期刊
DYES AND PIGMENTS
卷 60, 期 2, 页码 167-176出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2003.07.004
关键词
decolourization; heteropoly acid; heteropoly blue; H4SiW12O40; disperse dyes; photochemical degradation
A new method for disperse dye decolourization using the photochemically active silicadodecatungstic acid (H4SiW12O40) + isopropanol (electron donor) redox system has been described. Results of a series of control experiments have indicated that the one-electron reduced form of the silicadodecatungstic acid, SiW12O405-, was responsible for reductive cleavage of disperse dye as evidenced by photochemical heteropoly blue generation upon H4SiW12O40 + isopropanol UV-illumination. A threshold (0.09 mM) and an optimum (0.5 mM) heteropoly acid dose existed for minimum and maximum decolourization rates, respectively. It was also evident that decolourization kinetics were first-order with respect to dye concentration for concentrations up to 75 mg/l, and the photochemical degradation rate became UV-light penetration limited (zero order) above 100 mg/l dye concentration. (C) 2003 Elsevier Ltd. All rights reserved.
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