Adsorption of pentachlorophenol from aqueous solution onto commercial activated carbons [Adsorción de pentaclorofenol en solución acuosa sobre carbones activados comerciales]
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abstract
The adsorption of pentachlorophenol (PCF) from aqueous solution onto the commercial activated carbons F-300, MG, F-400, VG, C and CG-700, was investigated in this work. The F-300, MG and F-400 carbons are manufactured from bituminous coal and the VG, CG-700 and C, from pinewood, coconut shell and wood sawdust, respectively. The experimental adsorption isotherm data for PCF were interpreted using the Langmuir, Freundlich, and Prausnitz-Radke isotherms, and it was found that this last isotherm fitted the data better than the other two. The adsorption capacities of the carbons diminished in the following order: MG ≈ F-300 > F-400 > VG > C> CG-700. The three carbons that possess the largest adsorption capacities are made from bituminous coal. The F-300 and MG carbons were oxidized with nitric acid and it was observed that their adsorption capacities decreased 17.7 %25 and 31 %25, respectively. PCF is chemisorbed on the F-300 and MG carbons.
