Au nanoparticles deposited on mesoporous TiO 2 -B nanofibers have been prepared, characterized, and used to catalyze photoreactions of iodomethane. High-density gold-particle deposition on TiO 2 -B is obtained by electrostatic and/or chemical force between the particles of TiO 2 -B and Au capped with -SC(H)(CO 2 H)(CH 2 CO 2 H) through pH control. The capping groups on the gold particles can be removed after 400 °C calcination. It is found that the nature of the inorganic acids used for pH adjustment has effects on particle morphology and deposition. Two other methods, i.e., preparation of TiO 2 -B nanofibers in the presence of gold particles and preparation of gold nanoparticles in the presence of TiO 2 -B particles (deposition-precipitation method), are also investigated. However, the former method produces a low-density deposition and the latter one induces a morphology change of the TiO 2 -B and an increase of the Au in size. Fourier transform infrared spectroscopy has been employed to study and to compare the photoreactions of CH 3 I on TiO 2 -B and Au/TiO 2 -B and the effect of O 2 . The presence of gold particles on TiO 2 -B increases the efficiency of CH 3 I photodegradation, forming adsorbed methoxy and formate. The role of gold is also discussed.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films