The
Sol–gel method is successfully used to prepare high
specific surface area TiO
2
(HSTiO
2
). Then, the
photodeposition method is used to composite silver particles with
HSTiO
2
. X-ray diffraction, scanning electron microscopy,
transmission electron microscopy, Brunauer–Emmett–Teller,
and UV–vis spectroscopy are used to characterize the Ag/HSTiO
2
nanocomposites. It can be concluded that the prepared TiO
2
has a large specific surface area, reaching 125.5 m
2
g
–1
. Additionally, the addition of silver particles
successfully broadens the photoresponse range from the UV region to
the visible light region. In order to evaluate the photocatalytic
activity of Ag/HSTiO
2
, we conducted the methyl orange degradation
test. The results showed that the photocatalytic activity of the sample
is significantly higher than that of pure TiO
2
.