Document Details
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Document Type |
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Thesis |
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Document Title |
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Enhancement of Photocatalytic Activity of TiO2 Nanoparticles by Doping With (Metal / Non-Metal, and Coupling with Semiconductor) For Photocatalytic Oxidation of Methylene Blue Dye تعزيز النشاط الضوئي للجزيئات النانونية للمحفز TiO2بواسطة تطعيمه بعنصر معدني أو غير معدني أو باقترانه مع اشباه موصلات ثم استخدامه كمحفز ضوئي لأكسدة الصبغة الزرقاء من المثيلين |
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Subject |
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Faculty of Sciences |
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Document Language |
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Arabic |
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Abstract |
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Searching novel techniques to eliminate dyes, and prevent them from perilous emission in the environment, has become highly essential; since there has been a growing demand of textiles that have harmful effects on our ecosystem. The presently used technologies, to reduce the dyes in water, are rather classical, and lack efficiency. This is mainly caused by the significant solubility of dyes; they simply endure chemical and biological degradation. Some innovative ways have been recently introduced to eliminate dyes in industrial water: Advanced oxidation processes (AOPs), such as Semiconductor photo catalysts that have been created lately, to eliminate dyes properly. Among the largely employed semiconductors in photo catalytic processes, TiO2 is one of the most commonly used semiconductors in photocatalytic processes and Sin is characterized by its high surface area. This work focuses on studying the performance of metal- TiO2 nanocomposite, non- metal TiO2 nanocomposite and TiO2- semiconductor coupled systems in adsorption and photo-catalytic degradation for removal of methylene blue in aqueous medium, TiO2 xerogel was prepared by means of sol-gel technique, by adding Titanium(IV) butoxide to Tetrapropylammonium hydroxide, then utilizing such photocatalyst to eliminate methylene blue dye in aqueous mediums under UV irradiation . However, the band gap of TiO2 is large (3.20 eV), wavelengths below 400 nm are necessary for excitation, which represents 5% of the sun light and also the charge carrier recombination of photo-generated electron/hole pairs occurs within nanoseconds leading to low activity in visible light. Thus, it was necessary to better its activities, by transforming absorption threshold from the UV-region to the visible-region, through loading metal, non- metal to change the properties of prepared photocatalysts. metal, non- metal were loaded by application of a photo-assisted sol-gel method. The textural features of prepared photocatalyst were characterized by different techniques such as XRD, BET, TEM, UV-Vis/DR, XPS and fluorescence spectrometer . Finally, the effect of coupled semiconductor on photocatalytic oxidation process of methylene blue dye were studied . Here, we obtain an effective nanoparticles photocatalyst for photo degradation of methylene blue dye in aqueous medium, which would allow us to study the activity of such photocatalyst towards photo degradation of different organic pollutant . |
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Supervisor |
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Prof. Dr. Reda M. Mohamed |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1438 AH
2017 AD |
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Co-Supervisor |
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Dr. Elham S. Baeissa |
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Added Date |
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Tuesday, February 7, 2017 |
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Researchers
| خديجة سعد النمشه | Al- Namshah, Khadijah Saad | Researcher | Doctorate | |
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