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Papers by Nady Passe-Coutrin
RSC Adv., 2015
The removal of b-HCH from contaminated water by adsorption on activated carbons is presented. Sug... more The removal of b-HCH from contaminated water by adsorption on activated carbons is presented. Sugar cane bagasse activated carbons with different textural and surface chemical properties were prepared and characterized for studying the b-HCH adsorption process. The isotherms are correlated by six models, among which the Fowler-Guggenheim/Jovanovic-Freundlich model is found to provide the best fit for two of the studied activated carbons. The isotherm adsorption data were correlated with the surface functional group composition. b-HCH adsorption was favored by the presence of acidic groups at the AC surface of chemically activated carbons. A thorough theoretical exploration of the potential energy surface for the interaction of b-HCH with a graphene sheet alone or containing hydroxyl or carboxyl surface groups was carried out. Molecular modelling results showed that under neutral to slightly acidic conditions only carboxylic surface groups should significantly contribute to b-HCH adsorption, in qualitative agreement with the experimental results. The analysis of the most stable structures suggests that the hydrogen bonds between the axial hydrogens of b-HCH and the charged oxygens of the deprotonated acidic surface groups are the main interactions responsible for the adsorption. This result is confirmed by a Temperature-Programmed Desorption study, showing that b-HCH molecules are associated with carboxylic groups of the AC surface.
Environmental science and pollution research international, Jan 28, 2015
In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical gro... more In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical groups at activated carbon (AC) surface, the solid samples were hydrogenated aiming to decrease the amounts of oxygenated groups. Two AC samples designated by BagH2O and BagP1.5 were prepared by water vapor activation and phosphoric acid activation, respectively, of sugarcane bagasse used as an AC precursor. A more simple molecule 1,2,3-trichloropropane (TCP) is used as a model of chlorinated compound. The AC were characterized by infrared, X-ray photoelectron spectroscopy (XPS), Raman resonance spectroscopies, as well as temperature-programmed desorption coupled with mass spectrometry (TPD-MS). BagP1.5 and BagH2O AC surface contained oxygenated groups. Upon hydrogenation, a decrease of most of these group amxounts was observed for both samples, while hydroxyl groups increased. On the basis of temperature-programmed desorption data obtained for AC samples contaminated with TCP or HCH, it wa...
Environmental Science and Pollution Research, 2015
In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical gro... more In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical groups at activated carbon (AC) surface, the solid samples were hydrogenated aiming to decrease the amounts of oxygenated groups. Two AC samples designated by BagH2O and BagP1.5 were prepared by water vapor activation and phosphoric acid activation, respectively, of sugarcane bagasse used as an AC precursor. A more simple molecule 1,2,3-trichloropropane (TCP) is used as a model of chlorinated compound. The AC were characterized by infrared, X-ray photoelectron spectroscopy (XPS), Raman resonance spectroscopies, as well as temperature-programmed desorption coupled with mass spectrometry (TPD-MS). BagP1.5 and BagH2O AC surface contained oxygenated groups. Upon hydrogenation, a decrease of most of these group amxounts was observed for both samples, while hydroxyl groups increased. On the basis of temperature-programmed desorption data obtained for AC samples contaminated with TCP or HCH, it was possible to determine the type of hydrogen bond formed between each AC and HCH.
Water Research, 2006
The fractal dimension of some commercial activated carbon (AC) was determined in the micro-, meso... more The fractal dimension of some commercial activated carbon (AC) was determined in the micro-, meso-and macropore range using mercury porosimetry and N 2 adsorption data.
Thermochimica Acta, 1995
ABSTRACT Several authors have reported lower temperatures for the aragonite—calcite phase transit... more ABSTRACT Several authors have reported lower temperatures for the aragonite—calcite phase transition for the skeleton of scleractinian corals, when compared with those observed in the mineral aragonite. This phenomenon has been attributed to the hydration of the coral aragonite.Using differential scanning calorimetry coupled with thermogravimetry measurements, we have observed the existence of double endothermic peaks probably connected with two separate phenomena: water desorption, followed by the aragonite—calcite transition. Determination of the enthalpy of the first endothermic peak allowed us to predict the existence of hydrogen-bonding interactions between the oxygen atoms of the carbonate planes and the water molecules.
Microporous and Mesoporous Materials, 2008
The empirical linear relationship between the BET surface area S BET and the Freundlich constant ... more The empirical linear relationship between the BET surface area S BET and the Freundlich constant K F , calculated from nitrogen adsorption isotherms of activated carbons, S BET = a 0 K F is mathematically demonstrated. This correlation exists in the relative pressure domain in which the BET equation is valid, whatever the value of c for the BET equation and for values of the Freundlich exponent, a, between 0 and 0.2. This study allows to determine the correlation factor a 0 = 1/a with a ¼ 1
Journal of Colloid and Interface Science, 2009
A new equation is derived from a combination of the BET (Brunauer, Emmett, Teller) and Freundlich... more A new equation is derived from a combination of the BET (Brunauer, Emmett, Teller) and Freundlich isotherms fitted for liquid phase adsorption data on activated carbons. This equation, depending on the Freundlich parameters and the equilibrium adsorption-desorption constant can be used for assessment of the surface area occupied by the solute molecules on a surface in a liquid phase system under some conditions.
Fuel, 2005
... Keywords: Char yield; Microporous char; Mercury porosimetry. Article Outline. ... The correla... more ... Keywords: Char yield; Microporous char; Mercury porosimetry. Article Outline. ... The correlation between a c and ε is not particularly simple. Mercury porosimetry allows to determine another parameter, the fractal dimension of the material surface area, independent on the scale. ...
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2007
A new empirical formula, based on the porosity, the botanical composition and the ash content of ... more A new empirical formula, based on the porosity, the botanical composition and the ash content of the precursor, is proposed for the assessment of the char yield, Y (wt%), of lignocellulosic materials pyrolyzed in a 600°C–900°C temperature range. The following equation is proposed: Y (wt%) = (0.8815 − 2.281/ϵ + 61.44/ϵ) · {[L(0.59 − 2.74 × 10 (t°C − 600)
Composites Part A: Applied Science and Manufacturing, 2010
This paper examines the thermal properties of cement composites reinforced with vegetable bagasse... more This paper examines the thermal properties of cement composites reinforced with vegetable bagasse fibres (1.5% and 3% wrtc).Thermal properties have been correlated to macroscopic density and porosity in order to estimate thermal conductivity of fibres using a calculation inspired from the Maxwell–Eucken modelling.Experimental investigations reveal that adding retified bagasse fibres reduces composites thermal conductivity and yields a weaker specific heat
RSC Green Chemistry, 2013
RSC Adv., 2015
The removal of b-HCH from contaminated water by adsorption on activated carbons is presented. Sug... more The removal of b-HCH from contaminated water by adsorption on activated carbons is presented. Sugar cane bagasse activated carbons with different textural and surface chemical properties were prepared and characterized for studying the b-HCH adsorption process. The isotherms are correlated by six models, among which the Fowler-Guggenheim/Jovanovic-Freundlich model is found to provide the best fit for two of the studied activated carbons. The isotherm adsorption data were correlated with the surface functional group composition. b-HCH adsorption was favored by the presence of acidic groups at the AC surface of chemically activated carbons. A thorough theoretical exploration of the potential energy surface for the interaction of b-HCH with a graphene sheet alone or containing hydroxyl or carboxyl surface groups was carried out. Molecular modelling results showed that under neutral to slightly acidic conditions only carboxylic surface groups should significantly contribute to b-HCH adsorption, in qualitative agreement with the experimental results. The analysis of the most stable structures suggests that the hydrogen bonds between the axial hydrogens of b-HCH and the charged oxygens of the deprotonated acidic surface groups are the main interactions responsible for the adsorption. This result is confirmed by a Temperature-Programmed Desorption study, showing that b-HCH molecules are associated with carboxylic groups of the AC surface.
Environmental science and pollution research international, Jan 28, 2015
In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical gro... more In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical groups at activated carbon (AC) surface, the solid samples were hydrogenated aiming to decrease the amounts of oxygenated groups. Two AC samples designated by BagH2O and BagP1.5 were prepared by water vapor activation and phosphoric acid activation, respectively, of sugarcane bagasse used as an AC precursor. A more simple molecule 1,2,3-trichloropropane (TCP) is used as a model of chlorinated compound. The AC were characterized by infrared, X-ray photoelectron spectroscopy (XPS), Raman resonance spectroscopies, as well as temperature-programmed desorption coupled with mass spectrometry (TPD-MS). BagP1.5 and BagH2O AC surface contained oxygenated groups. Upon hydrogenation, a decrease of most of these group amxounts was observed for both samples, while hydroxyl groups increased. On the basis of temperature-programmed desorption data obtained for AC samples contaminated with TCP or HCH, it wa...
Environmental Science and Pollution Research, 2015
In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical gro... more In order to understand the interactions between beta-hexachlorocyclohexane (HCH) and chemical groups at activated carbon (AC) surface, the solid samples were hydrogenated aiming to decrease the amounts of oxygenated groups. Two AC samples designated by BagH2O and BagP1.5 were prepared by water vapor activation and phosphoric acid activation, respectively, of sugarcane bagasse used as an AC precursor. A more simple molecule 1,2,3-trichloropropane (TCP) is used as a model of chlorinated compound. The AC were characterized by infrared, X-ray photoelectron spectroscopy (XPS), Raman resonance spectroscopies, as well as temperature-programmed desorption coupled with mass spectrometry (TPD-MS). BagP1.5 and BagH2O AC surface contained oxygenated groups. Upon hydrogenation, a decrease of most of these group amxounts was observed for both samples, while hydroxyl groups increased. On the basis of temperature-programmed desorption data obtained for AC samples contaminated with TCP or HCH, it was possible to determine the type of hydrogen bond formed between each AC and HCH.
Water Research, 2006
The fractal dimension of some commercial activated carbon (AC) was determined in the micro-, meso... more The fractal dimension of some commercial activated carbon (AC) was determined in the micro-, meso-and macropore range using mercury porosimetry and N 2 adsorption data.
Thermochimica Acta, 1995
ABSTRACT Several authors have reported lower temperatures for the aragonite—calcite phase transit... more ABSTRACT Several authors have reported lower temperatures for the aragonite—calcite phase transition for the skeleton of scleractinian corals, when compared with those observed in the mineral aragonite. This phenomenon has been attributed to the hydration of the coral aragonite.Using differential scanning calorimetry coupled with thermogravimetry measurements, we have observed the existence of double endothermic peaks probably connected with two separate phenomena: water desorption, followed by the aragonite—calcite transition. Determination of the enthalpy of the first endothermic peak allowed us to predict the existence of hydrogen-bonding interactions between the oxygen atoms of the carbonate planes and the water molecules.
Microporous and Mesoporous Materials, 2008
The empirical linear relationship between the BET surface area S BET and the Freundlich constant ... more The empirical linear relationship between the BET surface area S BET and the Freundlich constant K F , calculated from nitrogen adsorption isotherms of activated carbons, S BET = a 0 K F is mathematically demonstrated. This correlation exists in the relative pressure domain in which the BET equation is valid, whatever the value of c for the BET equation and for values of the Freundlich exponent, a, between 0 and 0.2. This study allows to determine the correlation factor a 0 = 1/a with a ¼ 1
Journal of Colloid and Interface Science, 2009
A new equation is derived from a combination of the BET (Brunauer, Emmett, Teller) and Freundlich... more A new equation is derived from a combination of the BET (Brunauer, Emmett, Teller) and Freundlich isotherms fitted for liquid phase adsorption data on activated carbons. This equation, depending on the Freundlich parameters and the equilibrium adsorption-desorption constant can be used for assessment of the surface area occupied by the solute molecules on a surface in a liquid phase system under some conditions.
Fuel, 2005
... Keywords: Char yield; Microporous char; Mercury porosimetry. Article Outline. ... The correla... more ... Keywords: Char yield; Microporous char; Mercury porosimetry. Article Outline. ... The correlation between a c and ε is not particularly simple. Mercury porosimetry allows to determine another parameter, the fractal dimension of the material surface area, independent on the scale. ...
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2007
A new empirical formula, based on the porosity, the botanical composition and the ash content of ... more A new empirical formula, based on the porosity, the botanical composition and the ash content of the precursor, is proposed for the assessment of the char yield, Y (wt%), of lignocellulosic materials pyrolyzed in a 600°C–900°C temperature range. The following equation is proposed: Y (wt%) = (0.8815 − 2.281/ϵ + 61.44/ϵ) · {[L(0.59 − 2.74 × 10 (t°C − 600)
Composites Part A: Applied Science and Manufacturing, 2010
This paper examines the thermal properties of cement composites reinforced with vegetable bagasse... more This paper examines the thermal properties of cement composites reinforced with vegetable bagasse fibres (1.5% and 3% wrtc).Thermal properties have been correlated to macroscopic density and porosity in order to estimate thermal conductivity of fibres using a calculation inspired from the Maxwell–Eucken modelling.Experimental investigations reveal that adding retified bagasse fibres reduces composites thermal conductivity and yields a weaker specific heat
RSC Green Chemistry, 2013