Visible-light-driven bismuth vanadate photocatalysts were synthesized using a homogeneous coprecipitation
process. X-ray diffraction (XRD) results reveal that the obtained powders consisted of
monoclinic BiVO4. Surface characterizations by XPS and diffuse reflectance infrared Fourier transform
spectroscopy (DRIFTS) confirm the presence of surface hydroxyl groups on BiVO4. The effect of adsorption
ability on photocatalytic activity of BiVO4 was investigated by isopropanol (IPA) adsorption and
DRIFTS. All BiVO4 samples exhibited a higher level of activity than that of a commercial TiO2 photocatalyst
(P25). The FTIR spectra verifying the high photocatalytic performance of BiVO4 can be attributed to
the rich surface hydroxyl groups that favor the high adsorption of IPA. The sample synthesized at 90 ◦C
for 24 h (BV24) exhibits the best photocatalytic activity as evaluated using the apparent rate constant
for initial photodegradation of gaseous IPA and the mineralization yield after long-term light irradiation.
For an irradiation time of 720 min, the mineralization yields of IPA were 88% and 41% for BV24
and P25, respectively. This high visible-light photoactivity was ascribed to high adsorption ability, high
crystallization, and large surface hydroxyl groups.