| Photocatalytic degradation of dye pollutants in the presence of acetone. | |
| | |
MedLine Citation:
|
PMID: 11700657 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The photodegradation of textile azo dyes in aqueous solution containing acetone (ACE) photosensitizer was investigated at 253.7 nm. In this study, a typical azo reactive dye (C I Reactive Red 2-RR2) is used as the probe compound. ACE is a powerful photosensitizer that possesses high triplet energy, and the presence of ACE significantly enhances the overall photodegradation reaction through simultaneous sensitization. In the UV/ACE system, at the optimum conditions, over 97% of RR2 can be successfully decomposed and decolored within 300 seconds of retention time. The photodegradation mechanisms of RR2 involve both photodechlorination and photoreduction, which follow pseudo first-order decay kinetics. The quantum yield of the photolysis system has been evaluated as a function of ACE concentration and the initial pH. RR2 contains the chlorotriazinyl group, which undergoes hydrolysis and results in the formation of hydrochloric acid, indicating that the photodechlorination process is the dominant reaction mechanism. The photo-product, H+, is likely to retard the quantum yield of dye decay, suggesting that the initial pH is a critical factor in changing the photodecolorization rates of dye. Generally, this system is more favorable at higher pH levels. |
| | |
Authors:
|
S M Tsui; W Ch |
Related Documents
:
|
10993227 - Interactions between local anesthetics and na+ channel inactivation gate peptides in ph... 11858207 - Effect of ph on hydrogen production from glucose by a mixed culture. 16570597 - Suppression of dissolved organic carbon by sulfate induced acidification during simulat... 10992237 - Effect of ph on the production of lipolyzed butter oil by a calf pregastric esterase im... 17400467 - Cellular ascorbic acid regulates the activity of major peroxidases in the apical poles ... 19582297 - Dynamic polythioesters via ring-opening polymerization of 1,4-thiazine-2,5-diones. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Water science and technology : a journal of the International Association on Water Pollution Research Volume: 44 ISSN: 0273-1223 ISO Abbreviation: Water Sci. Technol. Publication Date: 2001 |
Date Detail:
|
Created Date: 2001-11-09 Completed Date: 2002-03-05 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 9879497 Medline TA: Water Sci Technol Country: England |
Other Details:
|
Languages: eng Pagination: 173-80 Citation Subset: IM |
Affiliation:
|
Research Centre for Urban Environmental Technology and Management, Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Acetone
/
chemistry* Catalysis Coloring Agents / chemistry* Hydrogen-Ion Concentration Photolysis Solvents / chemistry* Ultraviolet Rays Water Pollutants, Chemical / analysis* Water Purification / methods* |
| Chemical | |
Reg. No./Substance:
|
0/Coloring Agents; 0/Solvents; 0/Water Pollutants, Chemical; 67-64-1/Acetone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Wastewater management in Greece: experience and lessons for developing countries.
Next Document: Sustainable development in pollution control and the role of anaerobic treatment.