Papers by Ghadah M Al-Senani
International journal of biological macromolecules, Jun 1, 2024
International journal of biological macromolecules, Apr 1, 2024
Reactive and functional polymers/Reactive & functional polymers, Apr 1, 2024
Journal of molecular liquids, Apr 1, 2024
International journal of biological macromolecules, Apr 1, 2024
Inorganic chemistry communications/Inorganic chemistry communications (Online), Apr 1, 2024
Ceramics international, Feb 1, 2024
Journal of photochemistry and photobiology. A, Chemistry, Feb 1, 2024
Nanomaterials, Oct 18, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
ACS Omega, 2017
Cellulose nanocrystal (CNC)-reinforced poly-(lactic acid) (PLA) nanocomposites were prepared by t... more Cellulose nanocrystal (CNC)-reinforced poly-(lactic acid) (PLA) nanocomposites were prepared by twinscrew extrusion followed by injection-molding using a masterbatch approach. Noncovalent modification of CNCs was performed with two different poly(L-lactide) (PLLA)based surfactants to improve the filler/matrix compatibility. They both have a PLLA block that is expected to improve the compatibility with the PLA matrix and differ by the polar head. It consists of either a poly(ethylene glycol) (PEG) block (PEG-b-PLLA) or an imidazolium group (Im-PLLA), that is able to interact with the surface of the CNCs. The morphological, structural, thermal, rheological, and mechanical properties of the nanocomposites were investigated. The different modes of interaction of the polar head of the surfactant lead to different properties. However, the global decrease in the molecular weight of PLA, induced by the short PLLA blocks from the surfactants and the possible degradation during melt processing, results in a plasticization effect and impacts the crystallization of the matrix.
International journal of biological macromolecules, Jun 1, 2024
International Journal of Environmental Analytical Chemistry
Corrosion, Feb 1, 2000
Corrosion inhibition of steel in phosphoric acid (H 3 PO 4) by thiosemicarbazide derivatives was ... more Corrosion inhibition of steel in phosphoric acid (H 3 PO 4) by thiosemicarbazide derivatives was studied using different chemical and electrochemical techniques. Protection efficiency up to 99% was obtained with small amounts (10-4 M) of cinnamaldehyde thiosemicarbazone (CTSCN). The order of increasing inhibition efficiency was correlated with the modification of the molecular structure of the inhibitors. Empirical kinetic relationship was obtained describing the experimental data obtained from the different compounds used in this investigation. Potentiodynamic polarization curves indicated that the compounds acted primarily as mixed-type inhibitors. Electrochemical impedance spectroscopy showed that the charge-transfer resistance increased and the capacitance of the double layer decreased with increasing the concentration of the inhibitor in the medium, confirming adsorption process mechanism. At high concentrations (> 10 4 M), the capacitance of the double layer leveled off since maximum double-layer thickness was attained. Kinetic-thermodynamic model and Flory-Huggins adsorption isotherm described the experimental findings. Number of active sites, binding constant, and change of free energy were computed for all inhibitors studied. Based on the inhibitor, it was found that each organic molecule replaced one or more adsorbed water molecule from the steel surface. The influence of exposure time on the performance of crotonaldehyde thiosemicarbazone (CrTSCN) was studied. Results showed that the inhibitor performed better with time and at a critical concentration of 5 x 10-4 M. Maximum protection efficiency was attained because of a strong adsorption on steel surface over the total period of immersion exceeding 30 h.
International Journal of Electrochemical Science, 2016
American Journal of Applied Sciences, Sep 1, 2014
Removal of dyes from wastewater is important for industry and environmental protection. The adsor... more Removal of dyes from wastewater is important for industry and environmental protection. The adsorption technique, using biomass is attractive method for environmental and economical reasons. This study studies removal of Congo Red dye (CR) from aqueous solutions by adsorption using date palm Leaf Base (LB). The adsorption of congo red dye CR onto LB has been examined in aqueous solution by considering the influence of temperature up to 60°C and pH on the percentage removal of CR. The results showed that the percentage removal of CR increased with increasing temperature and decreased with increasing pH. The Langmuir and Freundlich models have been applied to describe the equilibrium data and the thermodynamic parameters, Gibbs free energy ∆G°, enthalpy change ∆H° and entropy ∆S°, have been determined. The negative value of ∆H suggests that adsorption of CR by the date palm leaf base is exothermic. The positive values of ∆G° at all studied temperatures indicate that CR adsorption is a unspontaneous process. LB is a promising adsorbent for the removal of CR from aqueous solution over a range of concentrations.
Adsorption Science & Technology, Apr 1, 2000
The corrosion inhibition of steel in phosphoric acid by thiosemicarbazide derivatives has been st... more The corrosion inhibition of steel in phosphoric acid by thiosemicarbazide derivatives has been studied using different chemical and electrochemical techniques. The observed order of increasing inhibition efficiency was correlated with changes in the molecular structures of the inhibitors. Potentiodynamic polarization curves indicate that the compounds are mixed-type inhibitors. Electrochemical impedance spectroscopy has been used successfully to evaluate the performance of the inhibitors. AC measurements showed that the dissolution process was activation-controlled. The kinetic–thermodynamic model and the Flory–Huggins adsorption isotherm described the experimental findings well. The number of active sites, binding constant and change in free energy were computed for all the inhibitors studied. It was found that the inhibitor molecule was adsorbed through more than one active centre and occupied more than one active site on the steel surface.
Materials, Feb 17, 2020
This paper studies the use of zinc oxide nanoparticles (ZnO-NPs) synthesized using an extract of ... more This paper studies the use of zinc oxide nanoparticles (ZnO-NPs) synthesized using an extract of Convolvulus arvensis leaf and expired ZnCl 2 , as efficient inhibitors of carbon steel corrosion in a 1 M HCl solution. The synthesized ZnO-NPs were characterized by Fourier-transform infrared (FTIR) and UV-Vis spectroscopy analysis. The corrosion inhibition of carbon steel in 1 M HCl was also investigated through potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and the determination of weight loss. The results show that the efficiency of the prevention increased when the concentration of ZnO-NPs was increased to 91%, and that the inhibition efficiency was still high (more than 89%) despite decreasing at high temperatures, acting as a mixed-type inhibitor. A sample of carbon steel with a protective layer of inhibitor on top was observed during immersion in 1 M HCl for 20 h; an increase in the charge transfer resistance (R ct) and stability of the inhibitor could be observed after 6 h. Adsorption isotherm models demonstrated that the inhibitor adsorption mechanism on the carbon steel surface followed Langmuir rather than Freundlich and Temkin behaviors. The thermodynamic parameters showed that the adsorption process is one of mixed, spontaneous, and exothermic adsorption. The results illustrate that the ZnO-NPs were a strong inhibitor of carbon steel corrosion in acid medium. The results of scanning electron microscopy (SEM) images showed that the ZnO-NPs formed a good protective film on the carbon steel surface.
International Journal of Electrochemical Science, Apr 1, 2018
In this study, extracts of both treated and untreated date palm tree waste were used as inhibitor... more In this study, extracts of both treated and untreated date palm tree waste were used as inhibitors of carbon steel corrosion in 1 M HCl. The date palm wastes used were the fiber and leaflets of the plant, and the treatment process involved gum arabic solution. The electrochemical measurements showed that the extracts were efficient inhibitors. The treated wastes were more efficient inhibitors than untreated waste, and the leaflets were better inhibitors than the fibers. The effect of temperature on inhibition efficiency, thermodynamic parameters, and adsorption isotherms for the treated inhibitors were studied. It was found that the adsorption was endothermic, occurred spontaneously, and that the adsorption data fit Langmuir isotherm model.
This paper studies the use of zinc oxide nanoparticles (ZnO-NPs) synthesized using an extract of ... more This paper studies the use of zinc oxide nanoparticles (ZnO-NPs) synthesized using an extract of convolvulus leaves and expired ZnCl2, as an efficient inhibitor for carbon steel corrosion in 1M HCl solution. ZnO-NPs are characterized by Fourier-transform infrared spectrophotometer (FTIR) and UV-Vis analysis. The technique of weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) has also been used to investigate the prevention of carbon steel corrosion in 1M HCl. The results showed that the efficiency of restraint increased when the concentration of ZnO-NPs was raised to 91% and that the inhibition efficiency is still high despite its decrease at high temperature, and it acts as a mixed-type inhibitor A sample of carbon steel with the protective inhibitor layer on top was immersed for 20 hours and observed; an increase in the charge transfer resistance (Rct) and stability of the inhibitor was noticed after 6 hours. Adsorption isotherm models demonstrated that the inhibitor adsorption mechanism on the carbon steel surface followed Langmuir, more than Freundlich and Temkin, behavior. The thermodynamic parameters showed that the adsorption process is a mixed adsorption, spontaneous, and exothermic. The results illustrated that the acid medium was a strong inhibitor of carbon steel corrosion. Scanning electron microscope (SEM) showed that the ZnO-NPs formed a good protective film on the carbon steel surface.
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Papers by Ghadah M Al-Senani