Environmental Engineering Reference
In-Depth Information
(a)
(b)
Ga/Ta1
Ga/Ta1
Ga/Ta3
Ga/Ta3
c
a
b
b
figure 12.5
Structural features of monoclinic Sm
2
GaTaO
7
. (a) Sm
2
GaTaO
7
with hexagonal tungsten bronze (HTB) arrangement and (b)
Sm
2
GaTaO
7
forming 2d HTB blocks structure. Reproduced with permission from Ref. [29]. © IJHe.
700
(b)
600
500
400
300
(a)
(c)
(d)
200
100
0
0
1
2
3
4
5
Time (h)
figure 12.6
Photocatalytic hydrogen production of Sm
2
GaTaO
7
materials: (a) Sm
2
GaTaO
7
, (b) 0.2 RuO
2
/Sm
2
GaTaO
7
, (c) 0.9 RuO
2
/
Sm
2
GaTaO
7
, and (d) 1.5 RuO
2
/Sm
2
GaTaO
7
. Reproduced with permission from Ref. [29]. © IJHe.
table 12.4
Photocatalytic activity of bi
2
mtao
7
pyrochlore-type compounds for alizarin red degradation
Bi
2
AlTaO
7
Bi
2
FeTaO
7
Bi
2
GaTaO
7
Bi
2
In
TaO
7
Synthesis
T
(°C)
%
D
t
1/2
(h)
%
D
t
1/2
(h)
%
D
t
1/2
(h)
%
D
t
1/2
(h)
SG-400
30
6.5
90
1.0
50
4.0
90
1.0
SG-600
70
2.0
80
1.5
30
8.0
~100
0.5
SG-800
80
1.5
75
2.5
15
16.5
80
1.5
Solid state
60
2.5
40
6.5
20
10.5
~100
1.0
As given in Table 12.4, it is observed that Bi
2
InTaO
7
shows the highest activity.
Bi
2
InTaO
7
was also tested as a photocatalyst for red tide and green tide degradation. Figure 12.7 shows the photocatalytic
behavior of these reactions [19].
