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Document Type |
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Thesis |
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Document Title |
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Silver Based 2D and 3D Nanomaterials for Removal of Water Pollutants جسيمات الفضة النانونية المنتشرة على مواد ثنائية وثلاثية الأبعاد لإزالة ملوثات المياه |
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Subject |
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Faculty of Science |
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Document Language |
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Arabic |
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Abstract |
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Silver (Ag) containing nanomaterials was successfully prepared by varying synthesis conditions to understand the influence of preparation conditions on the physicochemical and photocatalytic properties of these materials. The samples (Ag-1 and Ag-2) prepared using AgNO3, NaHCO3, and polyvinylpyrrolidone (PVP) template exhibited pure Ag metal nanorods and nanoparticles. The Ag-3 sample prepared without PVP template and calcined at 250 oC showed the presence of a pure Ag2O phase. However, the same sample dried at 50 oC (Ag-4) showed the presence of a pure Ag2CO3 phase. Interestingly subjecting the sample to hydrothermal treatment (Ag-5) has not resulted in any change in the crystal structure, but particle size was increased. All the synthesized Ag-containing nanomaterials were used as photocatalysts for p-nitrophenol (p-NP) degradation under visible light irradiation. The Ag-4 sample (pure Ag2CO3) exhibited high photocatalytic activity (86.24% efficiency at pH 7, p-NP concentration of 16 mgL-1, 120 min, and catalyst mass of 100 mg) compared to the other synthesized Ag-containing nanomaterials. To overcome drawback of the poor stability of Ag2CO3 in the photocatalytic process, it was deposited on synthesized nanosized H-ZSM-5 (3D) and H-magadiite (2D) supports. Ag2CO3/H-ZSM-5 and Ag2CO3/H-magadiite composites with different Ag2CO3 loadings (5 wt.%, 10 wt.%, and 15 wt.%) are prepared and utilized to remove p-NP under visible light irradiation. The p-NP photocatalytic degradation efficiency increased with the increase of Ag2CO3 loading from 5 wt.% to 10 wt.%, then decreased when loading increased to 15 wt.%. The maximum photocatalytic degradation efficiency (98.26%) occurred in the solution containing 16 mgL-1 p-NP by 100 mgL-1 dosage of 10%Ag2CO3/H-ZSM-5 at pH7 during 100 min under visible light irradiation. The p-NP photocatalytic degradation efficiency increased with the increase of Ag2CO3 loading from 5 wt.% to 15 wt.%. The maximum photocatalytic degradation efficiency (100%) occurred in the solution containing 16 mgL-1 p-NP by 100 mgL-1 dosage of 15%Ag2CO3/H-magadiite at pH 7. The enhanced activity and stability of Ag2CO3 is due to hybridization of Ag2CO3 with H-ZSM-5, and H-magadiite supports.
Keywords: Silver nanomaterials, H-ZSM-5, H-magadiite, Water purification, Photocatalyst, p-Nitrophenol, Degradation |
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Supervisor |
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Prof. Dr. Katabathini Narasimharao |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1445 AH
2023 AD |
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Co-Supervisor |
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Prof. Dr. Abdulmohsen Ali Alshehri |
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Added Date |
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Wednesday, October 25, 2023 |
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Researchers
| سلوى ذياب المعلوي | Al-Malw, Salwa Deyab | Researcher | Doctorate | |
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