Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16673
Title: Quantum yield study of the photodegradation of hydrophobic dyes in the presence of acetone sensitizer
Authors: Tsui, SM
Chu, W 
Keywords: Acetone
Anthraquinone
Azo
Disperse dye
Quantum yield
Sensitizer
Ultraviolet
Issue Date: 2001
Publisher: Pergamon Press
Source: Chemosphere, 2001, v. 44, no. 1, p. 17-22 How to cite?
Journal: Chemosphere 
Abstract: The photodegradation of hydrophobic disperse dyes with different chromophores in the presence of acetone (ACE) was investigated. In this study, the photodecay of dyes was carried out in the Rayonet™ RPR-200 merry-go-round photoreactor, with 253.7 nm monochromatic ultraviolet (UV) lamps. A typical azo disperse dye (CI disperse yellow 7-DY7) and an anthraquinone disperse dye (CI disperse orange - DO11) were used as the probe compounds. The results demonstrate that the addition of acetone increases the solubility of hydrophobic disperse dyes and enhances the photosensitization reaction simultaneously. More than ten times of quantum yield enhancement is observed in the presence of ACE photosensitizer than in water alone. The photodegradation of DY7 and DO11 is dominated by photoreduction, which follows pseudo first-order decay, and the rate constants strongly depend on the solvent system (i.e., ACE/H2O ratios) and the initial pH levels. The decay quantum yields of dyes are normally observed with the increase of the ACE/H2O ratio. The optimum quantum yields of DY7 and DO11 were determined at 0.5 (v/v) and 0.25 (v/v), respectively, in alkaline conditions. A further increase in the ACE/H2O ratio reduces the quantum yields, possibly due to light attenuation by excess acetone.
Description: Special issue with papers presented at ICUPCT : International Conference on Urban Planning and Transportation System
URI: http://hdl.handle.net/10397/16673
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/S0045-6535(00)00379-9
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