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Number (%)
Number (%)
35
25
30
25
20
15
10
5
0
20
15
Average = 15
Average = 29
μ m
10
5
0
5 10
15
20
25
30
35
40
45
50
1020304050607080
Length ( μ m)
Aspect ratio
(a)
(b)
Figure 10.71 Distributions of (a) the length and (b) the aspect ratio of selected whiskers.
Source: Courtesy of W. Suchanek.
Figure 10.72 IR-spectra of the
whiskers which improved
stoichiometry (Ca/P molar
ratios 1.64 and 1.67) [335] .
600ºC (1 h)
HPO 2-
600ºC (72 h)
CO 2 (air)
PO 4
H 2 O
CO 2-
OH -
PO 4
PO 4
OH -
PO 4
PO 4
3950
2000
1500
1000
400
Wave number (cm -1 )
There is much scope for the impregnation of a suitable semiconductor onto the
activated carbon surface layers to prepare a carbon/semiconductor photocatalyst.
The adsorption capacities and the feasible removal rates could be substantially
boosted by the impregnation of the activated carbon with suitable semiconductors.
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