Document Detail


Effects of TiO2 coating dosage and operational parameters on a TiO2/Ag photocatalysis system for decolorizing Procion red MX-5B.
MedLine Citation:
PMID:  20359818     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In this study, titanium dioxide (TiO(2)) powder was coated onto the surface of a dendritic silver (Ag) carrier to synthesize TiO(2)/Ag for decolorizing Procion red MX-5B (MX-5B), and related operation factors were also studied. The results showed that even without ultraviolet-A (UVA) irradiation, the Ag carrier from the TiO(2)/Ag catalyst had oxidizing ability, which could effectively degrade MX-5B color, but TiO(2) was ineffective. In addition, TiO(2) from TiO(2)/Ag demonstrated photocatalysis performance when irradiated, and the Ag carrier further showed an electron-scavenging ability to mitigate electron-hole pair recombination, which can improve the photocatalytic efficacy. With the oxidization and electron-scavenging ability of Ag and the photocatalysis ability of TiO(2), TiO(2)/Ag can decolor MX-5B more efficiently than TiO(2). The heavier Ag carrier also improves the solid-liquid separation of nano-TiO(2), making TiO(2)/Ag more suitable for application in slurry systems of photocatalytic water treatment. When the TiO(2)/Ag coating ratio was 50% by weight, there was a sufficient amount of TiO(2) on Ag's surface with a good distribution, and it exhibited a good photocatalysis decolorizing effect. In a study of how operational factors impact the decolorizing of MX-5B in the TiO(2)/Ag photocatalysis system with UVA irradiation (UVA-TiO(2)/Ag), the decolorization efficiency was optimal when the solution was maintained at pH 6.35. The addition of 0.01 M hydrogen peroxide (H(2)O(2)) aided the photocatalysis decolorization efficiency, although excessive H(2)O(2) reacted with hydroxyl free radicals and decreased the active groups in the system, thereby reducing the photocatalysis activity. An operating temperature of 40 degrees C was conducive to MX-5B decolorization, which was better than operating at room temperature.
Authors:
Yu-Chih Lin; Ho-Shan Lee
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Publication Detail:
Type:  Journal Article     Date:  2010-03-15
Journal Detail:
Title:  Journal of hazardous materials     Volume:  179     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-05-14     Completed Date:  2010-08-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  462-70     Citation Subset:  IM    
Copyright Information:
2010 Elsevier B.V. All rights reserved.
Affiliation:
Department of Environmental Engineering and Health, Yuanpei University, 306 Yuan-pei St., Hsinchu City 300, Taiwan. yuchihlin@mail.ypu.edu.tw
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MeSH Terms
Descriptor/Qualifier:
Azo Compounds / chemistry*
Catalysis
Electrochemistry
Hydrogen Peroxide / chemistry
Hydrogen-Ion Concentration
Hydroxyl Radical
Microscopy, Electron, Scanning
Oxidants / chemistry
Photochemistry
Silver / chemistry*
Titanium / chemistry*
Ultraviolet Rays
Waste Disposal, Fluid
X-Ray Diffraction
Chemical
Reg. No./Substance:
0/Azo Compounds; 0/Oxidants; 0/Procion Red MX-5B; 13463-67-7/titanium dioxide; 3352-57-6/Hydroxyl Radical; 7440-22-4/Silver; 7440-32-6/Titanium; 7722-84-1/Hydrogen Peroxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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