Document Details
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Document Type |
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Thesis |
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Document Title |
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CONTROLLED SYNTHESIS, CHARACTERIZATION AND ELECTRICAL PROPERTIES OF CRYSTAL PHASE TIO2 NANOPHOTOCATALYST FOR WATER TREATMENT التحكم في تشكيل البنية البلورية للمحفزات الضوئية TiO2 النانوية ,وتوصيفها ودراسة خصائصها الكهربائية لتنقية 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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In recent years, photocatalysis has been gained extensive attention, which is considered a favorable technology from a friendly chemistry point of view for water purification. In water treatment, TiO2 is the most excessively used as photocatalyst for the degeneration of pollutants because it is non-toxic, highly chemical active in numerous reactions and relatively inexpensive. Since the crystal phase of TiO2 plays the main role in affecting the properties of photocatalytic activity, thus phase control is important for several applications. Hence, in this study, synthesis phase structure of TiO2 nanoparticles was successfully controlled by a microwave assisted sol-gel method at low temperature that is considered to be low cost, an eco-friendly and efficient method that is having a potential for large-scale synthesis. The structural and morphological properties of the samples were studied through X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The chemical group functions of synthesized samples were investigated using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) was used to scan the thermal stability, band gap has been estimated using ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS), and the chemical analysis was performed via X-Ray photoelectron spectroscopy (XPS) technique. In addition, the electrical conductivities were investigated. Moreover, the photocatalytic degradation of synthesized sample was evaluated with crystal violet, methylene blue and green malachite solutions under UV light irradiation to investigate the effect of the physicochemical properties. XRD, results showed nanoparticle with a size range of 15 -70 nm. Also, it revealed the different crystalline phases ratio of anatase and rutile, since; the ratio of rutile increases as the precursor increases. SEM, TEM and FTIR confirmed the XRD results. The calculated band gap from electrical conductivity was in agreement with those estimated by DRS measurements. The photocatalytic activity of samples was found to depend on the crystalline phase and structure of organic dye. |
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Supervisor |
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Prof. Faten Alhazmi |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1440 AH
2019 AD |
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Co-Supervisor |
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Dr. Reem Alwafi |
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Added Date |
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Monday, March 4, 2019 |
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Researchers
| كريمه طويلع المشهوري | Al- mashhory, Karima Twila | Researcher | Master | |
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