The coupled Bi2WO6/TiO2−P25 sample was synthesized
with the same method. The corresponding amount of
commercial TiO2 (Evonik, P25) was added to the white
suspension of Bi−W prior to the hydrothermal treatment, with
a TiO2/Bi2WO6 ratio of 50% wt. This material was named
BW−Ti.