Brahim Guezzen - Academia.edu (original) (raw)
Papers by Brahim Guezzen
This work concerns with the experimental study of the adsorption of the Ni(II) on bentonite. The ... more This work concerns with the experimental study of the adsorption of the Ni(II) on bentonite. The effects of various parameters such as contact time, stirring rate, initial concentration of Ni(II), masse of clay, initial pH of aqueous solution and temperature on the adsorption yield, were carried out. The study of the effect of the ionic strength on the yield of adsorption was examined by the identification and the quantification of the present chemical species in the aqueous phase containing the metallic ion Ni(II). The adsorbed species were investigated by a calculation program using CHEAQS V. L20.1 in order to determine the relation between the percentages of the adsorbed species and the adsorption yield. The optimization process was carried out using 2<sup>3</sup> factorial designs. The individual and combined effects of three process parameters, i.e. initial Ni(II) concentration in aqueous solution (2.10<sup>−3</sup> and 5.10<sup>−3</sup> mol/...
In the present work, emulsion liquid membrane (ELM) technique was applied for the extraction of c... more In the present work, emulsion liquid membrane (ELM) technique was applied for the extraction of cadmium(II) present in aqueous samples. Aliquat 336 (Chloride tri-N-octylmethylammonium) was used as carrier to extract cadmium(II). The main objective of this work is to investigate the influence of various parameters affected the ELM formation and its stability and testing the performance of the prepared ELM on removal of cadmium by using synthetic solution with different concentrations. Experiments were conducted to optimize pH of the feed solution and it was found that cadmium(II) can be extracted at pH 6.5. The influence of the carrier concentration and treat ratio on the extraction process was investigated. The obtained results showed that the optimal values are respectively 3% (Aliquat 336) and a ratio (feed: emulsion) equal to 1:1.
An organoclay (HDTMA-B) was prepared from sodium bentonite (Na-B). The starting material was modi... more An organoclay (HDTMA-B) was prepared from sodium bentonite (Na-B). The starting material was modified using the hexadecyltrimethylammonium ion (HDTMA<sup>+</sup>) in the amounts corresponding to 100 % of the CEC value. Batch experiments were carried out in order to model and optimize the sorption of Congo red dye from aqueous solution. The pseudo-first order and pseudo-second order kinetic models have been developed to predict the rate constant and the sorption capacity at equilibrium with the effect of temperature, the solid/solution ratio and the initial dye concentration. The equilibrium time was reached within 60 min. At room temperature (20 °C), optimum dye sorption of 49.4 mg/g (98.9%) was achieved at pH 6.6, sorbent dosage of 1g/L and initial dye concentration of 50 mg/L, using surfactant modified bentonite. The optimization of adsorption parameters mentioned above on dye removal was carried out using Box-Behnken design. The sorption parameters were analyzed stati...
The present work focused on the preparation of hybrid-bentonite adsorbents by treating sodium ben... more The present work focused on the preparation of hybrid-bentonite adsorbents by treating sodium bentonite (Na-B) with different amounts of hexadecyltrimethylammonium bromide (HDTMA+ Br-), corresponding to 50, 100 and 200% the value of the cation exchange capacity (CEC). The samples prepared, namely 50HDTMA-B, 100HDTMA and 200HDTMA-B, were characterized by different techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA ). The removal efficiency of two anionic dyes, namely. Congo Red (CR) and Indigo Carmine (IC), from aqueous solutions, was studied as a function of the amount of HDTMA, contact time, hybrid adsorbent and initial dye concentration. In addition, a kinetic study was conducted to fit the experimental data in order to compare the adsorption rate constants and the equilibrium sorption capacities of anionic dyes on the prepared materials. The results obtained indicated that the adsorption kinetics of cla...
Research on Chemical Intermediates, 2020
A range of Cu-LDHs has been synthesized by co-precipitation using metal nitrate precursors and so... more A range of Cu-LDHs has been synthesized by co-precipitation using metal nitrate precursors and sodium carbonate under varying molar ratios Cu/Al (Cu 0.05-Al 0.15 , Cu 0.10-Al 0.10 , Cu 0.14-Al 0.06 , and Cu 0.15-Al 0.05). The uncalcined and calcined Cu-LDHs were characterized by powder X-ray diffraction and N 2 adsorption-desorption. The uncalcined solids showed clear hydrotalcite-like crystalline phases having a particle measurement between 5 and 16 nm. The best structure is attributed to the sample Cu 0.05-Al 0.15-LDHs. The particular surface areas are ranging between 40 and 92 m 2 /g, while the calcined samples showed the formation of Cu and Mg oxides. The antibacterial activity of Cu-LDHs with various molar ratios Cu/Al and their calcined phases were estimated towards multiple types of bacteria (Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and Bacillus Subtilis). The Cu 0.10-Al 0.10-LDHs sample shows high activity against all types of bacteria either for calcined or uncalcined materials. The obtained results of the application of Cu-LDHs antibacterial inhibitors seem to be quite promising material in the antibacterial fields.
Silicon, 2020
This work deals with the use for the first time of waste spent glass as a new source of silicon a... more This work deals with the use for the first time of waste spent glass as a new source of silicon and aluminum in the synthesis of highly ordered MCM-41 nanomaterials and also treats the method (namely direct and indirect) of its activation by copper under different mass ratios Si/Cu 60; 80 and 100. The evaluation of the activation method efficiency is tested against Gram-negative (E. coli) and Gram-positive (S. aureus and Bacillus cunis). The ordered MCM-41 nanomaterials were prepared by hydrothermal synthesis using the waste spent glass as silicon and aluminum sources. The silicon and aluminum needed for the synthesis of MCM-41 are extracted from waste spent glass by the alkaline fusion process. The copper is added to the MCM by two mentioned methods separately to obtain Cu-MCM-41. The resulting MCM were characterized by X-ray fluorescence (XRF), Inductively Coupled Plasma Optical Emission spectroscopy (ICP-OES), X-ray diffraction (XRD), Nitrogen adsorption-desorption, and Fourier transformed Infra-red spectroscopy (FTIR). Evaluation data revealed that the ordered mesoporous Cu-MCM-41 nanomaterials by both methods under different mass ratios Si/Cu are obtained. The high crystalline order is attributed to the mass ratio Si/Cu 100 for both methods. It is also noted that the specific surface areas of all mass ratios in both methods are up to 1000 m 2 g −1. No relationship is found between surface area and substitution method or metal content. Indeed, the efficiency of copper incorporation method of Cu-MCM-41 synthesized under molar ratio (Si/C = 100) in their two different states calcined and un-calcined are applied as antibacterial inhibitors against Gram-negative (E. coli) and Gram-positive (S. aureus and Bacillus cunis). The results obtained by the application of Cu-MCM-41 materials as antibacterial inhibitors appear to be very promising. However, the indirect method shows a slight improvement in antibacterial inhibition compared to the direct method.
Canadian Journal of Chemistry, 2020
Kinetic study was applied for sodium bentonite (Na-B) and hexadecylpyridinium bentonite (HDP-B) u... more Kinetic study was applied for sodium bentonite (Na-B) and hexadecylpyridinium bentonite (HDP-B) under different amounts, namely 50% (50HDP-B), 100% (100HDP-B), and 200% (200HDP-B) with respect to cation exchange capacity (CEC). Pseudo first-order and pseudo second-order kinetic models were performed to optimize the sorption of Congo red (CR) dye from aqueous solution. The experimental data fit the pseudo second order kinetic model well. The sorption capacity (qe) of CR dye by the organo-bentonites at equilibrium was 36.0 mg g−1 (72.1%) for 50HDP-B, 48.05 mg g−1 (96.1%) for 100HDP-B, and 49.2 mg g−1 (98.4%) for 200HDP-B. These results were considerably higher than that found by Na-B. Response surface methodology with three-variable, three-level Box–Behnken design was applied for 100HDP-B to describe the removal of CR dye. The effects of three variables, namely temperature, adsorbent dosage, and initial dye concentration, were studied. Predicted values of adsorption efficiency were fo...
Journal of Analytical & Bioanalytical Techniques, 2016
In this work, a novel room temperature ionic liquids 1-butyl-imidazolium di(2-ethylhexyl) phospha... more In this work, a novel room temperature ionic liquids 1-butyl-imidazolium di(2-ethylhexyl) phosphate [BIm + ] [D2EHP-] and 1-methyl-imidazolium di(2-ethylhexyl) phosphate [MIm + ][D2EHP-] were synthesized and tested as extractants in the batch removal of mercury (II) from aqueous solution. The influence of contact time, aqueous to organic phase's volume ratio, initial concentration of Hg (II), IL concentration, pH levels, ionic strength, and temperature was evaluated. The extraction equilibrium was established in 30 min for [MIm + ][D2EHP-] and in 15 min for [BIm + ][D2EHP-]. The maximum mercury extraction was obtained at pH 5.81. For the extraction of mercury, [([MIm + ] [D2EHP-]) 5 (HgCl 2)] org , [([MIm + ][D2EHP-]) 5 (HgClOH)] org , [([BIm + ][D2EHP-]) 3/2 (HgCl 2)] org and [([BIm + ][D2EHP-]) 3/2 (HgClOH)] org species were formed. Regarding the ionic strength for [MIm + ][D2EHP-], the results show a significant improvement of the mercury extraction yield (100%) upon the addition of sodium acetate to the aqueous phase in a Na + /Hg 2+ mass ratio ranging from 0.1 to 2.0. The relationship between the percentages of the extracted species and the extraction yield was established by calculations using CHEAQS V. L20.1 software. The results revealed a decrease in the extraction yield of Hg (II) with decreasing proportions of HgCl 2aq from 65.15 to 40.31% and of HgClOH aq from 31.31 to 0.1%, when NaCl was added. The very important optimal sorption capacities for ([BIm + ][D2EHP-]) and ([MIm + ][D2EHP]) were 58.39 mg/g and 93.23 mg/g respectively. With a longer alkyl chain on the imidazolinic ring, the decreasing of extraction yield was observed.
American Journal of Analytical Chemistry, 2015
The solvent extraction of cadmium(II) from nitrate medium was studied. The using extractants were... more The solvent extraction of cadmium(II) from nitrate medium was studied. The using extractants were quaternary ammonium-based room temperature ionic liquid Aliquat 336 in either the chloride [(C8H17)3 CH3N + •Cl − ], thiocyanate [(C8H17)3CH3N + •SCN − ] and hydrogenophosphate () 8 17 3 2 4 3 C H CH N H PO + − 2 4 Cd SCN − species with the addition of KSCN. More the hydrophobic character of the extractant is high, more the extraction is better. The metal ion was stripped out satisfactorily using nitric acid as stripping agent, in one step.
International Journal of Chemistry, 2012
The extraction of Zinc (II) in acetate medium with di (2-ethylhexyl) phosphoric acid (D2EHPA) in ... more The extraction of Zinc (II) in acetate medium with di (2-ethylhexyl) phosphoric acid (D2EHPA) in chloroform diluent was investigated under different experimental conditions, in order to have a better understanding of the extraction mechanism. The extraction yield was found to depend on the concentrations of Zinc (II) and D2EHPA, and the equilibrium pH. The effects of acetic acid and the salting-out agent were also studied. The nature of the extracted species was investigated by the slope analysis method. Graphs of log D vs. log [D2EHPA] and log D vs. pH were plotted for Zn (II), and the species extracted into the organic phase was found to have the composition (ZnCH 3 COO)R.HR. The best performance was reached (80%) with zinc concentrations lower than 5 mM in a neutral medium. The extraction yield of metals decreased as the acetic acid concentration increased with any given extractant concentration. The addition of sodium acetate to the aqueous phase strongly increased the zinc extraction yield (99.5%). A synergistic effect was observed by the addition of tributhylphosphate (TBP) with the organic phase.
This work concerns with the experimental study of the adsorption of the Ni(II) on bentonite. The ... more This work concerns with the experimental study of the adsorption of the Ni(II) on bentonite. The effects of various parameters such as contact time, stirring rate, initial concentration of Ni(II), masse of clay, initial pH of aqueous solution and temperature on the adsorption yield, were carried out. The study of the effect of the ionic strength on the yield of adsorption was examined by the identification and the quantification of the present chemical species in the aqueous phase containing the metallic ion Ni(II). The adsorbed species were investigated by a calculation program using CHEAQS V. L20.1 in order to determine the relation between the percentages of the adsorbed species and the adsorption yield. The optimization process was carried out using 2<sup>3</sup> factorial designs. The individual and combined effects of three process parameters, i.e. initial Ni(II) concentration in aqueous solution (2.10<sup>−3</sup> and 5.10<sup>−3</sup> mol/...
In the present work, emulsion liquid membrane (ELM) technique was applied for the extraction of c... more In the present work, emulsion liquid membrane (ELM) technique was applied for the extraction of cadmium(II) present in aqueous samples. Aliquat 336 (Chloride tri-N-octylmethylammonium) was used as carrier to extract cadmium(II). The main objective of this work is to investigate the influence of various parameters affected the ELM formation and its stability and testing the performance of the prepared ELM on removal of cadmium by using synthetic solution with different concentrations. Experiments were conducted to optimize pH of the feed solution and it was found that cadmium(II) can be extracted at pH 6.5. The influence of the carrier concentration and treat ratio on the extraction process was investigated. The obtained results showed that the optimal values are respectively 3% (Aliquat 336) and a ratio (feed: emulsion) equal to 1:1.
An organoclay (HDTMA-B) was prepared from sodium bentonite (Na-B). The starting material was modi... more An organoclay (HDTMA-B) was prepared from sodium bentonite (Na-B). The starting material was modified using the hexadecyltrimethylammonium ion (HDTMA<sup>+</sup>) in the amounts corresponding to 100 % of the CEC value. Batch experiments were carried out in order to model and optimize the sorption of Congo red dye from aqueous solution. The pseudo-first order and pseudo-second order kinetic models have been developed to predict the rate constant and the sorption capacity at equilibrium with the effect of temperature, the solid/solution ratio and the initial dye concentration. The equilibrium time was reached within 60 min. At room temperature (20 °C), optimum dye sorption of 49.4 mg/g (98.9%) was achieved at pH 6.6, sorbent dosage of 1g/L and initial dye concentration of 50 mg/L, using surfactant modified bentonite. The optimization of adsorption parameters mentioned above on dye removal was carried out using Box-Behnken design. The sorption parameters were analyzed stati...
The present work focused on the preparation of hybrid-bentonite adsorbents by treating sodium ben... more The present work focused on the preparation of hybrid-bentonite adsorbents by treating sodium bentonite (Na-B) with different amounts of hexadecyltrimethylammonium bromide (HDTMA+ Br-), corresponding to 50, 100 and 200% the value of the cation exchange capacity (CEC). The samples prepared, namely 50HDTMA-B, 100HDTMA and 200HDTMA-B, were characterized by different techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA ). The removal efficiency of two anionic dyes, namely. Congo Red (CR) and Indigo Carmine (IC), from aqueous solutions, was studied as a function of the amount of HDTMA, contact time, hybrid adsorbent and initial dye concentration. In addition, a kinetic study was conducted to fit the experimental data in order to compare the adsorption rate constants and the equilibrium sorption capacities of anionic dyes on the prepared materials. The results obtained indicated that the adsorption kinetics of cla...
Research on Chemical Intermediates, 2020
A range of Cu-LDHs has been synthesized by co-precipitation using metal nitrate precursors and so... more A range of Cu-LDHs has been synthesized by co-precipitation using metal nitrate precursors and sodium carbonate under varying molar ratios Cu/Al (Cu 0.05-Al 0.15 , Cu 0.10-Al 0.10 , Cu 0.14-Al 0.06 , and Cu 0.15-Al 0.05). The uncalcined and calcined Cu-LDHs were characterized by powder X-ray diffraction and N 2 adsorption-desorption. The uncalcined solids showed clear hydrotalcite-like crystalline phases having a particle measurement between 5 and 16 nm. The best structure is attributed to the sample Cu 0.05-Al 0.15-LDHs. The particular surface areas are ranging between 40 and 92 m 2 /g, while the calcined samples showed the formation of Cu and Mg oxides. The antibacterial activity of Cu-LDHs with various molar ratios Cu/Al and their calcined phases were estimated towards multiple types of bacteria (Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and Bacillus Subtilis). The Cu 0.10-Al 0.10-LDHs sample shows high activity against all types of bacteria either for calcined or uncalcined materials. The obtained results of the application of Cu-LDHs antibacterial inhibitors seem to be quite promising material in the antibacterial fields.
Silicon, 2020
This work deals with the use for the first time of waste spent glass as a new source of silicon a... more This work deals with the use for the first time of waste spent glass as a new source of silicon and aluminum in the synthesis of highly ordered MCM-41 nanomaterials and also treats the method (namely direct and indirect) of its activation by copper under different mass ratios Si/Cu 60; 80 and 100. The evaluation of the activation method efficiency is tested against Gram-negative (E. coli) and Gram-positive (S. aureus and Bacillus cunis). The ordered MCM-41 nanomaterials were prepared by hydrothermal synthesis using the waste spent glass as silicon and aluminum sources. The silicon and aluminum needed for the synthesis of MCM-41 are extracted from waste spent glass by the alkaline fusion process. The copper is added to the MCM by two mentioned methods separately to obtain Cu-MCM-41. The resulting MCM were characterized by X-ray fluorescence (XRF), Inductively Coupled Plasma Optical Emission spectroscopy (ICP-OES), X-ray diffraction (XRD), Nitrogen adsorption-desorption, and Fourier transformed Infra-red spectroscopy (FTIR). Evaluation data revealed that the ordered mesoporous Cu-MCM-41 nanomaterials by both methods under different mass ratios Si/Cu are obtained. The high crystalline order is attributed to the mass ratio Si/Cu 100 for both methods. It is also noted that the specific surface areas of all mass ratios in both methods are up to 1000 m 2 g −1. No relationship is found between surface area and substitution method or metal content. Indeed, the efficiency of copper incorporation method of Cu-MCM-41 synthesized under molar ratio (Si/C = 100) in their two different states calcined and un-calcined are applied as antibacterial inhibitors against Gram-negative (E. coli) and Gram-positive (S. aureus and Bacillus cunis). The results obtained by the application of Cu-MCM-41 materials as antibacterial inhibitors appear to be very promising. However, the indirect method shows a slight improvement in antibacterial inhibition compared to the direct method.
Canadian Journal of Chemistry, 2020
Kinetic study was applied for sodium bentonite (Na-B) and hexadecylpyridinium bentonite (HDP-B) u... more Kinetic study was applied for sodium bentonite (Na-B) and hexadecylpyridinium bentonite (HDP-B) under different amounts, namely 50% (50HDP-B), 100% (100HDP-B), and 200% (200HDP-B) with respect to cation exchange capacity (CEC). Pseudo first-order and pseudo second-order kinetic models were performed to optimize the sorption of Congo red (CR) dye from aqueous solution. The experimental data fit the pseudo second order kinetic model well. The sorption capacity (qe) of CR dye by the organo-bentonites at equilibrium was 36.0 mg g−1 (72.1%) for 50HDP-B, 48.05 mg g−1 (96.1%) for 100HDP-B, and 49.2 mg g−1 (98.4%) for 200HDP-B. These results were considerably higher than that found by Na-B. Response surface methodology with three-variable, three-level Box–Behnken design was applied for 100HDP-B to describe the removal of CR dye. The effects of three variables, namely temperature, adsorbent dosage, and initial dye concentration, were studied. Predicted values of adsorption efficiency were fo...
Journal of Analytical & Bioanalytical Techniques, 2016
In this work, a novel room temperature ionic liquids 1-butyl-imidazolium di(2-ethylhexyl) phospha... more In this work, a novel room temperature ionic liquids 1-butyl-imidazolium di(2-ethylhexyl) phosphate [BIm + ] [D2EHP-] and 1-methyl-imidazolium di(2-ethylhexyl) phosphate [MIm + ][D2EHP-] were synthesized and tested as extractants in the batch removal of mercury (II) from aqueous solution. The influence of contact time, aqueous to organic phase's volume ratio, initial concentration of Hg (II), IL concentration, pH levels, ionic strength, and temperature was evaluated. The extraction equilibrium was established in 30 min for [MIm + ][D2EHP-] and in 15 min for [BIm + ][D2EHP-]. The maximum mercury extraction was obtained at pH 5.81. For the extraction of mercury, [([MIm + ] [D2EHP-]) 5 (HgCl 2)] org , [([MIm + ][D2EHP-]) 5 (HgClOH)] org , [([BIm + ][D2EHP-]) 3/2 (HgCl 2)] org and [([BIm + ][D2EHP-]) 3/2 (HgClOH)] org species were formed. Regarding the ionic strength for [MIm + ][D2EHP-], the results show a significant improvement of the mercury extraction yield (100%) upon the addition of sodium acetate to the aqueous phase in a Na + /Hg 2+ mass ratio ranging from 0.1 to 2.0. The relationship between the percentages of the extracted species and the extraction yield was established by calculations using CHEAQS V. L20.1 software. The results revealed a decrease in the extraction yield of Hg (II) with decreasing proportions of HgCl 2aq from 65.15 to 40.31% and of HgClOH aq from 31.31 to 0.1%, when NaCl was added. The very important optimal sorption capacities for ([BIm + ][D2EHP-]) and ([MIm + ][D2EHP]) were 58.39 mg/g and 93.23 mg/g respectively. With a longer alkyl chain on the imidazolinic ring, the decreasing of extraction yield was observed.
American Journal of Analytical Chemistry, 2015
The solvent extraction of cadmium(II) from nitrate medium was studied. The using extractants were... more The solvent extraction of cadmium(II) from nitrate medium was studied. The using extractants were quaternary ammonium-based room temperature ionic liquid Aliquat 336 in either the chloride [(C8H17)3 CH3N + •Cl − ], thiocyanate [(C8H17)3CH3N + •SCN − ] and hydrogenophosphate () 8 17 3 2 4 3 C H CH N H PO + − 2 4 Cd SCN − species with the addition of KSCN. More the hydrophobic character of the extractant is high, more the extraction is better. The metal ion was stripped out satisfactorily using nitric acid as stripping agent, in one step.
International Journal of Chemistry, 2012
The extraction of Zinc (II) in acetate medium with di (2-ethylhexyl) phosphoric acid (D2EHPA) in ... more The extraction of Zinc (II) in acetate medium with di (2-ethylhexyl) phosphoric acid (D2EHPA) in chloroform diluent was investigated under different experimental conditions, in order to have a better understanding of the extraction mechanism. The extraction yield was found to depend on the concentrations of Zinc (II) and D2EHPA, and the equilibrium pH. The effects of acetic acid and the salting-out agent were also studied. The nature of the extracted species was investigated by the slope analysis method. Graphs of log D vs. log [D2EHPA] and log D vs. pH were plotted for Zn (II), and the species extracted into the organic phase was found to have the composition (ZnCH 3 COO)R.HR. The best performance was reached (80%) with zinc concentrations lower than 5 mM in a neutral medium. The extraction yield of metals decreased as the acetic acid concentration increased with any given extractant concentration. The addition of sodium acetate to the aqueous phase strongly increased the zinc extraction yield (99.5%). A synergistic effect was observed by the addition of tributhylphosphate (TBP) with the organic phase.