mongi seffen - Academia.edu (original) (raw)
Papers by mongi seffen
Separation Science and Technology, Dec 12, 2013
ABSTRACT Kinetics sorption study was carried out with varying pH, concentration, and temperature ... more ABSTRACT Kinetics sorption study was carried out with varying pH, concentration, and temperature to determine the potential of Agave americana fiber for the removal of methylene blue. The thermodynamic properties (ΔG°, ΔH° and ΔS°) were determined. In order to investigate the sorption mechanisms, kinetic parameters were determined using the Lagergren, the pseudo-second order and the recently established fractal kinetic equations. The experimental kinetics data have been fitted with the non linear form of the new Brouers Sotolongo kinetic model. Fractal kinetic equation gives higher correlation coefficients, indicating that this model can be considered accurate for describing the sorption methylene blue kinetics.
Chemical Engineering & Technology, 2021
Environmental Science and Pollution Research, 2020
Water Science and Technology, 2018
The present study evaluates the phosphorus (P) adsorption by alkaline soil in fixed bed column mo... more The present study evaluates the phosphorus (P) adsorption by alkaline soil in fixed bed column mode operation. The effects of flow rate, bed height, and initial P concentration on breakthrough curves were evaluated. Data confirmed that both the breakthrough and exhaustion time increased in parallel with the rise in bed height and the decline in flow rate and initial P concentration. The adsorption capacity was observed to increase with decreasing flow rate and bed height and increasing initial concentration. Moreover, continuous adsorption experiments were conducted using three salts (NaCl, KCl and CaCl2) with the same concentration (0.01 M) to investigate the P adsorption behavior in saline conditions. The results showed that all three salts improve the P adsorption in the soil column. Consequently, the bed performance was significantly enhanced with salts addition. The maximum adsorption capacity of 13.47 mg g−1 for P, 16.13 mg g−1 for P-NaCl, 22.10 mg g−1 for P-KCl, 30.05 mg g−1 ...
Industrial Crops and Products, 2019
Environmental Science and Pollution Research, 2019
Environmental Science and Pollution Research, 2018
Environmental Science and Pollution Research, 2016
The main purpose of this work is to study the effect of a new process of accelerating which consi... more The main purpose of this work is to study the effect of a new process of accelerating which consist to couple the electrochemical process with the adsorption to remove an anionic dye, the indigo carmine. That is why, we investigated the effects of the new process of accelerating the adsorption process by using alternating current (AC) on the retention of an anionic dye, the indigo carmine. The adsorption capacity of dye (mg/g) was raised with the raise of current voltage in solution, temperature, and initial indigo carmine concentration and decreased with the increase of initial solution pH, current density, and mass of carbon. The results demonstrate that the removal efficiency of 97.0 % with the current voltage of 15 V is achieved at a current density of 0.014 A/cm, of pH 2 using zinc as electrodes and contact time of 210 min for adsorption in the presence of AC. Concerning the adsorption without AC, the results obtained showed that for an initial concentration equal to 20 mg/L, more than 95 % amount of adsorbed dye was retained after 405 min of contact in batch system. The comparison between adsorption in the presence and absence of an alternating current shows the importance of the alternating current in the acceleration of the adsorption method and improve the performances of FILTRASORB 200. For both cases, the adsorption mechanism follows the fractal kinetics BSf(n,α) model and the Brouers-Sotolongo isotherm model provides a good fit of the experimental data for both adsorption with and without alternating current.
Revue des sciences de l'eau, 2008
Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que nouvel adsorban... more Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que nouvel adsorbant biologique pour l’élimination du chrome hexavalent des solutions aqueuses artificiellement contaminées. Les expériences ont été effectuées en lots aussi bien pour les cinétiques que pour les isothermes d’adsorption. Les variables expérimentales étudiées sont le pH, la température, la quantité de biomasse et la concentration initiale de Cr(VI). Le maximum de biosorption a été observé pour un pH 2. La capacité de biosorption semble être optimisée par une augmentation de la température, de la quantité de biosorbant et de la concentration initiale. Les isothermes d’adsorption sont en accord avec les modèles de Redlich-Peterson et Langmuir. De plus, l’analyse thermodynamique a révélé que le présent processus d’adsorption est un phénomène favorable, endothermique et spontané.
Applied and Environmental Soil Science, 2013
Recent Patents on Chemical Engineering, 2010
ABSTRACT In the present paper, a review of the production methods of activated carbons from vario... more ABSTRACT In the present paper, a review of the production methods of activated carbons from various kinds of precursors and their industrial use is presented, based on recently developed patents. The main discussion is divided into two major parts: (i) the activated carbons fabrication industry starting from the choice of the precursor to the activation of the carbonaceous materials and (ii) their diverse applications. Dealing with the activated carbons precursors, recent patents pointed out the beneficial use of several bioresources, agro-industrial wastes, used tires and newspapers for example. In addition, inventors proposed different kinds of fabrication process, with respect to the field in which the activated carbon will be used including wastewater and air treatment, fuel purification and gold recovery. Besides, to enhance the overall economical benefit in using activated carbons, other researchers developed some innovative techniques to regenerate hose costly materials, for further utilization of the carbon itself or the recovery of the already sorbed precious compounds. Hence, this review article summarizes recent and important patents relating to the chemical engineering of activated carbons.
Journal of Hazardous Materials, 2007
Batch biosorption experiments were carried out for the removal of methylene blue, a basic dye, fr... more Batch biosorption experiments were carried out for the removal of methylene blue, a basic dye, from aqueous solution using raw Posidonia oceanica (L.) fibres, a marine lignocellulosic biomass. A series of assays were undertaken to assess the effect of the system variables, i.e. contact time, solution pH, biosorbent dosage and initial dye concentration. The results had showed that biosorption capacity was optimal using 6-9 solution pH range and by increasing the biosorbent concentration up to 1 g/L. The biosorption kinetics were analyzed using irreversible-first-order, reversible-first-order and pseudo-second-order and the sorption data were very well described by the pseudo-second-order model for the entire adsorption time with squared correlation coefficients equal to unity for all experimented initial dye concentrations. Besides, equilibrium data were very well represented by both Langmuir and Redlich-Peterson isotherm models followed by Freundlich, which confirm the monolayer coverage of methylene blue molecules onto P. oceanica fibres.
Journal of Environmental Engineering and Science, 2008
Les ægagropiles du végétal marin Posidonia oceanica (L.) ont été utilisées comme un adsorbant bio... more Les ægagropiles du végétal marin Posidonia oceanica (L.) ont été utilisées comme un adsorbant biologique renouvelable et bon marché pour l’élimination de colorant textile métallifère à partir de solutions aqueuses. Les expériences en batch ont été effectuées aussi bien pour les cinétiques que pour les isothermes d’adsorption. Les variables expérimentales étudiées étaient le pH, le temps de contact à différentes concentrations initiales et la quantité de fibres. La capacité d’adsorption s’est avérée maximale à un pH de 2. De plus, elle semble être optimisée par une augmentation de la concentration initiale de colorant et la quantité d’adsorbant jusqu’à 20 g/L. La modélisation des données expérimentales relatives aux cinétiques a montré que le modèle de pseudo-second ordre décrit d’une façon satisfaisante l’adsorption sur fibres brutes, suggérant ainsi une « chimiosorption ». De plus, les données à l'équilibre ont été modélisées en utilisant les équations de Langmuir, Freundlich, ...
Journal of Chemical Technology & Biotechnology, 2007
The Canadian Journal of Chemical Engineering, 2008
Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que matrice adsorba... more Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que matrice adsorbante d'un colorant textile réactif (Cibacron Red) pour son élimination des solutions aqueuses. Des essais en batch ont été réalisés pour déterminer les cinétiques et les isothermes d'adsorption. Les variables expérimentales étudiées sont la taille des particules, la quantité de fibres, la température, le pH et les prétraitements chimiques. L'état d'équilibre est atteint au bout de 48 h. La capacité de biosorption semble être maximisée par une augmentation de la quantité de support. La température a également un effet stimulant sur la biosorption du colorant. Le maximum de biosorption a été observé à un pH de 5,5. Le prétraitement préalable des fibres à l'acide phosphorique et nitrique permet d'augmenter considérablement leur capacité d'adsorption. La modélisation des données expérimentales a montré que les modèles du pseudo‐second ordre et de Freundlich décrive...
Separation Science and Technology, Dec 12, 2013
ABSTRACT Kinetics sorption study was carried out with varying pH, concentration, and temperature ... more ABSTRACT Kinetics sorption study was carried out with varying pH, concentration, and temperature to determine the potential of Agave americana fiber for the removal of methylene blue. The thermodynamic properties (ΔG°, ΔH° and ΔS°) were determined. In order to investigate the sorption mechanisms, kinetic parameters were determined using the Lagergren, the pseudo-second order and the recently established fractal kinetic equations. The experimental kinetics data have been fitted with the non linear form of the new Brouers Sotolongo kinetic model. Fractal kinetic equation gives higher correlation coefficients, indicating that this model can be considered accurate for describing the sorption methylene blue kinetics.
Chemical Engineering & Technology, 2021
Environmental Science and Pollution Research, 2020
Water Science and Technology, 2018
The present study evaluates the phosphorus (P) adsorption by alkaline soil in fixed bed column mo... more The present study evaluates the phosphorus (P) adsorption by alkaline soil in fixed bed column mode operation. The effects of flow rate, bed height, and initial P concentration on breakthrough curves were evaluated. Data confirmed that both the breakthrough and exhaustion time increased in parallel with the rise in bed height and the decline in flow rate and initial P concentration. The adsorption capacity was observed to increase with decreasing flow rate and bed height and increasing initial concentration. Moreover, continuous adsorption experiments were conducted using three salts (NaCl, KCl and CaCl2) with the same concentration (0.01 M) to investigate the P adsorption behavior in saline conditions. The results showed that all three salts improve the P adsorption in the soil column. Consequently, the bed performance was significantly enhanced with salts addition. The maximum adsorption capacity of 13.47 mg g−1 for P, 16.13 mg g−1 for P-NaCl, 22.10 mg g−1 for P-KCl, 30.05 mg g−1 ...
Industrial Crops and Products, 2019
Environmental Science and Pollution Research, 2019
Environmental Science and Pollution Research, 2018
Environmental Science and Pollution Research, 2016
The main purpose of this work is to study the effect of a new process of accelerating which consi... more The main purpose of this work is to study the effect of a new process of accelerating which consist to couple the electrochemical process with the adsorption to remove an anionic dye, the indigo carmine. That is why, we investigated the effects of the new process of accelerating the adsorption process by using alternating current (AC) on the retention of an anionic dye, the indigo carmine. The adsorption capacity of dye (mg/g) was raised with the raise of current voltage in solution, temperature, and initial indigo carmine concentration and decreased with the increase of initial solution pH, current density, and mass of carbon. The results demonstrate that the removal efficiency of 97.0 % with the current voltage of 15 V is achieved at a current density of 0.014 A/cm, of pH 2 using zinc as electrodes and contact time of 210 min for adsorption in the presence of AC. Concerning the adsorption without AC, the results obtained showed that for an initial concentration equal to 20 mg/L, more than 95 % amount of adsorbed dye was retained after 405 min of contact in batch system. The comparison between adsorption in the presence and absence of an alternating current shows the importance of the alternating current in the acceleration of the adsorption method and improve the performances of FILTRASORB 200. For both cases, the adsorption mechanism follows the fractal kinetics BSf(n,α) model and the Brouers-Sotolongo isotherm model provides a good fit of the experimental data for both adsorption with and without alternating current.
Revue des sciences de l'eau, 2008
Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que nouvel adsorban... more Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que nouvel adsorbant biologique pour l’élimination du chrome hexavalent des solutions aqueuses artificiellement contaminées. Les expériences ont été effectuées en lots aussi bien pour les cinétiques que pour les isothermes d’adsorption. Les variables expérimentales étudiées sont le pH, la température, la quantité de biomasse et la concentration initiale de Cr(VI). Le maximum de biosorption a été observé pour un pH 2. La capacité de biosorption semble être optimisée par une augmentation de la température, de la quantité de biosorbant et de la concentration initiale. Les isothermes d’adsorption sont en accord avec les modèles de Redlich-Peterson et Langmuir. De plus, l’analyse thermodynamique a révélé que le présent processus d’adsorption est un phénomène favorable, endothermique et spontané.
Applied and Environmental Soil Science, 2013
Recent Patents on Chemical Engineering, 2010
ABSTRACT In the present paper, a review of the production methods of activated carbons from vario... more ABSTRACT In the present paper, a review of the production methods of activated carbons from various kinds of precursors and their industrial use is presented, based on recently developed patents. The main discussion is divided into two major parts: (i) the activated carbons fabrication industry starting from the choice of the precursor to the activation of the carbonaceous materials and (ii) their diverse applications. Dealing with the activated carbons precursors, recent patents pointed out the beneficial use of several bioresources, agro-industrial wastes, used tires and newspapers for example. In addition, inventors proposed different kinds of fabrication process, with respect to the field in which the activated carbon will be used including wastewater and air treatment, fuel purification and gold recovery. Besides, to enhance the overall economical benefit in using activated carbons, other researchers developed some innovative techniques to regenerate hose costly materials, for further utilization of the carbon itself or the recovery of the already sorbed precious compounds. Hence, this review article summarizes recent and important patents relating to the chemical engineering of activated carbons.
Journal of Hazardous Materials, 2007
Batch biosorption experiments were carried out for the removal of methylene blue, a basic dye, fr... more Batch biosorption experiments were carried out for the removal of methylene blue, a basic dye, from aqueous solution using raw Posidonia oceanica (L.) fibres, a marine lignocellulosic biomass. A series of assays were undertaken to assess the effect of the system variables, i.e. contact time, solution pH, biosorbent dosage and initial dye concentration. The results had showed that biosorption capacity was optimal using 6-9 solution pH range and by increasing the biosorbent concentration up to 1 g/L. The biosorption kinetics were analyzed using irreversible-first-order, reversible-first-order and pseudo-second-order and the sorption data were very well described by the pseudo-second-order model for the entire adsorption time with squared correlation coefficients equal to unity for all experimented initial dye concentrations. Besides, equilibrium data were very well represented by both Langmuir and Redlich-Peterson isotherm models followed by Freundlich, which confirm the monolayer coverage of methylene blue molecules onto P. oceanica fibres.
Journal of Environmental Engineering and Science, 2008
Les ægagropiles du végétal marin Posidonia oceanica (L.) ont été utilisées comme un adsorbant bio... more Les ægagropiles du végétal marin Posidonia oceanica (L.) ont été utilisées comme un adsorbant biologique renouvelable et bon marché pour l’élimination de colorant textile métallifère à partir de solutions aqueuses. Les expériences en batch ont été effectuées aussi bien pour les cinétiques que pour les isothermes d’adsorption. Les variables expérimentales étudiées étaient le pH, le temps de contact à différentes concentrations initiales et la quantité de fibres. La capacité d’adsorption s’est avérée maximale à un pH de 2. De plus, elle semble être optimisée par une augmentation de la concentration initiale de colorant et la quantité d’adsorbant jusqu’à 20 g/L. La modélisation des données expérimentales relatives aux cinétiques a montré que le modèle de pseudo-second ordre décrit d’une façon satisfaisante l’adsorption sur fibres brutes, suggérant ainsi une « chimiosorption ». De plus, les données à l'équilibre ont été modélisées en utilisant les équations de Langmuir, Freundlich, ...
Journal of Chemical Technology & Biotechnology, 2007
The Canadian Journal of Chemical Engineering, 2008
Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que matrice adsorba... more Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que matrice adsorbante d'un colorant textile réactif (Cibacron Red) pour son élimination des solutions aqueuses. Des essais en batch ont été réalisés pour déterminer les cinétiques et les isothermes d'adsorption. Les variables expérimentales étudiées sont la taille des particules, la quantité de fibres, la température, le pH et les prétraitements chimiques. L'état d'équilibre est atteint au bout de 48 h. La capacité de biosorption semble être maximisée par une augmentation de la quantité de support. La température a également un effet stimulant sur la biosorption du colorant. Le maximum de biosorption a été observé à un pH de 5,5. Le prétraitement préalable des fibres à l'acide phosphorique et nitrique permet d'augmenter considérablement leur capacité d'adsorption. La modélisation des données expérimentales a montré que les modèles du pseudo‐second ordre et de Freundlich décrive...