Semiconductor
photocatalysis
has
attracted
considerable
atten-
tion
as
a promising
candidate
for
the
removal
of
hazardous
organic
contaminants
from
air
or wastewater
and
a green
technique
to
produce
hydrogen
by
water
splitting
[1,2]
and
convert
carbon
diox-
ide
into
gaseous
hydrocarbons
[3,4].