Papers by Abdessamad Tounsi
Notulae Scientia Biologicae, May 28, 2024
Vietnam Journal of Chemistry, May 10, 2024
Microbes and Infectious Diseases /Microbes and Infectious Diseases, Feb 8, 2024
Journal of solid state electrochemistry, Jan 31, 2024
Journal of Chemical Technology and Metallurgy, Jan 30, 2023
In this paper, we compared the corrosion inhibiting effect of two essential oils on mild steel in... more In this paper, we compared the corrosion inhibiting effect of two essential oils on mild steel in 1 M HCl. The essential oils are extracted from natural plants harvested in Morocco and prepared through distillation. To carry out this work, we used gravimetric and electrochemical methods, including current-potential plots and impedance spectroscopy. The results obtained show that both essential oils are a good corrosion inhibitor and that the inhibition efficiency of wormwood essential oil reaches a value of more than 80 % at 298 K. To learn the fundamentals of how inhibitors interact with metal surfaces, wormwood essential oil adsorption on a mild steel surface was also investigated. The Langmuir isotherm model is revealed to be how the essential oils adsorb on the metal surface. The effect of temperature on the performance of mild steel in 1 M HCl with wormwood essential oil was examined in the temperature range of 313 to 353 K. Additionally, calculations and discussions are made to provide some thermodynamic data for the adsorption processes. This work enters the framework for the use of non-toxic products in green chemistry.
Current Chemistry Letters, Dec 31, 2023
Molecular electron density theory has been performed with the B3LYP/6-31(d,p) method to study the... more Molecular electron density theory has been performed with the B3LYP/6-31(d,p) method to study the [3+2] cycloaddition processes between azidobenzene and propionaldehyde, the reactivity indices, activation and reaction energies are computed. The reaction and activation energies indicate that this [3+2] cycloaddition reaction is regiospecific, in good agreement with the experimental results. ELF examination revealed that the mechanism of these cycloaddition reactions takes place in two steps. In addition, a docking approach was performed on the products investigated, and the interaction with the protein protease COVID-19 (PDB ID: 6LU7), the results confirm that the presence of triazole and isoxazole rings increases the affinity of these products.
Analytical Chemistry Letters, Sep 2, 2023
Radioprotection, Sep 30, 2023
Journal of Molecular Graphics & Modelling, Nov 30, 2023
Monatshefte für Chemie, Jun 13, 2024
Hydrological Sciences Journal, 2015
The objective of this study is to evaluate the impact of climate change on the hydrological balan... more The objective of this study is to evaluate the impact of climate change on the hydrological balance of the Comoe basin, an area of rainfed agriculture. Frequency analysis of cropping seasons, with estimation of cumulative water deficit through a daily water balance simulation (1950-2000), was used to explore the impact of variation in climate conditions on the cropping season. The performance indicators show an uneven evolution of agroclimatic potential: in a unimodal regime centred on the north of the basin, the cropping season duration, which did not change significantly, is consistent with the small changes in onset and end dates to that season; however, the cumulative water deficit increased from 750 mm to more than 850 mm. In contrast, in the bimodal regime, the western fringe, while less affected by both the recession and the rainfall deficit, undergoes an unusually short duration of cropping season. Thus, the second cropping season no longer lasts 90 days and seems less compatible with some cropping cycles. Such drought could increase the risk in annual cereal production without, however, being a leading limiting factor.
European Journal of Chemistry, 2013
The corrosion inhibition characteristics of pandanus tectorius extract on corrosion of steel in 1... more The corrosion inhibition characteristics of pandanus tectorius extract on corrosion of steel in 1 M H2SO4 were investigated using chemical and electrochemical measurements at various temperatures (30, 40, 50 and 60 °C). The effect of acid concentration on the corrosion rate of steel increases with acid concentration (0.25-2.00 M) showing first order corrosion reaction without changing the reaction mechanism. The results showed that when the concentration of pandanus tectorius extract increased from 5% to 15% (v:v), the rate of steel corrosion is decreased, which indicated that pandanus tectorius extract are good inhibitor for steel corrosion in 1 M H2SO4 at 30 °C and attains 88.02% at 15% (v:v) from weight loss method. Electrochemical results showed that the investigated extract was acted as mixed type inhibitor. The free energy of adsorption ΔGads for pandanus tectorius, indicates that the process was spontaneous and physically adsorbed (physisorption) onto the steel surface. Also, scanning electron microscopy (SEM) is used to support the obtained result. The trend of inhibition efficiency with temperature suggests physical adsorption of this extract on the corroding steel surface. Thermodynamic functions ∆Eapp, ∆H* and ∆S* has been calculated and are discussed. Steel Sulfuric acid Corrosion inhibition Effect of temperature Pandanus tectorius extract Chemical and electrochemical measurements
Journal of Molecular Structure, May 1, 2022
International Journal of Environmental Science and Technology, Feb 8, 2022
The present paper aims to study the phytoremediation of a polymetallic abandoned mine site in the... more The present paper aims to study the phytoremediation of a polymetallic abandoned mine site in the northwest of Marrakesh, Morocco, by exploring the potential of the symbiotic relationship between Pinus halepensis and the ectomycorrhizal fungi belonging to the Scleroderma genus. This process was combined with the use of sand to neutralize the acidic mine tailings (pH < 3) and to stabilize the heavy metals. Inoculated and non-inoculated plants were grown under greenhouse conditions in a substrate containing different proportions of mine tailings: 0%, 10%, 25%, 50%, 75% and 100% mixed with sand as an amendment. After a growth period of six months, the results showed a significant increase (p≤\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\le$$\end{document} 0.05) of the pH (11%) and the electrical conductivity of the substrate (29%). Moreover, these treatments significantly increased (p≤\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\le$$\end{document} 0.05) the amounts of metallic trace elements, lead (39%), cadmium (22%) and zinc (28%) in the roots of inoculated seedlings compared to non-inoculated ones. The bioaccumulation factor reached a value higher than 1, and the translocation factor recorded a value below 1 particularly for zinc in all treatments and for copper and lead in the 25%, 50% and 75% treatments, indicating that Pinus halepensis has the ability to accumulate significant concentrations of these metals in its roots, thus making a suitable plant for phytoremediation or phytostabilization programs. The results of this study also revealed that the mine tailing amendment had a significant impact on the efficiency of the phytoremediation process toward the metals detected in these polluted soils.
Three lactones including dihydrofuran-2(3H)-one (L1), tetrahydro-2H-pyran-2-one (L2) and oxepan-2... more Three lactones including dihydrofuran-2(3H)-one (L1), tetrahydro-2H-pyran-2-one (L2) and oxepan-2-one (L3) have been investigated for the corrosion of mild steel in 1M HCl at different concentrations at 308K using weight loss measurements, potentiodynamic polarization and impedance spectroscopy (EIS) methods. Generally, inhibition efficiency of the investigated compounds was found to depend on the concentration and the nature of the inhibitor. A comparison
Corrosion Science, 2008
Electrochemical techniques, weight loss method and surface analysis were used to study the synerg... more Electrochemical techniques, weight loss method and surface analysis were used to study the synergistic inhibition offered by Zn 2+ and piperidin-1-yl-phosphonic acid (PPA) to the corrosion of Armco iron in 3% chloride solution. It is observed that the combination between PPA and Zn 2+ shows excellent inhibition efficiency. The potentiodynamic polarization curves reveal that 5 Â 10 À3 mol l À1 of PPA has only 76.7% inhibition efficiency whereas the mixture containing 5 Â 10 À3 mol l À1 PPA-20%Zn 2+ has 90.2% inhibition efficiency. This suggests that a synergistic effect exists between Zn 2+ and PPA. The Fourier transform infrared (FTIR) spectrum of the film formed on iron indicates phosphonates zinc salt formation. A suitable mechanism of corrosion inhibition is proposed based on the results obtained. The surface film analysis showed that in the absence of Zn 2+ , the protective film consists of Fe 2+-PPA complex formed on the anodic sites of the metal surface, whereas in the presence of Zn 2+ , the protective film consists of Fe 2+-PPA complex and Zn(OH) 2 .
Monatshefte für Chemie - Chemical Monthly
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Papers by Abdessamad Tounsi