In this study we have investigated the efficiency of surfactants and ligands on cleaning artifici... more In this study we have investigated the efficiency of surfactants and ligands on cleaning artificially contaminated red, sandy and white chalk soil samples from copper ion. Various concentrations of four different surfactants: Triton, X-100, SDS, Tergitol and Tween 80 were used as washing solution for remediation of contaminated soils. Different concentrations of three different ligands (I-, SCN and EDTA) along with nonionic surfactant, Triton X-100, were applied as soil washing agents to desorb copper from artificially contaminated soils.
Heavy metals are persistent pollutants in the environment. Problems associated with the cleanup o... more Heavy metals are persistent pollutants in the environment. Problems associated with the cleanup of sites contaminated by metals have demonstrated the need to develop remediation technologies that are feasible, quick, and effective in a wide range of physical settings. In this study we have investigated the adsorption of Cu(II), onto red soil in single and multi-element systems as a function of soil and heavy metal concentrations. Before contamination, soils were characterized to determine particle size, pH, organic matter content and heavy metal contents. The results of experimental sorption data fitted very well the Freundlich isotherm model with n = 1.4 and k = 1.25 and first order kinetics model. The best pH for adsorption of Cu 2+ on red soil was found to be 4.0. Adsorption of metals on soil increased in the order Cu > Pb > Zn ≈ Cd. This trend might be related to the increase in the electronegativity of the metal ion.
The development of biobased polymeric materials for wastewater purification has become a demand d... more The development of biobased polymeric materials for wastewater purification has become a demand due to the growing need for water free of hazardous metal ions for safe purposes. The organic components of the OLLW including carbohydrates, phenolics, aromatic acids and others are cost-effective and sustainable choices for this application. This work focuses on a method for turning the organic components of liquid waste from the olive industry (OILW) into a foam-based value-added polymer that has several metal ion binding sites. The process of making the target polymers involved reacting the components of the OILW with hexamethylene diisocyante and 1,4-phnyelene diisocynate to create the polymeric materials LHMIDIC and LPDIC that are in foam forms with urethane linkages, respectively. The adsorption competence of the polymeric foams toward Pb(II) was evaluated as a function of various parameters including adsorbent dose, pH, temperature, initial ion concentration and time. The optimum parameters values that led to a quantitative removal of Pb(II) were identified. The obtained thermodynamic parameters showed that the adsorption by the two foams was spontaneous at room temperature. The isothermal and kinetic values showed that the adsorption by synthesized foams follows a second order kinetic and obeys the Langmuir isothermal model. The foams showed a high tendency for removing multi metal ions present in a real sample of wastewater. The original nature of the starting material used in making the foam, cost and the obtained results showed the potential of using the foam in a large-scale plants of wastewater purification.
The inhibition performance of quercetin for C38 steel in1.0MHCl was evaluated by electrochemical ... more The inhibition performance of quercetin for C38 steel in1.0MHCl was evaluated by electrochemical measurements: impedance spectroscopy and polarization curves tests. Results obtained reveal that the quercetin acts excellently as a corrosion inhibitor for C38 steel in 1.0 M HCl. The inhibition efficiency increases with the concentration of the inhibitor to reach 98.2 % at 2.10-6M of the quercetin. Polarization curves showed that the quercetin behaves as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface obeyed the Langmuir adsorption isotherm. The effect of temperature on the corrosion behavior of carbon steel in 1M HCl was also studied. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. Data obtained from EIS technique, were analyzed to model the corrosion inhibition process through appropriate equivalent circuit model; a constant phase element (CPE) has been used. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated and discussed. Quantum chemical parameters were calculated using ab initio and DFT methods to find a good correlation with the inhibition efficiency. A good agreement was found between the theoretical calculations and experimental observations.
Applied Journal of Environmental Engineering Science, 2016
The influence of Tangeretin (TGT) on the inhibition of corrosion on mild steel in hydrochloric ac... more The influence of Tangeretin (TGT) on the inhibition of corrosion on mild steel in hydrochloric acid has been investigated by weight loss, potentiodynamic polarization, electrochemical impedance (EIS). The result of weight loss study shows that the corrosion inhibition efficiency (IE) is directly proportional to the concentration of the inhibitor. Electrochemical study proved that the inhibitor acts as a mixed type inhibitor. Tested inhibitor adsorb on the steel surface according to Langmuir isotherm. From the adsorption isotherm some thermodynamic data for the adsorption process are calculated and discussed.
The corrosion inhibition efficiency of Sulfapyridine(SFP) for carbon steel in 2.0 M H 3 PO 4 has ... more The corrosion inhibition efficiency of Sulfapyridine(SFP) for carbon steel in 2.0 M H 3 PO 4 has been studied using weight loss, polarization, electrochemical and impedance spectroscopy techniques. The results show that SFP is a good inhibitor in 2.0 M H 3 PO 4. Effects of temperature and acid concentration on inhibitive performance were investigated. Polarization curves reveal that SFP acts as a mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing Sulfapyridine concentration. Activation energy of corrosion and other thermodynamic parameters such as standard free energy, standard enthalpy, and standard entropy of the adsorption process revealed better and well-ordered physical adsorption mechanism in the presence of Sulfapyridine. Adsorption isotherms in absence or presence of SFP as inhibitor appropriately fit the Langmuir isotherm. Theoretical investigations have established that the interaction of SFP with the metal steel surface is mainly through the Nitrogen, oxygen atoms, sulphonyl group and the π system of the aromatic ring.
The inhibition effect of sulfathiazole (STZ) on the corrosion inhibition of mild steel in 1.0 M H... more The inhibition effect of sulfathiazole (STZ) on the corrosion inhibition of mild steel in 1.0 M HCl solution was studied by polarization, EIS, weight loss measurements and quantum chemical calculation. It was found that the inhibitor was effective and the inhibition efficiency was significantly increased with increasing concentration. Polarization curves revealed that the used inhibitor represent mixed-type inhibitor. Adsorption of the inhibitor led to a reduction in the double layer capacitance and an increase in the charge transfer resistance, and was found also to obey Langmuir isotherm. A good correlation between theoretical data and experimental data has been obtained.
The influence of three quinoline derivatives (8QNs) namely, ethyl 2-(((8-hydroxyquinolin-5-yl)met... more The influence of three quinoline derivatives (8QNs) namely, ethyl 2-(((8-hydroxyquinolin-5-yl)methyl)amino)acetate (8QN1), 5-((benzylamino)methyl)quinolin-8-ol (8QN2) and 5-(azidomethyl)quinolin-8-ol (8QN3) on the mild steel corrosion in 1 M HCl was studied by weight loss and electrochemical methods. Results showed that 8QN3 shows maximum inhibition efficiency of 90% at 5×10-3 M concentration. Polarization study revealed that the 8QNs act as mixed type inhibitors. EIS measurements showed that the studied compounds inhibit mild steel corrosion by adsorbing on the steel surface. Results showed that inhibition efficiency increases with concentration. Adsorption of 8QNs on the mild steel surface obeyed the Langmuir adsorption isotherm.
The influence of oil of citrus leaves (OCL) concentration and the effect of medium temperature on... more The influence of oil of citrus leaves (OCL) concentration and the effect of medium temperature on the carbon steel corrosion in aqueous 1.0 M hydrochloric acid was realized experimentally using electrochemical impedance spectroscopy, potentiodynamic polarization curves and gravimetric technique. Results showed that the OCL is the excellent inhibitor for steel corrosion and the polarization curves data revealed that the tested compound acts as a mixed type inhibitor with predominant anodic. The study of temperature effect was investigated and leads to the determination of thermodynamic activation parameters. Electrochemical impedance spectroscopy result exhibit one capacitive loop indicating that, the corrosion reaction is controlled by charge transfer process and the presence of this compound decreases the double layer capacitance and increases the charge transfer resistance. The oil of citrus leaves act by adsorption on the carbon steel surface according to a Langmuir isotherm adsorption model.
Applied Journal of Environmental Engineering Science, 2015
Electrochemical measurements for the corrosion inhibition of mild steel in 1 M hydrochloric acid ... more Electrochemical measurements for the corrosion inhibition of mild steel in 1 M hydrochloric acid by 5, 12-Naphthacenequinone H. Lgaz (a), (b)* , R. Salghi (b) , S. Jodeh (c) , K. Toumiat (d) , M. Larouj (a)
Corrosion inhibition of mild steel in hydrochloric acid by 5,5',5''-(nitrilotris (methylene)) tri... more Corrosion inhibition of mild steel in hydrochloric acid by 5,5',5''-(nitrilotris (methylene)) tris-(8-quinolinol) : Experimental, theoretical and molecular dynamic studies H. Lgaz (a) (b) , R. Salghi (b) * , M. Larouj (a) , M. Elfaydy (c) , S. Jodeh (d) , H. Abbout (a) (c) , B. Lakhrissi (c) , K. Toumiat (e) H. Oudda (a)
Background: Human and veterinary antibiotics are typically discharged as parent chemicals in urin... more Background: Human and veterinary antibiotics are typically discharged as parent chemicals in urine or feces and are known to be released into the environment via wastewater treatment plants (WWTPs). Several research investigations have recently been conducted on the removal and bioremediation of pharmaceutical and personal care products (PPCPs) disposed of in wastewater. Results: SiNP-Cu, a chelating matrix, was produced by delaying and slowing 1.5-dimethyl-1H-pyrazole-3-carbaldehyde on silica gel from functionalized with 3-aminopropyltrimethoxysilane. The prepared sorbent material was characterized using several techniques including BET surface area, FT-IR spectroscopy, Scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and nitrogen adsorption-desorption isotherm. The pseudo-second-order model provided the best correlation due to the big match between the experimental and theoretical of different adsorption coefficients. The Langmuir and Freundlich adsorption models were used and the study showed a better match with the Freundlich model with a capacity of removal reached up to 420 mg g −1. The removal capacity was dependent on pH and increased by increasing pH. The removal percentage reached 91;5% at pH = 8. The adsorbent demonstrated a high percentage removal of TMP, reaching more than 94% when increased pH. The sample was simply regenerated by soaking it for a few minutes in 1 N HCl and drying it. The sorbent was repeated five times with no discernible decrease in removal capacity. The thermodynamic study also showed endothermic, increasing randomness and not spontaneous. The free energy was 2.71 kJ/mol at 320 K. The findings of the DFT B3LYP/6-31 + g (d, p) local reactivity descriptors revealed that nitrogen atoms and π-electrons of the benzene and pyrimidine rings in the TMP are responsible for the adsorption process with the SiNP surface. The negative values of the adsorption energies obtained by molecular dynamic simulation indicated the spontaneity of the adsorption process. Conclusion: The global reactivity indices prove that TMP is stable and it can be removed from wastewater using SiNP surface. The results of the local reactivity indices concluded that the active centers for the adsorption process are the
In this study, evaluation and comparison of the effectiveness of some photochemical systemssuch a... more In this study, evaluation and comparison of the effectiveness of some photochemical systemssuch as direct UV photolysis, H2O2/UV, H2O2/Fe2+(Fenton process)and H2O2/Fe2+/UV (Photo-Fenton process) have been investigated in lab-scale experiments to remove Neutral Red(abbreviated as NR)from aqueous solutions. From the experimental results, it has been found that color removal followed the increasing order: Direct UV photolysis < H2O2/UV
Pyridinium derivatives namely, 4-(dimethylamino)-1-ethylpyridinium bromide (DEB), 4-(dimethylamin... more Pyridinium derivatives namely, 4-(dimethylamino)-1-ethylpyridinium bromide (DEB), 4-(dimethylamino)-1- pentylpyridinium bromide (DPB) synthesised by our group, were tested as inhibitors for the corrosion of mild steel in 1 M HCl using polarisation and electrochemical impedance measurements, Scanning electron microscope (SEM) and Quantum chemical calculations. The results show that the DEB and DPB enhances inhibition at all concentrations. The best protection (94.09%) is obtained by adding DEB at 10-4 M. Polarisation curves show that DEB and DPB acts as a mixed type inhibitor. The degree of the surface coverage of the adsorbed inhibitors is determined by weight loss measurement, and it was found that the adsorption of the two compounds on the mild steel surface obeys the Langmuir adsorption isotherm. The effect of the temperature on the corrosion behaviour with addition of DEB and DPB at various concentrations was studied in the temperature range 303 – 333 K. Results show that the ra...
The acid corrosion inhibition and adsorption process of copper in 2M H3PO4 containing 0.3M of NaC... more The acid corrosion inhibition and adsorption process of copper in 2M H3PO4 containing 0.3M of NaCl by an Ecofriendly ionic liquid newly synthesized [1-(2-(4-chlorophenyl)-2 oxoethyl)Pyridazinium Bromid CPEPB] and [1-(2- (4-nitrophenyl)-2-oxoethyl)Pyridazinium Bromide NPEPB]. Was studied by using weight loss measurements, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization.The presence of these tow molecules led to decrease of the corrosion rate of Copper. At 10-3 M of NPEPB and CPEPB, the inhibition efficiencies increase with the inhibitor concentration to reach 88.94% and 87.5%, respectively. The adsorption of these compounds on Copper surface agrees Langmuir’s adsorption isotherm. To support the experimental results and To perform the corrosion study, Quantum chemical approach, using the density functional theory (DFT), was applied in order to get better understanding about the relationship between the inhibition efficiency and molecular structure of NPEP...
The inhibition effect of 8-(4-chlorophenyl)-3-hydro xy-4,6-dioxo-2-(p-toly)-4,6-dihydropyrimido [... more The inhibition effect of 8-(4-chlorophenyl)-3-hydro xy-4,6-dioxo-2-(p-toly)-4,6-dihydropyrimido [2,1-b] [1,3] thiazine-7-carbonitrile ( HPDTC-1), 3-hydroxy-4,6-dioxo-8-phenyl-2-(p-toly)-4,6-dihyd ropyrimido [2,1-b] [1,3] thiazine-7-carbonitrile ( HPDTC-2) and 3-hydroxy8-(4-nitrophenyl)-4,6-dioxo-2-(p-toly )-4,6-dihydropyrimido [2,1b] [1,3] thiazine-7-carbonitrile ( HPDTC-3) on the corrosion behavior of carbon steel in hydr ochloric solution were investigated by experimentally using polarizat ion, electrochemical impedance spectroscopy and gra vimetric measurements and complementary with density functio nal theory (DFT) methods. The results of this study show that these compounds give excellent inhibiting propertie s for carbon steel corrosion in acidic medium with the efficiency that exceeds 96% for HPDTC-3, 95% for HPDTC-2 and 9 2% for HPDTC-1 at 10 -3 mol/L. Polarization curves prove that these organic compounds act as inhibitors mixe d-type. The adsorption of all studied inhibito...
In this study we have investigated the efficiency of surfactants and ligands on cleaning artifici... more In this study we have investigated the efficiency of surfactants and ligands on cleaning artificially contaminated red, sandy and white chalk soil samples from copper ion. Various concentrations of four different surfactants: Triton, X-100, SDS, Tergitol and Tween 80 were used as washing solution for remediation of contaminated soils. Different concentrations of three different ligands (I-, SCN and EDTA) along with nonionic surfactant, Triton X-100, were applied as soil washing agents to desorb copper from artificially contaminated soils.
Heavy metals are persistent pollutants in the environment. Problems associated with the cleanup o... more Heavy metals are persistent pollutants in the environment. Problems associated with the cleanup of sites contaminated by metals have demonstrated the need to develop remediation technologies that are feasible, quick, and effective in a wide range of physical settings. In this study we have investigated the adsorption of Cu(II), onto red soil in single and multi-element systems as a function of soil and heavy metal concentrations. Before contamination, soils were characterized to determine particle size, pH, organic matter content and heavy metal contents. The results of experimental sorption data fitted very well the Freundlich isotherm model with n = 1.4 and k = 1.25 and first order kinetics model. The best pH for adsorption of Cu 2+ on red soil was found to be 4.0. Adsorption of metals on soil increased in the order Cu > Pb > Zn ≈ Cd. This trend might be related to the increase in the electronegativity of the metal ion.
The development of biobased polymeric materials for wastewater purification has become a demand d... more The development of biobased polymeric materials for wastewater purification has become a demand due to the growing need for water free of hazardous metal ions for safe purposes. The organic components of the OLLW including carbohydrates, phenolics, aromatic acids and others are cost-effective and sustainable choices for this application. This work focuses on a method for turning the organic components of liquid waste from the olive industry (OILW) into a foam-based value-added polymer that has several metal ion binding sites. The process of making the target polymers involved reacting the components of the OILW with hexamethylene diisocyante and 1,4-phnyelene diisocynate to create the polymeric materials LHMIDIC and LPDIC that are in foam forms with urethane linkages, respectively. The adsorption competence of the polymeric foams toward Pb(II) was evaluated as a function of various parameters including adsorbent dose, pH, temperature, initial ion concentration and time. The optimum parameters values that led to a quantitative removal of Pb(II) were identified. The obtained thermodynamic parameters showed that the adsorption by the two foams was spontaneous at room temperature. The isothermal and kinetic values showed that the adsorption by synthesized foams follows a second order kinetic and obeys the Langmuir isothermal model. The foams showed a high tendency for removing multi metal ions present in a real sample of wastewater. The original nature of the starting material used in making the foam, cost and the obtained results showed the potential of using the foam in a large-scale plants of wastewater purification.
The inhibition performance of quercetin for C38 steel in1.0MHCl was evaluated by electrochemical ... more The inhibition performance of quercetin for C38 steel in1.0MHCl was evaluated by electrochemical measurements: impedance spectroscopy and polarization curves tests. Results obtained reveal that the quercetin acts excellently as a corrosion inhibitor for C38 steel in 1.0 M HCl. The inhibition efficiency increases with the concentration of the inhibitor to reach 98.2 % at 2.10-6M of the quercetin. Polarization curves showed that the quercetin behaves as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface obeyed the Langmuir adsorption isotherm. The effect of temperature on the corrosion behavior of carbon steel in 1M HCl was also studied. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. Data obtained from EIS technique, were analyzed to model the corrosion inhibition process through appropriate equivalent circuit model; a constant phase element (CPE) has been used. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated and discussed. Quantum chemical parameters were calculated using ab initio and DFT methods to find a good correlation with the inhibition efficiency. A good agreement was found between the theoretical calculations and experimental observations.
Applied Journal of Environmental Engineering Science, 2016
The influence of Tangeretin (TGT) on the inhibition of corrosion on mild steel in hydrochloric ac... more The influence of Tangeretin (TGT) on the inhibition of corrosion on mild steel in hydrochloric acid has been investigated by weight loss, potentiodynamic polarization, electrochemical impedance (EIS). The result of weight loss study shows that the corrosion inhibition efficiency (IE) is directly proportional to the concentration of the inhibitor. Electrochemical study proved that the inhibitor acts as a mixed type inhibitor. Tested inhibitor adsorb on the steel surface according to Langmuir isotherm. From the adsorption isotherm some thermodynamic data for the adsorption process are calculated and discussed.
The corrosion inhibition efficiency of Sulfapyridine(SFP) for carbon steel in 2.0 M H 3 PO 4 has ... more The corrosion inhibition efficiency of Sulfapyridine(SFP) for carbon steel in 2.0 M H 3 PO 4 has been studied using weight loss, polarization, electrochemical and impedance spectroscopy techniques. The results show that SFP is a good inhibitor in 2.0 M H 3 PO 4. Effects of temperature and acid concentration on inhibitive performance were investigated. Polarization curves reveal that SFP acts as a mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing Sulfapyridine concentration. Activation energy of corrosion and other thermodynamic parameters such as standard free energy, standard enthalpy, and standard entropy of the adsorption process revealed better and well-ordered physical adsorption mechanism in the presence of Sulfapyridine. Adsorption isotherms in absence or presence of SFP as inhibitor appropriately fit the Langmuir isotherm. Theoretical investigations have established that the interaction of SFP with the metal steel surface is mainly through the Nitrogen, oxygen atoms, sulphonyl group and the π system of the aromatic ring.
The inhibition effect of sulfathiazole (STZ) on the corrosion inhibition of mild steel in 1.0 M H... more The inhibition effect of sulfathiazole (STZ) on the corrosion inhibition of mild steel in 1.0 M HCl solution was studied by polarization, EIS, weight loss measurements and quantum chemical calculation. It was found that the inhibitor was effective and the inhibition efficiency was significantly increased with increasing concentration. Polarization curves revealed that the used inhibitor represent mixed-type inhibitor. Adsorption of the inhibitor led to a reduction in the double layer capacitance and an increase in the charge transfer resistance, and was found also to obey Langmuir isotherm. A good correlation between theoretical data and experimental data has been obtained.
The influence of three quinoline derivatives (8QNs) namely, ethyl 2-(((8-hydroxyquinolin-5-yl)met... more The influence of three quinoline derivatives (8QNs) namely, ethyl 2-(((8-hydroxyquinolin-5-yl)methyl)amino)acetate (8QN1), 5-((benzylamino)methyl)quinolin-8-ol (8QN2) and 5-(azidomethyl)quinolin-8-ol (8QN3) on the mild steel corrosion in 1 M HCl was studied by weight loss and electrochemical methods. Results showed that 8QN3 shows maximum inhibition efficiency of 90% at 5×10-3 M concentration. Polarization study revealed that the 8QNs act as mixed type inhibitors. EIS measurements showed that the studied compounds inhibit mild steel corrosion by adsorbing on the steel surface. Results showed that inhibition efficiency increases with concentration. Adsorption of 8QNs on the mild steel surface obeyed the Langmuir adsorption isotherm.
The influence of oil of citrus leaves (OCL) concentration and the effect of medium temperature on... more The influence of oil of citrus leaves (OCL) concentration and the effect of medium temperature on the carbon steel corrosion in aqueous 1.0 M hydrochloric acid was realized experimentally using electrochemical impedance spectroscopy, potentiodynamic polarization curves and gravimetric technique. Results showed that the OCL is the excellent inhibitor for steel corrosion and the polarization curves data revealed that the tested compound acts as a mixed type inhibitor with predominant anodic. The study of temperature effect was investigated and leads to the determination of thermodynamic activation parameters. Electrochemical impedance spectroscopy result exhibit one capacitive loop indicating that, the corrosion reaction is controlled by charge transfer process and the presence of this compound decreases the double layer capacitance and increases the charge transfer resistance. The oil of citrus leaves act by adsorption on the carbon steel surface according to a Langmuir isotherm adsorption model.
Applied Journal of Environmental Engineering Science, 2015
Electrochemical measurements for the corrosion inhibition of mild steel in 1 M hydrochloric acid ... more Electrochemical measurements for the corrosion inhibition of mild steel in 1 M hydrochloric acid by 5, 12-Naphthacenequinone H. Lgaz (a), (b)* , R. Salghi (b) , S. Jodeh (c) , K. Toumiat (d) , M. Larouj (a)
Corrosion inhibition of mild steel in hydrochloric acid by 5,5',5''-(nitrilotris (methylene)) tri... more Corrosion inhibition of mild steel in hydrochloric acid by 5,5',5''-(nitrilotris (methylene)) tris-(8-quinolinol) : Experimental, theoretical and molecular dynamic studies H. Lgaz (a) (b) , R. Salghi (b) * , M. Larouj (a) , M. Elfaydy (c) , S. Jodeh (d) , H. Abbout (a) (c) , B. Lakhrissi (c) , K. Toumiat (e) H. Oudda (a)
Background: Human and veterinary antibiotics are typically discharged as parent chemicals in urin... more Background: Human and veterinary antibiotics are typically discharged as parent chemicals in urine or feces and are known to be released into the environment via wastewater treatment plants (WWTPs). Several research investigations have recently been conducted on the removal and bioremediation of pharmaceutical and personal care products (PPCPs) disposed of in wastewater. Results: SiNP-Cu, a chelating matrix, was produced by delaying and slowing 1.5-dimethyl-1H-pyrazole-3-carbaldehyde on silica gel from functionalized with 3-aminopropyltrimethoxysilane. The prepared sorbent material was characterized using several techniques including BET surface area, FT-IR spectroscopy, Scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and nitrogen adsorption-desorption isotherm. The pseudo-second-order model provided the best correlation due to the big match between the experimental and theoretical of different adsorption coefficients. The Langmuir and Freundlich adsorption models were used and the study showed a better match with the Freundlich model with a capacity of removal reached up to 420 mg g −1. The removal capacity was dependent on pH and increased by increasing pH. The removal percentage reached 91;5% at pH = 8. The adsorbent demonstrated a high percentage removal of TMP, reaching more than 94% when increased pH. The sample was simply regenerated by soaking it for a few minutes in 1 N HCl and drying it. The sorbent was repeated five times with no discernible decrease in removal capacity. The thermodynamic study also showed endothermic, increasing randomness and not spontaneous. The free energy was 2.71 kJ/mol at 320 K. The findings of the DFT B3LYP/6-31 + g (d, p) local reactivity descriptors revealed that nitrogen atoms and π-electrons of the benzene and pyrimidine rings in the TMP are responsible for the adsorption process with the SiNP surface. The negative values of the adsorption energies obtained by molecular dynamic simulation indicated the spontaneity of the adsorption process. Conclusion: The global reactivity indices prove that TMP is stable and it can be removed from wastewater using SiNP surface. The results of the local reactivity indices concluded that the active centers for the adsorption process are the
In this study, evaluation and comparison of the effectiveness of some photochemical systemssuch a... more In this study, evaluation and comparison of the effectiveness of some photochemical systemssuch as direct UV photolysis, H2O2/UV, H2O2/Fe2+(Fenton process)and H2O2/Fe2+/UV (Photo-Fenton process) have been investigated in lab-scale experiments to remove Neutral Red(abbreviated as NR)from aqueous solutions. From the experimental results, it has been found that color removal followed the increasing order: Direct UV photolysis < H2O2/UV
Pyridinium derivatives namely, 4-(dimethylamino)-1-ethylpyridinium bromide (DEB), 4-(dimethylamin... more Pyridinium derivatives namely, 4-(dimethylamino)-1-ethylpyridinium bromide (DEB), 4-(dimethylamino)-1- pentylpyridinium bromide (DPB) synthesised by our group, were tested as inhibitors for the corrosion of mild steel in 1 M HCl using polarisation and electrochemical impedance measurements, Scanning electron microscope (SEM) and Quantum chemical calculations. The results show that the DEB and DPB enhances inhibition at all concentrations. The best protection (94.09%) is obtained by adding DEB at 10-4 M. Polarisation curves show that DEB and DPB acts as a mixed type inhibitor. The degree of the surface coverage of the adsorbed inhibitors is determined by weight loss measurement, and it was found that the adsorption of the two compounds on the mild steel surface obeys the Langmuir adsorption isotherm. The effect of the temperature on the corrosion behaviour with addition of DEB and DPB at various concentrations was studied in the temperature range 303 – 333 K. Results show that the ra...
The acid corrosion inhibition and adsorption process of copper in 2M H3PO4 containing 0.3M of NaC... more The acid corrosion inhibition and adsorption process of copper in 2M H3PO4 containing 0.3M of NaCl by an Ecofriendly ionic liquid newly synthesized [1-(2-(4-chlorophenyl)-2 oxoethyl)Pyridazinium Bromid CPEPB] and [1-(2- (4-nitrophenyl)-2-oxoethyl)Pyridazinium Bromide NPEPB]. Was studied by using weight loss measurements, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization.The presence of these tow molecules led to decrease of the corrosion rate of Copper. At 10-3 M of NPEPB and CPEPB, the inhibition efficiencies increase with the inhibitor concentration to reach 88.94% and 87.5%, respectively. The adsorption of these compounds on Copper surface agrees Langmuir’s adsorption isotherm. To support the experimental results and To perform the corrosion study, Quantum chemical approach, using the density functional theory (DFT), was applied in order to get better understanding about the relationship between the inhibition efficiency and molecular structure of NPEP...
The inhibition effect of 8-(4-chlorophenyl)-3-hydro xy-4,6-dioxo-2-(p-toly)-4,6-dihydropyrimido [... more The inhibition effect of 8-(4-chlorophenyl)-3-hydro xy-4,6-dioxo-2-(p-toly)-4,6-dihydropyrimido [2,1-b] [1,3] thiazine-7-carbonitrile ( HPDTC-1), 3-hydroxy-4,6-dioxo-8-phenyl-2-(p-toly)-4,6-dihyd ropyrimido [2,1-b] [1,3] thiazine-7-carbonitrile ( HPDTC-2) and 3-hydroxy8-(4-nitrophenyl)-4,6-dioxo-2-(p-toly )-4,6-dihydropyrimido [2,1b] [1,3] thiazine-7-carbonitrile ( HPDTC-3) on the corrosion behavior of carbon steel in hydr ochloric solution were investigated by experimentally using polarizat ion, electrochemical impedance spectroscopy and gra vimetric measurements and complementary with density functio nal theory (DFT) methods. The results of this study show that these compounds give excellent inhibiting propertie s for carbon steel corrosion in acidic medium with the efficiency that exceeds 96% for HPDTC-3, 95% for HPDTC-2 and 9 2% for HPDTC-1 at 10 -3 mol/L. Polarization curves prove that these organic compounds act as inhibitors mixe d-type. The adsorption of all studied inhibito...
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