Environmental Engineering Reference
In-Depth Information
figure 12.8
Crystal structure of Na
2
Ti
6
O
13
. Reproduced with permission from Ref. [20]. © 2008, Springer.
figure 12.9
Scanning electron microscopy (SeM) micrographs of Na
2
Ti
6
O
13
where the presence of microrods can be observed.
Reproduced with permission from Ref. [20]. © 2008, Springer.
table 12.5 Kinetic parameters of methylene
blue degradation using na
2
ti
6
o
13
as photocatalyst
Sol-gel
Na
2
Ti
6
O
13
k
(min
−1
)
t
1/2
(min)
400°C
0.0149
46
600°C
0.0011
630
12.1.4 Sic-tio
2
compounds
SiC has been considered as a support due to its properties like high thermal conductivity, high mechanical strength, as well as
low chemical reactivity. In this work, TiO
2
was deposited on SiC by the sol-gel method, but in order to increase the efficiency
of the photocatalytic activity, time of deposition was decreased considerably. SiC-TiO
2
has been tested as a catalyst for the
degradation of indigo carmine and methylene blue dyes. In this case, SiC-TiO
2
was prepared via sol-gel method [22, 23].
According to the results, SiC did not undergo any reaction after the deposition of TiO
2
(Fig. 12.10).