Environmental Engineering Reference
In-Depth Information
(a)
(b)
1 μm
1 μm
Signal A=QBSDDate :27 May 2011
Time :12:02:33
Signal A=QBSD
Photo no.=6064
Date :12 Nov 2011
Time :16:45:26
EHT = 15.00kV
WD=5mm
EHT = 15.00kV
WD=5mm
Photo no.=4063
(c)
(d)
100 nm
50 nm
figure 25.2
SeM images show nano-sized birnessite (a) before and (b) after treating with BSa solution. TeM images show nano-sized
birnessite (c) before and (d) after treating with BSa solution. For experimental details, see experimental methods. reprinted with permission
from ref. [24]. © 2012, Springer.
recently, a biomimetic chalcogel was reported that is capable of photocatalytic hydrogen evolution under simulated
solar illumination [47]. The new chalcogels are prepared from double-cubane Mo
2
Fe
6
S
8
cluster units linked by Sn
2
S
6
ligands, forming a random, amorphous network with strong optical absorption. The switch from Fe
4
S
4
cubane units to
Mo
2
Fe
6
S
8
double-cubane units illustrates the flexibility and ease with which we can synthesize chalcogels with a variety of
