Mohamed Gado - Academia.edu (original) (raw)
Papers by Mohamed Gado
Journal of materials research and technology, 2023
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International Journal of Environmental Science and Technology, Aug 25, 2022
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International Journal of Environmental Analytical Chemistry, Oct 24, 2019
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Radiochimica Acta, Jul 19, 2021
A chelating matrix prepared by immobilizing N-hydroxyl amine onto graphene oxide functionalized w... more A chelating matrix prepared by immobilizing N-hydroxyl amine onto graphene oxide functionalized with aspartic acid (GO-HDX) was applied to recover UO2 2+ from their SO4 2− leach liquor. SEM-EDAX, FT-IR, TGA, and XRD instruments, in addition, Raman spectroscopy (IR-Raman), were used to analyze the synthesized GO-HDX. The static extraction technique optimized various physicochemical parameters that impacted the UO2 2+ extraction. The optimal pH, time of contact, initial concentration, GO-HDX dose, temp., foreign ions, and eluting agents were gained. The experimental equilibrium documents were assessed using Langmuir and Freundlich equations. The Langmuir equation model quite fits the investigational adsorption data with a maximum uptake of 277.78 mg/g, and it implied the attending of monolayer coverage of adsorbed molecules. Pseudo-first- and pseudo-second-order analyses were done to inspect the kinetic results. The data indicated that pseudo-second-order kinetics fit all concentrations. The intended thermodynamic factors were ∆G° negative values and ∆H° positive value. The data signified that the UO2 2+ extraction onto GO-HDX was spontaneous adsorption and endothermic at higher temperatures. The regeneration efficiency of GO-HDX was 98% using 1 M HCl.
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International Journal of Molecular Sciences, Aug 4, 2022
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Materials
The significant increase in lithium batteries consumption produces a significant quantity of disc... more The significant increase in lithium batteries consumption produces a significant quantity of discarded lithium-ion batteries (LIBs). On the one hand, the shortage of high-grade ores leads to the necessity of processing low-grade ores, which contain a low percentage of valuable metals in comparison to the discarded LIBs that contain a high percentage of these metals, which enhances the processing of the discarded LIBs. On the other hand, the processing of discarded LIBs reduces the negative environmental effects that result from their storage and the harmful elements contained in their composition. Hence, the current study aims at developing cost-effective and ecofriendly technology for cobalt and lithium metal ion recovery based on discarded LIBs. A novel synthesized solid-phase adsorbent (TZAB) was utilized for the selective removal of cobalt from synthetic solutions and spent LIBs. The synthesized TZAB adsorbent was characterized by using 13C-NMR, GC-MS, FT-IR, 1H-NMR, and TGA. Th...
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Journal of Materials Research and Technology
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International Journal of Environmental Science and Technology
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Zeitschrift für anorganische und allgemeine Chemie, 2021
The ferruginous shale iron content (27.5 %) is a serious problem that prevents the separation of ... more The ferruginous shale iron content (27.5 %) is a serious problem that prevents the separation of uranium. Chemical dissolution of the ferruginous shale from Um Bogma Formation, Egypt, has been studied for the recovery of uranium using the acidic leaching method. Um Bogma representative sample assays 700 ppm of uranium as the element of interest. The effective dissolution parameters such as acid concentrations, solid/liquid addition ratio, leaching time, and leaching temperature were planned to investigate. It was found that The dissolution rate was greatly influenced by the studied dissolution factors. Analysis of the kinetic data showed that the dissolution mechanism is fitted well to shrinking core model within chemical reaction as a rate determining step. It was found that the recorded activation energy (Ea) of uranium dissolution is 205 kJ/mol. The uranium dissolution efficiency of 95.2 % has been achieved with optimized conditions of 250 g/L H2SO4; 1 : 7 (S/L) phase ratio; 250 ...
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International Journal of Environmental Analytical Chemistry, 2021
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International Journal of Environmental Analytical Chemistry, 2021
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Journal of Environmental Chemical Engineering, 2021
ABSTRACT One-pot synthesis of N2,N2,N6,N6-tetrakis(2-ethylhexyl)pyridine-2,6-dicarboxamide (EHPyC... more ABSTRACT One-pot synthesis of N2,N2,N6,N6-tetrakis(2-ethylhexyl)pyridine-2,6-dicarboxamide (EHPyCA ligand) was done by condensation of pyridine-2,6-dicarboxylic acid and di- (2-ethyl-hexyl) amine using polyphosphoric acid (PPA) as catalyst. The EHPyCA ligand was impregnated on Amberlite XAD-7 to form a chelating EHPyCA-AXAD-7 resin that runs for U6+ ions sorption from G.Gattar leachate solution, North Eastern Desert, Egypt. Experimental measurement parameters were optimized by a batch technique such as contact time, initial U6+ ions concentration, EHPyCA-AXAD-7 dose, pH, interfering ions, and temperature. The maximum uptake of EHPyCA-AXAD-7 ligand was 76.92 mg.g-1 at pH 7. From the gained result, adsorption equilibrium followed well with the Langmuir isotherm model. The thermodynamic parameters (ΔS°, ΔH°, and ΔG°) were also assessed, and they elaborated that the adsorption process was endothermic and spontaneous in nature. The kinetic study clarified that the U6+ ions adsorption on EHPyCA-AXAD-7 obeyed the pseudo-first-order kinetic mechanism. U6+ ions were completely eluted from the loaded EHPyCA-AXAD-7 using 2 M H2SO4. Finally, the optimized parameters were applied for U6+ ions recovery from G.Gattar leachate to prepare sodium diuranate concentrate (Na2U2O7) with a uranium content of 69.88%.
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International Journal of Environmental Analytical Chemistry, 2019
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Euro-Mediterranean Journal for Environmental Integration, 2018
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Journal of materials research and technology, 2023
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International Journal of Environmental Science and Technology, Aug 25, 2022
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International Journal of Environmental Analytical Chemistry, Oct 24, 2019
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Radiochimica Acta, Jul 19, 2021
A chelating matrix prepared by immobilizing N-hydroxyl amine onto graphene oxide functionalized w... more A chelating matrix prepared by immobilizing N-hydroxyl amine onto graphene oxide functionalized with aspartic acid (GO-HDX) was applied to recover UO2 2+ from their SO4 2− leach liquor. SEM-EDAX, FT-IR, TGA, and XRD instruments, in addition, Raman spectroscopy (IR-Raman), were used to analyze the synthesized GO-HDX. The static extraction technique optimized various physicochemical parameters that impacted the UO2 2+ extraction. The optimal pH, time of contact, initial concentration, GO-HDX dose, temp., foreign ions, and eluting agents were gained. The experimental equilibrium documents were assessed using Langmuir and Freundlich equations. The Langmuir equation model quite fits the investigational adsorption data with a maximum uptake of 277.78 mg/g, and it implied the attending of monolayer coverage of adsorbed molecules. Pseudo-first- and pseudo-second-order analyses were done to inspect the kinetic results. The data indicated that pseudo-second-order kinetics fit all concentrations. The intended thermodynamic factors were ∆G° negative values and ∆H° positive value. The data signified that the UO2 2+ extraction onto GO-HDX was spontaneous adsorption and endothermic at higher temperatures. The regeneration efficiency of GO-HDX was 98% using 1 M HCl.
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International Journal of Molecular Sciences, Aug 4, 2022
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Materials
The significant increase in lithium batteries consumption produces a significant quantity of disc... more The significant increase in lithium batteries consumption produces a significant quantity of discarded lithium-ion batteries (LIBs). On the one hand, the shortage of high-grade ores leads to the necessity of processing low-grade ores, which contain a low percentage of valuable metals in comparison to the discarded LIBs that contain a high percentage of these metals, which enhances the processing of the discarded LIBs. On the other hand, the processing of discarded LIBs reduces the negative environmental effects that result from their storage and the harmful elements contained in their composition. Hence, the current study aims at developing cost-effective and ecofriendly technology for cobalt and lithium metal ion recovery based on discarded LIBs. A novel synthesized solid-phase adsorbent (TZAB) was utilized for the selective removal of cobalt from synthetic solutions and spent LIBs. The synthesized TZAB adsorbent was characterized by using 13C-NMR, GC-MS, FT-IR, 1H-NMR, and TGA. Th...
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Journal of Materials Research and Technology
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International Journal of Environmental Science and Technology
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Zeitschrift für anorganische und allgemeine Chemie, 2021
The ferruginous shale iron content (27.5 %) is a serious problem that prevents the separation of ... more The ferruginous shale iron content (27.5 %) is a serious problem that prevents the separation of uranium. Chemical dissolution of the ferruginous shale from Um Bogma Formation, Egypt, has been studied for the recovery of uranium using the acidic leaching method. Um Bogma representative sample assays 700 ppm of uranium as the element of interest. The effective dissolution parameters such as acid concentrations, solid/liquid addition ratio, leaching time, and leaching temperature were planned to investigate. It was found that The dissolution rate was greatly influenced by the studied dissolution factors. Analysis of the kinetic data showed that the dissolution mechanism is fitted well to shrinking core model within chemical reaction as a rate determining step. It was found that the recorded activation energy (Ea) of uranium dissolution is 205 kJ/mol. The uranium dissolution efficiency of 95.2 % has been achieved with optimized conditions of 250 g/L H2SO4; 1 : 7 (S/L) phase ratio; 250 ...
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International Journal of Environmental Analytical Chemistry, 2021
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International Journal of Environmental Analytical Chemistry, 2021
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Journal of Environmental Chemical Engineering, 2021
ABSTRACT One-pot synthesis of N2,N2,N6,N6-tetrakis(2-ethylhexyl)pyridine-2,6-dicarboxamide (EHPyC... more ABSTRACT One-pot synthesis of N2,N2,N6,N6-tetrakis(2-ethylhexyl)pyridine-2,6-dicarboxamide (EHPyCA ligand) was done by condensation of pyridine-2,6-dicarboxylic acid and di- (2-ethyl-hexyl) amine using polyphosphoric acid (PPA) as catalyst. The EHPyCA ligand was impregnated on Amberlite XAD-7 to form a chelating EHPyCA-AXAD-7 resin that runs for U6+ ions sorption from G.Gattar leachate solution, North Eastern Desert, Egypt. Experimental measurement parameters were optimized by a batch technique such as contact time, initial U6+ ions concentration, EHPyCA-AXAD-7 dose, pH, interfering ions, and temperature. The maximum uptake of EHPyCA-AXAD-7 ligand was 76.92 mg.g-1 at pH 7. From the gained result, adsorption equilibrium followed well with the Langmuir isotherm model. The thermodynamic parameters (ΔS°, ΔH°, and ΔG°) were also assessed, and they elaborated that the adsorption process was endothermic and spontaneous in nature. The kinetic study clarified that the U6+ ions adsorption on EHPyCA-AXAD-7 obeyed the pseudo-first-order kinetic mechanism. U6+ ions were completely eluted from the loaded EHPyCA-AXAD-7 using 2 M H2SO4. Finally, the optimized parameters were applied for U6+ ions recovery from G.Gattar leachate to prepare sodium diuranate concentrate (Na2U2O7) with a uranium content of 69.88%.
Bookmarks Related papers MentionsView impact
International Journal of Environmental Analytical Chemistry, 2019
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Euro-Mediterranean Journal for Environmental Integration, 2018
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