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Granular nanoporous activated carbon prepared from polyacrylonitrile (PAN) was investigated as a means of removing weak aromatic acids from aqueous solutions. This carbon is highly nanoporous, the BET surface area being 544m 2 /g with V tot =0.278cm 3 /g, and V micro =0.266cm 3 /g. Aqueous treatment reduced the surface area to 364m...
Carbonaceous materials obtained from polyethyleneterephthalate (PET), a potential precursor for polymer-based carbon, were studied after heat treatment at 750, 900 and 1200 o C in an inert atmosphere. The carbon content increases to more than 95% (w/w) already at the lowest temperature applied. The surface area decreases from 242 to 14.7 m 2 /g between 750 and 1200 o C, causing...
The enantiomers of tetramisole were produced by partial diastereomeric salt formation with O,O'-dibenzoyl-(2R,3R)-tartaric acid monohydrate and subsequent supercritical fluid extraction (SFE) of the unreacted enantiomers in the presence of an achiral support. The effect of the activated carbon and Perfil 100 on the efficiency of chiral separation were studied. The kinetics of the process was found...
A predominantly microporous activated carbon produced from polyethyleneterephthalate (PET) by physical activation (burn-off 50%) has a BET surface area of 1170 m 2 /g and a total pore volume of 0.625 cm 3 /g. Its surface possesses an amphoteric nature due to the oxygen functionalities present, however, the majority of the groups are basic. The adsorption of phenol and 2,3,4-trichlorophenol...
Carbonized chars prepared from polyacrylonitrile, polyethyleneterephthalate and cellulose were activated in a steam/nitrogen flow to ca. 50% burn-off (b.o.). The surface chemistry of these carbons has been characterized by X-ray photoelectron spectroscopy (XPS), adsorption from benzene-methanol binary liquid mixture, and potentiometric acid-base titration. The activation of the various polymer-based...
The effect of the precursor polymer on nitrogen adsorption properties, pore size distribution and the hydrophilic/hydrophobic character of both the pyrolyzed char and the activated carbon was studied in the case of three basically different polymers, i.e. polyacrylonitrile, polyethyleneterephthalate and cellulose. Pyrolyzed samples were produced from these polymers and activated by steam at 900 ...
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