Removal of Uranium and Nitrate Ions in Sludge Waste by Electrosorption
نویسندگان
چکیده
The electrosorption of U(VI) and NO3 from waste water was carried out by using an activated carbon fiber(ACF) felt electrode. Electrosorption experiments showed that the applied negative potential increased the adsorption kinetics and capacity in comparison to the open circuit potential(OCP) adsorption for uranium ions. The absolute value of the applied negative potential controlled the adsorption rate of the uranium. For the feed concentration of 100 mg/L, the concentration of U(VI) in the cell effluent is reduced to less than 1 mg/L. In order to enhance the electrosorption capacity at a lower potential, the ACF electrode was chemically modified. The electrosorption capacity of U(VI) on the base treated electrode at – 0.3 V corresponds to that of the as-received ACF electrode at –0.9 V. Effective nitrate removal is obtained by the application of a positive potential in the range of +0.6 to +0.8 V to the ACF electrode. A copper metal modified ACF enhanced the sorption of the nitrate ions. Copper atoms incorporated on the ACF surface worked as adsorption sites when the potential was applied, thus enhancing its electrosorption.
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