Comparison of photodegradative efficiencies and mechanisms of Victoria Blue R assisted by Nafion-coated and fluorinated TiO2 photocatalysts.
The purposes of this research were to study the effects of two modified photocatalysts, Nafion-coated TiO(2) and fluorinated TiO(2), and photocatalytic degradation of Victoria Blue R in aqueous solution. Photocatalytic degradation of Victoria Blue R was accelerated by the modified photocatalysts. Bulk and surface characterizations of the resulting powders were carried out. Attachment of the anions to the TiO(2) surface using the Nafion-coated-TiO(2) possibly results in increased adsorption of the cationic dye, and the degradation rate is larger for the cationic dye. It was found that Victoria Blue R on the two illuminated TiO(2) surfaces underwent very different changes. To obtain a better understanding on the mechanistic details of this modified-TiO(2)-assisted photodegradation of the Victoria Blue R dye with UV irradiation, a large number of intermediates of the process were separated, identified, and characterized by a high-performance liquid chromatography-mass spectrometry technique. Several probable photodegradation pathways were proposed and discussed.
Chen
K T
KT
Department of General Education, Ming Hsing University of Science and Technology, 304 Taiwan, ROC.
Lu
C S
CS
Chang
T H
TH
Lai
Y Y
YY
Chang
T H
TH
Wu
C W
CW
Chen
C C
CC
D000327:Adsorption; D000478:Alkylation; D002384:Catalysis; D005461:Fluorine / Q000737:chemistry*; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010777:Photochemistry; D012394:Rosaniline Dyes / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D005465:Fluorocarbon Polymers; D012394:Rosaniline Dyes; C009495:titanium dioxide; C034752:Basic Blue K; D005461:Fluorine; C040402:perfluorosulfonic acid; D014025:Titanium