Mama el Rhazi

Mama el Rhazi
Université Hassan II de Casablanca · Department of Chemistry - Faculty of Sciences and Technologies - Mohammedia

24.78
 · 
PhD in Electrochemistry; Pierre et marie Curie Université - Paris6
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Research items (56)
Article
A carbon paste electrode (CPE) modified with a nanocomposite consisting on functionalized multiwalled carbon nanotubes, polypyrrole film (PPy) and bismuth particles is described for simultaneous determination of Pb(II) and Cd(II). The structural and surface properties of the functionalized multiwalled carbon nanotubes and the nanocomposite were inv...
Article
The aim of this work is the elaboration of a novel cheap material with high electrocatalytic activity towards methanol electrooxidation. Carbon paste electrode were modified by electropolymerization of poly-(para-phenylenediamine) by cyclic voltammetry during 15 consecutive potential cycles between −0.3 V and 0.9 V vs Ag/AgCl at 50 mVs−1 in 0.1 mol...
Answer
We can use also Nafion to avoid dsoption of some molécules.. Nafion perfluorinated membranes with a negative charge acts as permeable membrane..
Article
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Over the years, intensive research works have been devoted to conducting polymers due to their potential application in many fields such as fuel cell, sensors, and capacitors. To improve the properties of these compounds, several new approaches have been developed which consist in combining conducting polymers and nanoparticles. Then, this review i...
Article
A new method has been described for carbaryl determination using a simple electrochemical sensor. The unique properties of poly‐pPhenylenediamine and ionic liquid were exploited to fabricate carbon paste electrode modified with composite based on conducting polymer/ionic liquid. Electrode surface characterization was performed by electrochemical me...
Article
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In the framework of understanding the transport mechanism that governs the filtration of NO3⁻ solution through a γ-Al2O3 membrane with a nominal pore size of 5 nm at low ultrafiltration, a series of various types of nitrate solutions and operating conditions were investigated. The effect of filtration parameters such as pH, applied pressure and NO3...
Article
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A new and simple approach for carbaryl determination in natural sample was proposed using Low Silica X (LSX) zeolite modified carbon paste electrode. LSX zeolite with a porous structure was incorporated into carbon paste electrode in the appropriate portion. The prepared electrode was then characterized using scanning electron microscopy, cyclic vo...
Article
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p class="PaperAbstract"> An electrochemical method was developed for voltammetric determination of p-phenylenediamine using a carbon paste electrode (CPE). The electrode exhibited the highest electrocatalytic activity toward oxidation and reduction of p-phenylenediamine in the phosphate buffer, pH 7 solution. After optimizing the experimental condi...
Article
In this paper, a new nanocomposite of polypyrrole (PPy) and carbon nanofibers (CNFs)-modified carbon paste electrode (CPE) has been reported for the determination of traces lead ions (Pb²⁺). The obtained nanocomposite was fabricated by combining the unique advantages of PPy and CNFs using a very simple approach, which consists on modifying the CPE...
Conference Paper
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Le développement de nouveaux catalyseurs pour l'oxydation du méthanol pose des grands défis au chercheurs et industriels. Les études montrent que tous les catalyseurs sont basés sur les nanocomposites qui combinent les métaux de transition (Pt, Ru, Pd, etc.) et les nanomatériaux à base de carbone comme le graphène, les nanotubes de carbone et les n...
Conference Paper
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Les nanomatériaux à base de nanotube de carbone ont ouvert la voie à des applications dans les piles à combustible au méthanol direct à hautement performant. La décoration des nanoparticules et d'autres fonctionnalisations de la surface du nanotube de carbone ont augmenté l’activité catalytique intrinsèque du nanotube de carbone nu dans les applica...
Article
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A nanocomposite based on a carbon nanofiber/conducting polymers and nickel nanoparticles was developed using cyclic voltammetry. The dispersion, morphology, conductivity and structure of the modified electrode are characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectra (EIS) and chronoamperome...
Article
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The electrochemical behavior of carbon paste electrode modified with carbon nanofibers has been studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scaning electron microscopy. The response of modified electrodein ferroferricyanidesolutionshows reversible behavior and significant increment in current value compar...
Article
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A new carbon paste electrode (CPE) modified with extract takaout was developed for the determination of mercury using square wave voltammetry (SWV). Compared with carbon paste electrode, the anodic peak current had a significant increase at the modified electrode. Under the optimized conditions (amount of modifier 3%, 0.1 M acetate buffer pH 2, acc...
Conference Paper
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Combination of conducting polymer matrix and Carbon nanomaterials (CNMs) such as graphene, carbon nanofibers(CNFs) and carbon nanotubes to form polymer nanocomposites play a very promising role due to their better structural and functional properties such as high aspect ratio, high mechanical strength high electrical properties etc[1-2]. In the oth...
Article
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Speciation of mercury compounds in environmental and biological samples requires different techniques and different approaches. This speciation is mandatory to explain the toxicity, the reactivity and the bioavailability of mercury. It is dominated by inorganic mercury species Hg(II) and Hg(0), and the organic mercury species CH3Hg and (CH3)2Hg. In...
Article
In this work, we propose an electrochemical application of Poly(1,8-Diaminonaphthalene) and Nickel ions Particles (NiPs) modified carbon paste electrode (CPE) to electrocatalytic oxidation of methanol for direct methanol fuel cells (DMFCs). The electrochemical characterization of the film modified carbon paste electrode (CPE/PDAN)/NiPs) has been do...
Article
In the present work, carbon paste electrodes (CPE) modified with conducting polymers (1,8-diaminonaphthalene, 1,8-DAN) combined with rotating disk electrode (RDE) was applied to determine copper in orange juice samples. Copper (II) was preconcentrated at open circuit potential on the modified electrode. Then, the preconcentrated metals were oxidize...
Article
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A new sensor based on carbon paste electrode modified with Poly(1,8-diaminonaphthalene) and bismuth film (Bi-Poly1,8-DAN/CPE) was prepared and characterized with cyclic voltammetry and electrochemical impedance spectroscopy. The sensor was found to exhibit an electroactivity toward the sensing of lead using square wave voltammetry in acidic medium....
Conference Paper
Full-text available
In this work, we propose an electrochemical application of Poly(1,8-Diaminonaphthalene) and Nickel Nanoparticles (NiNPs) modified carbon paste electrode (CPE) to electrocatalytic oxidation of methanol for direct methanol fuel cells (DMFCs). The electrochemical characterization of the film modified carbon paste electrode (CPE/PDAN)/NiNPs) has been don...
Chapter
I obtained my bachelor degree in chemistry at the Faculty of Sciences in Oujda, Morocco. At that time, I was 21 years old and I wanted to continue my studies, so I applied for a master's degree program in Paris. It was not easy for me since I had to find financial support. I was accepted at the University Pierre & Marie Curie in Paris. Accordingly,...
Conference Paper
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This work is divided in two parts, in the first part, The Carbon Paste Electrode (CPE) Modified with 1,8-Diaminonaphthalene (1,8-DAN) and Carbon Nanofiber (CNF) was prepared by mixing fine graphite powder and 1,8-DAN (CPE+1,8-DAN) in addition a small quantity of Carbon Nanofiber suspension was dropped on the (CPE+1,8-DAN) electrode surface, Using c...
Article
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A methodology based on inductively coupled plasma atomic emission spectroscopy (ICP-AES) after microwave assisted acid digestion has been developed and validated to determine the trace element content of traditional Moroccan cosmetic products like henna and takaout purchased in local markets of Morocco. Limit of detection values equal or lower than...
Article
In the past few years, many researches have been devoted to electrochemical sensors based on electrode modified with conducting polymers. The combination of carbon electrode and conducting polymers provide extrordinary properties in term of conductivity and electrochemical sensing. In this review, we focus first on synthesis and charaterisation of...
Conference Paper
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La mies en place d’une nouvelle électrode modifie des nanomatériaux par des polymères conducteur pour des applications électrochimique qu’ont des propriétés physico-chimique très demander. Un électrode modifié homogène de la pate de graphène avec le polymère conducteur (1%) de poly (1,8-Diaminonaphtalène) [poly(1,8-DAN)] a été réalisé par voltamétr...
Article
Full-text available
A methodology based on inductively coupled plasma atomic emission spectroscopy (ICP-AES) after microwave assisted acid digestion has been developed and validated to determine the trace element content of traditional Moroccan cosmetic products like henna and takaout purchased in local markets of Morocco. Limit of detection values equal or lower than...
Article
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Boubo river and lagoon, south Côte d’Ivoire, are contaminated by manganese released in wastewater from manganese exploitation and from the soil of Grand-Lahou region in Côte d’Ivoire. So, there is a need to develop a simple method for the evaluation of manganese present in natural water. This work reports the utility of rapid and inexpensive method...
Conference Paper
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In order to improve the electrochemical performance of conventional carbon paste electrode, different studies have been reported using graphene doped carbon paste electrode, who known to be an excellent candidate of conventional modifier for the preparation of CPE owing to its superior electrical conducting ability. In this study significant atten...
Article
Potentiometric chemically modified carbon paste electrode (CMCPE) that is highly selective to Pb(II) ions was prepared by using lead tetrakis(imidazolyl)borate (PbTImB) as a suitable ion-exchanger. The best electrode performance was obtained with a paste composition of 7.0% PbTImB, 49.5% dioctyl adipate as solvent mediator, and 1.0% PbSO4 as additi...
Article
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The aim of this study is to develop a sensor based on the carbon paste electrodes (CPEs) modified with takawt plant for determination of Cu(II). The measurements were carried out by differential pulse voltammetry (DPV). The Cu(II) ions were chemically deposited onto the surface of takawt natural plant in an acidic medium. The modified electrode exh...
Article
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In this paper, the system based on Bismuth Film Electrodes BiFEs combined with rotating disk electrode (RDE) was applied to determine lead in beer samples. Lead and bismuth were simultaneously deposited by reduction at -1V on a rotating carbon-paste disk electrode. Then, the preconcentrated metals were oxidized by scanning the potential of the elec...
Article
An inductively coupled plasma optical emission spectroscopic (ICP-OES) method has been developed and fully validated for trace element determination in basil samples. The method involves the previous sample digestion, under pressure, with a mixture of HNO3, HCl and H2O2 inside a microwave oven, 42 elements were studied and 33 elements (Al, As, Ba,...
Article
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A methodology based on inductively coupled plasma optical emission spectroscopy (ICP-OES) after microwave assisted acid digestion has been developed to determine the trace element content of Moroccan argan oil. Limit of detection values equal or lower than few mg/kg were obtained for all elements under study. To assure the accuracy of the whole pro...
Article
This work reports the simultaneous determination of lead and cadmium in canned foods samples using square-wave anodic striping voltammetry (SWASV) on a bismuth film electrode (BiFE). The metal ions and bismuth were simultaneously deposited by reduction at -1 V on a rotating carbon-paste disk electrode. Then, the preconcentrated metals were oxidized...
Article
In the present work, carbon paste electrodes (CPE) modified with conducting polymers 1,8-diaminonaphtalene (DAN) was developed for the voltammetric determination of Cu(II). The modified electrode exhibited a significantly increased sensitivity and selectivity for Cu2+ compared with a bare carbon paste electrode. Copper(II) was preconcentrated at op...
Article
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Les polymères conducteurs ont ouvert grâce à leurs propriétés physico-chimiques et électrochimiques très intéressantes, de nouvelles perspectives dans le domaine des matériaux et dans celui des électrodes modifiées. Grâce à leurs propriétés mécaniques extraordinaires, leur résistance à la corrosion, leur faible coût, les polymères ont pu compléter...
Article
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This work reports the application of fibrinogen‐coated bismuth films deposited on carbon paste electrodes (Fbg‐BiFEs) for the simultaneous determination of trace amounts of lead and cadmium by square‐wave anodic stripping voltammetry, combined with a batch injection analysis technique (BIA‐SWASV). The batch injection analysis system provides the ad...
Article
A voltammetric method for the determination of trace amounts of nitrite is proposed. In acidic solution, 2,3-diaminonaphtalene (DAN) reacts with nitrite to form the 1-N-naphtotriazole. At the end of this reaction, the unreacted DAN was measured at a carbon paste electrode by using differential pulse voltammetry. Different parameters, such as pH of...
Article
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This paper describes a simple and rapid screening system for the extraction and determination of methyl mercury in tissue samples from fish. A novel clean-up procedure based on the use of two immiscible phases, an organic one containing methyl mercury and an aqueous one containing invertase, was developed. Methyl mercury was selectively extracted f...
Article
Carbon paste electrodes were modified by mixing appropriate amounts of the monomers o-phenylendiamine, p-phenylendiamine and m-phenylendiamine (o-PD, p-PD and m-PD) into a graphite powder-paraffin oil matrix. The electropolymerization of the incorporated phenylendiamine was then carried out in a carbon paste electrode in acidic medium by cyclic vol...
Article
Detection of phosphate using amperometry was investigated. The phosphomolybdate complex, formed by addition of nitric acid, ammonium molybdate and phosphate, was reduced at a carbon paste electrode polarised at +0.3V (versus Ag/AgCl). The major characteristics observed were simplicity of the equipment, a limited consumption of reagents and a low de...
Article
The electrochemical oxidation of mono- and disaccharides at various copper-modified electrodes is reported: glassy carbon modified at open circuit or by electrochemical deposition of copper, gold modified by electrochemical deposition, and at bulk copper electrodes. A comparative study of these four electrodes was made by linear sweep voltammetry a...
Article
Carbon paste electrodes modified with conducting polymers for sensitive and selective determination of lead are presented. A novel method for generating a reproducible polymer-coated electrode surface is developed. We prove that 1,8-diaminonaphthalene (1,8-DAN) mixed with a carbon paste electrode leads to a conducting polymer in acidic medium while...
Article
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The determination of mercury(II) ions at the trace level by inhibition of the invertase enzyme-catalysed hydrolysis of sucrose into glucose and fructose coupled to electrochemical batch injection analysis was investigated using two approaches. In the first, the glucose produced was detected by injection of 100 microliters samples into the batch inj...
Article
A selective and sensitive amperometric method of analysis has been developed for determination of the trace amounts of mercury in waters at a platinum electrode based on the effect of the presence of mercury ions on the current due to oxidation of l-tyrosine. A decrease of signal was observed due to the formation of a complex of tyrosine with the H...
Article
The modification of carbon paste matrices with fibrinogen is reported. The effect of the pH of the solution on the CV peak currents of positively or negatively charged redox analytes was examined at the fibrinogen-modified carbon paste electrode. In the presence of the coating, pH-dependent selectivity in electrochemical detection of charged specie...
Article
Ionic insertion or removal from a poly (N-ethylcarbazole) (PECBZ) film modified electrode upon doping/dedoping in perchloric acid was studied by the mirage effect and quartz crystal microbalance (QCMB) techniques. The experimental mirage signal while cycling the potential was compared to the calculated signal based on an exclusive anion exchange li...
Article
On a compare pour le polyethylcarbazole en milieu acide perchlorique 5M, la reponse de la microbalance a quartz et celle de l'effet mirage en regime dynamique. Dans la phase de reduction, seule la sortie des ions perchlorate intervient alors que dans la phase d'oxydation il y a simultanement sortie de protons et entree d'anions. Par impedance massi...
Article
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In this work, the suitability of a carbon paste electrode coupled with differential pulse voltammetry (DPV) has been investigated for the determination of Se(IV) after complexation with 2, 3-Diaminonaphthalene(2,3- DAN). A decrease of oxidation current of 2, 3-DAN was observed due to the formation of a complex of 2, 3- Diaminonaphthalene with Se(IV...