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- 저자 : Asma M. Elsharif (검색결과 2 건)
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Asma M. Elsharif,Ismail Abdulazeez,Monerah A. Almarzooq,Shamsuddeen A. Haladu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
In this study, three new non-ionic surfactants containing more than one active site and their nanohybrid’sderivatives were characterized and synthesized as effective corrosion inhibitors against steel using a newenvironmentally friendly protocol synthesis and traditional methods. All the newly prepared non-ionicsurfactants were confirmed by Fourier infrared (FTIR), NMR spectroscopy, and elemental analysis. Furthermore, the formation of the prepared nanoparticles and nanohybrid silver nanoparticles (HPDS,HPDO, and HPDE) were confirmed using ultraviolet–visible (UV–vis) spectroscopy. Scanning electronmicroscopy (SEM) was also used to characterize AgNPs and nanohybrid’s derivatives (HPDS, HPDO,and HPDE). The molecules exhibited excellent corrosion inhibitive performance in the acid medium withthe nanohybrid’s molecules achieving 98.8, 93.7, and 99.9 % at 200 ppm, for LANH, OANH, and SANH,respectively. The nanohybrid’s inhibitors described in this paper show better efficacy than the inhibitorsmentioned in the previous papers because they achieved a very excellent inhibition efficiency of up to99.9 % by environmentally friendly methods and at the lowest possible cost. In addition, it has the advantagethat it is compatible with many complex mixtures because it remains neutral in aqueous solutions,which makes it good at inhibiting corrosion of steel in acidic medium and important in oil and gas industry. The molecules were found to exhibit chemisorption on mild steel surface in acid media and fit theLangmuir adsorption isotherms with free energies of adsorption of 38.79, 36.52, and 38.46 kJ/molfor the LANH, OANH, and SANH, respectively. Similarly, the molecular level adsorption studies derivedfrom density functional theory resulted in theoretical adsorption energies of 364.7, 385.6, and427.9 kcal/mol for the nanohybrid’s molecules, indicating the strong adsorption and consequentlyhigher suppression of mild steel corrosion by the compounds.
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Ahmed H. Elged,Samy M. Shaban,M.M. Eluskkary,I. Aiad,E.A. Soliman,Asma M. Elsharif,김동환 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In this study, three anionic-cationic zwitterionic Gemini surfactants containing three differenthydrophobic tails were prepared and their chemical structures were confirmed by Fourier transforminfrared (FTIR) and 1H nuclear magnetic resonance (NMR) spectroscopy. The hydrophobic tail of thesynthesized phospho-zwitterionic Gemini surfactants significantly affected the morphological structureof silver nanoparticles (AgNPs) prepared using a photochemical reduction method, which utilizedsunlight as a surplus source of a reducing agent. Increasing the hydrophobic tail length of the surfactantpromoted the formation of AgNPs exhibiting smaller particle sizes with a uniform structure. Moreover, asconfirmed by ultraviolet-visible (UV-Vis) spectroscopy, dynamic light scattering (DLS), and transmissionelectron microscopy (TEM), these AgNPs displayed higher stability in solution than those synthesized inthe presence of Gemini surfactants with a shorter hydrocarbon tail. The impact of tail variation on thecatalytic and antimicrobial performance of AgNPs was also examined. The synthesized surfactant/AgNPsystems showed remarkable catalytic activity in the removal of certain toxic pollutants, including paranitrophenol(p-NP) and methylene blue (MB), which were converted into less toxic compounds in thepresence of NaBH4. Notably, the surfactant exhibiting the longest chain hydrocarbon, i.e., ZGH, producedAgNPs with the highest catalytic activity. This is thefirst study concerning the effects of the surfactant tailon the catalytic activity of NPs. The good biological performance of the synthesized Gemini surfactantsagainst sulfate-reducing bacteria (SRB) demonstrated their potential for application in mitigating thegrowth of SRB during petroleum treatment processes. The combination of the synthesized surfactantswith AgNPs significantly enhanced their biological performance.
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