Najib Tijani | Moulay Ismail University, Meknes, Morocco (original) (raw)
Papers by Najib Tijani
The present study aims to characterisation of ceramics tubulars supports elaborated from clay of ... more The present study aims to characterisation of ceramics tubulars supports elaborated from clay of the Meknes-Tafilalet region, with and without additions of organic matter, volume flow measurement by using a micro-pilot tangential filtration. And for this we IAICH Soulaiman ScienceLib Editions Mersenne : Volume 5 , N ° 130902 ISSN 2111-4706 2 carried out a series of measures such as: the flow variation as a function of time (D = f (t)), the final sintering temperature (D = f (TF)), the percentage of added organic matter (D = f (%MO)), and finally depending on the transmembrane pressure (D = f (P)). The results obtained in this study, show that the flow is decreases with time and increases with the percentage of organic matter, with the final sintering temperature and with pressure, and the flow is also very important (10000 l/h.m to a pressure of 3 bar) for supports with 15 % of organic matter sintered at 1000°C for 3h. Key-words: Drinking water, Flow, Pressure, Permeability, Support...
Journal de Physique IV (Proceedings), 2005
ABSTRACT The influence of pH and electrostatic interactions on the fouling mechanism during prote... more ABSTRACT The influence of pH and electrostatic interactions on the fouling mechanism during protein dead-end microfiltration (MF) has been investigated for two charged membranes. Polyethersulfone acidic membranes (ICE-450), being negatively charged, and basic ones (SB-6407), these positively charged, both from Pall Co., have been used in the investigations. BSA and Lysozyme solutions at different pH values (3.0, 5.0, 7.0, 8.5 and 10.0) were microfiltered through the membranes at a constant applied transmembrane pressure. Results have been analysed in terms of usual blocking filtration laws and a substantial change in the fouling behaviour has been observed when solution pH and/or membrane charge as the pressure was changed, this change being clearly related with the specific membrane-protein and protein-protein interactions.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007
The influence of pH and electrostatic interactions on the fouling mechanism during protein dead-e... more The influence of pH and electrostatic interactions on the fouling mechanism during protein dead-end microfiltration (MF) has been investigated for two charged membranes. Polyethersulfone negatively charged membranes (ICE-450) and positively charged ones (SB-6407) have been used, both manufactured by Pall Co. The corresponding electrical properties of both the membranes have been investigated as a function of pH by streaming potential measurements; confirming the respective sign of their surface charges and the absence of any isoelectric point. BSA and Lysozyme solutions at different pH values (3.0, 5.0, 7.0, 8.5 and 10.0) were microfiltered through the membranes at a constant applied pressure. Results have been analysed in terms of usual blocking filtration laws and substantial changes in the fouling behaviour have been observed as a function of the solution pH. In these conditions, fouling behaviour is determined by protein charge rather than membrane charge.
Journal of Saudi Chemical Society, 2021
Abstract The present work was designed to synthesize novel NaY and Ni modified NaY (Ni-NaY) zeoli... more Abstract The present work was designed to synthesize novel NaY and Ni modified NaY (Ni-NaY) zeolites for efficient removal of phenol from aqueous solution. The Ni-NaY (FAU, Si/Al=2.56) was prepared by ion-exchange method at 873 K and pH=5.8. The characterization of NaY and Ni-NaY was done by EDX, FTIR, ATD/TGA, BET, SEM, and XRD. Characterization results revealed that Ni-NaY showed an increased surface area and pore volume compared to NaY. The phenol adsorption reached the equilibrium within 2h at pH=4. A comparative study indicated that Ni-NaY exhibited a high adsorption capacity of phenol compared to NaY, with an average removal of 77.20% and 88.79 % by NaY and Ni-NaY, respectively. The low coordination number of Ni cations in NaY structure and the ability of this zeolite to stabilize Ni cations in low-valence states were the main reasons for its superior adsorption performance compared with NaY. The experimental adsorption data were applied to different adsorption and kinetic models to understand the adsorption mechanism. Results indicated that the Freundlich model and pseudo-second order fited the adsorption of phenol on NaY and Ni-NaY. The phenol adsorption on NaY and Ni-NaY zeolite was mediated principally via hydrogen bonding between the hydroxyl (OH) group of phenol and silanol groups of the Ni-NaY zeolite surface. Results also showed that after 5 cycles of regeneration, Ni-NaY had a removal efficiency higher than 90%, which demonstrated an excellent reproducibility of modified zeolite as an adsorbent.
The Scientific World Journal, 2021
Almond production generates a large number of coproducts, but the farmer’s interest mainly focuse... more Almond production generates a large number of coproducts, but the farmer’s interest mainly focuses on the nutritional and commercial aspects of the kernel for getting the best return from their harvests. Thus, almond coproducts such as almond shells that represent more than 70% of biomass remain underexplored. In this work, the suitability of almond shell powder (ASP) as a natural low-cost adsorbent was evaluated in the adsorption of brilliant green dye (BG), which is known as a chemical pollutant. Brunauer–Emmett–Teller (BET) method, for the determination of specific surface area, Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) techniques were performed to characterize the ASP adsorbent. The batch adsorption kinetic study for the removal of BG dye was carried out by varying pH, temperature, initial concentration of the dye, bioadsorbent dose, and contact time. It was found that 98% of BG dye is removed under the following optimal experimental ...
Moroccan Journal of Chemistry, 2020
The purpose of this work is to study the performance of a membrane based on Ghassoul and Hydrotal... more The purpose of this work is to study the performance of a membrane based on Ghassoul and Hydrotalcite (GHTM) in the retention of polyphenols (organic pollutants). This membrane was elaborated and characterized in our laboratory and was used in the filtration of olive mill wastewaters (OMW) of semi-modern unit of the olives. The choice of these materials depends essentially on their interesting properties (low cost, abundantly in nature and the ease of the preparation).The diluted OMW (40%, 60% and 80%) were very acidic with a pH between 5.29-5.64 and had a high concentration of polyphenols from 30-60mg/L. However, after treatment the permeate revealed a significant decrease in polyphenols of61% and a complete disappearance of brown coloration for 80% OMW. The results show that the membrane developed is efficient to remove the polyphenols and reduce the turbidity, COD and BOD5 of OMW.
Microporous and Mesoporous Materials, Mar 1, 2022
The objective of this work is focused on the preparation and characterization of plan microfiltra... more The objective of this work is focused on the preparation and characterization of plan microfiltration membrane Zn 3 Al-Gh and the study of their efficiency in the treatment of ground water. This membrane was carried by using the support of the clay such as Ghassoul 'Gh' prepared by using dry uniaxial compaction method. The layered double hydroxides (LDH) based on Zn 3 Al-CO 3 with molar ratio (Zn 2+ /Al 3+ =3) was deposited on support by direct co-precipitation method. The characterizations of the membrane LDH-Gh 'Zn 3 Al-Gh' and deposited layer Zn 3 Al-CO 3, was done by scanning electron microscopy analysis (SEM), X-ray diffraction (XRD), porosity and Fourier Transform Infrared Spectroscopy (FTIR),and shows that the deposition of the Zn 3 Al-CO 3 was carried on the Ghassoul support successfully. The chemical resistance and pure water permeability tests suggest the use of the Zn 3 Al-Gh membrane for the microfiltration applications. In this context, the performance of Zn 3 Al-Gh membrane has been used in attempt to remove the indicator bacteria of fecal pollution, and eventually pathogenic bacteria in company with them, which are existing in groundwater of the urban commune "Sebaa-Ayoune" (Fez-Meknes region, Morocco). The analysis of the samples of water after and before microfiltration showed the bacteria removal is important for all germs indicating of fecal pollution. On the other hand, the diminution of the turbidity, the conductivity and the concentration of Ca 2+ , SO 4 2-, NO 3 and NH 4 + were established.
DESALINATION AND WATER TREATMENT
Arabian Journal of Chemistry
DESALINATION AND WATER TREATMENT
In the present study, a clay-based membrane support (m-S), and X-type zeolite, and a composite cl... more In the present study, a clay-based membrane support (m-S), and X-type zeolite, and a composite clay/zeolite membrane (m-ZX) were prepared. Membrane supports in the form of a flat-disc were prepared by uniaxial pressing of a mixture of clay and starch (12.0%, w/w starch/clay). The results of X-ray diffraction confirms the formation of X-type zeolite. While the scanning electron microscopy analysis shows the formation of fine particles with a crystal size between 1.47 and 2.08 µm with an octahedral shape. The nitrogen adsorption analysis showed that the specific surface area of the membrane support was 0.7655 m 2 •g-1 with an average pore diameter of 122.2 Å. While the specific surface area of X-type zeolite was 316.95 m 2 •g-1 with an average pore diameter of 19.7127 Å. The initial water permeation fluxes begin with valued of 1,018 and 380 Lm-2 •h-1 for the membrane support (m-S) and the composite membrane (m-ZX), respectively. On the other hand, the filtration of the Eriochrome Black T (EBT) dye by m-S and m-ZX showed retention percentages of 38% and 69%, respectively. This clearly demonstrates the significant enhancement of retention of the dye on the m-ZX membrane. The points of zero charge (pzc) of the membrane support and X-type zeolite were pHpzc = 8.77 and pHpzc = 10.2, respectively. Filtration of the EBT dye was carried out at a pH of 8.2. This indicates that the membrane surface was positively charged while the EBT was negatively charged. The mechanism of the dye filtration was dominated by the size of the EBT molecule and that of the membrane pores, and also by the adsorption of the dye on the membrane due to the attraction between the negative charge of EBT and the positive charge on the membrane surface.
Microporous and Mesoporous Materials
Membranes, 2021
The present work describes the deposition of two zeolite films, sodalite and faujasite, by the hy... more The present work describes the deposition of two zeolite films, sodalite and faujasite, by the hydrothermal method to tune the mesopores of clay support, which are prepared from a widely available clay depot from the central region of Morocco (Midelt). The clay supports were prepared by a powder metallurgy method from different granulometries with activated carbon as a porosity agent, using uniaxial compression followed by a sintering process. The 160 µm ≤ Φ ≤ 250 µm support showed the highest water flux compared to the supports made from smaller granulometries with a minimum water flux of 1405 L.m−2·h−1 after a working time of 2 h and 90 min. This support was chosen for the deposition of sodalite (SOM) and faujasite (FAM) zeolite membranes. The X-ray diffraction of sodalite and faujasite showed that they were well crystallized, and the obtained spectra corresponded well with the sought phases. Such findings were confirmed by the SEM analysis, which showed that SOM was crystalized a...
SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
Data in Brief, 2020
This article describes the data generated from multiple approach methodology physico-chemical cha... more This article describes the data generated from multiple approach methodology physico-chemical characterization of a clay mineral from the West-Central region of Morocco, Safi province (
Heliyon, 2019
Erratum to "Characterization of the firing behaviour of an illite-kaolinite clay mineral and its ... more Erratum to "Characterization of the firing behaviour of an illite-kaolinite clay mineral and its potential use as membrane support" [Heliyon 5, (8), (August 2019), e02281]
Data in Brief, 2018
The data presented in this article are generated as part of the research article entitled "from a... more The data presented in this article are generated as part of the research article entitled "from a naturally occurring material (clay mineral) to the production of porous ceramic membranes" (Elgamouz and Tijani, 2018) [1]. This article describe how clays as very abundant versatile materials that have many properties not available in pure materials namely, silica, alumina and zirconia can be used for the preparation of ceramic membranes (Karaborni et al., 1996; Oun et al., 2017; Hollanders et al., 2016; de Oliveira Henriques et al., 2017) [2-5]. This paper presents data obtained at different stages of the fabrication of a clay-zeolite composite ceramic membrane made from a largely available clay from the central region of Morocco (Meknes). The data include the characterization of the clay powder using XRD, FTIR, thermogravimetric (TGA and TDA) analysis of the clay powder. The data of porosity, mesoporosity, specific surface area, volumes of the pores, volumes of mesopores, diameters of the pores using mercury intrusion porosimetry and adsorption desorption of nitrogen data that was computed from BET and BJH theories of the clay supports at different firing temperatures (700, 750, 800, 850 and 900°C).
Microporous and Mesoporous Materials, 2018
A silicalite clay composite membrane was produced by hydrothermal deposition using tetraethyl ort... more A silicalite clay composite membrane was produced by hydrothermal deposition using tetraethyl orthosilicate (TEOS) as silica source, tetra-n-propylammonium bromide (TPABr) as template and KOH as mineralizing agent. Silicalite was deposited in the mesopores and on the surface of porous ceramic membrane supports made from a naturally available clay mineral abundantly found in the central region of Morocco (Meknès). Three flat-disc membrane supports were prepared by uniaxial pressure on pure clay powder (AS), mixture of clay and activated carbon (5%, w/w) (AC) and mixture of clay and starch (20% w/w) (AA). The porosity of membrane supports was studied as function of the final calcination temperature. It was found that the mesopores contribution to porosity was 25%, however their contribution to the specific surface area is more than 90%. The mesopores structure was investigated. XRD confirms the formation of crystalline silicalite layers inside the mesopores of the clay flat-disc supports. Typical MFI-type zeolite morphology was confirmed by SEM. The scope and limitations of the membranes in terms of selectivity between SF 6 and N 2 , is discussed.
Tropical Journal of Pharmaceutical Research, 2013
Purpose: To assess the antioxidant and antimicrobial activities of polyphenolic extracts of three... more Purpose: To assess the antioxidant and antimicrobial activities of polyphenolic extracts of three wild red wild berry fruit species from Southeast Serbia, viz, European cornel (Cornus mas), blackthorn (Prunus spinosa L.) and wild blackberry (Rubus fruticosus). Methods: Polyphenol content was determined using spectrophotometric and High performance liquid chromatography (HPLC) methods. Antioxidant activity was estimated by 2,2`-diphenyl-1picrylhydrazyl (DPPH) test while reliminary antimicrobial tests were carried out by disc diffusion method in which antibacterial activity was evaluated by measuring the zone of inhibition against test bacterial strains. Broth microdilution method was used to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). Results: The highest amount of total phenols was found in European cornel (8625.89 mg kg-1 FW). Galic acid, caffeic acid, p-coumaric acid, ferulic acid, (+)-catechin, procyanidin B2, (-)-epicatechin, quercetin, rutin and quercetin-3-glucoside were the main polyphenols in the fruit extracts. All extracts showed high scavenging effect on DPPH radical with IC50 values ranging from 22.19 to 31.18 ml g-1 , as well as high antimicrobial activity on almost all the tested bacterial strains. Conclusion: Extracts of wild berry fruits may be suitable for the preparation of medicinal and nutritional products.
The present study aims to characterisation of ceramics tubulars supports elaborated from clay of ... more The present study aims to characterisation of ceramics tubulars supports elaborated from clay of the Meknes-Tafilalet region, with and without additions of organic matter, volume flow measurement by using a micro-pilot tangential filtration. And for this we IAICH Soulaiman ScienceLib Editions Mersenne : Volume 5 , N ° 130902 ISSN 2111-4706 2 carried out a series of measures such as: the flow variation as a function of time (D = f (t)), the final sintering temperature (D = f (TF)), the percentage of added organic matter (D = f (%MO)), and finally depending on the transmembrane pressure (D = f (P)). The results obtained in this study, show that the flow is decreases with time and increases with the percentage of organic matter, with the final sintering temperature and with pressure, and the flow is also very important (10000 l/h.m to a pressure of 3 bar) for supports with 15 % of organic matter sintered at 1000°C for 3h. Key-words: Drinking water, Flow, Pressure, Permeability, Support...
Journal de Physique IV (Proceedings), 2005
ABSTRACT The influence of pH and electrostatic interactions on the fouling mechanism during prote... more ABSTRACT The influence of pH and electrostatic interactions on the fouling mechanism during protein dead-end microfiltration (MF) has been investigated for two charged membranes. Polyethersulfone acidic membranes (ICE-450), being negatively charged, and basic ones (SB-6407), these positively charged, both from Pall Co., have been used in the investigations. BSA and Lysozyme solutions at different pH values (3.0, 5.0, 7.0, 8.5 and 10.0) were microfiltered through the membranes at a constant applied transmembrane pressure. Results have been analysed in terms of usual blocking filtration laws and a substantial change in the fouling behaviour has been observed when solution pH and/or membrane charge as the pressure was changed, this change being clearly related with the specific membrane-protein and protein-protein interactions.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007
The influence of pH and electrostatic interactions on the fouling mechanism during protein dead-e... more The influence of pH and electrostatic interactions on the fouling mechanism during protein dead-end microfiltration (MF) has been investigated for two charged membranes. Polyethersulfone negatively charged membranes (ICE-450) and positively charged ones (SB-6407) have been used, both manufactured by Pall Co. The corresponding electrical properties of both the membranes have been investigated as a function of pH by streaming potential measurements; confirming the respective sign of their surface charges and the absence of any isoelectric point. BSA and Lysozyme solutions at different pH values (3.0, 5.0, 7.0, 8.5 and 10.0) were microfiltered through the membranes at a constant applied pressure. Results have been analysed in terms of usual blocking filtration laws and substantial changes in the fouling behaviour have been observed as a function of the solution pH. In these conditions, fouling behaviour is determined by protein charge rather than membrane charge.
Journal of Saudi Chemical Society, 2021
Abstract The present work was designed to synthesize novel NaY and Ni modified NaY (Ni-NaY) zeoli... more Abstract The present work was designed to synthesize novel NaY and Ni modified NaY (Ni-NaY) zeolites for efficient removal of phenol from aqueous solution. The Ni-NaY (FAU, Si/Al=2.56) was prepared by ion-exchange method at 873 K and pH=5.8. The characterization of NaY and Ni-NaY was done by EDX, FTIR, ATD/TGA, BET, SEM, and XRD. Characterization results revealed that Ni-NaY showed an increased surface area and pore volume compared to NaY. The phenol adsorption reached the equilibrium within 2h at pH=4. A comparative study indicated that Ni-NaY exhibited a high adsorption capacity of phenol compared to NaY, with an average removal of 77.20% and 88.79 % by NaY and Ni-NaY, respectively. The low coordination number of Ni cations in NaY structure and the ability of this zeolite to stabilize Ni cations in low-valence states were the main reasons for its superior adsorption performance compared with NaY. The experimental adsorption data were applied to different adsorption and kinetic models to understand the adsorption mechanism. Results indicated that the Freundlich model and pseudo-second order fited the adsorption of phenol on NaY and Ni-NaY. The phenol adsorption on NaY and Ni-NaY zeolite was mediated principally via hydrogen bonding between the hydroxyl (OH) group of phenol and silanol groups of the Ni-NaY zeolite surface. Results also showed that after 5 cycles of regeneration, Ni-NaY had a removal efficiency higher than 90%, which demonstrated an excellent reproducibility of modified zeolite as an adsorbent.
The Scientific World Journal, 2021
Almond production generates a large number of coproducts, but the farmer’s interest mainly focuse... more Almond production generates a large number of coproducts, but the farmer’s interest mainly focuses on the nutritional and commercial aspects of the kernel for getting the best return from their harvests. Thus, almond coproducts such as almond shells that represent more than 70% of biomass remain underexplored. In this work, the suitability of almond shell powder (ASP) as a natural low-cost adsorbent was evaluated in the adsorption of brilliant green dye (BG), which is known as a chemical pollutant. Brunauer–Emmett–Teller (BET) method, for the determination of specific surface area, Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) techniques were performed to characterize the ASP adsorbent. The batch adsorption kinetic study for the removal of BG dye was carried out by varying pH, temperature, initial concentration of the dye, bioadsorbent dose, and contact time. It was found that 98% of BG dye is removed under the following optimal experimental ...
Moroccan Journal of Chemistry, 2020
The purpose of this work is to study the performance of a membrane based on Ghassoul and Hydrotal... more The purpose of this work is to study the performance of a membrane based on Ghassoul and Hydrotalcite (GHTM) in the retention of polyphenols (organic pollutants). This membrane was elaborated and characterized in our laboratory and was used in the filtration of olive mill wastewaters (OMW) of semi-modern unit of the olives. The choice of these materials depends essentially on their interesting properties (low cost, abundantly in nature and the ease of the preparation).The diluted OMW (40%, 60% and 80%) were very acidic with a pH between 5.29-5.64 and had a high concentration of polyphenols from 30-60mg/L. However, after treatment the permeate revealed a significant decrease in polyphenols of61% and a complete disappearance of brown coloration for 80% OMW. The results show that the membrane developed is efficient to remove the polyphenols and reduce the turbidity, COD and BOD5 of OMW.
Microporous and Mesoporous Materials, Mar 1, 2022
The objective of this work is focused on the preparation and characterization of plan microfiltra... more The objective of this work is focused on the preparation and characterization of plan microfiltration membrane Zn 3 Al-Gh and the study of their efficiency in the treatment of ground water. This membrane was carried by using the support of the clay such as Ghassoul 'Gh' prepared by using dry uniaxial compaction method. The layered double hydroxides (LDH) based on Zn 3 Al-CO 3 with molar ratio (Zn 2+ /Al 3+ =3) was deposited on support by direct co-precipitation method. The characterizations of the membrane LDH-Gh 'Zn 3 Al-Gh' and deposited layer Zn 3 Al-CO 3, was done by scanning electron microscopy analysis (SEM), X-ray diffraction (XRD), porosity and Fourier Transform Infrared Spectroscopy (FTIR),and shows that the deposition of the Zn 3 Al-CO 3 was carried on the Ghassoul support successfully. The chemical resistance and pure water permeability tests suggest the use of the Zn 3 Al-Gh membrane for the microfiltration applications. In this context, the performance of Zn 3 Al-Gh membrane has been used in attempt to remove the indicator bacteria of fecal pollution, and eventually pathogenic bacteria in company with them, which are existing in groundwater of the urban commune "Sebaa-Ayoune" (Fez-Meknes region, Morocco). The analysis of the samples of water after and before microfiltration showed the bacteria removal is important for all germs indicating of fecal pollution. On the other hand, the diminution of the turbidity, the conductivity and the concentration of Ca 2+ , SO 4 2-, NO 3 and NH 4 + were established.
DESALINATION AND WATER TREATMENT
Arabian Journal of Chemistry
DESALINATION AND WATER TREATMENT
In the present study, a clay-based membrane support (m-S), and X-type zeolite, and a composite cl... more In the present study, a clay-based membrane support (m-S), and X-type zeolite, and a composite clay/zeolite membrane (m-ZX) were prepared. Membrane supports in the form of a flat-disc were prepared by uniaxial pressing of a mixture of clay and starch (12.0%, w/w starch/clay). The results of X-ray diffraction confirms the formation of X-type zeolite. While the scanning electron microscopy analysis shows the formation of fine particles with a crystal size between 1.47 and 2.08 µm with an octahedral shape. The nitrogen adsorption analysis showed that the specific surface area of the membrane support was 0.7655 m 2 •g-1 with an average pore diameter of 122.2 Å. While the specific surface area of X-type zeolite was 316.95 m 2 •g-1 with an average pore diameter of 19.7127 Å. The initial water permeation fluxes begin with valued of 1,018 and 380 Lm-2 •h-1 for the membrane support (m-S) and the composite membrane (m-ZX), respectively. On the other hand, the filtration of the Eriochrome Black T (EBT) dye by m-S and m-ZX showed retention percentages of 38% and 69%, respectively. This clearly demonstrates the significant enhancement of retention of the dye on the m-ZX membrane. The points of zero charge (pzc) of the membrane support and X-type zeolite were pHpzc = 8.77 and pHpzc = 10.2, respectively. Filtration of the EBT dye was carried out at a pH of 8.2. This indicates that the membrane surface was positively charged while the EBT was negatively charged. The mechanism of the dye filtration was dominated by the size of the EBT molecule and that of the membrane pores, and also by the adsorption of the dye on the membrane due to the attraction between the negative charge of EBT and the positive charge on the membrane surface.
Microporous and Mesoporous Materials
Membranes, 2021
The present work describes the deposition of two zeolite films, sodalite and faujasite, by the hy... more The present work describes the deposition of two zeolite films, sodalite and faujasite, by the hydrothermal method to tune the mesopores of clay support, which are prepared from a widely available clay depot from the central region of Morocco (Midelt). The clay supports were prepared by a powder metallurgy method from different granulometries with activated carbon as a porosity agent, using uniaxial compression followed by a sintering process. The 160 µm ≤ Φ ≤ 250 µm support showed the highest water flux compared to the supports made from smaller granulometries with a minimum water flux of 1405 L.m−2·h−1 after a working time of 2 h and 90 min. This support was chosen for the deposition of sodalite (SOM) and faujasite (FAM) zeolite membranes. The X-ray diffraction of sodalite and faujasite showed that they were well crystallized, and the obtained spectra corresponded well with the sought phases. Such findings were confirmed by the SEM analysis, which showed that SOM was crystalized a...
SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
Data in Brief, 2020
This article describes the data generated from multiple approach methodology physico-chemical cha... more This article describes the data generated from multiple approach methodology physico-chemical characterization of a clay mineral from the West-Central region of Morocco, Safi province (
Heliyon, 2019
Erratum to "Characterization of the firing behaviour of an illite-kaolinite clay mineral and its ... more Erratum to "Characterization of the firing behaviour of an illite-kaolinite clay mineral and its potential use as membrane support" [Heliyon 5, (8), (August 2019), e02281]
Data in Brief, 2018
The data presented in this article are generated as part of the research article entitled "from a... more The data presented in this article are generated as part of the research article entitled "from a naturally occurring material (clay mineral) to the production of porous ceramic membranes" (Elgamouz and Tijani, 2018) [1]. This article describe how clays as very abundant versatile materials that have many properties not available in pure materials namely, silica, alumina and zirconia can be used for the preparation of ceramic membranes (Karaborni et al., 1996; Oun et al., 2017; Hollanders et al., 2016; de Oliveira Henriques et al., 2017) [2-5]. This paper presents data obtained at different stages of the fabrication of a clay-zeolite composite ceramic membrane made from a largely available clay from the central region of Morocco (Meknes). The data include the characterization of the clay powder using XRD, FTIR, thermogravimetric (TGA and TDA) analysis of the clay powder. The data of porosity, mesoporosity, specific surface area, volumes of the pores, volumes of mesopores, diameters of the pores using mercury intrusion porosimetry and adsorption desorption of nitrogen data that was computed from BET and BJH theories of the clay supports at different firing temperatures (700, 750, 800, 850 and 900°C).
Microporous and Mesoporous Materials, 2018
A silicalite clay composite membrane was produced by hydrothermal deposition using tetraethyl ort... more A silicalite clay composite membrane was produced by hydrothermal deposition using tetraethyl orthosilicate (TEOS) as silica source, tetra-n-propylammonium bromide (TPABr) as template and KOH as mineralizing agent. Silicalite was deposited in the mesopores and on the surface of porous ceramic membrane supports made from a naturally available clay mineral abundantly found in the central region of Morocco (Meknès). Three flat-disc membrane supports were prepared by uniaxial pressure on pure clay powder (AS), mixture of clay and activated carbon (5%, w/w) (AC) and mixture of clay and starch (20% w/w) (AA). The porosity of membrane supports was studied as function of the final calcination temperature. It was found that the mesopores contribution to porosity was 25%, however their contribution to the specific surface area is more than 90%. The mesopores structure was investigated. XRD confirms the formation of crystalline silicalite layers inside the mesopores of the clay flat-disc supports. Typical MFI-type zeolite morphology was confirmed by SEM. The scope and limitations of the membranes in terms of selectivity between SF 6 and N 2 , is discussed.
Tropical Journal of Pharmaceutical Research, 2013
Purpose: To assess the antioxidant and antimicrobial activities of polyphenolic extracts of three... more Purpose: To assess the antioxidant and antimicrobial activities of polyphenolic extracts of three wild red wild berry fruit species from Southeast Serbia, viz, European cornel (Cornus mas), blackthorn (Prunus spinosa L.) and wild blackberry (Rubus fruticosus). Methods: Polyphenol content was determined using spectrophotometric and High performance liquid chromatography (HPLC) methods. Antioxidant activity was estimated by 2,2`-diphenyl-1picrylhydrazyl (DPPH) test while reliminary antimicrobial tests were carried out by disc diffusion method in which antibacterial activity was evaluated by measuring the zone of inhibition against test bacterial strains. Broth microdilution method was used to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). Results: The highest amount of total phenols was found in European cornel (8625.89 mg kg-1 FW). Galic acid, caffeic acid, p-coumaric acid, ferulic acid, (+)-catechin, procyanidin B2, (-)-epicatechin, quercetin, rutin and quercetin-3-glucoside were the main polyphenols in the fruit extracts. All extracts showed high scavenging effect on DPPH radical with IC50 values ranging from 22.19 to 31.18 ml g-1 , as well as high antimicrobial activity on almost all the tested bacterial strains. Conclusion: Extracts of wild berry fruits may be suitable for the preparation of medicinal and nutritional products.