Abstract
The potentiality of fly ashes from coal-fired power plants has been investigated as heterogenous catalyst in oxidative decolourization of aqueous solutions of several reactive, acid and chrome dyes, using H 2 O 2 in the temperature range 300-323 K. It is observed that the catalytic activity of fly ashes depends on their physico-chemical characteristics and pH of the reaction medium. For an initial dye concentration of 100 mg/L and H 2 O 2 of 5.2 x 10 -2 kmol/m 3 , complete decolourization is possible within 1500, 900 and 600s of all reactive, acid and chrome dyes, respectively, at 313 K and pH 3.75 ± 0.15 using 2% (w/v) fly ash loading. The extent of deactivation of catalytic effect of fly ash depends on total contact time, characteristics of fly ash surface and specific dye used.
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