Investigations of sorption properties of activated carbon fibrous materials.
Part 2. The influence of oxidation on the sorption of metals


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Nanostructural Material Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2009, #2


The conditions for modification of the surface of carbon fibrous nanostructured material – ACFM ( ABBM «Днепр» - МН ) by oxidation with nitric solution have been investigated. The oxidized carbons with increased cation-exchanging capacity ( in the range 4.1-6.95 mg.eq./g) were formed. The regularities of adsorption of heavy and toxic metals by the initial and oxidized ACFM have been studied. The adsorption of metals by non-oxidized sorbents was established to depend on the sorbent pore structure: ACFM with a summary pore volume of 0.98 cm3/g adsorbs Cs, Al, Cu and Pb ions by 10 - 30 % more than the sample with a summary pore volume of 0.32 cm3/g. Adsorption by the oxidized ACFM was shown to be more active compared to that on the non-oxidized sample, especially at an initial metal concentration of 10 mg/l, and to equal 84.0, 99.8, 99.0 and 100.0 % for Cs, Al, Cu and Pb ions, respectively. This fact can be related to the important role of an oxidized surface in the processes of ion-exchange.