کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1257615 | 971571 | 2011 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Catalytic effect of lucunary heteropolyanion containing molybdenum and tungsten atoms on decolorization of direct blue 71 Catalytic effect of lucunary heteropolyanion containing molybdenum and tungsten atoms on decolorization of direct blue 71](/preview/png/1257615.png)
In this research, a lucunary Keggin structure, [PMo2W9O39]7− was selected as an efficient homogenous catalyst for degradation of an azo dye (direct blue 71) and a simple method was developed for degradation of DB71. The method is based on the oxidation of azo dye in the presence of a lucunary Keggin form of polyoxometalates, K7[PMo2W9O39]·19H2O, as a homogenous catalyst at room temperature. The reaction is monitored spectrophotometrically by measuring the absorbance of dye at λ = 585 nm. Some parameters including concentration of catalyst, concentration of H2O2, pH and reaction time were investigated and optimized. Results show that K7[PMo2W9O39]·19H2O is more efficient in the presence of hydrogen peroxide. Degradation of dye in the presence of the catalyst and H2O2 could lead to the disappearance approximately 65% of dye after 60 min. But degradation for the same experiment performed in the absence of catalyst or in the absence of H2O2 was 22% or 5% respectively. Approximately 87% azo dyes has been eliminated after 90 min in the presence of catalyst, H2O2 and optimize conditions (0.6 g/L of K7[PMo2W9O39]·19H2O, 0.08 mol/L hydrogen peroxide and room temperature).
Journal: Chinese Chemical Letters - Volume 22, Issue 12, December 2011, Pages 1501–1504