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Papers by Abdelkader Bengueddach

MATEC Web of Conferences, 2013

Iron-containing SBA15 catalysts have been prepared following different synthesisroutes, direct sy... more Iron-containing SBA15 catalysts have been prepared following different synthesisroutes, direct synthesis by adjusting pH at 3 and 6 and with post synthesis procedure. Activity and stability of these materials were assessed on the photo-Fenton degradation of phenolic aqueous solutions by H 2 O 2 using near UV irradiation (254 nm) at room temperature and initial neutral pH. Their catalytic performance was mentioned in terms of phenol and total organic carbon (TOC) conversions. Several complementary techniques, including XRD, Nitrogen sorption isotherms, UV visible, were used to evaluate the final structural and textural properties of calcined Fe-SBA15 materials. These materials show a high activity and stability of iron species.

Arabian Journal of Chemistry, 2011

The condensation of sugar with fatty acids in an organic media is possible by chemical amidificat... more The condensation of sugar with fatty acids in an organic media is possible by chemical amidification without fastidious steps by hydroxyl group protection/deprotection. The acylation of sugar (N-methyl glucamine) with fatty acids (lauric acid, palmitic acid and stearic acid) is catalyzed in the presence of two inorganic and acid solid catalysts: Algerian clay called bentonite of Maghnia and mesoporous material of type (Al-MCM-41). The results obtained with this last solid (i.e. MCM-41) are very encouraging.

Mesoporous materials are very commonly used as adsorbent materials for removing phenolic compound... more Mesoporous materials are very commonly used as adsorbent materials for removing phenolic compounds. However, the adsorption mechanism of these compounds is still poorly controlled. However, understanding the interactions mesoporous materials/adsorbed molecules is very important in order to optimize the processes of liquid phase adsorption. The difficulty of synthesis is to keep an orderly and cubic pore structure and achieve a homogeneous surface modification. The grafting of Si(CH₃)₃ was chosen, to transform hydrophilic surfaces hydrophobic surfaces. The aim of this work is to study the kinetics and thermodynamics of two volatile organic compounds VOC phenol (PhOH) and P hydroxy benzoic acid (4AHB) on a mesoporous material of type MCM-48 grafted with an organosilane of the Trimethylchlorosilane (TMCS) type, the material thus grafted or functionalized (hereinafter referred to as MCM-48-G). In a first step, the kinetic and thermodynamic s...

Applied Catalysis A: General, 1999

ABSTRACT Adsorption of C3H6 has been carried out thermogravimetrically on M2+X zeolites (M2+=Zn2+... more ABSTRACT Adsorption of C3H6 has been carried out thermogravimetrically on M2+X zeolites (M2+=Zn2+ or Cu2+) exchanged at different degrees. The Gibbs energy change, the isosteric heat and the differential entropy change of C3H6 adsorbed at intervals of 20 K between 303 and 363 K are investigated. Analysis of the Gibbs energy change curves reveals particularly the character energetically heterogeneous of NaX and Zn(x)X samples with respect to the C3H6 adsorption. Evaluation of the isosteric heat shows that these adsorbents present strong adsorptive centre–adsorbate interactions, in contrast to Cu(x)X where it is noted the predominance of attractive adsorbate–adsorbate interactions. Examination of differential entropy change shows that for NaX and Zn(23)X zeolites, the adsorbed phase is in a state strongly localized, at least at low concentrations of zeolitic propene, whereas the adsorbed molecules, in the case of Zn(62)X, have a restricted 2D translational motion, throughout the entire coverage range. For Cu(x)X samples, the mobility of the adsorbed phase decreases with increasing adsorbate loading.

Journal of the Korean Chemical Society

Annales De Chimie-science Des Materiaux, 2001

Adsorption of carbon dioxide by X zeolites exchanged with bivalent cations. The adsorption of car... more Adsorption of carbon dioxide by X zeolites exchanged with bivalent cations. The adsorption of carbon dioxide by X zeolites exchanged by Mg*+, S?, Zn*+ and Cu*+ cations was studied by thermogravimetry. The corresponding isosteric heats of adsorption decrease with the filling of pore volume, except for Cu(63)X. This evolution of the heat indicates a specific interaction between cations present within supercages and CO2 molecules. Several models have been used in order to describe the experimental isotherms. The best fit of sorption isotherm data was obtained with the Sips model. R&urn6-L'adsorption de CO2 sur des zeolithes X &hang&s par les cations Mg*+, S4', Zn*+ et Cu2*, a tte Ctudike par thermogravimkrie. La determination des chaleurs isostkiques montre que celles-ci dtkroissent, de fagon spkifique 5 chaque cation, avec le taux de mmplissage, a l'exception de Cu(63)X. Ce changement de l't5volution de la chaleur r&le une interaction spkcifique entre les cations presents dans les supercages, et les molecules de COz. Plusieurs modules, par la suite, ont &5 utilisks, en vue de d&tire les isothermes expkimentales. C'est ainsi que les isothetmes d'adsorption de CO2 sur des zeolithes X kchangkes par des cations bivalents sont bien reprt?sentk par le mod&le de Sips.

In recent years, layered silicates have extensively been used to design new nanomaterials throug... more In recent years, layered silicates have extensively been used to design new nanomaterials through function-alization. In this work, the lamellar sodium silicates maga-diite and kenyaite have been hydrothermally synthesized in
presence of ethanol as organic co-solvent. Materials of high purity and high crystallinity were obtained after only 24 h of crystallization at a temperature of 180 °C for kenyaite and a temperature of 150 °C for magadiite. It appears that
the presence of ethanol in the synthesis medium tends not only to increase the crystallization rate, but also to stabilize the formation of magadiite.The as-synthesized Na-kenyaite was used as precursor for the preparation of titanium pillared clay materials. The resulting microporous titanium oxide pillared kenyaite materials exhibit large specific surface areas up to 180 m2g−1with a Ti contents up to 24 wt% and are active for the photocatalytic degradation under UV light irra-diation of the organic dye methyl orange in water.

In this paper, the Al-magadiite synthesized by hydrothermal method. It is then used to prepare th... more In this paper, the Al-magadiite synthesized by hydrothermal method. It is then used to prepare three copper exchanged materials using copper nitrate, copper chloride, and copper sulfate salts. The materials obtained were characterized and applied as antibacterial and antifungal against pathogen strains. The characterization methods showed the presence of four coordinated of aluminum atoms in the magadiite framework. The presence of aluminum leads to the total exchange of interlayer sodium cations. Otherwise, the copper exchange rate is influenced by the nature of the counter-ion used. Indeed, the exchanged rate increase in the sense of copper nitrate>copper chloride>copper sulfate. The chemical analysis shows that the ion exchange of Al-magadiite with copper salts is accompanied with dehydration of Cu-exchanged materials. This result was confirmed XRD diffraction, chemical analysis, and FTIR spectroscopy. This dehydration depends on the nature of the counter ion increase also in the sense of copper nitrate>copper chloride>copper sulfate. Tested as antibacterial and antifungal materials against pathogens strains all the copper exchanged materials exhibits a good antibacterial activity against Gram-positive bacteria which increased with increasing the copper content of a sample. The best activity was observed in the exchanged sample prepared from copper nitrate. However, a low or no activity is observed against Gram-negative bacteria.

MATEC Web of Conferences, 2013

Iron-containing SBA15 catalysts have been prepared following different synthesisroutes, direct sy... more Iron-containing SBA15 catalysts have been prepared following different synthesisroutes, direct synthesis by adjusting pH at 3 and 6 and with post synthesis procedure. Activity and stability of these materials were assessed on the photo-Fenton degradation of phenolic aqueous solutions by H 2 O 2 using near UV irradiation (254 nm) at room temperature and initial neutral pH. Their catalytic performance was mentioned in terms of phenol and total organic carbon (TOC) conversions. Several complementary techniques, including XRD, Nitrogen sorption isotherms, UV visible, were used to evaluate the final structural and textural properties of calcined Fe-SBA15 materials. These materials show a high activity and stability of iron species.

Arabian Journal of Chemistry, 2011

The condensation of sugar with fatty acids in an organic media is possible by chemical amidificat... more The condensation of sugar with fatty acids in an organic media is possible by chemical amidification without fastidious steps by hydroxyl group protection/deprotection. The acylation of sugar (N-methyl glucamine) with fatty acids (lauric acid, palmitic acid and stearic acid) is catalyzed in the presence of two inorganic and acid solid catalysts: Algerian clay called bentonite of Maghnia and mesoporous material of type (Al-MCM-41). The results obtained with this last solid (i.e. MCM-41) are very encouraging.

Mesoporous materials are very commonly used as adsorbent materials for removing phenolic compound... more Mesoporous materials are very commonly used as adsorbent materials for removing phenolic compounds. However, the adsorption mechanism of these compounds is still poorly controlled. However, understanding the interactions mesoporous materials/adsorbed molecules is very important in order to optimize the processes of liquid phase adsorption. The difficulty of synthesis is to keep an orderly and cubic pore structure and achieve a homogeneous surface modification. The grafting of Si(CH₃)₃ was chosen, to transform hydrophilic surfaces hydrophobic surfaces. The aim of this work is to study the kinetics and thermodynamics of two volatile organic compounds VOC phenol (PhOH) and P hydroxy benzoic acid (4AHB) on a mesoporous material of type MCM-48 grafted with an organosilane of the Trimethylchlorosilane (TMCS) type, the material thus grafted or functionalized (hereinafter referred to as MCM-48-G). In a first step, the kinetic and thermodynamic s...

Applied Catalysis A: General, 1999

ABSTRACT Adsorption of C3H6 has been carried out thermogravimetrically on M2+X zeolites (M2+=Zn2+... more ABSTRACT Adsorption of C3H6 has been carried out thermogravimetrically on M2+X zeolites (M2+=Zn2+ or Cu2+) exchanged at different degrees. The Gibbs energy change, the isosteric heat and the differential entropy change of C3H6 adsorbed at intervals of 20 K between 303 and 363 K are investigated. Analysis of the Gibbs energy change curves reveals particularly the character energetically heterogeneous of NaX and Zn(x)X samples with respect to the C3H6 adsorption. Evaluation of the isosteric heat shows that these adsorbents present strong adsorptive centre–adsorbate interactions, in contrast to Cu(x)X where it is noted the predominance of attractive adsorbate–adsorbate interactions. Examination of differential entropy change shows that for NaX and Zn(23)X zeolites, the adsorbed phase is in a state strongly localized, at least at low concentrations of zeolitic propene, whereas the adsorbed molecules, in the case of Zn(62)X, have a restricted 2D translational motion, throughout the entire coverage range. For Cu(x)X samples, the mobility of the adsorbed phase decreases with increasing adsorbate loading.

Journal of the Korean Chemical Society

Annales De Chimie-science Des Materiaux, 2001

Adsorption of carbon dioxide by X zeolites exchanged with bivalent cations. The adsorption of car... more Adsorption of carbon dioxide by X zeolites exchanged with bivalent cations. The adsorption of carbon dioxide by X zeolites exchanged by Mg*+, S?, Zn*+ and Cu*+ cations was studied by thermogravimetry. The corresponding isosteric heats of adsorption decrease with the filling of pore volume, except for Cu(63)X. This evolution of the heat indicates a specific interaction between cations present within supercages and CO2 molecules. Several models have been used in order to describe the experimental isotherms. The best fit of sorption isotherm data was obtained with the Sips model. R&urn6-L'adsorption de CO2 sur des zeolithes X &hang&s par les cations Mg*+, S4', Zn*+ et Cu2*, a tte Ctudike par thermogravimkrie. La determination des chaleurs isostkiques montre que celles-ci dtkroissent, de fagon spkifique 5 chaque cation, avec le taux de mmplissage, a l'exception de Cu(63)X. Ce changement de l't5volution de la chaleur r&le une interaction spkcifique entre les cations presents dans les supercages, et les molecules de COz. Plusieurs modules, par la suite, ont &5 utilisks, en vue de d&tire les isothermes expkimentales. C'est ainsi que les isothetmes d'adsorption de CO2 sur des zeolithes X kchangkes par des cations bivalents sont bien reprt?sentk par le mod&le de Sips.

In recent years, layered silicates have extensively been used to design new nanomaterials throug... more In recent years, layered silicates have extensively been used to design new nanomaterials through function-alization. In this work, the lamellar sodium silicates maga-diite and kenyaite have been hydrothermally synthesized in
presence of ethanol as organic co-solvent. Materials of high purity and high crystallinity were obtained after only 24 h of crystallization at a temperature of 180 °C for kenyaite and a temperature of 150 °C for magadiite. It appears that
the presence of ethanol in the synthesis medium tends not only to increase the crystallization rate, but also to stabilize the formation of magadiite.The as-synthesized Na-kenyaite was used as precursor for the preparation of titanium pillared clay materials. The resulting microporous titanium oxide pillared kenyaite materials exhibit large specific surface areas up to 180 m2g−1with a Ti contents up to 24 wt% and are active for the photocatalytic degradation under UV light irra-diation of the organic dye methyl orange in water.

In this paper, the Al-magadiite synthesized by hydrothermal method. It is then used to prepare th... more In this paper, the Al-magadiite synthesized by hydrothermal method. It is then used to prepare three copper exchanged materials using copper nitrate, copper chloride, and copper sulfate salts. The materials obtained were characterized and applied as antibacterial and antifungal against pathogen strains. The characterization methods showed the presence of four coordinated of aluminum atoms in the magadiite framework. The presence of aluminum leads to the total exchange of interlayer sodium cations. Otherwise, the copper exchange rate is influenced by the nature of the counter-ion used. Indeed, the exchanged rate increase in the sense of copper nitrate>copper chloride>copper sulfate. The chemical analysis shows that the ion exchange of Al-magadiite with copper salts is accompanied with dehydration of Cu-exchanged materials. This result was confirmed XRD diffraction, chemical analysis, and FTIR spectroscopy. This dehydration depends on the nature of the counter ion increase also in the sense of copper nitrate>copper chloride>copper sulfate. Tested as antibacterial and antifungal materials against pathogens strains all the copper exchanged materials exhibits a good antibacterial activity against Gram-positive bacteria which increased with increasing the copper content of a sample. The best activity was observed in the exchanged sample prepared from copper nitrate. However, a low or no activity is observed against Gram-negative bacteria.