The composites of different semiconductors based on the nanoscale coupling effect for photocatalytic application has been a challenging yet very important research topic. Bi 2WO 6 and TiO 2, the two most extensively studied photocatalysts, were successfully coupled via a facile one-step hydrothermal process. The as-prepared Bi 2WO 6/TiO 2 possessed enhanced visible-light-induced activity in photocatalytic degradation of contaminants in aqueous/gaseous phases compared with those of the sole Bi 2WO 6 or TiO 2. The versatile Bi 2WO 6/TiO 2 photocatalyst also exhibited long-time recyclable ability for the contaminants degradation under visible irradiation (λ>420nm) of Xenon lamp or household fluorescent lamp. The photoluminescence and electrochemical impedance spectroscopy are both adopted to analyze the physical properties of the photogenerated carriers and it was found that the separation of photogenerated carriers of Bi 2WO 6 has been largely promoted after being coupled with wide-band-gap semiconductor TiO 2. This work could be extended to the design of other composite photocatalyst with the purpose of enhancing activity by coupling suitable wide and narrow band-gap semiconductors, which is inspiring for the practical environmental purification.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Process Chemistry and Technology