Several approaches are currently explored to build devices exploiting nano-size effects in energy... more Several approaches are currently explored to build devices exploiting nano-size effects in energy and life-sciences. Self-assembling emerges as a master bottom-up technique to enable the applications of nanomaterials into the real world. Among these applications, image sensing and processing requires capabilities that are beyond the technology of current image sensors, such as automated color-based quality inspection systems operating under varying levels of illumination (2). I will describe the recent outcomes of our network of collaborative research aimed at exploiting the benefits of organic (4), graphene (6),(8), detecting, photocatalysis (1) 'Frontiers in
The materials used as corrosion inhibitors are [Zn-Al-Cl], [Mg-Al-Cl], [Ni-Fe-Cl], and [Co-Fe-Cl]... more The materials used as corrosion inhibitors are [Zn-Al-Cl], [Mg-Al-Cl], [Ni-Fe-Cl], and [Co-Fe-Cl] layered double hydroxides (LDHs). They were synthesized by coprecipitation and characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and thermal anal-yses. The efficiency of these corrosion inhibitors on mild steel in concentrated hydrochloric acid (18.5%) at 60°C (chemical pickling conditions of steel) was studied using electrochemical and gravimetric methods for different concentrations. The surface morphology and composition were examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The inhibitory efficiency in the case of 1.2 g.L-1 LDH was found to be 83.33%, 83.65%, 68.38%, and 74.73% for [Ni- Fe-Cl], [Zn-Al-Cl], [Co-Fe-Cl], and [Mg-Al-Cl], respectively.
Azoic dyes are known as toxic contaminants. Methyl orange is one of these dyes, is removed from w... more Azoic dyes are known as toxic contaminants. Methyl orange is one of these dyes, is removed from wastewater principally through biological, chemical or physical processes. This article will describe the removal of the methyl orange from the water by adsorption onto activated carbon. This material is characterized before and after use in adsorption by various techniques. The methyl orange adsorption efficiency was studied varying contact time, the mass of activated carbon, pH, initial solution concentration, and temperature. The adsorption was found fast attainment equilibrium in 30 min with better performance for the sorbent and appears to be enhanced by low pH. Kinetic data for methyl orange was found to follow pseudo-second order model and the Langmuir model better describes the adsorption process. A maximum amount of methyl orange adsorbed was registered at 113.63 mg/g. The influence of temperature on adsorption and the thermodynamic study showed that free energy and the enthalpy exhibit negative and positive values, respectively, which shows that the methyl orange adsorption on the activated carbon is a spontaneous and endothermic process. The desorption/regeneration process was studied by using different percentages of ethanol and distilled water and it appears to be the best desorption to regenerate methyl orange. The use of 90% ethanol gave a rate of adsorbed methyl orange regeneration close to 89%. On other hand, these results indicate the significance of activated carbon as new support for the elimination of the methyl orange.
potential scan rate of 200 mVs-1, two voltametric waves on the platen; which corresponds to two s... more potential scan rate of 200 mVs-1, two voltametric waves on the platen; which corresponds to two successive and reversible processes to a single electron, leading to the formation of a diamine [24]. Moreover, the genotoxicity studies in vitro have shown that pPD, like several other aromatic amines which belong to the aniline family can react with DNA and cause breaks [25-47]. Picardo et al. have shown that pPD at high concentrations and for long exposure time induced cell cycle block and toxicity, but at low concentrations (10 µg/mL)and for shorter periods exposure (30 min) increased keratinocyte proliferation [39]. Habti et al. [6] have shown that pPD at low concentrations (5µg/mL) and for 2h exposure time gives RBC temporary resistance to hemolysis in hypotonic blend, the mechanism remains unexplained till now [6]. The aim of our study is to contribute to elucidate the molecular mechanism responsible for this temporary resistance. Material and Methods Collection of human blood sample Blood samples from volunteer donors, and healthy aged 25-35 years were collected in tubes of 7 mL containing EDTA.
Journal of Electrochemical Science and Engineering
The application of copper as a material in various fields is widely recognized. However, in acidi... more The application of copper as a material in various fields is widely recognized. However, in acidic environments, the electrical and mechanical properties of copper undergo negative alterations, resulting in its dissolution. To protect copper from degradation, the most effective approach is to employ inhibitors. Hence, in this paper, the expired ibuprofen drug has been investigated as a corrosion inhibitor for copper in 0.5 M H2SO4, employing weight loss and electrochemical tests. Compared with the pharmaceutical products used by other researchers in this field, the results showed that ibuprofen is highly effective in protecting copper from corrosion. It was noted that the inhibitory efficacy of ibuprofen increases with concentration. In addition, it was found that its adsorption follows Langmuir isotherm.
2019 7th International Renewable and Sustainable Energy Conference (IRSEC)
nanoparticles of MnWO4 were synthesized by the coprecipitation method in order to study its elect... more nanoparticles of MnWO4 were synthesized by the coprecipitation method in order to study its electrochemical performances which makes it a promising material for energy storage in supercapacitors. We aim to discover also the effect of magnesium substitution on the crystal structure and on the capacitance of the electrode. The structure was successfully obtained and subsequently confirmed using X-ray diffraction, FT-IR ATR spectroscopy and SEM. In addition, to describe the electrochemical behaviour, the samples of MnWO4 and Mn (1-x) MgxWO4 (x=0.03, 0.05, 0.1, 0.15) were characterized by cyclic voltammetry which showed remarkable results as electrode material, their capacitive properties have been explored by electrochemical impedance spectroscopy using KOH as an aqueous electrolyte to choose an optimum concentration that lead to a better electrochemical characteristics, The results obtained will be explained afterwards.
2019 International Conference of Computer Science and Renewable Energies (ICCSRE)
Morocco's commitment to the development of renewable energy was confirmed at COP 22 in Marrak... more Morocco's commitment to the development of renewable energy was confirmed at COP 22 in Marrakech, during which Morocco announced the decision to increase the share of renewable energies from 42% of installed capacity planned for 2020 to 52% by 2030.Morocco's energy strategy, which attaches great importance to the development of renewable energies and energy efficiency, is based on four fundamental objectives, aimed at:•Enhancing security of supply and energy availability;•Generalized access to energy at competitive prices;•Demand management;•The preservation of the environment.Among these renewable energies is biomass.Household waste in Morocco contains almost 65% to 75% organic matter, so a very large amount of biomass.Waste recovery is the most optimal waste management solution. It not only eliminates the large quantities of waste produced every day, but also generates the energy needed by a constantly changing population.The objective of this research work is to assess the household waste potential for electrical and thermal energy generation in Fez city (Morocco) using two modes of energy recovery: combustion and anaerobic digestion.The maximum electric generated was 228.04 GWh/year from direct combustion of household waste, whereas for thermal energy, a maximum value of 633.46 GWh/year in 2016. For anaerobic digestion, the maximum electric generated was 50.02 GWh/year and thermal energy generated was 75.79 GWh/year in 2016.
REVUE DE L’ENTREPRENEURIAT ET DE L’INNOVATION, Jul 23, 2018
Contrairement à l'énergie fossile, les énergies renouvelables sont équitablement réparties dans l... more Contrairement à l'énergie fossile, les énergies renouvelables sont équitablement réparties dans le monde. Cependant, ces énergies ne sont pas disponibles de façon continue. Elles se présentent sous cinq formes principales : hydraulique, éolienne, solaire, biomasse et géothermique. L'énergie hydraulique est saisonnière, localisée et peut être stockée dans des barrages. La biomasse est aussi saisonnière mais ses produits tel que le bois sont commodément stockables. L'énergie solaire est journalière quand le temps est clair. Cependant, la chaleur, forme d'énergie solaire et de la géothermie, se conserve très mal, même sur une période courte. L'énergie éolienne est souvent disponible aux heures creuses. Celle-ci ainsi que le solaire photovoltaïque produisent directement de l'énergie électrique, produit d'un courant par une tension, qui est une forme d'énergie bien adaptée à son transport et à sa distribution, mais ne se stocke pas. Les formes de stockage de l'électricité, condensateurs ou bobines supraconductrices sont adaptées à des stockages de courte durée et de faibles quantités d'énergie. Il faut donc convertir cette forme d'énergie en d'autre formes stockables telles que l'énergie mécanique et l'énergie chimique, thermique ou structurelle choisies selon la durée de stockage souhaitée.
2019 International Conference on Wireless Technologies, Embedded and Intelligent Systems (WITS), 2019
The generation of household waste is inevitable. With the development of the population year afte... more The generation of household waste is inevitable. With the development of the population year after year and the increase in the standard of living, the quantities of waste are increasing exponentially and their efficient management has become a priority to municipal authorities worldwide. The Moroccan government has recognized the importance of efficient resource management and the establishment of a circular economy as development of traditional waste management. In 2008, the State Secretariat for Sustainable Development and the Interior Ministry of Morocco with the support of the World Bank have elaborated the National Household Waste Management Program (PNDM), which targets for the next few years the quantitative objectives of waste collection (90% in 2020), the implementation of controlled landfills and the development of waste sorting, recycling and valorization. Waste recovery is the most optimal management solution that not only eliminates the large quantities of waste produced each day but also creates the energy needed for a constantly changing population. The objective of this research work is to assess the household waste potential for electrical and thermal energy generation in Fez city (Morocco) using two modes of energy recovery: combustion and anaerobic digestion. The maximum electric generated was 228.04 GWh from direct combustion of household waste, whereas for thermal energy, a maximum value of 633.46 GWh in 2016. For anaerobic digestion, the maximum electric generated was 50.02 GWh and thermal energy generated was 75.79 GWh in 2016.
The high chemical and biological reactivity of para-phenylenediamine (pPD) has been illustrated i... more The high chemical and biological reactivity of para-phenylenediamine (pPD) has been illustrated in several studies, including polymerization genotoxicity and oxidative stress at the level of the plasma membrane cells. However, its reactivity with red blood cells (RBC) was rarely explored. The aim of this study is to help expound the molecular actions of pPD in hypotonic environment of human RBC by conducting biological tests for the globular resistance and physicochemical cyclic voltammetry and UV-visible spectroscopy. Our results show that the pPD at low concentration gives RBC temporary resistance (30 min) against hemolysis in hypotonic environment with 4.5 g / L NaCl. Spectrometry results for UV-visible and cyclic voltammetry suggest that membrane stability is due to the presence of the polymer poly-pPD. Key words: Para-phenylenediamine (pPD), cyclic voltammetry, red blood cells, the stability of the membrane, temporary resistance poly-pPD.
2018 Renewable Energies, Power Systems & Green Inclusive Economy (REPS-GIE), 2018
Water electrolysis is a promising method for efficient production of high purity oxygen and hydro... more Water electrolysis is a promising method for efficient production of high purity oxygen and hydrogen. Even though noble-metal oxides (PtO<inf>2</inf> IrO<inf>2</inf>, RuO<inf>2</inf>, and RhO<inf>2</inf>) are the most active materials for the oxygen evolution reaction, low-cost transition metal oxides are typically used in alkaline electrolysis due to their abundance and relatively high activity and stability. Thus, nickel, cobalt, and manganese have been extensively explored as bifunctional catalysts, capable of catalyzing both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) for the conversion and storage of energy. To improve their catalytic properties, different strategies are used; either by changing the method of preparation or the doping of metal ions. In this paper, we describe the preparation of Mn<inf>0.5</inf>Ni<inf>1.5</inf>CoO<inf>4</inf>oxide by sol-gel method, and we discuss a comparison of electrocatalytic properties between NiO, Mn<inf>0.5</inf>Ni<inf>1.5</inf>CoO<inf>4</inf>and Pt/C.
2018 Renewable Energies, Power Systems & Green Inclusive Economy (REPS-GIE), 2018
A huge quantity of biogas is emitted from non-regulated municipal solid waste landfill to the atm... more A huge quantity of biogas is emitted from non-regulated municipal solid waste landfill to the atmosphere. Many researchers have been done with the purpose to estimate the quantity of generated methane gas, capture, and to use this energy source to produce electricity or heat. Since then, many models have been developed in this direction. Mathematical modeling for methane production is a tool used to project methane generation over time from a mass of buried waste. These models are used for energy exploitation, sizing of biogas collection systems and for regulatory purposes. Several types of mathematical models are developed to estimate the production of biogas. Those are generally based on zero-order, first-order and second-order decomposition kinetics. Others are digital in nature and are very accurate, but their use requires several inputs that are not always available to managers. First-order models are the most used because of the tradeoff between accuracy of results and ease of use. Those are often used to respond to requests for national inventories, for life cycle analysis and to comply with corresponding regulations. First-order models can describe multiphase structures containing several categories of buried materials, and provide better prediction accuracy than zero-order models. The purpose of this paper is to estimate the amount of methane generation from Fez landfill, which is the first largest landfill in Morocco. To achieve that, the first-order model was used to predict the amount of methane generation.
Depuis quelques annees, des niveaux tres eleves de performances ont ete obtenus avec des piles a ... more Depuis quelques annees, des niveaux tres eleves de performances ont ete obtenus avec des piles a combustible h#2-o#2(air) type spe. Fc comprenant des electrodes de puissance associees a des membranes a conduction protonique. Au cours de ce travail, nous avons developpe un modele physique representatif de la couche active, qui nous a permis de tirer des conclusions utiles au perfectionnement des electrodes a hydrogene. Ainsi, nous avons pu montrer theoriquement qu'il est possible de reduire la quantite de platine dans ces electrodes (jusqu'a 0,1 mg/cm#2) tout en conservant les memes performances electrochimiques. Ceci a ete egalement demontre experimentalement. Par ailleurs, nous avons applique une methode statistique plan d'experience pour l'etude de l'influence des differents parametres rentrant dans le processus de fabrication de la pile ainsi que celle de leurs interactions. Ce travail presente aussi l'etude de l'influence de la temperature, de la pres...
The driving idea and the main objective of this synthetic work is the study of physicochemical fa... more The driving idea and the main objective of this synthetic work is the study of physicochemical factors such as the dielectric constant of the solvent, the polarizability of the chains and the Gap energy of the conductive polymers, these characteristics condition their properties. electrical and electrochemical. We focused our study on polyaniline, two synthetic methods are presented: chemical polymerization and electropolymerization with emphasis on the theoretical aspects of the phenomena involved as well as on the electrochemical methods used such as cyclic voltammetry. We have therefore developed with maximum clarity the links existing between the physico-chemical properties of polyaniline and its electrical conductivity.
Several approaches are currently explored to build devices exploiting nano-size effects in energy... more Several approaches are currently explored to build devices exploiting nano-size effects in energy and life-sciences. Self-assembling emerges as a master bottom-up technique to enable the applications of nanomaterials into the real world. Among these applications, image sensing and processing requires capabilities that are beyond the technology of current image sensors, such as automated color-based quality inspection systems operating under varying levels of illumination (2). I will describe the recent outcomes of our network of collaborative research aimed at exploiting the benefits of organic (4), graphene (6),(8), detecting, photocatalysis (1) 'Frontiers in
The materials used as corrosion inhibitors are [Zn-Al-Cl], [Mg-Al-Cl], [Ni-Fe-Cl], and [Co-Fe-Cl]... more The materials used as corrosion inhibitors are [Zn-Al-Cl], [Mg-Al-Cl], [Ni-Fe-Cl], and [Co-Fe-Cl] layered double hydroxides (LDHs). They were synthesized by coprecipitation and characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and thermal anal-yses. The efficiency of these corrosion inhibitors on mild steel in concentrated hydrochloric acid (18.5%) at 60°C (chemical pickling conditions of steel) was studied using electrochemical and gravimetric methods for different concentrations. The surface morphology and composition were examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The inhibitory efficiency in the case of 1.2 g.L-1 LDH was found to be 83.33%, 83.65%, 68.38%, and 74.73% for [Ni- Fe-Cl], [Zn-Al-Cl], [Co-Fe-Cl], and [Mg-Al-Cl], respectively.
Azoic dyes are known as toxic contaminants. Methyl orange is one of these dyes, is removed from w... more Azoic dyes are known as toxic contaminants. Methyl orange is one of these dyes, is removed from wastewater principally through biological, chemical or physical processes. This article will describe the removal of the methyl orange from the water by adsorption onto activated carbon. This material is characterized before and after use in adsorption by various techniques. The methyl orange adsorption efficiency was studied varying contact time, the mass of activated carbon, pH, initial solution concentration, and temperature. The adsorption was found fast attainment equilibrium in 30 min with better performance for the sorbent and appears to be enhanced by low pH. Kinetic data for methyl orange was found to follow pseudo-second order model and the Langmuir model better describes the adsorption process. A maximum amount of methyl orange adsorbed was registered at 113.63 mg/g. The influence of temperature on adsorption and the thermodynamic study showed that free energy and the enthalpy exhibit negative and positive values, respectively, which shows that the methyl orange adsorption on the activated carbon is a spontaneous and endothermic process. The desorption/regeneration process was studied by using different percentages of ethanol and distilled water and it appears to be the best desorption to regenerate methyl orange. The use of 90% ethanol gave a rate of adsorbed methyl orange regeneration close to 89%. On other hand, these results indicate the significance of activated carbon as new support for the elimination of the methyl orange.
potential scan rate of 200 mVs-1, two voltametric waves on the platen; which corresponds to two s... more potential scan rate of 200 mVs-1, two voltametric waves on the platen; which corresponds to two successive and reversible processes to a single electron, leading to the formation of a diamine [24]. Moreover, the genotoxicity studies in vitro have shown that pPD, like several other aromatic amines which belong to the aniline family can react with DNA and cause breaks [25-47]. Picardo et al. have shown that pPD at high concentrations and for long exposure time induced cell cycle block and toxicity, but at low concentrations (10 µg/mL)and for shorter periods exposure (30 min) increased keratinocyte proliferation [39]. Habti et al. [6] have shown that pPD at low concentrations (5µg/mL) and for 2h exposure time gives RBC temporary resistance to hemolysis in hypotonic blend, the mechanism remains unexplained till now [6]. The aim of our study is to contribute to elucidate the molecular mechanism responsible for this temporary resistance. Material and Methods Collection of human blood sample Blood samples from volunteer donors, and healthy aged 25-35 years were collected in tubes of 7 mL containing EDTA.
Journal of Electrochemical Science and Engineering
The application of copper as a material in various fields is widely recognized. However, in acidi... more The application of copper as a material in various fields is widely recognized. However, in acidic environments, the electrical and mechanical properties of copper undergo negative alterations, resulting in its dissolution. To protect copper from degradation, the most effective approach is to employ inhibitors. Hence, in this paper, the expired ibuprofen drug has been investigated as a corrosion inhibitor for copper in 0.5 M H2SO4, employing weight loss and electrochemical tests. Compared with the pharmaceutical products used by other researchers in this field, the results showed that ibuprofen is highly effective in protecting copper from corrosion. It was noted that the inhibitory efficacy of ibuprofen increases with concentration. In addition, it was found that its adsorption follows Langmuir isotherm.
2019 7th International Renewable and Sustainable Energy Conference (IRSEC)
nanoparticles of MnWO4 were synthesized by the coprecipitation method in order to study its elect... more nanoparticles of MnWO4 were synthesized by the coprecipitation method in order to study its electrochemical performances which makes it a promising material for energy storage in supercapacitors. We aim to discover also the effect of magnesium substitution on the crystal structure and on the capacitance of the electrode. The structure was successfully obtained and subsequently confirmed using X-ray diffraction, FT-IR ATR spectroscopy and SEM. In addition, to describe the electrochemical behaviour, the samples of MnWO4 and Mn (1-x) MgxWO4 (x=0.03, 0.05, 0.1, 0.15) were characterized by cyclic voltammetry which showed remarkable results as electrode material, their capacitive properties have been explored by electrochemical impedance spectroscopy using KOH as an aqueous electrolyte to choose an optimum concentration that lead to a better electrochemical characteristics, The results obtained will be explained afterwards.
2019 International Conference of Computer Science and Renewable Energies (ICCSRE)
Morocco's commitment to the development of renewable energy was confirmed at COP 22 in Marrak... more Morocco's commitment to the development of renewable energy was confirmed at COP 22 in Marrakech, during which Morocco announced the decision to increase the share of renewable energies from 42% of installed capacity planned for 2020 to 52% by 2030.Morocco's energy strategy, which attaches great importance to the development of renewable energies and energy efficiency, is based on four fundamental objectives, aimed at:•Enhancing security of supply and energy availability;•Generalized access to energy at competitive prices;•Demand management;•The preservation of the environment.Among these renewable energies is biomass.Household waste in Morocco contains almost 65% to 75% organic matter, so a very large amount of biomass.Waste recovery is the most optimal waste management solution. It not only eliminates the large quantities of waste produced every day, but also generates the energy needed by a constantly changing population.The objective of this research work is to assess the household waste potential for electrical and thermal energy generation in Fez city (Morocco) using two modes of energy recovery: combustion and anaerobic digestion.The maximum electric generated was 228.04 GWh/year from direct combustion of household waste, whereas for thermal energy, a maximum value of 633.46 GWh/year in 2016. For anaerobic digestion, the maximum electric generated was 50.02 GWh/year and thermal energy generated was 75.79 GWh/year in 2016.
REVUE DE L’ENTREPRENEURIAT ET DE L’INNOVATION, Jul 23, 2018
Contrairement à l'énergie fossile, les énergies renouvelables sont équitablement réparties dans l... more Contrairement à l'énergie fossile, les énergies renouvelables sont équitablement réparties dans le monde. Cependant, ces énergies ne sont pas disponibles de façon continue. Elles se présentent sous cinq formes principales : hydraulique, éolienne, solaire, biomasse et géothermique. L'énergie hydraulique est saisonnière, localisée et peut être stockée dans des barrages. La biomasse est aussi saisonnière mais ses produits tel que le bois sont commodément stockables. L'énergie solaire est journalière quand le temps est clair. Cependant, la chaleur, forme d'énergie solaire et de la géothermie, se conserve très mal, même sur une période courte. L'énergie éolienne est souvent disponible aux heures creuses. Celle-ci ainsi que le solaire photovoltaïque produisent directement de l'énergie électrique, produit d'un courant par une tension, qui est une forme d'énergie bien adaptée à son transport et à sa distribution, mais ne se stocke pas. Les formes de stockage de l'électricité, condensateurs ou bobines supraconductrices sont adaptées à des stockages de courte durée et de faibles quantités d'énergie. Il faut donc convertir cette forme d'énergie en d'autre formes stockables telles que l'énergie mécanique et l'énergie chimique, thermique ou structurelle choisies selon la durée de stockage souhaitée.
2019 International Conference on Wireless Technologies, Embedded and Intelligent Systems (WITS), 2019
The generation of household waste is inevitable. With the development of the population year afte... more The generation of household waste is inevitable. With the development of the population year after year and the increase in the standard of living, the quantities of waste are increasing exponentially and their efficient management has become a priority to municipal authorities worldwide. The Moroccan government has recognized the importance of efficient resource management and the establishment of a circular economy as development of traditional waste management. In 2008, the State Secretariat for Sustainable Development and the Interior Ministry of Morocco with the support of the World Bank have elaborated the National Household Waste Management Program (PNDM), which targets for the next few years the quantitative objectives of waste collection (90% in 2020), the implementation of controlled landfills and the development of waste sorting, recycling and valorization. Waste recovery is the most optimal management solution that not only eliminates the large quantities of waste produced each day but also creates the energy needed for a constantly changing population. The objective of this research work is to assess the household waste potential for electrical and thermal energy generation in Fez city (Morocco) using two modes of energy recovery: combustion and anaerobic digestion. The maximum electric generated was 228.04 GWh from direct combustion of household waste, whereas for thermal energy, a maximum value of 633.46 GWh in 2016. For anaerobic digestion, the maximum electric generated was 50.02 GWh and thermal energy generated was 75.79 GWh in 2016.
The high chemical and biological reactivity of para-phenylenediamine (pPD) has been illustrated i... more The high chemical and biological reactivity of para-phenylenediamine (pPD) has been illustrated in several studies, including polymerization genotoxicity and oxidative stress at the level of the plasma membrane cells. However, its reactivity with red blood cells (RBC) was rarely explored. The aim of this study is to help expound the molecular actions of pPD in hypotonic environment of human RBC by conducting biological tests for the globular resistance and physicochemical cyclic voltammetry and UV-visible spectroscopy. Our results show that the pPD at low concentration gives RBC temporary resistance (30 min) against hemolysis in hypotonic environment with 4.5 g / L NaCl. Spectrometry results for UV-visible and cyclic voltammetry suggest that membrane stability is due to the presence of the polymer poly-pPD. Key words: Para-phenylenediamine (pPD), cyclic voltammetry, red blood cells, the stability of the membrane, temporary resistance poly-pPD.
2018 Renewable Energies, Power Systems & Green Inclusive Economy (REPS-GIE), 2018
Water electrolysis is a promising method for efficient production of high purity oxygen and hydro... more Water electrolysis is a promising method for efficient production of high purity oxygen and hydrogen. Even though noble-metal oxides (PtO<inf>2</inf> IrO<inf>2</inf>, RuO<inf>2</inf>, and RhO<inf>2</inf>) are the most active materials for the oxygen evolution reaction, low-cost transition metal oxides are typically used in alkaline electrolysis due to their abundance and relatively high activity and stability. Thus, nickel, cobalt, and manganese have been extensively explored as bifunctional catalysts, capable of catalyzing both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) for the conversion and storage of energy. To improve their catalytic properties, different strategies are used; either by changing the method of preparation or the doping of metal ions. In this paper, we describe the preparation of Mn<inf>0.5</inf>Ni<inf>1.5</inf>CoO<inf>4</inf>oxide by sol-gel method, and we discuss a comparison of electrocatalytic properties between NiO, Mn<inf>0.5</inf>Ni<inf>1.5</inf>CoO<inf>4</inf>and Pt/C.
2018 Renewable Energies, Power Systems & Green Inclusive Economy (REPS-GIE), 2018
A huge quantity of biogas is emitted from non-regulated municipal solid waste landfill to the atm... more A huge quantity of biogas is emitted from non-regulated municipal solid waste landfill to the atmosphere. Many researchers have been done with the purpose to estimate the quantity of generated methane gas, capture, and to use this energy source to produce electricity or heat. Since then, many models have been developed in this direction. Mathematical modeling for methane production is a tool used to project methane generation over time from a mass of buried waste. These models are used for energy exploitation, sizing of biogas collection systems and for regulatory purposes. Several types of mathematical models are developed to estimate the production of biogas. Those are generally based on zero-order, first-order and second-order decomposition kinetics. Others are digital in nature and are very accurate, but their use requires several inputs that are not always available to managers. First-order models are the most used because of the tradeoff between accuracy of results and ease of use. Those are often used to respond to requests for national inventories, for life cycle analysis and to comply with corresponding regulations. First-order models can describe multiphase structures containing several categories of buried materials, and provide better prediction accuracy than zero-order models. The purpose of this paper is to estimate the amount of methane generation from Fez landfill, which is the first largest landfill in Morocco. To achieve that, the first-order model was used to predict the amount of methane generation.
Depuis quelques annees, des niveaux tres eleves de performances ont ete obtenus avec des piles a ... more Depuis quelques annees, des niveaux tres eleves de performances ont ete obtenus avec des piles a combustible h#2-o#2(air) type spe. Fc comprenant des electrodes de puissance associees a des membranes a conduction protonique. Au cours de ce travail, nous avons developpe un modele physique representatif de la couche active, qui nous a permis de tirer des conclusions utiles au perfectionnement des electrodes a hydrogene. Ainsi, nous avons pu montrer theoriquement qu'il est possible de reduire la quantite de platine dans ces electrodes (jusqu'a 0,1 mg/cm#2) tout en conservant les memes performances electrochimiques. Ceci a ete egalement demontre experimentalement. Par ailleurs, nous avons applique une methode statistique plan d'experience pour l'etude de l'influence des differents parametres rentrant dans le processus de fabrication de la pile ainsi que celle de leurs interactions. Ce travail presente aussi l'etude de l'influence de la temperature, de la pres...
The driving idea and the main objective of this synthetic work is the study of physicochemical fa... more The driving idea and the main objective of this synthetic work is the study of physicochemical factors such as the dielectric constant of the solvent, the polarizability of the chains and the Gap energy of the conductive polymers, these characteristics condition their properties. electrical and electrochemical. We focused our study on polyaniline, two synthetic methods are presented: chemical polymerization and electropolymerization with emphasis on the theoretical aspects of the phenomena involved as well as on the electrochemical methods used such as cyclic voltammetry. We have therefore developed with maximum clarity the links existing between the physico-chemical properties of polyaniline and its electrical conductivity.
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