Adsorption of fluoride from aqueous solution on aluminum-impregnated carbon

The adsorption isotherms of fluoride from an aqueous solution on plain and aluminum-impregnated activated carbons were measured in this study. The imp regnated carbon was prepared by impregnation with an aluminum nitrate solut ion at a fixed pH, followed by calcination under nitrogen at temperatures a bove 300 degrees C. The adsorption of fluoride on impregnated carbon was sh own to be dependent upon both the pH of the impregnating solution and the t emperature of calcination. Impregnated carbon was shown to have a fluoride adsorption capacity of 3 to 5 times that of plain activated carbon. (C) 199 9 Elsevier Science Ltd. All rights reserved.