Impact of the interaction with the positive charge in adsorption of benzene and other organic compounds from aqueous solutions on carbons |
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Authors: | Artur P Terzyk Magdalena S ?wiertnia Marek Wi?niewski Piotr A Gauden Gerhard Rychlicki Grzegorz S Szymański |
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Institution: | N. Copernicus University, Faculty of Chemistry, Physicochemistry of Carbon Materials Research Group, Gagarin Street 7, 87-100 Toruń, Poland |
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Abstract: | We present the results of benzene adsorption at the acidic pH level determined on the series of chemically modified activated carbons and at three temperatures. The influence of carbon surface chemical composition on benzene adsorption is discussed. It is shown that the decrease in the pH level from 7 up to 1.5 increases benzene adsorption and the only exception is carbon modified with gaseous ammonia. Basing on the results of current work and those published previously (for phenol, paracetamol, acetanilide and aniline) and using the results of quantum chemistry calculations (DFT, Gaussian 98) we show, that the value of the energy of interaction with unit positive charge is crucial during the analysis of the influence of pH level on adsorption. Obtained results allow to predict the changes in adsorption of aromatics on carbons with the decrease in the pH level. |
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Keywords: | Adsorption from solution Activated carbon Gaussian 98 Benzene Phenol Paracetamol Acetanilide Aniline DFT |
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