Meriem MANSOUR - Academia.edu (original) (raw)
Papers by Meriem MANSOUR
DESALINATION AND WATER TREATMENT, Dec 31, 2022
World Academy of Science, Engineering and Technology, International Journal of Chemical and Molecular Engineering, Jul 29, 2015
World Academy of Science, Engineering and Technology, International Journal of Civil and Environmental Engineering, Apr 27, 2015
World Academy of Science, Engineering and Technology, International Journal of Environmental and Ecological Engineering, Sep 26, 2016
Toxicological & Environmental Chemistry, 2003
... 5. El Ghazi I. Elamrani MK Chafik A. Benhra A. 1997 Proceeding Second Mediterranean Basin Co... more ... 5. El Ghazi I. Elamrani MK Chafik A. Benhra A. 1997 Proceeding Second Mediterranean Basin Conference on Analytical Chemistry p. 74; 6. Hermann, JM, Disdier, J., Pichat, P ... Chem. Rev., 95: 69 [CrossRef], [Web of Science ®]; 9. Khalil, LB, Mourad, WE and Rophael, MW 1998 ...
Urologii͡a i nefrologii͡a
World Academy of Science, Engineering and Technology, International Journal of Civil and Environmental Engineering, 2015
Applied Surface Science, 2019
Abstract In this study, a comparison between two methods of synthesis of Bi2O3-ZnO composite depo... more Abstract In this study, a comparison between two methods of synthesis of Bi2O3-ZnO composite deposited on glass wool (GW) was conducted via the layered double hydroxide (LDH) synthesis route followed by treatment at 450 °C. The obtained materials were characterized by TGA, XDR, SEM, BET, XPS and UV–visible DRS. Characterization results showed two structures identified as LDH and (BiO)2CO3 with and without GW before heat treatment. Bi2O3-ZnO composite was obtained after treatment at 450 °C; however, solvothermal synthesis with GW would appear to be better than that of hydrothermal. Indeed, the material prepared by solvothermal with GW then treated at 450 °C has good crystallinity, high specific surface and lowest band gap energy compared to materials synthesized by hydrothermal. Furthermore, this material showed photocatalytic efficiency of 20 min for a total discoloration of the indigo carmine (IC), this was the best time of discoloration obtained compared to other materials and others from the literature. Identification of the responsible species for the photo-discoloration was conducted and the result showed that the species responsible for the dye discoloration was the radical superoxide anion with a small contribution of the e−/h+ pair. It appears that the hydroxyl radical didn't contribute in this discoloration mechanism.
Journal of Hazardous Materials, 2015
In this work, a co-doped Bi-Zn-TiO2 photocatalist is synthesized by an original synthesis route o... more In this work, a co-doped Bi-Zn-TiO2 photocatalist is synthesized by an original synthesis route of layered double hydroxide followed by heat treatment at 670°C. After characterization the photocatalyst efficiency is estimated by the photo-discoloration of an anionic dye (indigo carmine) under visible light and compare to TiO2-P25 as reference material. In this new photocatalyst, anatase and ZnO wurtzite are the only identified crystalline phase, rutile and Bi2O3 being undetected. Moreover, the binding energy of Bi determined (XPS analysis) is different from the one of Bi in Bi2O3. Compared to TiO2-P25, the absorption is red shifted (UV-vis DRS) and the Bi-Zn-TiO2 photocatalyst showed sorption capacity toward indigo carmine higher than that TiO2-P25. The kinetics of the photo-discoloration is faster with Bi-Zn-TiO2 than with TiO2-P25. Indeed, a complete discoloration is obtained after 70min and 120min in the presence of Bi-Zn-TiO2 and TiO2-P25 respectively. The identification of the responsible species on photo-discoloration was carried out in the presence of different scavengers. The study showed that the first responsible is h(+) specie with a moderate contribution of superoxide anion radical and a minor contribution of the hydroxyl radical. The material showed high stability after five uses with the same rate of photo-discoloration.
DESALINATION AND WATER TREATMENT, 2023
BiOI/Bi 2 O 3 /MgO hetero-structured (B/B/M) was prepared by a hydrothermal method and then calci... more BiOI/Bi 2 O 3 /MgO hetero-structured (B/B/M) was prepared by a hydrothermal method and then calcined at different temperatures (200°C, 300°C, 400°C, and 550°C) for 1 h. The efficiency of photocatalyst was tested on the photo-discoloration of a cationic dye (Rhodamine B (RhB)) under visible light (500 W tungsten lamp (Tungsram Trademark) that emits more than 400 nm) and compared to Bi 2 O 3 , TiO 2-P25 and BiOI as reference photocatalysts. The prepared samples were characterized by X-ray diffraction, Brunauer-Emmett-Teller, UV-Visible diffuse reflectance spectroscopy and scanning electron microscopy. In this new photocatalysts, three structures have been identified BiOI, Bi 2 O 3 , and MgO before and after heat treatment. Indeed, the sample prepared and calcined at 400°C/1 h show a good crystallinity and display microspheres porous in the form of cauliflower-like. Furthermore, the photocatalytic test of B/B/M-400 has shown efficiency on the photodegradation of RhB. Indeed, a total discoloration of 10 mg/L of RhB was achieved at 110 min.
World Academy of Science, Engineering and Technology, International Journal of Environmental and Ecological Engineering, 2015
Applied Surface Science, 2020
It is reported that a dual-layer carbon film on SiC wafer is prepared using carbide-derived carbo... more It is reported that a dual-layer carbon film on SiC wafer is prepared using carbide-derived carbon (CDC) process with subsequent chemical vapor deposition (CVD). The dual-layer film includes a sub-layer of CDC and a top layer of CVD, which are prepared by chlorination of SiC and pyrolysis of CCl 4 at high temperature respectively. The CDC and CVD layers are mainly amorphous. And similar dispersion effects are observed in the Raman spectra, although the D-band position of the CVD layer shifts to higher wavenumber (~1354 cm −1) than that of the CDC layer (~1337 cm −1). Surface chemistry analysis suggests that the unstable chemical bonds, mainly C-Cl, as well as dangling bonds in the CDC layer play an important role in promoting the nucleation of CVD carbon. The surface morphology evolvement from SiC wafer to CDC layer and to dual-layer film is investigated by atomic force microscopy [AFM] and field emission scanning electronic microscopy [FESEM]. The nanoporous surface formed in the CDC process is favorable for capturing carbon species from the gas phase and can act as a "seedbed" for the nucleation and growth of CVD layer. The primary tribological study indicates that the dual-layer film shows great advantages in friction reduction and wear resistance with comparison to SiC and CDC layer, suggesting its potential in lubrication for SiC-based moving components.
DESALINATION AND WATER TREATMENT, Dec 31, 2022
World Academy of Science, Engineering and Technology, International Journal of Chemical and Molecular Engineering, Jul 29, 2015
World Academy of Science, Engineering and Technology, International Journal of Civil and Environmental Engineering, Apr 27, 2015
World Academy of Science, Engineering and Technology, International Journal of Environmental and Ecological Engineering, Sep 26, 2016
Toxicological & Environmental Chemistry, 2003
... 5. El Ghazi I. Elamrani MK Chafik A. Benhra A. 1997 Proceeding Second Mediterranean Basin Co... more ... 5. El Ghazi I. Elamrani MK Chafik A. Benhra A. 1997 Proceeding Second Mediterranean Basin Conference on Analytical Chemistry p. 74; 6. Hermann, JM, Disdier, J., Pichat, P ... Chem. Rev., 95: 69 [CrossRef], [Web of Science ®]; 9. Khalil, LB, Mourad, WE and Rophael, MW 1998 ...
Urologii͡a i nefrologii͡a
World Academy of Science, Engineering and Technology, International Journal of Civil and Environmental Engineering, 2015
Applied Surface Science, 2019
Abstract In this study, a comparison between two methods of synthesis of Bi2O3-ZnO composite depo... more Abstract In this study, a comparison between two methods of synthesis of Bi2O3-ZnO composite deposited on glass wool (GW) was conducted via the layered double hydroxide (LDH) synthesis route followed by treatment at 450 °C. The obtained materials were characterized by TGA, XDR, SEM, BET, XPS and UV–visible DRS. Characterization results showed two structures identified as LDH and (BiO)2CO3 with and without GW before heat treatment. Bi2O3-ZnO composite was obtained after treatment at 450 °C; however, solvothermal synthesis with GW would appear to be better than that of hydrothermal. Indeed, the material prepared by solvothermal with GW then treated at 450 °C has good crystallinity, high specific surface and lowest band gap energy compared to materials synthesized by hydrothermal. Furthermore, this material showed photocatalytic efficiency of 20 min for a total discoloration of the indigo carmine (IC), this was the best time of discoloration obtained compared to other materials and others from the literature. Identification of the responsible species for the photo-discoloration was conducted and the result showed that the species responsible for the dye discoloration was the radical superoxide anion with a small contribution of the e−/h+ pair. It appears that the hydroxyl radical didn't contribute in this discoloration mechanism.
Journal of Hazardous Materials, 2015
In this work, a co-doped Bi-Zn-TiO2 photocatalist is synthesized by an original synthesis route o... more In this work, a co-doped Bi-Zn-TiO2 photocatalist is synthesized by an original synthesis route of layered double hydroxide followed by heat treatment at 670°C. After characterization the photocatalyst efficiency is estimated by the photo-discoloration of an anionic dye (indigo carmine) under visible light and compare to TiO2-P25 as reference material. In this new photocatalyst, anatase and ZnO wurtzite are the only identified crystalline phase, rutile and Bi2O3 being undetected. Moreover, the binding energy of Bi determined (XPS analysis) is different from the one of Bi in Bi2O3. Compared to TiO2-P25, the absorption is red shifted (UV-vis DRS) and the Bi-Zn-TiO2 photocatalyst showed sorption capacity toward indigo carmine higher than that TiO2-P25. The kinetics of the photo-discoloration is faster with Bi-Zn-TiO2 than with TiO2-P25. Indeed, a complete discoloration is obtained after 70min and 120min in the presence of Bi-Zn-TiO2 and TiO2-P25 respectively. The identification of the responsible species on photo-discoloration was carried out in the presence of different scavengers. The study showed that the first responsible is h(+) specie with a moderate contribution of superoxide anion radical and a minor contribution of the hydroxyl radical. The material showed high stability after five uses with the same rate of photo-discoloration.
DESALINATION AND WATER TREATMENT, 2023
BiOI/Bi 2 O 3 /MgO hetero-structured (B/B/M) was prepared by a hydrothermal method and then calci... more BiOI/Bi 2 O 3 /MgO hetero-structured (B/B/M) was prepared by a hydrothermal method and then calcined at different temperatures (200°C, 300°C, 400°C, and 550°C) for 1 h. The efficiency of photocatalyst was tested on the photo-discoloration of a cationic dye (Rhodamine B (RhB)) under visible light (500 W tungsten lamp (Tungsram Trademark) that emits more than 400 nm) and compared to Bi 2 O 3 , TiO 2-P25 and BiOI as reference photocatalysts. The prepared samples were characterized by X-ray diffraction, Brunauer-Emmett-Teller, UV-Visible diffuse reflectance spectroscopy and scanning electron microscopy. In this new photocatalysts, three structures have been identified BiOI, Bi 2 O 3 , and MgO before and after heat treatment. Indeed, the sample prepared and calcined at 400°C/1 h show a good crystallinity and display microspheres porous in the form of cauliflower-like. Furthermore, the photocatalytic test of B/B/M-400 has shown efficiency on the photodegradation of RhB. Indeed, a total discoloration of 10 mg/L of RhB was achieved at 110 min.
World Academy of Science, Engineering and Technology, International Journal of Environmental and Ecological Engineering, 2015
Applied Surface Science, 2020
It is reported that a dual-layer carbon film on SiC wafer is prepared using carbide-derived carbo... more It is reported that a dual-layer carbon film on SiC wafer is prepared using carbide-derived carbon (CDC) process with subsequent chemical vapor deposition (CVD). The dual-layer film includes a sub-layer of CDC and a top layer of CVD, which are prepared by chlorination of SiC and pyrolysis of CCl 4 at high temperature respectively. The CDC and CVD layers are mainly amorphous. And similar dispersion effects are observed in the Raman spectra, although the D-band position of the CVD layer shifts to higher wavenumber (~1354 cm −1) than that of the CDC layer (~1337 cm −1). Surface chemistry analysis suggests that the unstable chemical bonds, mainly C-Cl, as well as dangling bonds in the CDC layer play an important role in promoting the nucleation of CVD carbon. The surface morphology evolvement from SiC wafer to CDC layer and to dual-layer film is investigated by atomic force microscopy [AFM] and field emission scanning electronic microscopy [FESEM]. The nanoporous surface formed in the CDC process is favorable for capturing carbon species from the gas phase and can act as a "seedbed" for the nucleation and growth of CVD layer. The primary tribological study indicates that the dual-layer film shows great advantages in friction reduction and wear resistance with comparison to SiC and CDC layer, suggesting its potential in lubrication for SiC-based moving components.