8 results on '"University of Chemical Technology and Metallurgy of Sophia (BULGARIA)"'
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2. Heterogeneous fenton and photo-fenton oxidation for paracetamol removal using iron containing ZSM-5 zeolite as catalyst
- Author
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Filipa Aleksandrova Velichkova, Bogdana Koumanova, Henri Delmas, Carine Julcour, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), University of Chemical Technology and Metallurgy of Sophia (BULGARIA), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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Environmental Engineering ,Environmental remediation ,General Chemical Engineering ,Inorganic chemistry ,Fenton-like ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Catalysis ,Catalytic processes ,Immobilization ,[CHIM.GENI]Chemical Sciences/Chemical engineering ,Génie chimique ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Zeolite ,Génie des procédés ,0105 earth and related environmental sciences ,Pollutant ,Total organic carbon ,Chemistry ,Water ,Permeation ,021001 nanoscience & nanotechnology ,6. Clean water ,Membrane ,Advanced oxidation ,Leaching (metallurgy) ,0210 nano-technology ,Biotechnology - Abstract
Paracetamol is commonly found in wastewaters, as a consequence of its high consumption and incomplete elimination by conventional treatments. Homogenous (photo-)Fenton oxidation has proved efficient for its remediation, but it suffers from uneasy dissolved iron recovery. Therefore this work examines the performance and stability of an iron containing zeolite (Fe/MFI) as catalyst for this reaction. Effects of reaction parameters (pH, temperature, catalyst and H2O2 concentrations, UV/vis irradiation) are investigated in batch conditions, by comparing the pollutant and Total Organic Carbon disappearance rates in solution, as well as the overall mineralization yield (including solid phase) and oxidant consumption. At near neutral pH paracetamol can be fully converted after 5 h, while TOC removal reaches up to 60%. Finally, thanks to good catalyst stability (low leaching), a continuous process coupling oxidation and membrane filtration is proposed, showing constant TOC conversion over 40 h and iron loss in the permeate
- Published
- 2017
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3. Mass transfer into a spherical bubble
- Author
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Maria Karsheva, Abdellah Saboni, Christophe Gourdon, Silvia Alexandrova, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Laboratoire des Sciences de l'Ingénieur Appliquées à la Mécanique et au génie Electrique (SIAME), Université de Pau et des Pays de l'Adour (UPPA), LABORATOIRE DE THERMIQUE ENERGETIQUE ET PROCEDES (EA1932) (LATEP), University of Chemical Technology and Metallurgy of Sophia (BULGARIA), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées
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General Chemical Engineering ,Bubble ,Magnetic Reynolds number ,02 engineering and technology ,Péclet number ,Numerical simulation ,01 natural sciences ,Sherwood number ,Industrial and Manufacturing Engineering ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,symbols.namesake ,[CHIM.GENI]Chemical Sciences/Chemical engineering ,Mass transfer ,0103 physical sciences ,Génie chimique ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Génie des procédés ,Physics ,Internal mass transfer ,Applied Mathematics ,Schmidt number ,Reynolds number ,General Chemistry ,Mechanics ,021001 nanoscience & nanotechnology ,Reynolds equation ,Computational physics ,symbols ,0210 nano-technology - Abstract
International audience; A numerical study has been conducted to investigate the mass transfer inside a spherical bubble at low to moderate Reynolds numbers. The Navier–Stokes and diffusion–convection equations were solved numerically by a finite difference method. The effect of the bubble Schmidt number (over the range 0.1
- Published
- 2016
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4. Effects of interface contamination on mass transfer into a spherical bubble
- Author
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Saboni, A., Alexandrova, Silvia, Karsheva, M., LABORATOIRE DE THERMIQUE ENERGETIQUE ET PROCEDES (EA1932) (LATEP), Université de Pau et des Pays de l'Adour (UPPA), and University of Chemical Technology and Metallurgy of Sophia (BULGARIA)
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surgical procedures, operative ,education ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,musculoskeletal system ,human activities ,health care economics and organizations - Abstract
ACL; International audience
- Published
- 2015
5. Heat Transfer from a Moving Fluid Sphere with Internal Heat Generation
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Christophe Gourdon, Maria Karsheva, Abdellah Saboni, Silvia Alexandrova, LABORATOIRE DE THERMIQUE ENERGETIQUE ET PROCEDES (EA1932) (LATEP), Université de Pau et des Pays de l'Adour (UPPA), University of Chemical Technology and Metallurgy of Sophia (BULGARIA), Laboratoire des Sciences de l'Ingénieur Appliquées à la Mécanique et au génie Electrique (SIAME), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées
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Physics ,fluid sphere ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Thermodynamics ,Film temperature ,Reynolds number ,02 engineering and technology ,Heat transfer coefficient ,Mechanics ,Péclet number ,Stokes flow ,021001 nanoscience & nanotechnology ,Nusselt number ,Physics::Fluid Dynamics ,symbols.namesake ,Heat generation ,viscosity ratio ,Heat transfer ,heat transfer ,0202 electrical engineering, electronic engineering, information engineering ,symbols ,heat generation ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,0210 nano-technology - Abstract
ACL; International audience; In this work, we solve numerically the unsteady conduction-convection equation including heat generation inside a fluid sphere. The results of a numerical study in which the Nusselt numbers from a spherical fluid volume were computed for different ranges of Reynolds number (0 < Re < 100), Peclet number (0 < Pe < 10000) and viscosity ratio (0 < \kappa < 10), are presented. For a circulating drop with Re → 0, steady creeping flow is assumed around and inside the sphere. In this case, the average temperatures computed from our numerical analysis are compared with those from literature and a very good agreement is found. For higher Reynolds number (0 < Re < 100), the Navier-Stokes equations are solved inside and outside the fluid sphere as well as the unsteady conduction-convection equation including heat generation inside the fluid sphere. It is proved that the viscosity ratio \kappa (\kappa = = μd/μc) influences significantly the heat transfer from the sphere. The average Nusselt number decreases with increasing \kappa for a fixed Peclet number and a given Reynolds number. It is also observed that the average Nusselt number is increasing as Peclet number increases for a fixed Re and a fixed \kappa.
- Published
- 2014
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6. Effect of the Viscosity Ratio on the Mass Transfer into a Spherical Drop in Liquid-Liquid Dispersions
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Alexandrova, S., Karsheva, M., Saboni, A., Christophe Gourdon, LABORATOIRE DE THERMIQUE ENERGETIQUE ET PROCEDES (EA1932) (LATEP), Université de Pau et des Pays de l'Adour (UPPA), University of Chemical Technology and Metallurgy of Sophia (BULGARIA), Laboratoire des Sciences de l'Ingénieur Appliquées à la Mécanique et au génie Electrique (SIAME), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées
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Physics::Fluid Dynamics ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering - Abstract
ACL; International audience; Numerical solutions of the Navier-Stokes equations of motion and the equations of mass transfer have been obtained for the unsteady state transfer into a spherical drop moving in an unbounded fluid medium of different viscosity. The effect of the viscosity ratio, k, between the dispersed phase and the continuous phase, on the mass transfer into a spherical drop, is investigated for different ranges of viscosity (0 < k < 10), Reynolds number (0 < Re < 100) and Peclet number (0 < Pe < 104).
- Published
- 2014
7. An electrochemical and surface analytical study of the formation of nanoporous oxides on niobium
- Author
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A. Girginov, Bogdan Tzvetkov, Martin Bojinov, Nadine Pébère, University of Chemical Technology and Metallurgy [Sophia], Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), University of Chemical Technology and Metallurgy of Sophia (BULGARIA), and Institut National Polytechnique de Toulouse - INPT (FRANCE)
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Materials science ,Anodic oxidation ,Matériaux ,020209 energy ,General Chemical Engineering ,2D and 3D distributions ,Oxide ,Analytical chemistry ,02 engineering and technology ,Conductivity ,chemistry.chemical_compound ,0202 electrical engineering, electronic engineering, information engineering ,Electrochemistry ,Local electrochemical ,Nanoscopic scale ,Porous oxide ,impedance spectroscopy ,Anodizing ,Nanoporous ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Chronoamperometry ,021001 nanoscience & nanotechnology ,Dielectric spectroscopy ,chemistry ,Electrode ,0210 nano-technology - Abstract
International audience; In the present paper, the anodization of Nb in mixed sulphate + fluoride electrolytes resulting in the formation of a nanoporous oxide film has been studied. Chronoamperometry and electrochemical impedance spectroscopy have been employed to characterise in situ the kinetics of the oxidation process. In addition, the evolution of the layer structure and morphology has been followed by ex situ scanning electron microscopy. Particularly, local electrochemical impedance spectroscopy has been used to discern between the mesoscopic 2D and 3D distributions of time constants at the electrode surface. The similarity between local and global impedance spectra during anodic oxidation of Nb demonstrates the presence of an inherent 3D distribution of the high-frequency time constant, which is interpreted as in-depth variation of the steady state conductivity of the passive film. The experimental and calculational results are discussed in relation to the micro- and nanoscopic structure of the formed oxide.
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- 2007
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8. Microwave dielectric properties of the spinel composition Mg1+xTixAl2-2xO4
- Author
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Badev, Alex, Iliev, I., Cambronne, Jean-Pascal, Lebey, Thierry, Barnabé, Antoine, Levcheva, Valda, Pagès, Nathalie, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Sofia University St. Kliment Ohridski (BULGARIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), and University of Chemical Technology and Metallurgy of Sophia (BULGARIA)
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[SPI] Engineering Sciences [physics] ,Matériaux ,Structure ,Substituted aluminates ,Microwave properties - Abstract
The objects of our research is magnesium aluminates (spinel), in which the electric charge of Al3+ cation is partially substituted with constitutive trivalent cation of Mg2+ and Ti 4+ in the system with the following composition: Mg1+xTixAl2-2xO4 with (x) varying from 0,1 to 0,6. X-ray diffraction data shows that within the above values of (x) the composition is a single phase spinel. The microwave basic parameters were measured as εr, tan δ and τf, respectively with the following values: εr = 6-12, tanδ = (1.5-3.5) x 10-4 at 10 GHz and Qf = 70 000 – 90 000, and τf from -50 to -70 ppm/deg.
- Published
- 2007
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