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Study on Degradation of Indoor Hazardous Gases by Modified Titanium Dioxide

Author: YuYiLong
Tutor: XuRuiFen
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Titanium dioxide Xylene Degradation The electrochemical tests
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 119
Quote: 1
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Abstract


This thesis uses the gas chromatography test method and electrochemical test method and oscillation elution method , explore the effect of the nanocrystalline titanium dioxide sprays in different sensitizer , different consumption charge agent and a coupling agent is added after the degradable vapor xylene , bactericidal effect , some the variation of the electrochemical signal and its links between them . Found by vapor - xylene degradation tests : sensitizer added helps degradation effect of the increase , the sensitizer B titania improve the degradation efficiency is preferred , consistent with the results with the test results of the electrochemical Ⅰ - Ⅴ curve , which shows a better matching of the energy levels of the sensitizer B with titanium dioxide energy level . State of titanium dioxide in the spray can be seen by TEM images for the dispersion of nanoparticles , titanium dioxide dispersed particle size to the nanoscale after have the quantum size effect , small size effect , these effects will increase titanium dioxide photoexcitation the number of carriers , which increases the generation of reactive groups , improve the titanium dioxide spray degradation of xylene efficiency by . Titania presents nanoparticle dispersion , the excited electrons migrate from the body to the surface of the material much less than the time of electron and hole recombination and reduce the probability of recombination of electrons and holes , improving the photocatalytic efficiency of titanium dioxide Spray performance significant degradation efficiency of p-xylene . Tested by cyclic voltammetry can be seen: by photoelectric excitation energy , · OH, O2-· and other active groups generated . By comparison · OH and hole activation energy and organic matter the size of the chemical bond energy to explore the inherent law of nano-titanium dioxide mechanism of degradation of organic harmful gases , as well as time-dependent degradation effect . Titanium dioxide nanoparticles under light excitation , the active groups can be generated organic gases degrade into non-toxic small molecules CO2, H2O and other small molecules .

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