Catalytic properties of Polyoxometalates and its application in Dyes Removal from a Textile Effluent

Type : Article de conférence
Auteur(s) :  A. BALASKA, R. AYECHE, M.H. SAMAR, O. Bechiri, H. MERADI, T. CHOUCHANE, H. BENDJEFFAL, M. ABBESSI
Année :  2010
Domaine : Génie Chimique
Conférence: Congrès International sur la Chimie des Matériaux et l’Environnement (CIME 2010)
Lieu de la conférence:  Algiers, Algeria
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  Wastewaters treatment; dyes; polyoxometalates; counter ions; catalysts

Résumé : 

The Wells-Dawson-derived sandwich-type polyoxometalates (POMs) and many of their transition- metal complexesare especially promising in catalysis are a versatile and robust group of compounds with applications in catalysis. The physicochemical and catalytic behaviors of multi-iron Wells-Dawson sandwich-type polyoxometalates were studied, when NMRP and Infrared spectra of heteropolyanions (POMs)were used to explain the structure catalysts formed.Catalytic properties of the sandwich-type heteropolytungstate [P2W18O62]6- in the selective oxidation of organic substrates with aqueous H2O2 have been studied. This work shows results on the catalytic oxidation process for a dye used in textile industry.Catalytic activity of the polyoxometalates oxidation for dye solution was determined by measuring the chemical oxygen demand and colour removal. The influence of the main operating parameters, hydrogen peroxide concentration, pH, temperature and dye concentration have been studied, in a batch-type operation. The results obtained show that the best pH value for decolorisation was pH 3, with an average decolorisation of 94% and average removal of chemical oxygen demand of 91% at 20°C.