACS Appl Nano Mater 2023; 6:12711-12725. [PMID: 37533543 PMCID: PMC10391741 DOI: 10.1021/acsanm.3c00916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 06/13/2023] [Indexed: 08/04/2023]
Abstract
TiO2 nanotubes constitute very promising nanomaterials for water decontamination by the removal of cations. We combined a range of experimental techniques from structural analyses to measurements of the properties of aqueous suspensions of nanotubes, with (i) continuous solvent modeling and (ii) quantum DFT-based simulations to assess the adsorption of Cs+ on TiO2 nanotubes and to predict the separation of metal ions. The methodology is set to be operable under realistic conditions, which, in this case, include the presence of CO2 that needs to be treated as a substantial contaminant, both in experiments and in models. The mesoscopic model, based on the Poisson-Boltzmann equation and surface adsorption equilibrium, predicts that H+ ions are the charge-determining species, while Cs+ ions are in the diffuse layer of the outer surface with a significant contribution only at high concentrations and high pH. The effect of the size of nanotubes in terms of the polydispersity and the distribution of the inner and outer radii is shown to be a third-order effect that is very small when the nanotube layer is not very thick (ranging from 1 to 2 nm). Besides, DFT-based molecular dynamics simulations demonstrate that, for protonation, the one-site and successive association assumption is correct, while, for Cs+ adsorption, the size of the cation is important and the adsorption sites should be carefully defined.
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Affiliation(s)
- Atiđa Selmani
- Division
of Physical Chemistry, Ruđer Bošković
Institute, Bijenička
Cesta 54, 10000 Zagreb, Croatia
- Pharmaceutical
Technology & Biopharmacy, Institute
of Pharmaceutical Sciences, University of Graz, A-8010, Graz, Austria
| | - Bertrand Siboulet
- ICSM,
Université Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Ceze, France
| | - Mario Špadina
- Division
of Physical Chemistry, Ruđer Bošković
Institute, Bijenička
Cesta 54, 10000 Zagreb, Croatia
- Faculty
of Health Sciences, University of Ljubljana, Zdravstvena 5, SI-1000 Ljubljana, Slovenia
| | - Yann Foucaud
- ICSM,
Université Montpellier, CEA, CNRS, ENSCM, 30207 Bagnols-sur-Ceze, France
| | - Goran Dražić
- Laboratory
for Materials Chemistry, National Institute
of Chemistry, Hajdrihova ulica 19, SI-1000 Ljubljana, Slovenia
| | | | - Karla Korade
- Faculty of
Science, University of Zagreb, Horvatovac 102A, 10 000 Zagreb, Croatia
| | - Ivan Nemet
- Faculty of
Science, University of Zagreb, Horvatovac 102A, 10 000 Zagreb, Croatia
| | - Davor Kovačević
- Faculty of
Science, University of Zagreb, Horvatovac 102A, 10 000 Zagreb, Croatia
| | | | - Klemen Bohinc
- Faculty
of Health Sciences, University of Ljubljana, Zdravstvena 5, SI-1000 Ljubljana, Slovenia
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2
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Filippov LO, Silva LA, Pereira AM, Bastos LC, Correia JC, Silva K, Piçarra A, Foucaud Y. Molecular models of hematite, goethite, kaolinite, and quartz: Surface terminations, ionic interactions, nano topography, and water coordination. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Foucaud Y, Dufrêche JF, Siboulet B, Duvail M, Jonchère A, Diat O, Vuilleumier R. Why local and non-local terms are essential for second harmonic generation simulation? Phys Chem Chem Phys 2022; 24:12961-12973. [PMID: 35580631 DOI: 10.1039/d1cp05437f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Second Harmonic Generation (SHG) today represents one of the most powerful techniques to selectively probe all types of interfaces. However, the origin of the SHG signal at a molecular level is still debated since the local dipole contribution, which is strongly correlated to the molecular orientation can be counterbalanced by non-local quadrupole contributions. Here, we propose a method to simulate the SHG signal of a model water/air interface from the molecular response of each contribution. This method includes both local and non-local terms, which are represented, respectively, by the dependency of the polarisability and hyperpolarisability upon the chemical environment of the molecule and by the bulk quadrupole response. The importance of both terms for the sound simulation of the SHG signals and their interpretation is assessed. We demonstrate that the sole dipole term is unable to simulate a SHG signal, even if the dependency of the hyperpolarisability on the local environment is considered. The inclusion of the bulk quadrupole contribution, which largely dominates the dipole contribution, is essential to predict the SHG response, although the accuracy of the prediction is increased when the dependency upon the local environment is considered.
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Affiliation(s)
- Yann Foucaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | | | | | - Magali Duvail
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Alban Jonchère
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Rodolphe Vuilleumier
- PASTEUR, Département de Chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
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4
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Ilager D, Shetti NP, Foucaud Y, Badawi M, Aminabhavi TM. Graphene/g-carbon nitride (GO/g-C 3N 4) nanohybrids as a sensor material for the detection of methyl parathion and carbendazim. Chemosphere 2022; 292:133450. [PMID: 34979209 DOI: 10.1016/j.chemosphere.2021.133450] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 11/25/2021] [Accepted: 12/24/2021] [Indexed: 06/14/2023]
Abstract
The widespread use of methyl parathion (MP) and carbendazim (CBZ) as pesticide molecules for controlling pests and protect crops has added pollution issues; excess usage of these can lead to atmospheric pollution through contaminating water and soil sources. In the present study, detection of these compounds at the trace level was achieved by employing graphene oxide (GO) and graphitic carbon nitride (g-C3N4) nanohybrid electrode assembly (GO/g-C3N4/GCE). The X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), and Atomic Force Microscopy (AFM) techniques were also used to characterize the materials developed to reveal their purity, crystal structure, and morphology. The complete voltammetric behavior of these analytes was investigated using cyclic voltammetic (CV) and square wave voltammetry (SWV) techniques. The influence of pH was studied and it was noticed that electrochemical response was the highest at pH 7.0 for MP and at pH 4.2 for CBZ. Density Functional Theory (DFT) calculations could help us to understand the adsorption behavior of MP and CBZ onto the GO and g-C3N4 before their degradation due to the electrochemical reactions. SWV technique was helpful in the trace level detection of MP and CBZ. Linearity plots were obtained in the range of concentration from 8.0 × 10-8 M to 1.0 × 10-4 M with a limit of detection 0.824 nM for MP and 1.0 × 10-8 M to 2.5 × 10-4 M for CBZ with the detection limit of 2.82 nM. Significance of the developed method in the field of agricultural and environmental domains was successfully investigated by monitoring MP and CBZ in water and soil samples, and the obtained results suggested the selectivity, stability, and reproducibility of the newly developed GO/g-C3N4/GCE electrode assembly.
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Affiliation(s)
- Davalasab Ilager
- Department of Chemistry, K.L.E. Institute of Technology, Hubballi, 580 027, Karnataka, India
| | - Nagaraj P Shetti
- School of Advanced Sciences, KLE Technological University, Vidyanagar, Hubballi, 580 031, Karnataka, India.
| | | | | | - Tejraj M Aminabhavi
- School of Advanced Sciences, KLE Technological University, Vidyanagar, Hubballi, 580 031, Karnataka, India
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5
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Semmeq A, Foucaud Y, El Yamami N, Michailovski A, Lebègue S, Badawi M. Hydration of magnesite and dolomite minerals: new insights from ab initio molecular dynamics. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Foucaud Y, Siboulet B, Duvail M, Jonchere A, Diat O, Vuilleumier R, Dufrêche JF. Deciphering second harmonic generation signals. Chem Sci 2021; 12:15134-15142. [PMID: 34909155 PMCID: PMC8612378 DOI: 10.1039/d1sc03960a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 10/25/2021] [Indexed: 11/21/2022] Open
Abstract
Second harmonic generation (SHG) has emerged as one of the most powerful techniques used to selectively monitor surface dynamics and reactions for all types of interfaces as well as for imaging non-centrosymmetric structures, although the molecular origin of the SHG signal is still poorly understood. Here, we present a breakthrough approach to predict and interpret the SHG signal at the atomic level, which is freed from the hyperpolarisability concept and self-consistently considers the non-locality and the coupling with the environment. The direct ab initio method developed here shows that a bulk quadrupole contribution significantly overwhelms the interface dipole term in the purely interfacial induced second-order polarisation for water/air interfaces. The obtained simulated SHG responses are in unprecedented agreement with the experimental signal. This work not only paves the road for the prediction of SHG response from more complex interfaces of all types, but also suggests new insights in the interpretation of the SHG signal at a molecular level. In particular, it highlights the modest influence of the molecular orientation and the high significance of the bulk quadrupole contribution, which does not depend on the interface, in the total experimental response. Second harmonic generation is one of the most powerful techniques used to selectively probe interfaces of all types. The direct ab initio method developed here allows predicting the signal and highlights the importance of local and non-local effects.![]()
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Affiliation(s)
- Yann Foucaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | | | - Magali Duvail
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Alban Jonchere
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Rodolphe Vuilleumier
- PASTEUR, Département de Chimie, Ecole Normale Supérieure, PSL University, Sorbonne Université, CNRS 75005 Paris France
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Wu H, Renno AD, Foucaud Y, Rudolph M. Study of the Influence of the Crystallographic Orientation of Cassiterite Observed with Colloidal Probe Atomic Force Microscopy and its Implications for Hydrophobization by an Anionic Flotation Collector. ACS Omega 2021; 6:4212-4226. [PMID: 33644544 PMCID: PMC7908031 DOI: 10.1021/acsomega.0c03980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/08/2021] [Indexed: 06/12/2023]
Abstract
In this study, the physicochemical behaviors of the (110), (100), as well as (001) of SnO2 were investigated by using high-resolution direct force spectroscopy. The measurements were conducted between a silica sphere and sample surfaces in 10 mmol/L KCl between pH 3.1 and 6.2 using colloidal probe atomic force microscopy (cp-AFM-hydrophilic). Dissimilar interactions were detected on different-oriented surfaces. The pH values where the force switched from positive to negative can be clearly distinguished and be ordered as SnO2(100) < SnO2(001) ≈ SnO2(110). By fitting the force curves in the Derjaguin-Landau-Verwey-Overbeck theory framework, anisotropic surface potentials were computed between the three sample surfaces following a similar trend as force interaction. To study the implication of crystallographic orientation to surfactant adsorption, we used Aerosol 22 (sulfosuccinamate) as an anionic collector for cassiterite flotation to functionalize the different samples at pH 3. The contact angle measurements, the topography visualizations by AFM, and the force measurement using cp-AFM with hydrophobized spheres (cp-AFM-hydrophobized) have shown that Aerosol 22 was adsorbed on the sample surfaces inhomogeneously. The adsorption followed the range of SnO2(110) > SnO2(100) > SnO2(001) in the concentration from 1 × 10-6 to 1 × 10-4 mol/L.
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Affiliation(s)
- Haosheng Wu
- Helmholtz-Zentrum
Dresden-Rossendorf (HZDR), Helmholtz Institute Freiberg for Resource
Technology (HIF), Chemnitzer
Str. 40, Freiberg 09599, Germany
| | - Axel D. Renno
- Helmholtz-Zentrum
Dresden-Rossendorf (HZDR), Helmholtz Institute Freiberg for Resource
Technology (HIF), Chemnitzer
Str. 40, Freiberg 09599, Germany
| | - Yann Foucaud
- ICSM,
Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, Bagnols-sur-Cèze 30207, France
| | - Martin Rudolph
- Helmholtz-Zentrum
Dresden-Rossendorf (HZDR), Helmholtz Institute Freiberg for Resource
Technology (HIF), Chemnitzer
Str. 40, Freiberg 09599, Germany
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Foucaud Y, Lainé J, Filippov LO, Barrès O, Kim WJ, Filippova IV, Pastore M, Lebègue S, Badawi M. Adsorption mechanisms of fatty acids on fluorite unraveled by infrared spectroscopy and first-principles calculations. J Colloid Interface Sci 2021; 583:692-703. [PMID: 33039866 DOI: 10.1016/j.jcis.2020.09.062] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/09/2020] [Accepted: 09/15/2020] [Indexed: 12/13/2022]
Abstract
HYPOTHESIS The adsorption mechanisms of fatty acids on minerals are largely debated from years, and their understanding is now required to improve flotation processing in the critical context of raw materials. Three wavenumbers have been observed in the literature for the asymmetric stretching vibration of COO- after the adsorption of fatty acids on mineral surfaces. They have been interpreted as different adsorbed forms, such as a precipitate formation, an adsorption of sole or bridged carboxylates, an anion exchange, or adsorbed modes, such as monodentate or bidentate configurations. EXPERIMENTS/THEORY Diffuse reflectance infrared Fourier transform spectroscopy was combined with ab initio molecular dynamics simulations and simulation of infrared spectra. Fluorite and sodium octanoate - or longer-chain fatty acids - were used as prototypical materials for all the investigations. FINDINGS At low fatty acids concentration, the asymmetric stretching vibration of COO- peaks at 1560 cm-1 while, at higher concentration, this infrared band converts into a doublet peaking at 1535 and 1575 cm-1. Using simulations, we assign the band at 1560 cm-1 to the adsorption of a carboxylate molecule bridged on a sodium counter-cation and the doublet at 1535 and 1575 cm-1 to the adsorption of the sole carboxylate anion under a monodentate or a bidentate binuclear configuration, respectively. The formation of an adsorbed layer on the mineral surface is initiated by the adsorption of a sodium carboxylate and followed by the adsorption of mixed sole anionic forms. The role of the carboxylate counter-cation is highlighted for the first time, which was totally ignored in the literature beforehand. This particularly opens the path to the development of innovative strategies to enhance the separation contrast between minerals, which is of uttermost importance for the recovery of critical raw materials.
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Affiliation(s)
- Yann Foucaud
- Université de Lorraine and CNRS, GeoRessources, F54000 Nancy, France.
| | - Juliette Lainé
- Université de Lorraine and CNRS, LPCT, F54000 Nancy, France
| | - Lev O Filippov
- Université de Lorraine and CNRS, GeoRessources, F54000 Nancy, France; National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Odile Barrès
- Université de Lorraine and CNRS, GeoRessources, F54000 Nancy, France
| | - Won June Kim
- Changwon National University, Department of Biology and Chemistry, South Korea
| | - Inna V Filippova
- Université de Lorraine and CNRS, GeoRessources, F54000 Nancy, France
| | | | | | - Michael Badawi
- Université de Lorraine and CNRS, LPCT, F54000 Nancy, France.
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Foucaud Y, Filippov L, Filippova I, Badawi M. The Challenge of Tungsten Skarn Processing by Froth Flotation: A Review. Front Chem 2020; 8:230. [PMID: 32373577 PMCID: PMC7179254 DOI: 10.3389/fchem.2020.00230] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 03/10/2020] [Indexed: 11/13/2022] Open
Abstract
Recently, tungsten has drawn worldwide attention considering its high supply risk and economic importance in the modern society. Skarns represent one of the most important types of tungsten deposits in terms of reserves. They contain fine-grained scheelite (CaWO4) associated with complex gangue minerals, i.e., minerals that display similar properties, particularly surface properties, compared to scheelite. Consistently, the froth flotation of scheelite still remains, in the twenty first century, a strong scientific, industrial, and technical challenge. Various reagents suitable for scheelite flotation (collectors and depressants, mostly) are reviewed in the present work, with a strong focus on the separation of scheelite from calcium salts, namely, fluorite, apatite, and calcite, which generally represent significant amounts in tungsten skarns. Albeit some reagents allow increasing significantly the selectivity regarding a mineral, most reagents fail in providing a good global selectivity in favor of scheelite. Overall, the greenest, most efficient, and cheapest method for scheelite flotation is to use fatty acids as collectors with sodium silicate as depressant, although this solution suffers from a crucial lack of selectivity regarding the above-mentioned calcium salts. Therefore, the use of reagent combinations, commonly displaying synergistic effects, is highly recommended to achieve a selective flotation of scheelite from the calcium salts as well as from calcium silicates.
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Affiliation(s)
- Yann Foucaud
- Université de Lorraine, CNRS, GeoRessources, Nancy, France
| | - Lev Filippov
- Université de Lorraine, CNRS, GeoRessources, Nancy, France.,National University of Science and Technology MISIS, Moscow, Russia
| | - Inna Filippova
- Université de Lorraine, CNRS, GeoRessources, Nancy, France
| | - Michael Badawi
- Université de Lorraine, CNRS, Laboratoire de Physique et Chimie Théoriques, Nancy, France
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Foucaud Y, Badawi M, Filippov LO, Barres O, Filippova IV, Lebègue S. Synergistic adsorptions of Na 2CO 3 and Na 2SiO 3 on calcium minerals revealed by spectroscopic and ab initio molecular dynamics studies. Chem Sci 2019; 10:9928-9940. [PMID: 32190236 PMCID: PMC7066678 DOI: 10.1039/c9sc03366a] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 10/05/2019] [Indexed: 11/23/2022] Open
Abstract
FTIR, XPS, and ab initio molecular dynamics studies demonstrated that sodium silicate (Na2SiO3) adsorbs on fluorite with a higher affinity when they are treated beforehand by sodium carbonate (Na2CO3) due to proton exchange(s).
The synergistic effects between sodium silicate (Na2SiO3) and sodium carbonate (Na2CO3) adsorbed on mineral surfaces are not yet understood, making it impossible to finely tune their respective amounts in various industrial processes. In order to unravel this phenomenon, diffuse reflectance infrared Fourier transform and X-ray photoelectron spectroscopies were combined with ab initio molecular dynamics to investigate the adsorption of Na2SiO3 onto bare and carbonated fluorite (CaF2), an archetypal calcium mineral. Both experimental and theoretical results proved that Na2CO3 adsorbs onto CaF2 with a high affinity and forms a layer of Na2CO3 on the surface. Besides, at low Na2SiO3 concentration, silica mainly physisorbs in a monomeric protonated form, Si(OH)4, while at larger concentration, significant amounts of polymerised and deprotonated forms are identified. Prior surface carbonation induces an acid–base reaction on the surface, which results in the formation of the basic forms of the monomers and the dimers, i.e. SiO(OH)3– and Si2O3(OH)42–, even at low coverage. Their adsorption is highly favoured compared to the acid forms, which explains the synergistic effects observed when Na2SiO3 is used after Na2CO3. The formation of the basic form on the bare surface is observed only by increasing the surface coverage to 100%. Hence, when Na2CO3 is used during a separation process, lower Na2SiO3 concentrations are needed to obtain the same effect as with lone Na2SiO3 in the separation process.
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Affiliation(s)
- Yann Foucaud
- Université de Lorraine , CNRS, GeoRessources Laboratory , F-54000 Nancy , France . ; ;
| | - Michaël Badawi
- Laboratoire de Physique et Chimie Théoriques , Université de Lorraine , UMR 7019 - CNRS , BP239 , Boulevard des Aiguillettes , 54 506 Vandoeuvre-lès-Nancy Cedex , France
| | - Lev O Filippov
- Université de Lorraine , CNRS, GeoRessources Laboratory , F-54000 Nancy , France . ; ; .,National University of Science and Technology MISIS , 119049 Moscow , Russia
| | - Odile Barres
- Université de Lorraine , CNRS, GeoRessources Laboratory , F-54000 Nancy , France . ; ;
| | - Inna V Filippova
- Université de Lorraine , CNRS, GeoRessources Laboratory , F-54000 Nancy , France . ; ; .,National University of Science and Technology MISIS , 119049 Moscow , Russia
| | - Sébastien Lebègue
- Laboratoire de Physique et Chimie Théoriques , Université de Lorraine , UMR 7019 - CNRS , BP239 , Boulevard des Aiguillettes , 54 506 Vandoeuvre-lès-Nancy Cedex , France
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Foucaud Y, Filippova I, Filippov L. Investigation of the depressants involved in the selective flotation of scheelite from apatite, fluorite, and calcium silicates: Focus on the sodium silicate/sodium carbonate system. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.04.071] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Foucaud Y, Lebègue S, Filippov LO, Filippova IV, Badawi M. Molecular Insight into Fatty Acid Adsorption on Bare and Hydrated (111) Fluorite Surface. J Phys Chem B 2018; 122:12403-12410. [PMID: 30481022 DOI: 10.1021/acs.jpcb.8b08969] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The adsorption of fatty acids with various chain structures on the (111) fluorite surface is investigated using density functional theory, including a correction for dispersive interactions. In the case of the acidic form, we observe that the molecular form is preferred over the dissociated one and the molecule adsorbs on a surface calcium atom with an energy of -78.2 kJ mol-1. Also, we show that the carboxylate anion adsorbs on the surface under two possible configurations, a bidentate binuclear one or a monodentate one, the bidentate binuclear being favored. At both 0 and 300 K, the chain length does not affect the geometry of the carboxyl group but it strongly impacts the global geometry of the molecule adsorption on the fluorite surface: the "flat" adsorption mode, i.e., when the molecule is parallel to the surface, is favored when the number of carbon atoms is equal to or higher than 6, due to dispersion forces. However, when the molecule is in hydrated condition, the chain folds up by itself to reduce the interactions with water while the carboxylate group adsorbs in monodentate configuration. In aqueous conditions, the chain length does not impact anymore the adsorption energies, the vertical adsorption mode being always favored.
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Affiliation(s)
- Yann Foucaud
- Laboratoire GeoRessources , Université de Lorraine, UMR 7359-CNRS , 2 rue du Doyen Marcel Roubault , 54 505 Vandœuvre-lès-Nancy Cedex, France
| | - Sébastien Lebègue
- Laboratoire Physique et Chimie Théoriques , Université de Lorraine, UMR 7019-CNRS , BP239, Boulevard des Aiguillettes , 54 506 Vandoeuvre-lès-Nancy Cedex, France
| | - Lev O Filippov
- Laboratoire GeoRessources , Université de Lorraine, UMR 7359-CNRS , 2 rue du Doyen Marcel Roubault , 54 505 Vandœuvre-lès-Nancy Cedex, France
| | - Inna V Filippova
- Laboratoire GeoRessources , Université de Lorraine, UMR 7359-CNRS , 2 rue du Doyen Marcel Roubault , 54 505 Vandœuvre-lès-Nancy Cedex, France
| | - Michaël Badawi
- Laboratoire Physique et Chimie Théoriques , Université de Lorraine, UMR 7019-CNRS , BP239, Boulevard des Aiguillettes , 54 506 Vandoeuvre-lès-Nancy Cedex, France
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Foucaud Y, Badawi M, Filippov LO, Filippova IV, Lebègue S. Surface Properties of Fluorite in Presence of Water: An Atomistic Investigation. J Phys Chem B 2018; 122:6829-6836. [PMID: 29709180 DOI: 10.1021/acs.jpcb.8b02717] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Density functional theory simulations, including a correction for dispersive interactions, were performed to investigate the adsorption of water on the main cleavage plane of the fluorite, namely, the (111) surface. In the case of a single molecule of water, we observe that the molecular form is preferred over the dissociated one, and absorbs on the surface with an energy of -55 kJ mol-1, including a significant contribution from the dispersion forces. Also, we show that the substitution of a fluorine atom by a hydroxyl group on the surface of fluorite is not energetically favorable. Then, the hydration of the surface in function of the coverage by water molecules was studied in a systematic way. It was shown that the geometries involving the formation of a cluster of water molecules on the surface, with half of the molecules adsorbed, are the most favorable. Finally, ab initio molecular dynamics conducted at 300 K confirms the trends observed at 0 K, albeit the adsorption energies are reduced by about 10 kJ mol-1. Also, we observe that once put in the interaction with a large number of water molecules, half of the calcium atoms at the surface are in close interaction with a water molecule, whereas the rest of the molecules are further away but present a relatively well-defined structure showing similarities with the one of water clusters.
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Affiliation(s)
- Yann Foucaud
- Laboratoire GeoRessources , Université de Lorraine, UMR 7359-CNRS , 2 rue du Doyen Marcel Roubault , 54 505 Vandœuvre-lès-Nancy Cedex, France
| | - Michaël Badawi
- Laboratoire Physique et Chimie Théoriques , Université de Lorraine, UMR 7019-CNRS , BP239, Boulevard des Aiguillettes , 54 506 Vandoeuvre-lès-Nancy Cedex, France
| | - Lev O Filippov
- Laboratoire GeoRessources , Université de Lorraine, UMR 7359-CNRS , 2 rue du Doyen Marcel Roubault , 54 505 Vandœuvre-lès-Nancy Cedex, France
| | - Inna V Filippova
- Laboratoire GeoRessources , Université de Lorraine, UMR 7359-CNRS , 2 rue du Doyen Marcel Roubault , 54 505 Vandœuvre-lès-Nancy Cedex, France
| | - Sébastien Lebègue
- Laboratoire Physique et Chimie Théoriques , Université de Lorraine, UMR 7019-CNRS , BP239, Boulevard des Aiguillettes , 54 506 Vandoeuvre-lès-Nancy Cedex, France
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