Rachid Laamari - Academia.edu (original) (raw)

Papers by Rachid Laamari

Physical Chemistry Research, 2021

The removal efficiency of Sulfamethazine as a representative antibiotic (SMT) on a new and eco-fr... more The removal efficiency of Sulfamethazine as a representative antibiotic (SMT) on a new and eco-friendly activated carbon provided from watermelon seeds species as adsorbent has been studied in simple systems. Some experimental parameters, namely the pH, the amount of adsorbent and the contact time are studied. The results showed that the weak chemical bond (π-π EDA interaction) dominated the sorption of SMT to watermelon seeds. The present adsorbent played an important role in the sorption of SMT, leading to a higher sorption capacity onto watermelon seeds (90.78 mg/g). The solvent effect is been studied to show that the electron-donor-acceptor (EDA) interaction is the main adsorption mechanism of SMT antibiotic and that adsorption capacity increases with the increase of dipole moment of solvents. A kinetic study showed that the removal efficiency process followed the pseudo-second-order model and the Langmuir isotherm was the best model to fit and describe the phenomenon in the sin...

Mineralogy

The main objective of this work was to investigate the potential of Natural Safiot Clay (NSC), as... more The main objective of this work was to investigate the potential of Natural Safiot Clay (NSC), as an adsorbent for the removal of two cationic dyes such as Basic Blue 9 (BB9) and Basic Yellow 28 (BY28) from single and binary systems in aqueous solutions. For this, the effects of three factors controlling the adsorption process, such as initial dye concentration, adsorbent dose, and initial pH on the adsorption extent, were investigated and examined. The natural safiot clay was characterized using the following technique: energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), DRX, and Fourier transform infrared (FT-IR) and pH of the point of zero charge (pHZPC). Energy-dispersive X-ray spectroscopy results indicate high percentages of Silica and Alumina. FT-IR spectrum identified kaolinite as the major mineral phase in the presence of quartz, calcite, and dolomite. The quantum theoretical study confirms the experimental results, through the study of the globa...

Journal of the Iranian Chemical Society

The removal of a ternary mixture of cationic dyes, Basic Blue 41 (BB41), Safranin (SAF), and Basi... more The removal of a ternary mixture of cationic dyes, Basic Blue 41 (BB41), Safranin (SAF), and Basic Yellow 28 (BY28) onto Bombax buonopozense bark as a new eco-friendly adsorbent was studied experimentally and theoretically in single as in ternary system, to explore the removal efficiency of the complex mixture and the increase in the number of species in wastewater subject of removal efficiency. Several parameters like pH, adsorbent amount, and concentration effect are studied experimentally to investigate the variation of the removal efficiency of dyes in single and ternary systems. The tested adsorbent was characterized by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and dispersive X-ray spectroscopy (EDX). Basic Blue 41 and Safranin shows a little decrease in removal efficiency between single and ternary system contrary to Basic Yellow 28, and the removal efficiency decreases from 79 to 34%, due to the competition of dyes on the active sites. The problem of interference between spectra of dyes is solved using derivative spectrometry. The adsorption of the three dyes in a single and ternary system follows the pseudo-second-order model, and Langmuir is the best model to describe the adsorption process in both systems. The theoretical study of adsorption of the ternary mixture of cationic dyes onto Bombax buonopozense adsorbent with a negatively charged surface shows that BB41 dye is more electrophilic than Safranin, and they are more electrophilic than BY28. The electrophilic power of the dye has a direct influence on the removal efficiency in the ternary system. The theoretical results are in good accordance with the experimental data reported.

Anti-Corrosion Methods and Materials, 2019

Purpose This paper aims to study the corrosion inhibition of Methyl 2-(benzamido)-2-(4-phenyl-1H-... more Purpose This paper aims to study the corrosion inhibition of Methyl 2-(benzamido)-2-(4-phenyl-1H-1,2,3-triazol-1-yl) acetate (MBPTA) and Methyl 2-(benzamido)-2-(4-p-tolyl-1H-1,2,3-triazol-1-yl) acetate (MBTTA) in 1 M H2SO4 solution at 25 °C. Design/methodology/approach The authors have used weight loss measurements, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, FT-IR, quantum chemical calculations and scanning electron microscopy (SEM) techniques. Findings The polarization measurements indicate that both compounds are mixed type inhibitors, and that MBTTA is more effective than MBPTA. The effect of temperature on the corrosion behavior using optimal concentration of MBTTA and MBPTA was studied in the temperature range 298-328 K. SEM was used to examine the morphology of the metal surface. Thermodynamic parameters were calculated and discussed. Monte Carlo simulations were applied to lookup for the most stalls configuration and adsorption energy for the ...

L'effet inhibiteur de l’acide hexamethylene diamine tetra methylene phosphonique (HMDTMP) sur... more L'effet inhibiteur de l’acide hexamethylene diamine tetra methylene phosphonique (HMDTMP) sur la corrosion du fer en milieu H2SO4 1M a ete etudie a l'aide des methodes electrochimiques et gravimetriques. Les courbes de polarisation indiquent que le compose est un inhibiteur mixte, reduisant a la fois les courants de corrosion cathodique et anodique. L’adsorption de HMDTMP a la surface du fer suit l’isotherme du modele de Langmuir, et la valeur obtenue de l’energie libre de Gibbs confirme la nature chimique de l'adsorption. Les mesures d’impedance electrochimiques montrent que la variation des parametres d'impedance (Rt et Cdl) avec la concentration de HMDTMP est indicative. L'adsorption de cette molecule conduit a la formation d'une couche protectrice sur la surface du fer.

Arabian Journal of Chemistry, 2016

The inhibitive effect of the hexamethylenediamine tetra(methylene phosphonic acid) (HMDTMPA) on t... more The inhibitive effect of the hexamethylenediamine tetra(methylene phosphonic acid) (HMDTMPA) on the corrosion of carbon steel in 1.0 M HCl solution has been investigated by weight loss measurement, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The presence of (HMDTMPA) reduces remarkably the corrosion rate of carbon steel in acidic solution. The effect of temperature on the corrosion behavior of carbon steel was studied in the range of 298-328 K. Results clearly reveal that the (HMDTMPA) behaves as a mixed type corrosion inhibitor with the highest inhibition at 4 • 10 À3 M. The adsorption of HMDTMPA on the carbon steel surface obeys to the Langmuir's adsorption isotherm. Surface analysis via scanning electron microscope (SEM) shows a significant improvement on the surface morphology of the carbon steel plate.

Journal of Electroanalytical Chemistry, 2004

The effect of a new class of corrosion inhibitors, namely the monofluorophosphate of calcium, on ... more The effect of a new class of corrosion inhibitors, namely the monofluorophosphate of calcium, on the corrosion of iron, nickel, and copper in 3% NaCl solution has been investigated using potentiodynamic polarisation, measurement of open circuit potential, X-ray photoemission spectroscopy (XPS), and scanning electron microscope (SEM) techniques. The addition of an increasing concentration of calcium monofluorophosphate causes a shift of the corrosion potential in the positive direction, with a decrease of the anodic current density. The adsorption characteristics of this compound on the metal surface play a significant role in the inhibition process.

The inhibitive effect of the piperidin-1-yl-phospho nic acid (PPA) on the corrosion of iron in 0.... more The inhibitive effect of the piperidin-1-yl-phospho nic acid (PPA) on the corrosion of iron in 0.5 M H 2 SO 4 solution has been investigated by weight loss measu rement, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techni ques. The presence of (PPA) reduces remarkably the corrosion rate of iron in acidic solution. The effe ct of temperature on the corrosion behavior of iron was studied in the range of 298–328 K. Our results clea rly reveal that the (PPA) behaves as a mixed type corrosion inhibitor with the highest inhibition at 5 mM. The adsorption of PPA on the iron surface obe ys to the Langmuir's adsorption isotherm.

International Journal of Molecular Sciences

This review accounts for the most recent and significant research results from the literature on ... more This review accounts for the most recent and significant research results from the literature on the design and synthesis of 1,2,3-triazole compounds and their usefulness as molecular well-defined corrosion inhibitors for steels, copper, iron, aluminum, and their alloys in several aggressive media. Of particular interest are the 1,4-disubstituted 1,2,3-triazole derivatives prepared in a regioselective manner under copper-catalyzed azide-alkyne cycloaddition (CuAAC) click reactions. They are easily and straightforwardly prepared compounds, non-toxic, environmentally friendly, and stable products to the hydrolysis under acidic conditions. Moreover, they have shown a good efficiency as corrosion inhibitors for metals and their alloys in different acidic media. The inhibition efficiencies (IEs) are evaluated from electrochemical impedance spectroscopy (EIS) parameters with different concentrations and environmental conditions. Mechanistic aspects of the 1,2,3-triazoles mediated corrosio...

Decolorization of aqueous solutions containing an azo dye (Reactive Yellow 84) was achieved by ad... more Decolorization of aqueous solutions containing an azo dye (Reactive Yellow 84) was achieved by advanced oxidative process using Fenton reagent. The optimum amounts of Fenton reagent was 25 mg/L of Fe 2+ and 250 mg/L of H2O2 for an initial Reactive Yellow 84 concentration at 60 mg/L. The initial Fe 2+ concentration in the Fenton reagent affected the degradation efficiency, rate and kinetics. The ratio of Fe 2+ /H2O2 is found equal to 0.1 to give the best result for the decolorization efficiency. The Fenton process was effective under pH 3 and the decolorization efficiency of Reactive Yellow 84 attained 85% for 20 min reaction time. Kinetics decolorization of RY84 followed pseudo second-order reaction. The reaction characteristic of oxidative reaction for decolorization efficiency process was evaluated as thermodynamically spontaneous under natural conditions. The value of activation energy is determined and is equal to 16.78 kJ/mol, this low value may show that the oxidative reaction...

International Journal of Environmental Analytical Chemistry, 2021

The objective of this study was the utilisation of Cucumis melo biomass as a new precursor to pro... more The objective of this study was the utilisation of Cucumis melo biomass as a new precursor to produce highly efficient activated carbons by chemical activation method using phosphoric acid (H3PO4) ...

The inhibition effect of cyclohexylphosphonic acid (CHPA) on the corrosion of structural steel (E... more The inhibition effect of cyclohexylphosphonic acid (CHPA) on the corrosion of structural steel (EN 10027) in 3.5% sodium chloride solution has been studied by using potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) technique and weight loss measurements for a wide enough temperature range (298–328 K). Electrochemical results confirmed that the examined inhibitor can effectively suppress the structural steel corrosion in 3.5% sodium chloride solution with an inhibition efficiency of 93% after 30 min of immersion. Potentiodynamic polarization results revealed that CHPA is a well mixed-type inhibitor, and its adsorption on structural steel surface in 3.5% NaCl-fulfilled with the Langmuir isotherm. Both chemi-and physisorption of CHPA take place on the structural steel, resulting in the formation of a protective layer, which was evidenced by SEM observations. Density functional theory and molecular dynamics (MD) were carried out to clarify the inhibitor/me...

The main objective of this study was to investigate the potential of Natural Safiot Clay (NSC) ob... more The main objective of this study was to investigate the potential of Natural Safiot Clay (NSC) obtained from Safi city (Morocco), as an adsorbent for the removal of two cationic dyes such as Basic ...

The corrosion inhibitory effect of (1-benzyl-1H-1,2,3-triazol-4-yl) methanol (BTM) for mild steel... more The corrosion inhibitory effect of (1-benzyl-1H-1,2,3-triazol-4-yl) methanol (BTM) for mild steel in 1 M HCl at (298–328 K) was studied using electrochemical impedance spectroscopy (EIS), Tafel polarization curves and weight loss measurements. Polarization measurements revealed the mixed type inhibitor character. The inhibiting action of this molecule is discussed in terms of blocking the electrode surface by the adsorption of inhibitor molecules obeying Langmuir isotherm. Quantum chemical calculations using the Density Functional Theory (DFT) were performed to determine the relationship between molecular structure and its inhibition efficiency. Monte Carlo simulations were also applied to search for the most stable configuration and adsorption energies for the interaction of the inhibitor with Fe surface. The theoretical data obtained are, in most cases, in agreement with experimental results.

In this study, the adsorption potential of activated carbon prepared from Ziziphus mauritiana nut... more In this study, the adsorption potential of activated carbon prepared from Ziziphus mauritiana nuts for the removal of methylene blue (MB) from aqueous solution has been investigated using batch mode experiments. The effects of some operating parameters on the removal dye such as, initial pH (2–12), temperature (298–328 K), initial MB concentration (20–100 mg L−1), and contact time (5–70 min) were investigated. Adsorption kinetic showed that the rate adsorption followed the pseudo-second-order kinetic model. Four adsorption isotherms models were applied to experimental equilibrium data (Langmuir, Freundlich, Redlich–Peterson, and Fritz–Schlunder) and the different constants were calculated using non-linear equations models. Fritz–Schlunder model was found the best one to describe the adsorption process which suggests that the adsorption of MB onto activated carbon derived from Ziziphus mauritiana is heterogeneous with a multilayer. Thermodynamic adsorption showed that the process was...

Powdered and activated carbon prepared from persea nuts are used as economical adsorbents for the... more Powdered and activated carbon prepared from persea nuts are used as economical adsorbents for the rapid removal and fast adsorption of Basic Blue 9 dye from the aqueous solutions. The adsorption behaviors of dye onto powdered and activated carbon adsorbents were studied in batch experiments as a function of contact time, pH value, initial dye concentration and temperature. Adsorption data fitted better using the Langmuir isotherm, and the calculated maximum adsorption capacities were (79.36 mg/g) for activated carbon adsorbent and of (44.44 mg/g) for powdered adsorbent. The kinetic data were better described by pseudo-second order kinetic model. The analysis of the thermodynamic parameter, positive values of enthalpy energy indicated that the adsorption process of Basic Blue 9 (0.94 k.J/mol for powdered adsorbent and was of 9.34 k.J/mol using activated carbon adsorbent) onto both adsorbents was endothermic. The positive values of ΔS0 of (15.95 kJ/mol K for powdered adsorbent) and (6...

The inhibiting action of thiomorpholin-4-ylmethyl-phosphonic acid (TMPA) was investigated as the ... more The inhibiting action of thiomorpholin-4-ylmethyl-phosphonic acid (TMPA) was investigated as the corrosion inhibitor of iron in 0.5M sulphuric acid (H 2 SO 4 ) solution with the aid of potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS) and weight loss measurements. The results revealed that thiomorpholin-4-ylmethyl-phosphonic acid (TMPA) is a good, mixed type inhibitor. The inhibition efficiency of TMPA on iron corrosion increases with increase in concentration of (H 2 SO 4 ) and decreases with increase in temperature. The adsorption isotherm model of TMPA on the iron surface was in conformity with Langmuir isotherm model. Thermodynamic parameters were calculated and discussed. The local reactivity, analyzed by using Parr functions, shows that both sulphur and nitrogen atoms of TMPA are the main adsorption sites.

International Journal of Environmental Analytical Chemistry