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Production and Characterization of p-n Junction TiO2-NiO Nanocomposite in Order to Improve the Photocatalytic Efficiency

Bakhtiarnia, Siavash | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49257 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhaad, Khatiboleslam
  7. Abstract:
  8. Solar energy is one of the man's solutions to cope with problems involved in exhaustible fossil resources. In this regard, using photocatalysts is a practical and rational pproach.Nanotechnology facilitates using catalysts and photocatalysts with more productivity.TiO2 semiconductor is one of the most popular material in this field but its efficiency is low by several factors such as being inactive in visible light, recombination and the high cost of using noble metals. In this research, we tried to fix these limitations by creating a p-n junction TiO2 - NiO nanocomposite. The samples are made by three methods: impregnation, ultrasonic assisted modified impregnation with ammonium hydroxide treatment, and microwave assisted synthesis of in-situ nanocomposite including Graphene, which showed very good properties.XRD, BET, FESEM, FTIR, RAMAN, DRS, UV-Vis, AAS, DSC, TGA and photocatalytic activity analysis were done as characterization. The result of the experiments confirmed the formation of nanosized intended phases, and increasing the absorption of semiconductors in visible region in presence of Nickle oxide.The sample containing of 1% Nickle created by ultrasonic assisted modified impregnation method showed the most activity among other Nickle containing samples. In addition, the sample containing Graphene with the highest BET surface showed the best photocatalytic activity among other rivals. TiO2 – NiTiO3 nanocomposite is very promising due to the high activity in both visible and UV light
  9. Keywords:
  10. Titanium Dioxide ; Nickle Oxide ; Nanotechnology ; Methylene Blue ; Graphene ; Photocatalyst ; Nanotechnology ; Nanoparticle Synthesis

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