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ABSTRACT
Tin oxide (SnO₂) is an n-type semiconductor with excellent optical and electrical properties, partly due to its wide band gap (Eg = 3.6 eV, at 300 K). Therefore, it is an important semiconductor material and it has been widely used as gas sensors, solar cells, lithium battery anode materials, catalysts and so on. So far, few literatures have reported for SnO₂ as a photocatalyst that was used to degrade dye contaminants [1-3]. High purity SnO₂ nanoparticles were succefully prepared via a solvothermal process. Hence, in our present investigation, Al-MCM-41 was used as the solid acid catalyst. Mesoporous Al-MCM-41 molecular sieves in the Si/Al ratios 25, 75, 100 and 150 were synthesized under hydrothermal condition also SnO₂ nanoparticles were coated on Al-MCM-41 mesoporous. Figure 1 shows typical TEM image of SnO₂/ Al - MCM-41 composite. The photocatalytic activity of the as-prepared SnO₂ loaded on Al-MCM-41was evaluated by degradation of the methylene blue under irradiation of UV and visible light. The results showed that SnO₂ loaded on nanosize Al-MCM-41 has higher photocatalytic activity than that of SnO₂ nanoparticles. The enhanced photocatalytic activity is attributed to the strong interaction between SnO₂/TiO₂ and Al-MCM-41 which inhibits the recombination of photo-generated charge carriers, and the formation of highly active species •OH on the surface of Al-MCM-41 .
ISLAMIC AZAD UNIVERSITY
Shahrood Branch
Faculty of Science- Department of Chemistry
» M.Sc «Thesis
On physical Chemistry
Subject:
Use of SnO₂/Al- MCM-41 mesoporous under UV and visible light irradiation for the degradation of methylen blue dye
Thesis Advisor:
Majid Mozaffari Ph.D.
Consulting Advisor:
Jafar Aboli Ph.D.
By: