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bismuth
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Preparation and Charactrization of Bismuth Vanadate Nanoparticles as a Visible Light Photocatalyst for Degradation of Environmental Pollutants
, M.Sc. Thesis Sharif University of Technology ; Rahman Setayesh, Shahrbanoo (Supervisor) ; Gholami, Mohammad Reza (Supervisor)
Abstract
Bismuth Vanadate (BiVO4) nanoparticles were prepared from two different precursors by precipitation method. The samples were characterized by Fourier transformed infrared (FT-IR), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM) and BET. The photocatalytic activities were examined by degradation of Acid Blue 92 under visible light. The results revealed that all the BiVO4 samples were in a monoclinic phase in nano range. The photocatalytic activity of BiVO4 depend on the calcination temperature and the concentration of photocatalyst. The photocatalytic activity increases with the amount of catalyst loading and decreases with increasing the...
Three Dimensional Dirac Materials in Weak Links
, Ph.D. Dissertation Sharif University of Technology ; Jafari, Akbar (Supervisor)
Abstract
We study the quantum transport properties of three dimensional Dirac materials within the framework of Landauer–Büttiker formalism. Charge carriers in normal metal satisfying the Schrödinger equation, can be split into four-component with appropriate matching conditions at the boundary with the three dimensional Dirac material (3DDM).We calculate the conductance and the Fano factor of an interface separating 3DDM from a normal metal, as well as the conductance through a slab of 3DDM. Under certain circumstances the 3DDM appears transparent to electrons hitting the 3DDM. We find that electrons hitting the metal-3DDM interface from metallic side can enter 3DDM in a reversed spin state as soon...
Production of Fuel from Carbon Dioxide Using Elements Doped on the Photocatalytic Nanoparticles of Titanium Oxide
, M.Sc. Thesis Sharif University of Technology ; Ghotbi, Cyrus (Supervisor) ; Khorasheh, Farhad (Supervisor) ; Larimi, Afsaneh Sadat (Co-Supervisor)
Abstract
Carbon dioxide photocatalytic reduction is one of the promising methods used to produce a wide range of renewable hydrocarbon fuels using sunlight in the presence of photocatalysts. In this study, a series of Nickel and Bismuth doped titanium dioxide samples were synthesized by Sol-gel method. After performing photocatalytic carbon dioxide recovery experiments and finding the optimum percentage of Nickel and Bismuth doped titanium dioxide,Ni and Bi co-doped TiO2 sample showed the highest photocatalytic activity. Amount of methane production was 21.13 μmol/gcat in the presence of co-doped sample that was about 6.5 times higher than the amount of methane produced in the presence of pure TiO2...