کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
152732 | 456506 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The influence of selected parameters on the photocatalytic degradation of azo-dyes in the presence of TiO2 aqueous suspension The influence of selected parameters on the photocatalytic degradation of azo-dyes in the presence of TiO2 aqueous suspension](/preview/png/152732.png)
The aim of this study was to determine the influence of various parameters such as the initial concentration of dye and catalyst, the volume of irradiated solution and its absorbance on the kinetics of photocatalytic degradation of azo-dyes.The studies were carried out in aqueous solutions containing the individual azo-dyes (Acid Black 1, Acid Orange 7, Basic Orange 66) and in their mixtures, in the presence of two types of TiO2 as photocatalyst and under UV light irradiation. It was found that under given experimental conditions, the photocatalytic degradation of investigated dyes exhibited pseudo first-order kinetics according to the Langmuir-Hinshelwood's heterogeneous catalysis model but only in the limited range of initial dyes concentrations. Moreover, the optimum TiO2 concentration, the pH value of zero charge point, the adsorption efficiency of dyes on catalysts and the optimum volume of irradiated solution were found. It was stated that in mixtures, dyes underwent photodegradation slower than in the one-component solutions. This phenomenon has been connected with the absorbance of irradiated solutions.
Journal: Chemical Engineering Journal - Volume 145, Issue 2, 15 December 2008, Pages 242–248