Water pollution is an alarming problem in developing countries. Dried algae can be considered as ... more Water pollution is an alarming problem in developing countries. Dried algae can be considered as potential and suitable bio-sorbents due to their fast and easy growth and high availability. The special surface properties of these algae allow them to adsorb different types of organic and inorganic pollutants from solutions. In this context, the removal of anionic acid blue 113 dye (AB113) from aqueous solutions by dried Corallina officinalis alga as low-cost bio-sorbent was chosen as a case study of a typical remediation process of water contaminants. The effect of various environmental and physicochemical parameters has been studied. The results show that the equilibrium adsorption was established within 120 min. The sorption phenomenon was investigated by determining the process kinetics at different concentrations and the adsorption isotherms at different temperatures. The kinetics results showed that the pseudo second-order kinetics model generates the best agreement with the experimental data. The modeling results showed that linear Langmuir and Freundlich models appear to fit the adsorption data better than Temkin model for the adsorption of AB113 onto dried C. officinalis alga. It can be concluded that C. Officinalis alga can be successfully used as adsorbent.
In this study, the modelling and optimization studies of the carcinogenic acid dye sorption from ... more In this study, the modelling and optimization studies of the carcinogenic acid dye sorption from aqueous solutions were carried out using the Factor Design Methodology. This methodology provides a predictive model of the response in the range of variables studied and determines the optimum conditions for the best performance. The sorption of acid dye AB113 on Moroccan prickly pear cactus peel (MPPCP) was chosen as a case study of a typical removal process. Minitab17 software was used to study the effects of adsorption parameters, including initial dye concentration, solution pH, adsorbent dose, contact time, and temperature. Analysis of variance (ANOVA) was used to evaluate the experimental results obtained. The studied parameters at two levels (-1 and +1) were coded as X1, X2, X3, X4 and X5, consecutively. The optimum conditions obtained for the adsorption of AB113 dye were: 1 g for the mass of MPPCP, 6 for the initial solution pH, 180 min for the contact time and 20 mg/L for the initial dye concentration. The results show that the model is well adapted to the experimental data, indicating the suitability of the model and the success of the factorial design methodology in optimizing the adsorption conditions.
This study aims to prove sand dunes’ color difference across Ziz riversides at Yerdi and then to ... more This study aims to prove sand dunes’ color difference across Ziz riversides at Yerdi and then to investigate sand’s origin and transport pathways. We have opted for remote sensing and Geographic Information System tools as a methodology, in addition to laboratory analyses, that included mineralogy, grain size, and shape investigation of samples collected from studied dunes. The results reveal the following: (i) variation in grain size and shape of the studied sand. A high concentration of quartz and a low amount of carbonates and iron oxide were recorded in the studied dunes. Heavy mineral analyses have shown a similar mineralogical concentration in both samples, yet sand in the left side appears to be richer in hematite and goethite than the right one. (ii) Band ratios 6:4 and 5:7 of Landsat TM allowed the mineralogical distinction of mafic minerals, carbonates, and quartz, while Landsat 3:1 band ratio and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) 2:1 band ratio were the most suitable for iron oxide distinction. The results confirm the dominance of quartz in both sides. However, iron oxide III (Fe3+) concentration is much important in the left side, which explains the difference in sand color. (iii) The studied dunes are potentially supplied from Quaternary, Cretaceous, and Paleozoic formations. The abundance of ferruginous conglomerate among potential formations supplying dunes and the abundance of hematite and goethite in sand from the left bank more than the right explain the red color marking these dunes. While, dunes’ morphodynamic explains the pal color observed in dunes located in the right bank.
This article deals with the valorization of local natural materials of vegetable origin, which ar... more This article deals with the valorization of local natural materials of vegetable origin, which are less expensive and non-toxic through their use in water treatment. We have shown that the acid solution (HCl, 0.5 N) pretreatment of the Carpobrotus edulis plant increases its adsorbent potential towards Methylene Blue and reduces the levels of soluble organic matter that can be released into the water. The bio-adsorbents were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Elemental Analysis (EDX), Zero Point of Charge (PHz), Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD5). The acid treatment allows a reduction in soluble organic matter characterized by a decrease in BOD5 and COD of 91.9% and 88.3% respectively. For the initial concentration of 100 mg/L of MB, the biomaterial obtained after acid treatment (HMCE) has an equilibrium adsorption capacity of 19.61 mg/g compared to 9.91 mg/g for the native plant (NCE). Acid treatment also reduces the amount of adsorbent required to achieve a maximum rate of adsorption. pH, temperature and ionic strength do not have a major influence on the adsorption of Methylene Blue on the biomaterials studied. This adsorption follows the pseudo-second order kinetic model and is represented by the Langmuir and Freundlich isotherms. It is a spontaneous and endothermic process.
The MgAl-LDH adsorbent (2:1) was developed by the urea method and used as an adsorbent for the re... more The MgAl-LDH adsorbent (2:1) was developed by the urea method and used as an adsorbent for the removal of methyl orange from aqueous solution. The synthesized adsorbent was characterized by a different analytical technique: scanning electron microscope SEM, X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). The effect of adsorption parameters such as solution pH, initial concentration of dye, and the temperature was studied using a static system. X-ray diffraction analysis of the samples confirms the crystal structure of the MgAl-LDH material. The MgAl-LDH adsorbent was efficient in removing MO from aqueous solution, and maximum removal of 98.5 % was observed in the pH range from 2 to 10. The maximum adsorption capacity of MgAl-LDH (2:1) was calculated from the Langmuir isotherm; the maximum quantity is 1250 mg. g-1. The determination of the thermodynamic parameters indicates that the reaction between methyl orange and MgAl-LDH (2:1) is spontaneous and exothermic (ΔH°<0 and ΔG°<0).It can be concluded that LDH adsorbent can be used effectively for the removal of anionic dyes from industrial wastewater.
Low cost adsorbents were prepared from dried plants for the removal of heavy metals, nitrate, and... more Low cost adsorbents were prepared from dried plants for the removal of heavy metals, nitrate, and phosphate ions from industrial wastewaters. The efficiency of these adsorbents was investigated using batch adsorption technique at room temperature. The dried plant particles were characterized by N 2 at 77 K adsorption, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and phytochemical screening. The adsorption experiments showed that the microparticles of the dried plants presented a good adsorption of heavy metals, phosphate, and nitrate ions from real wastewaters. This adsorption increased with increasing contact time. The equilibrium time was found to be 30 min for heavy metals and nitrate ions and 240 min for phosphate ions. After the adsorption process, the Pb(II) concentrations, as well as those of Cd(II), Cu(II), and Zn(II) were below the European drinking water norms concentrations.
Zenodo (CERN European Organization for Nuclear Research), Nov 9, 2018
The purpose of the this study carried out at the Tiznit wastewater treatment plant (WWTP) is to e... more The purpose of the this study carried out at the Tiznit wastewater treatment plant (WWTP) is to evaluate the purification performance of the conventional stabilization ponds type process and, on the other hand, to improve the purification performance by using adsorption process based on novel inert natural materials of animal origin. This project is part of a sustainable development approach, aimed to improve the purification performance of WWTP by introducing lowcost, abundant and inexpensive solid inert biomaterials (SIBM). This adsorption process is recognized as one of the best water treatment techniques, more and more works are oriented towards the search for new materials, cheaper and having a good adsorbent potential. The results obtained with decanted raw wastewater (RWWD) and purified wastewater (PWW) are encouraging and show significant purification yields: 52 % and 48 % for sulfate ions and 43 % and 47 % for nitrate ions, respectively, for RWWD and PWW.
Case Studies in Chemical and Environmental Engineering
The challenge of the scientific community is to synthesize innovative, low-cost, and environmenta... more The challenge of the scientific community is to synthesize innovative, low-cost, and environmentally friendly membrane materials for the treatment of industrial wastewater. The objective of this work is the elaboration and characterization of a new flat ceramic membrane based on a natural Moroccan phengite clay by the paste casting method for microfiltration applications. The ceramic membrane was sintered from 850 °C to 1150 °C for 2 hours. The optimal membrane sintered at 1050 °C has a porosity of 34.5%, an average pore diameter of 3.9 μm, water permeability of 43.50 L/h m2 bar, mechanical strength of 26.7 MPa, and excellent chemical corrosion resistance in acidic and basic media. The performance of the optimal membrane was evaluated by frontal microfiltration of the pre-treated real wastewater (RWW3) from a local clothes washing. The obtained results show that the removal percentage of electrical conductivity, total dissolved solids, and suspended matter is 66.2%, 71.8%, and 100% respectively. The cost of preparing the ceramic membrane was estimated at 3.5 $/m2, which is cheaper compared to those commercially available. The high regeneration efficiency showed that demineralized water was able to adequately clean the fouled microfiltration membrane by 82%. The obtained filtration results are very promising and could allow the use of the membrane prepared from a locally available material as an alternative process in the treatment of various sources of industrial wastewater.
In the present work H 2 PO − 4 and HPO 2− 4 ions adsorption onto organic matter (OM) obtained fro... more In the present work H 2 PO − 4 and HPO 2− 4 ions adsorption onto organic matter (OM) obtained from ground dried three plants growing in arid zones of Morocco has been studied. The adsorption process is affected by various parameters such as contact time, particle size and initial concentration of phosphate solution (C i ≤ 30 mg/l). The uptake of both ions is increased by increasing the concentration of them selves. The retention of phosphate ions by Asphodelus microcarpus, Asparagus albus are well defined by several isotherms such as the Langmuir, Temkin and Freundlich.
Contamination of surface water and groundwater by organic pollutants is a serious problem due to ... more Contamination of surface water and groundwater by organic pollutants is a serious problem due to their persistence, bioaccumulation and biomagnification through food webs. Since the removal of dyes from wastewater is considered an environmental challenge and government legislation requires textile wastewater to be treated, therefore there is a constant need to have an effective process that can efficiently remove these dyes. The aim of the present study is to evaluate the potentiality of dried Carpobrotus edulis plant as low-cost adsorbent for the removal of the industrial acid blue 113 dye from aqueous solutions using the batch equilibration technique. The effects of different physicochemical parameters such as adsorbent dose, contact time, initial dye concentration, solution pH and temperature on adsorption rate of anionic AB113 dye on microparticles of dried C. edulis plant were investigated. The experimental data were analyzed by using mathematical models to determine the thermodynamic parameters. The negative values of free energy change indicated the spontaneous nature of the adsorption and negative value of enthalpy change suggested the exothermic nature of the adsorption process. These results indicate that dried C. edulis plant as an environmentally friendly adsorbent could be potentially used for the removal of anionic dyes from aqueous solutions.
The present research work revolves around the evaluation of the elimination of the cationic dye M... more The present research work revolves around the evaluation of the elimination of the cationic dye Methylene Blue (MB) from an aqueous solution by the exploitation of natural clay (TMG) from SouthEast Morocco. Several physicochemical techniques were used to characterize our TMG adsorbate, namely: X-ray diffraction (XRD), Fourier transform infrared absorption spectroscopy (FTIR), differential thermal analysis (DTA), thermal gravimetric analysis (TGA), and zero charge point (pHpzc). The morphological properties and elemental composition of our material were identified using scanning electron microscopy coupled with an energydispersive X-ray spectrometer (SEM-EDS). The batch technique was used under different operating conditions to produce quantitative adsorption, namely the amount of adsorbent, dye concentration, contact time, pH, and solution temperature. The maximum adsorption capacity of MB on TMG was 81.185 mg g-1 for a concentration of 100 mg L-1 MB at pHinitial= 6.43, temperature 20 °C, and 1 g L-1 adsorbent. The adsorption data were examined by Langmuir, Freundlich, and Temkin isotherms. The Langmuir isotherm provides the best correlation with the experimental data, and the pseudo-second-order kinetic model is more appropriate for the adsorption of the MB dye. The thermodynamic study of MB adsorption indicates that the process is physical, endothermic, and spontaneous. The Box-Behnken method was applied to identify the optimal conditions for MB removal in the design of batch experiments. The parameters examined result in >99% removal.
The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative ... more The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative that operates according to the activated sludge process. Dairy industry is enlisted as one of the top-most industries in the food industry. Dairy wastewater treatment is a big issue as dairy wastewater releases a high amount of chemical oxygen demand, inorganic and organic particles, biological oxygen demand, and nutrients. But, these processes partly degrade wastewater containing fats and nutrients as dairy wastewater. The aim of this study was to evaluate the purification performance of this treatment process. The qualitative analysis of decanted raw wastewater (DRWW) and purified wastewater (PWW) shows that the concentration of orthophosphate, nitrate and sulfate ions is slightly higher. Such contaminated water if not handled appropriately, it pollutes water bodies and largely affects our ecosystem and biodiversity. Hence, our proposal is to improve the WWTP performances by using the ...
The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative ... more The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative that operates according to the activated sludge process. Dairy industry is enlisted as one of the top-most industries in the food industry. Dairy wastewater treatment is a big issue as dairy wastewater releases a high amount of chemical oxygen demand, inorganic and organic particles, biological oxygen demand, and nutrients. But, these processes partly degrade wastewater containing fats and nutrients as dairy wastewater. The aim of this study was to evaluate the purification performance of this treatment process. The qualitative analysis of decanted raw wastewater (DRWW) and purified wastewater (PWW) shows that the concentration of orthophosphate, nitrate and sulfate ions is slightly higher. Such contaminated water if not handled appropriately, it pollutes water bodies and largely affects our ecosystem and biodiversity. Hence, our proposal is to improve the WWTP performances by using the ...
We were interested to the comparative study of normal, simultaneous and successive adsorption of ... more We were interested to the comparative study of normal, simultaneous and successive adsorption of nitrates and orthophosphates ions on the inert solid biomaterials (ISBM) obtained from dried of plants of <em>Carpobrotus edulis </em>(<em>CE</em>). Adsorption is called simultaneous (binary component systems) when it is obtained from a solution which contains nitrates and orthophosphates ions. The adsorption is called successive when we used the ISBM which has already used in another adsorption to equilibrium saturation. The efficiency of this ISBM was investigated using batch adsorption technique under different experiment conditions. These results showed that the adsorption of NO<sub>3</sub><sup>−</sup>and HPO<sub>4</sub><sup>2− </sup>ions from single and binary component systems are identical. This absence of competition between these ions on the sites of adsorption can be explained by their adsorption on differe...
Water pollution is an alarming problem in developing countries. Dried algae can be considered as ... more Water pollution is an alarming problem in developing countries. Dried algae can be considered as potential and suitable bio-sorbents due to their fast and easy growth and high availability. The special surface properties of these algae allow them to adsorb different types of organic and inorganic pollutants from solutions. In this context, the removal of anionic acid blue 113 dye (AB113) from aqueous solutions by dried Corallina officinalis alga as low-cost bio-sorbent was chosen as a case study of a typical remediation process of water contaminants. The effect of various environmental and physicochemical parameters has been studied. The results show that the equilibrium adsorption was established within 120 min. The sorption phenomenon was investigated by determining the process kinetics at different concentrations and the adsorption isotherms at different temperatures. The kinetics results showed that the pseudo second-order kinetics model generates the best agreement with the experimental data. The modeling results showed that linear Langmuir and Freundlich models appear to fit the adsorption data better than Temkin model for the adsorption of AB113 onto dried C. officinalis alga. It can be concluded that C. Officinalis alga can be successfully used as adsorbent.
In this study, the modelling and optimization studies of the carcinogenic acid dye sorption from ... more In this study, the modelling and optimization studies of the carcinogenic acid dye sorption from aqueous solutions were carried out using the Factor Design Methodology. This methodology provides a predictive model of the response in the range of variables studied and determines the optimum conditions for the best performance. The sorption of acid dye AB113 on Moroccan prickly pear cactus peel (MPPCP) was chosen as a case study of a typical removal process. Minitab17 software was used to study the effects of adsorption parameters, including initial dye concentration, solution pH, adsorbent dose, contact time, and temperature. Analysis of variance (ANOVA) was used to evaluate the experimental results obtained. The studied parameters at two levels (-1 and +1) were coded as X1, X2, X3, X4 and X5, consecutively. The optimum conditions obtained for the adsorption of AB113 dye were: 1 g for the mass of MPPCP, 6 for the initial solution pH, 180 min for the contact time and 20 mg/L for the initial dye concentration. The results show that the model is well adapted to the experimental data, indicating the suitability of the model and the success of the factorial design methodology in optimizing the adsorption conditions.
This study aims to prove sand dunes’ color difference across Ziz riversides at Yerdi and then to ... more This study aims to prove sand dunes’ color difference across Ziz riversides at Yerdi and then to investigate sand’s origin and transport pathways. We have opted for remote sensing and Geographic Information System tools as a methodology, in addition to laboratory analyses, that included mineralogy, grain size, and shape investigation of samples collected from studied dunes. The results reveal the following: (i) variation in grain size and shape of the studied sand. A high concentration of quartz and a low amount of carbonates and iron oxide were recorded in the studied dunes. Heavy mineral analyses have shown a similar mineralogical concentration in both samples, yet sand in the left side appears to be richer in hematite and goethite than the right one. (ii) Band ratios 6:4 and 5:7 of Landsat TM allowed the mineralogical distinction of mafic minerals, carbonates, and quartz, while Landsat 3:1 band ratio and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) 2:1 band ratio were the most suitable for iron oxide distinction. The results confirm the dominance of quartz in both sides. However, iron oxide III (Fe3+) concentration is much important in the left side, which explains the difference in sand color. (iii) The studied dunes are potentially supplied from Quaternary, Cretaceous, and Paleozoic formations. The abundance of ferruginous conglomerate among potential formations supplying dunes and the abundance of hematite and goethite in sand from the left bank more than the right explain the red color marking these dunes. While, dunes’ morphodynamic explains the pal color observed in dunes located in the right bank.
This article deals with the valorization of local natural materials of vegetable origin, which ar... more This article deals with the valorization of local natural materials of vegetable origin, which are less expensive and non-toxic through their use in water treatment. We have shown that the acid solution (HCl, 0.5 N) pretreatment of the Carpobrotus edulis plant increases its adsorbent potential towards Methylene Blue and reduces the levels of soluble organic matter that can be released into the water. The bio-adsorbents were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Elemental Analysis (EDX), Zero Point of Charge (PHz), Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD5). The acid treatment allows a reduction in soluble organic matter characterized by a decrease in BOD5 and COD of 91.9% and 88.3% respectively. For the initial concentration of 100 mg/L of MB, the biomaterial obtained after acid treatment (HMCE) has an equilibrium adsorption capacity of 19.61 mg/g compared to 9.91 mg/g for the native plant (NCE). Acid treatment also reduces the amount of adsorbent required to achieve a maximum rate of adsorption. pH, temperature and ionic strength do not have a major influence on the adsorption of Methylene Blue on the biomaterials studied. This adsorption follows the pseudo-second order kinetic model and is represented by the Langmuir and Freundlich isotherms. It is a spontaneous and endothermic process.
The MgAl-LDH adsorbent (2:1) was developed by the urea method and used as an adsorbent for the re... more The MgAl-LDH adsorbent (2:1) was developed by the urea method and used as an adsorbent for the removal of methyl orange from aqueous solution. The synthesized adsorbent was characterized by a different analytical technique: scanning electron microscope SEM, X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). The effect of adsorption parameters such as solution pH, initial concentration of dye, and the temperature was studied using a static system. X-ray diffraction analysis of the samples confirms the crystal structure of the MgAl-LDH material. The MgAl-LDH adsorbent was efficient in removing MO from aqueous solution, and maximum removal of 98.5 % was observed in the pH range from 2 to 10. The maximum adsorption capacity of MgAl-LDH (2:1) was calculated from the Langmuir isotherm; the maximum quantity is 1250 mg. g-1. The determination of the thermodynamic parameters indicates that the reaction between methyl orange and MgAl-LDH (2:1) is spontaneous and exothermic (ΔH°<0 and ΔG°<0).It can be concluded that LDH adsorbent can be used effectively for the removal of anionic dyes from industrial wastewater.
Low cost adsorbents were prepared from dried plants for the removal of heavy metals, nitrate, and... more Low cost adsorbents were prepared from dried plants for the removal of heavy metals, nitrate, and phosphate ions from industrial wastewaters. The efficiency of these adsorbents was investigated using batch adsorption technique at room temperature. The dried plant particles were characterized by N 2 at 77 K adsorption, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and phytochemical screening. The adsorption experiments showed that the microparticles of the dried plants presented a good adsorption of heavy metals, phosphate, and nitrate ions from real wastewaters. This adsorption increased with increasing contact time. The equilibrium time was found to be 30 min for heavy metals and nitrate ions and 240 min for phosphate ions. After the adsorption process, the Pb(II) concentrations, as well as those of Cd(II), Cu(II), and Zn(II) were below the European drinking water norms concentrations.
Zenodo (CERN European Organization for Nuclear Research), Nov 9, 2018
The purpose of the this study carried out at the Tiznit wastewater treatment plant (WWTP) is to e... more The purpose of the this study carried out at the Tiznit wastewater treatment plant (WWTP) is to evaluate the purification performance of the conventional stabilization ponds type process and, on the other hand, to improve the purification performance by using adsorption process based on novel inert natural materials of animal origin. This project is part of a sustainable development approach, aimed to improve the purification performance of WWTP by introducing lowcost, abundant and inexpensive solid inert biomaterials (SIBM). This adsorption process is recognized as one of the best water treatment techniques, more and more works are oriented towards the search for new materials, cheaper and having a good adsorbent potential. The results obtained with decanted raw wastewater (RWWD) and purified wastewater (PWW) are encouraging and show significant purification yields: 52 % and 48 % for sulfate ions and 43 % and 47 % for nitrate ions, respectively, for RWWD and PWW.
Case Studies in Chemical and Environmental Engineering
The challenge of the scientific community is to synthesize innovative, low-cost, and environmenta... more The challenge of the scientific community is to synthesize innovative, low-cost, and environmentally friendly membrane materials for the treatment of industrial wastewater. The objective of this work is the elaboration and characterization of a new flat ceramic membrane based on a natural Moroccan phengite clay by the paste casting method for microfiltration applications. The ceramic membrane was sintered from 850 °C to 1150 °C for 2 hours. The optimal membrane sintered at 1050 °C has a porosity of 34.5%, an average pore diameter of 3.9 μm, water permeability of 43.50 L/h m2 bar, mechanical strength of 26.7 MPa, and excellent chemical corrosion resistance in acidic and basic media. The performance of the optimal membrane was evaluated by frontal microfiltration of the pre-treated real wastewater (RWW3) from a local clothes washing. The obtained results show that the removal percentage of electrical conductivity, total dissolved solids, and suspended matter is 66.2%, 71.8%, and 100% respectively. The cost of preparing the ceramic membrane was estimated at 3.5 $/m2, which is cheaper compared to those commercially available. The high regeneration efficiency showed that demineralized water was able to adequately clean the fouled microfiltration membrane by 82%. The obtained filtration results are very promising and could allow the use of the membrane prepared from a locally available material as an alternative process in the treatment of various sources of industrial wastewater.
In the present work H 2 PO − 4 and HPO 2− 4 ions adsorption onto organic matter (OM) obtained fro... more In the present work H 2 PO − 4 and HPO 2− 4 ions adsorption onto organic matter (OM) obtained from ground dried three plants growing in arid zones of Morocco has been studied. The adsorption process is affected by various parameters such as contact time, particle size and initial concentration of phosphate solution (C i ≤ 30 mg/l). The uptake of both ions is increased by increasing the concentration of them selves. The retention of phosphate ions by Asphodelus microcarpus, Asparagus albus are well defined by several isotherms such as the Langmuir, Temkin and Freundlich.
Contamination of surface water and groundwater by organic pollutants is a serious problem due to ... more Contamination of surface water and groundwater by organic pollutants is a serious problem due to their persistence, bioaccumulation and biomagnification through food webs. Since the removal of dyes from wastewater is considered an environmental challenge and government legislation requires textile wastewater to be treated, therefore there is a constant need to have an effective process that can efficiently remove these dyes. The aim of the present study is to evaluate the potentiality of dried Carpobrotus edulis plant as low-cost adsorbent for the removal of the industrial acid blue 113 dye from aqueous solutions using the batch equilibration technique. The effects of different physicochemical parameters such as adsorbent dose, contact time, initial dye concentration, solution pH and temperature on adsorption rate of anionic AB113 dye on microparticles of dried C. edulis plant were investigated. The experimental data were analyzed by using mathematical models to determine the thermodynamic parameters. The negative values of free energy change indicated the spontaneous nature of the adsorption and negative value of enthalpy change suggested the exothermic nature of the adsorption process. These results indicate that dried C. edulis plant as an environmentally friendly adsorbent could be potentially used for the removal of anionic dyes from aqueous solutions.
The present research work revolves around the evaluation of the elimination of the cationic dye M... more The present research work revolves around the evaluation of the elimination of the cationic dye Methylene Blue (MB) from an aqueous solution by the exploitation of natural clay (TMG) from SouthEast Morocco. Several physicochemical techniques were used to characterize our TMG adsorbate, namely: X-ray diffraction (XRD), Fourier transform infrared absorption spectroscopy (FTIR), differential thermal analysis (DTA), thermal gravimetric analysis (TGA), and zero charge point (pHpzc). The morphological properties and elemental composition of our material were identified using scanning electron microscopy coupled with an energydispersive X-ray spectrometer (SEM-EDS). The batch technique was used under different operating conditions to produce quantitative adsorption, namely the amount of adsorbent, dye concentration, contact time, pH, and solution temperature. The maximum adsorption capacity of MB on TMG was 81.185 mg g-1 for a concentration of 100 mg L-1 MB at pHinitial= 6.43, temperature 20 °C, and 1 g L-1 adsorbent. The adsorption data were examined by Langmuir, Freundlich, and Temkin isotherms. The Langmuir isotherm provides the best correlation with the experimental data, and the pseudo-second-order kinetic model is more appropriate for the adsorption of the MB dye. The thermodynamic study of MB adsorption indicates that the process is physical, endothermic, and spontaneous. The Box-Behnken method was applied to identify the optimal conditions for MB removal in the design of batch experiments. The parameters examined result in >99% removal.
The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative ... more The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative that operates according to the activated sludge process. Dairy industry is enlisted as one of the top-most industries in the food industry. Dairy wastewater treatment is a big issue as dairy wastewater releases a high amount of chemical oxygen demand, inorganic and organic particles, biological oxygen demand, and nutrients. But, these processes partly degrade wastewater containing fats and nutrients as dairy wastewater. The aim of this study was to evaluate the purification performance of this treatment process. The qualitative analysis of decanted raw wastewater (DRWW) and purified wastewater (PWW) shows that the concentration of orthophosphate, nitrate and sulfate ions is slightly higher. Such contaminated water if not handled appropriately, it pollutes water bodies and largely affects our ecosystem and biodiversity. Hence, our proposal is to improve the WWTP performances by using the ...
The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative ... more The study is carried out at the wastewater treatment plant (WWTP) of an agricultural cooperative that operates according to the activated sludge process. Dairy industry is enlisted as one of the top-most industries in the food industry. Dairy wastewater treatment is a big issue as dairy wastewater releases a high amount of chemical oxygen demand, inorganic and organic particles, biological oxygen demand, and nutrients. But, these processes partly degrade wastewater containing fats and nutrients as dairy wastewater. The aim of this study was to evaluate the purification performance of this treatment process. The qualitative analysis of decanted raw wastewater (DRWW) and purified wastewater (PWW) shows that the concentration of orthophosphate, nitrate and sulfate ions is slightly higher. Such contaminated water if not handled appropriately, it pollutes water bodies and largely affects our ecosystem and biodiversity. Hence, our proposal is to improve the WWTP performances by using the ...
We were interested to the comparative study of normal, simultaneous and successive adsorption of ... more We were interested to the comparative study of normal, simultaneous and successive adsorption of nitrates and orthophosphates ions on the inert solid biomaterials (ISBM) obtained from dried of plants of <em>Carpobrotus edulis </em>(<em>CE</em>). Adsorption is called simultaneous (binary component systems) when it is obtained from a solution which contains nitrates and orthophosphates ions. The adsorption is called successive when we used the ISBM which has already used in another adsorption to equilibrium saturation. The efficiency of this ISBM was investigated using batch adsorption technique under different experiment conditions. These results showed that the adsorption of NO<sub>3</sub><sup>−</sup>and HPO<sub>4</sub><sup>2− </sup>ions from single and binary component systems are identical. This absence of competition between these ions on the sites of adsorption can be explained by their adsorption on differe...
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Papers by Mohamed CHIBAN