Citation: Masoumeh Tabatabaee, Maria Roozbeh, Mandana Roozbeh. Catalytic effect of lucunary heteropolyanion containing molybdenum and tungsten atoms on decolorization of direct blue 71[J]. Chinese Chemical Letters, ;2011, 22(12): 1501-1504. doi: 10.1016/j.cclet.2011.07.016 shu

Catalytic effect of lucunary heteropolyanion containing molybdenum and tungsten atoms on decolorization of direct blue 71

Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran

Received Date: 8 April 2011

Fund Project: Foundation item:Supported by the Islamic Azad University Yazd Branch.

In this research, a lucunary Keggin structure,[PMO₂W₉0₃₉]^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]·19H₂0 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[PMO₂-W₉O₃₉]·19H₂O, 0.08 mol/L hydrogen peroxide and room temperature).
- Degradation,
- Homogenous catalyst,
- Polyoxometalates,
- Lucunary Keggin structure
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