(143af) Obtaining Activated Coal from Waste of Tanneries and Their Importance in the Removal of Chrome Hexavalente

Present work involves coal activation starting from waste of tanneries in order to remove chrome hexavalente in watery solutions. The samples were carbonized at 400, 450, 500 and 550 °C during 30 minutes in atmosphere of nitrogen(flow of 110 mL /min, rate of heating of 10 ºC/min), they were milled and they sifted to a size of particle of 0.125 mm, they were chemically activated with KOH 35% with constant agitation during 4 hours, they warmed in nitrogen atmosphere (flow of 110 mL /min), 600 5 ºC warmed for 60 minutes (condition mentioned) and lastly they were washed with hot and cold water until pH 8. A solution was prepared with 70 ppm of Cr(VI) starting from dicromato of potassium, 0.5 grams of each material were weighed, they were added 50 mL of this solution and after shaking to ambient temperature to 120 rpm during 12 hours, the solutions were analyzed for UV-VISIBLE (espectrophotómeter PERKIN ELMER Lambda 3B UV/VIS). The results showed that the capacity of chromium adsorption depends on the microporos area.