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Document Type |
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Thesis |
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Document Title |
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Preparation and characterization of titanium and vanadium impeded silicates تحضير وتوصيف السيليكات المحملة بكل من التيتانيوم والفاناديوم |
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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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New Titanosilicates of various framework topologies were synthesized using TEAOH template. This Ivanyukite (Na2[Ti4O2(OH)2(SiO4)3]•6H2O) and Sitinakite (H4.04Na1.64O8.84SiTi2 ) zeolites were synthesized hydrothermally. Various conditions were investigated (i.e. temperature, aging time and alkalinity), and the success was examined by using XRD, IR and SEM technologies. Due to the large effect of dyes on pollution and their toxicity, Malachite green dyes were used .The photocatalytic effect of the prepared zeolites were studied in the decomposition of dye, and it was found with high catalytic activity may approach 96%.
Moreover, Ti-zorite phase (ETS-4) was prepated hydrothermally and then examined as a photocatalyst for degradation of malachite green dye. Incorporation of V into framework of ETS-4 was performed in different Ti:V mole ratio within the same preparation conditions. XRD, UV. Visible diffuse reflectance, IR, SEM, and EDX analysis were used to characterize the prepared zeolites. In addition, Photo catalytic degradation of malachite green was chosen as a model reaction to examine the prepared zeolites. The results showed that the pure phase of ETS-4 was attained as only pure phase. Incorporation of V increases the crystallinity of ETS-4 phase reaches maximum crystallinity at 50% V after which crystallinity decreases again reaches null at 80-100% V samples. SEM and EDX analysis in addition to XRD lattice analysis proved the successful incorporation of V into the framework of zeolite matrix. More than one evidence were arisen that both vanadium and titanium active centers was responsible for photo catalytic degradation. A correlation between the structure and surface titanium active centers were put to elucidate the photo catalytic activity. Three dimensional synergism function was written, finding that, maximum synergism was attained at 5-20 min at 50-70 % V. |
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Supervisor |
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Dr. Islam Hamdy Abdelmaqsood Prof. |
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Thesis Type |
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Doctorate 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. Samia Abdulhammed Kosa |
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Added Date |
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Monday, July 29, 2019 |
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Researchers
| دعاء فوزي باعامر | Baamer, Doaa Fouzi | Researcher | Doctorate | |
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