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Assessment of Photocatalytic Activity of Self-cleaning Materials

Author: ZhouHeHui
Tutor: ZhuLiHua
School: Huazhong University of Science and Technology
Course: Analytical Chemistry
Keywords: Photocatalytic Activity Light self-cleaning materials 7 - hydroxycoumarin Fluorescent probe Nano TiO2 Smart coatings
CLC: TB302
Type: Master's thesis
Year: 2007
Downloads: 106
Quote: 1
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Abstract


Light self-cleaning materials as a new class of green materials, air purification , antibacterial deodorizing , antifouling anti-fogging, self-cleaning with an attractive prospect . Industrial production have a self-cleaning glass and ceramic , but its performance testing has not been a unified standard . This paper prepared by the sol - gel method improved 8 kinds of different light photocatalytic effect self-cleaning materials , established 7 - hydroxycoumarin fluorescent probe fluorescence spectrophotometry fast and accurate detection of light self-cleaning materials performance ; the smart coatings law and literature made ??improvements solve blank discoloration . Specific study results are as follows : (1) a certain percentage of TiO2 , the PVA and distilled water by the ultrasonic mixing , heating dissolved TiO2 sol , the deposition by pulling air dried in a muffle furnace 300 ° C for aerobic calcined 2H , not change the TiO2 polymorphs burning to PVA, light self-cleaning materials . Change of TiO2 species and film-forming substrate prepared different photocatalytic properties of self-cleaning materials . The self-cleaning effect with the light obtained in the optical self-cleaning material , can satisfy the experimental requirements . (2) 7 - hydroxycoumarin as a fluorescence probe , by fluorescence spectroscopy detecting its maximum fluorescence emission wavelength of the fluorescence intensity with the light from the variation of the oxidation time of the cleaning material can be detected by the ability of photogenerated holes of the light from the cleaning material indirectly Determination of photocatalytic activity of the light self-cleaning materials . Measurement results with conventional photocatalytic oxidation degradation of azo dyes Determination completely consistent results , and the sensitivity of fluorescence spectrophotometry nearly 5,000 times higher than the latter , and the detection time of just 1 / 6 of the latter , only 40min in inorganic ions Cu2 and the presence of F- , all kinds of light self-cleaning photocatalytic properties of the materials are slightly higher . ( 3) the use of the dye the Rz / glycerin / the diluent A / hydroxyethylcellulose , four - membered mixed material detection light self-cleaning properties of the materials , the detection time is less than 15 min, and the detection result is accurate ; compared with the fluorescence spectrophotometry , although the sensitivity is not high , but the detection time is short, can be used for on - site rapid detection of light self-cleaning properties of the materials in situ .

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