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Rahmani, Atefeh | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42077 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Gholami, Mohammad Reza
Abstract:
Nanosized CdS coupled TiO2 nanocrystals were prepared by a microemulsion-mediated Hydrothermal method at relatively low temperatures. Modification of this nanocomposite with Tyrosine,Phenylalanine,Glysine and Glutamate ,especially Tyrosine resulted in enhanced photocatalytic degradation rate of Nitrobenzene( NB ) compared to using CdS-TiO2 under visible light irradiation. The prepared samples were characterized by BET,SEM, XRD, UV–Vis spectroscopy ,FTIR .It was found which have high surface area about 470 m2 g−1 and mesoporous character with the average pore diameter of 2.8 nm.The results showed this nanocomposite consisted of uniform anatase TiO2 with highly dispersed cubic phase CdS nanocrystals and homogenous structure with relatively small particle 28 nm.Furthermore amino acids modified CdS-TiO2 enhanced the absorption properties in visible light rang and reduced the band gap to 2.62ev. The result indicates that modification of CdS-TiO2 with electron-donating groups is an effective way to enhance photodegredation of nitroaromatic compounds as a toxic and suspected carcinogenic compounds .
Keywords:
Titanium Dioxide ; Amino Acid ; Cadmium Sulfide ; Microemulsion ; Nitrobanzen

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