► AHMT is good corrosion inhibitor for carbon steel in 2M H3PO4. ► Tafel polarization study indicates that AHMT is mixed-type of inhibitor. ► Weight loss, polarization and EIS methods are in ...reasonable agreement. ► AHMT adsorption is well described by Langmuir isotherm. ► XPS analysis was used to establish the nature of AHMT adsorption on the carbon steel surface.
The corrosion inhibition properties of purpald (4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT)) on carbon steel in phosphoric acid (2M H3PO4) solution has been examined and characterized by weight loss, Tafel polarization, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) methods. The experimental results reveal that the compound has a good inhibiting effect on the carbon steel in 2M H3PO4 solution. The protection efficiency increases with increasing inhibitor concentration, but the temperature has hardly effect on the inhibition efficiency of AHMT. The adsorption of AHMT is found to obey the Langmuir adsorption isotherm. Thermodynamic data and XPS analysis clearly show that the adsorption mechanism of AHMT on carbon steel surface in 2M H3PO4 solution is mainly electrostatic-adsorption. Potentiodynamic polarization studies have shown that AHMT acts as a mixed-type of inhibitor. Data obtained from EIS studies were analyzed to model inhibition process through appropriate equivalent circuit model.
New diamine derivatives, namely 2-{2-bis-(2-hydroxyethyl)aminoethyl}(2-hydroxyethyl)aminoethanol (DAME) and 2-{2-bis-(2-hydroxyethyl)aminoethyl}(2-hydroxyethyl)aminopropanol (DAMP) were synthesised ...and their inhibitive action against the corrosion of mild steel in 1
M HCl solution were investigated at 308
K. The detailed study of DAME is given using gravimetric measurements and polarization curves method. Results show that DAME is a good inhibitor and inhibition efficiency reaches 91.7% at 10
−3
M. Tafel polarization study revealed that DAME acts as a mixed-type inhibitor. The inhibitor adsorption process in mild steel/DAME/hydrochloric acid system was studied at different temperatures (308–353
K) by means of weight loss measurements. The adsorption of DAME on steel surface obeyed Langmuir’s adsorption isotherm. The kinetic and thermodynamic parameters for mild steel corrosion and inhibitor adsorption, respectively, were determined and discussed. The comparative study of inhibitive performance of the two diamine derivatives revealed that DAME is more effective than DAMP. Quantitative Structure–Activity Relationship (QSAR) approach has been conducted in attempt to correlate the corrosion inhibition properties of these diamine derivatives with their calculated quantum chemical parameters.
In this study, we report the first total hemisynthesis of trans-himachalol sesquiterpene, a stereoisomer of the natural cis-himachalol isolated from Cedrus atlantica essential oils, from himachalenes ...mixture in five steps. Reactions conditions were optimized and structures of the obtained compounds were confirmed by IR, mass spectra, 1H, and 13C NMR. The synthesized compounds were investigated for potential activities on various isolated smooth muscles and against different neurotransmitters using molecular docking. The results show that the synthesized compounds display high affinities towards the active site of the protein 7B2W and the compounds exhibit promising activities on various isolated smooth muscles and against different neurotransmitters.
New cellulose carbamates and cellulose acetate carbamates were prepared by classical addition reaction of isocyanates with alcohols. A Telomerization technique was used to make the grafted molecules ...strongly anchored and more hydrophobic. These molecules were grafted into cellulose and CA chains, respectively. The structures of the synthesized derivatives were confirmed using Nuclear Magnetic Resonance Spectroscopy, Fourier Transform Infrared and Thermogravimetric Analysis, and their solubility phenomenon was also established, and the carbamate derivatives showed better solubility compared to cellulose. Their ability to biodegrade was investigated, and it was concluded that Cell-P
and CA-P
derivatives are more biodegradable than the other samples. These results suggest that the resulting compounds can be used effectively in many useful industrial fields, for instance, eco-friendly food packaging, domains that use materials that are environmentally friendly and sustainable and the development of green chemistry.
The inhibition properties of two 3,5-bis (disubstituted)-4-amino-1, 2,4-triazole derivatives, namely 3,5-bis(4-methoxyphenyl)-4-amino-1,2,4-triazole (T1) and ...3,5-bis(4-chlorophenyl)-4-amino-1,2,4-triazole (T2) were investigated for mild steel corrosion in 2M H3PO4 medium at 308K using electrochemical impedance spectroscopy (EIS), Tafel polarization curves and weight loss measurements. The results showed that the 4-amino-1, 2,4-triazole derivatives (T1 and T2) were good inhibitors in 2M H3PO4, and the inhibition efficiency, η(%), increased with the inhibitor concentration but the temperature had no effect on the inhibition efficiency. The adsorption of T1 and T2 on the mild steel surface obeyed Langmuir's adsorption isotherm. Both thermodynamic and kinetic parameters were calculated and discussed. Data obtained from EIS studies were analysed to model inhibition process through appropriate equivalent circuit model. Potentiodynamic polarization curves revealed that T1 and T2 behave as mixed-type inhibitors. The adsorption behaviour of the 4-amino-1, 2,4-triazole derivatives on Fe (110) surface was investigated by Monte Carlo simulations in the presence of water to verify their corrosion inhibition efficacies. The results indicated that the adsorption energy of T1 was greater than T2, which is in accordance with the experimentally determined inhibition efficiency.
•The inhibition of mild steel corrosion described by triazole derivatives•Polarization measurements indicate that T1 and T2 act as mixed type inhibitors.•The inhibition efficiency was calculated from weight loss and EIS measurements.•The quantum chemical calculation and Monte Carlo simulations were studied.
The corrosion rates in the presence of 2,5-bis(4-methoxyphenyl)-1,3,4-oxadiazole (4-MOX) as a steel corrosion inhibitor in 0.5
M sulfuric acid, were measured by the weight loss method, in the range ...of temperatures from 303 to 343
K. Results obtained revealed that 4-MOX performed excellently as a corrosion inhibitor for mild steel in sulfuric acid media and its efficiency attains more than 96.19% at 8
×
10
−4
M at 333
K. The inhibition was assumed to occur via adsorption of the oxadiazole molecules on the metal surface. The Langmuir adsorption isotherm was tested for their fit to the experimental data. The apparent activation energies, enthalpies and entropies of the dissolution process and the free energies and enthalpies for the adsorption process were determined and discussed. The fundamental thermodynamic functions were used to glean important information about 4-MOX inhibitory behaviour.
Some S-containing compounds newly synthesised have been tested as inhibitors for the corrosion of steel in 1
M HCl solution. Weight loss measurements, potentiodynamic polarisation and impedance ...spectroscopy (EIS) methods are used. The inhibiting action increases with the concentration of the compounds tested. The highest efficiency 95% is obtained at 10
−4
M of (11-hydroxyundecyl)thioacetic acid (
3
and
4
). We note good agreement between gravimetric and electrochemical methods (potentiodynamic polarisation and EIS). Polarisation measurements show also that
3
and
4
act as mixed inhibitors. The cathodic curves indicate that the reduction of proton at the steel surface happens with an activating mechanism.
3
adsorbs on the steel surface according to Langmuir adsorption model. Effect of temperature is also studied between 308
K and 353
K.
The present paper illustrates the investigation of two novel ecological triazole derivative corrosion inhibitors, namely ethyl 2-(4-phenyl-1
H
-1,2,3-triazol-1-yl) acetate Tria-CO
2
Et, and ...2-(4-phenyl-1
H
-1,2,3-triazol-1-yl) acetohydrazide Tria-CONHNH
2
. The studied inhibitors were investigated against the corrosion of mild steel in 1.0 M HCl solution using different electrochemical techniques. Potentiodynamic polarization experiments indicated that the Tria-CO
2
Et, and the Tria-CONHNH
2
acted as mixed type inhibitors. Electrochemical impedance spectroscopy measurements revealed that both inhibitors presented a high inhibition performance, achieving an inhibition efficiency of 95.3% for Tria-CO
2
Et and 95.0% for Tria-CONHNH
2
at a concentration of 1.0 × 10
−3
M. Based on the Langmuir isotherm model and the activation parameters, these triazole derivatives were adsorbed onto a steel surface by physical and chemical bonds. Density functional theory based on B3LYp6-311G(d,p) was also carried out to correlate the inhibition efficiencies obtained experimentally with the theoretical descriptors of the studied molecular structures.
The present paper illustrates the investigation of two novel ecological triazole derivative corrosion inhibitors, namely ethyl 2-(4-phenyl-1
H
-1,2,3-triazol-1-yl) acetate Tria-CO
2
Et, and 2-(4-phenyl-1
H
-1,2,3-triazol-1-yl) acetohydrazide Tria-CONHNH
2
.
In this study, tin dioxide nanoparticles (SnO
NPs) were successfully synthesized through an eco-friendly method using basil leaves extract. The fabricated SnO
NPs demonstrated significant adsorption ...capabilities for phenol (PHE), p-nitrophenol (P-NP), and p-methoxyphenol (P-MP) from water matrices. Optimal conditions for maximum removal efficiency was determined for each phenolic compound, with PHE showing a remarkable 95% removal at a 3 ppm, 0.20 g of SnO
NPs, pH 8, and 30 min of agitation at 35 °C. Molecular docking studies unveiled a potential anticancer mechanism, indicating the ability of SnO
NPs to interact with the epidermal growth factor receptor tyrosine kinase domain and inhibit its activity. The adsorption processes followed pseudo-second order kinetics and Temkin isotherm model, revealing spontaneous, exothermic, and chemisorption-controlled mechanisms. This eco-friendly approach utilizing plant extracts was considered as a valuable tool for nano-sorbent production. The SnO
NPs not only exhibit promise in water treatment and also demonstrate potential applications in cancer therapy. Characterization techniques including scanning electron microscopy, UV-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy (XRD), and energy-dispersive X-ray spectroscopy (EDAX) provided comprehensive insights into the results.
In this work, we are interested in studying the effect of the addition of a heterocyclic organic compound derived from pyridazine named ethyl (6-methyl-3-oxopyridazin-2-yl) acetate (GK2) on ...inhibition of the corrosion of mild steel (C38) in a molar hydrochloric acid solution. This study was performed using the method of weight loss, potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS). Gravimetric measurements indicate that the inhibitor has GK2 efficiency increases with the concentration to reach a maximum value of 83.1% at 10−3 M. In addition, studies revealed that the potentiodynamic polarization act as a mixed inhibitor with predominance at cathodic domain. EIS shows that increasing the concentration of the inhibitor leads to an increase of the charge transfer resistance and reducing the double layer capacitance. Effect of temperature was studied between 308 and 343 K and determination of adsorption and activation parameters is also discussed.
•The new molecule was synthesised in laboratory.•Action inhibitory was studied on mild steel in HCl.•Efficiency attains 83% at 10−3 M.•Inhibitor acted as a mixed type on metal surface.
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