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Effects of the modification of the activated carbon physico-chemical characteristics onto the organic compounds adsorption


Effects of the modification of the activated carbon physico-chemical characteristics onto the organic compounds adsorption



Aqua 43(6): 278-286



ISSN/ISBN: 0003-7214

This work describes the adsorption of organic molecules (phenol, salicylic acid, benzoic acid, picric acid) on activated carbons with different amounts of oxygen surface groups. The effect of thermal treatment on various activated carbons from different origins has been studied by Boehm titration, zeta potential, BET specific area, water spreading pressure pi-o and ionic elements titration. The activated carbons have internal areas of 650, 1150 and 950 m-2/g for wood carbon, mineral carbon and coconut carbon, respectively. The results showed that the adsorptions capacities are not affected by the surface area. For the determination of the adsorption enthalpy with the Temkin model, other parameters are very important. This Temkin model needs the value of the maximum adsorption capacity. The decrease of the activated-carbon-water interaction potential may also be reflected by the decrease in surface energy expressed by the spreading pressure (pi-o), which is by definition the surface energy of the solid due to the adsorption water vapour. The data for adsorption of organic compounds are estimated by adsorption isotherms. The results presented show that both the microporosity, and the chemical nature of activated carbon affect the adsorption process. For a nondissociated molecule (phenol) the adsorption is mainly influenced by the porous structure. The nature and amounts of oxygen surface groups, however, are extremely important for the adsorption of polar molecules.

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Accession: 008584016

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