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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 50863 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Ghorbani, Mohammad; Mohammadi, Mohammad Reza
- Abstract:
- Nowadays, heterogeneous photocatalytic processes have attained a particular importance among the other advanced oxidation processes in purification of organic polluted wastewaters. Titanium oxide is the most popular photocatalyst because of its strong oxidizing abilities for decomposition of organic pollutants, superhydrophilicity, chemical stability, long durability, non-toxic nature, and low cost. Same as other semiconductors, high recombination rate of charge carriers is the main weakness that cause decreases in photocatalytic efficiency. One of the solutions is coupling this material with other semiconductors. Core-shell nanoparticles are the type of these composites that show high photocatalyctic activities. In this study, titanium oxide-tin oxide core-shell nanoparticles were synthesized using two stage water base sol-gel process, and it’s characteristics were compared with pure titanium oxide and tin oxide. XRD, FESEM, TEM, PL and DRS tests were carried out for characterization of the samples and confirmation of core-shell structure formation. The methylene blue photocatalytic decomposition under UV light in presence of the core shell synthesized samples demonstrated an increase in comparison of pure TiO2. The results demonstrated that to achieve the highest photocatalytic activity there is an optimum molar ratio between titanium ions and tin ions in the primary core-shell preparation solution, belonging to TS4 sample (1:1 Ti to Sn molar ratio). The TEM images confirmed the formation of tin oxide shell with thickness of around 4 nm over the titanium oxide core with diameters of around 11-25 nm. The X-ray diffraction of the samples specified constituent phase of the core and shell was anatase and cassiterite, respectively. photocatalytic experiments revealed photocatalyst reaction rate constant and percentage of final decomposition of dye for the TS4 sample 30% and 15% respectively, are more than same parameters for titanium oxide nanoparticles
- Keywords:
- Methylene Blue ; Core-Shell Nanoparticle ; Titanium Oxide ; Tin Oxide ; Photocatalyst ; Heterogeneous Catalysis ; Advanced Oxidation Process
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