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The Doped of Nano-photocatalyst and the Study of Its Character

Author: YangLu
Tutor: LiuPeng
School: Wuhan University of Technology
Course: Applied Chemistry
Keywords: Titanium dioxide Synthesis Doping Photocatalytic Antibacterial UV Visible light
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 179
Quote: 1
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Abstract


Ti02 photocatalytic materials with high activity, low price and stable nature characteristics has become a 21st century environmental purification, water treatment and other aspects of the development and application of valuable materials. But the band gap of about 3.2eV, anatase type titanium dioxide having a higher activity has been very limited so that the active titanium dioxide in the practical application. Further, since the synthesis of titanium dioxide excited by light generated by a high electron and hole recombine rate, so that the photocatalytic efficiency of the contaminated substance is not high (quantum yield). Improve Ti02 photocatalytic efficiency and light response range of methods and means a lot of major semiconductor compound, dye-sensitized, noble metal deposition, ion doped and codoped. As a result, the synthesis of different doped titanium dioxide photocatalytic materials through various methods, some of the analytical tools to evaluate the physical and chemical properties of doped titania. The specific content and the results are as follows: (1) hydrolysis of titanium alkoxide and sol - gel synthesis of pure titanium dioxide and doped titanium dioxide, and study the amount of water added to gel formation. The amount of water added to the titanium alkoxide hydrolysis and the formation of gel studied by orthogonal experiment method to determine the optimal ratio of the gel - gel synthesis of nano-Ti02 photocatalytic materials for the the: M Tetrabutoxide: M ethanol: glacial acetic acid: M deionized water = 1:18:2:3.5, (molar ratio), and butyl titanate hydrolysis conditions determined in the same way. (2) prepared by the hydrolysis of titanium alkoxide series of Nd and I doped Ti02 photocatalytic materials, Nd and I doped titanium dioxide photocatalytic material physical properties by means of X-ray diffraction (XRD), UV - visible (UV- vis) diffuse reflectance, scanning electric microscopy (SEM) and X-ray spectroscopy (EDS) analysis, in the synthesis process to consider the Nd and I doped proportion and calcination temperature of titanium dioxide light catalytic activity; Asian methyl blue (MB) and bovine serum albumin (BSA) to examine the synthesis of doped titanium dioxide photocatalytic activity, examining the subject for examination preparation photocatalytic antibacterial properties of the material to the Escherichia coli (E. coli) and Staphylococcus aureus (S.aureus). The results showed that, Nd doped Ti02 grain growth can be prevented, and Ti02 several strong absorption peak in the visible region spectrum (528,587 683,750,808,881 nm) This is mainly due to the 4f electron of Nd structure. Can be greatly expanded I-doped TiO2 in the visible region of the response by Nd and I co-doping can the doped Ti02 energy band in the visible region of the minimum extended to 2.82ev (MNd: MI: MTi = 5:10:100 (molar ratio)). 300W iodine tungsten MB photocatalytic degradation of BSA damage have the highest photocatalytic activity doping Ti02 doped proportion of Mnd: MI: MTI = 5:10:100 (molar ratio), and its rate of degradation of the MB 3.86 × 10-2min-1 is about the pure TiO2 (2.28 × 10-3min-1) 17 times; proportion of optimum doping material antimicrobial kill primarily through the destruction of the surface of the cell membrane of E.coli and S.aureus E.coli and S.aureus. (3) by the sol - gel prepared a series of Nd and F-doped Ti02 photocatalytic materials, Nd and F-doped titanium dioxide photocatalytic materials characterization and (2) the methods used Nd and F doping ratio and calcination temperature on the photocatalytic activity of titanium dioxide in the synthesis process; methylene blue (MB) investigated the synthesis of doped titanium dioxide in the ultraviolet and visible light photocatalytic activity. The results showed that, Nd doped Ti02 in the role of F doped TiO2 polymorph growth and crystallization, and can make Ti02 absorption bandgap redshifts and enhance its in the UV region (2); absorption, which TiF5Nd0.5 largest redshift by calculating the band is 2.91eV. Photocatalytic degradation rate of MB under UV excitation maximum material TiF5Nd0.5, the degradation reaction rate constant of about 1.76 times that of pure Ti02; photocatalytic degradation rate of MB under visible light excitation same material TiF5Nd0.5, degradation of the reaction rate constant was about 1.45 times that of pure Ti02.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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