II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-36
(COOH+OH), mg-eq/g
1,8
1,2
à
2
1
0,6
3
0
0 2 4 6
t, h
> С =O, mg-eq/g
4
3
b
1
2
2
1
3
0
0 2 4 6
t, h
A, %
60
1
40
20
2
0
3
0 2 4 6
t, h
Fig.1 Dynamics of accumulation of groups of acid character (a) and carbonyl groups (b) at
ozonization of AC (1), FD (2) and A (3)
Fig.2. Change of magnitude of adsorption of iodine by samples of AC (1), FD (2) and A (3)
after ozonization
Intensity of bands of absorption at 3400, 2500-2800, 1700-1750, 1260 sm -1 (-OH, >C=О
and -C-O-connections of OFG) increases and at 3040, 1600, 690-850 sm -1 (-С-Н and -С=Сaromatic
groups) decreases in IR- spectrums of ozonized samples. It indicates at participation
of aromatic fragments of structure of CM in reactions of ozonolysis.
Modification by ozone contributes change of adsorptivity of CM in relation to iodine and
pyridine. The reduction of sorptive capacity on iodine (fig. 2) can be caused by the blocking of
mouths of pores by educated functional groups. Especially it is typical for highly-porous AC.
The mechanism of sorption of pyridine, as against iodine, is based on specific interacting
of substance with surface groups of adsorbent due to formation of hydrogen bonds. Sorption
of pyridine after ozonization of CM has positive dynamics. In particular, at ozonization of AC
within three hours its adsorptive capacity in relation to pyridine increases in 5 times.
Thus, result of ozonization is accumulation of oxygen-containing groups and change of
adsorptivity of CM. The greater activity in relation to ozone has carbon materials with
advanced internal surface. Rise of sorption of pyridine by activated carbons after ozonization
can be used for cleaning of waste water of the plants of an organic synthesis and medical
products.
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