Commercial granulated activated carbon Norit R3ex after demineralisation with conc. HF and HCl acids was oxidised usig conc. nitric acid at 353 K for 3 hrs and heated in vacuum at 423 K. From the oxidised using conc. nitric acid at 353 K for 3 hrs and heated in vacuum at 423 K. From the oxidised carbon the appropriate powdered and core samples were obtained by the method in which the successive layers are removed from the granules by abrasion in a spouted bed. The abrasion treatment was carried out in two steps: elimination of about 33percent and 67percentwt. of the starting granules. The powdered samples were taken from the external and middle layer of the granules leaving behind granular core samples. In all carbon samples total oxygen contents, as well as surface functional oxygen groups were determined. Additionally the surface chemical structure of the samples was determined by FTIR spectroscopy. The excess adsorption isotherms of the selected cations (Fe~(3+), Co~(2+), Cu~(2+)) on the obtained samples were determined at 298 K. Adsorption took place from aqueous solution with different pHs of corresponding nitrates. The relationship between the adsorption capacity and chemical structure of adsorbent surface was analysed and discussed.
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