Photodegradation of CH 3 I on mesoporous TiO 2 -B nanofibers with Au nanoparticles

Jr Sheng Li, Dong Lin Shieh, Dian Yi Li, Chia Hsun Ho, Shang Ju Yang, Jong Liang Lin

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4655-4664
Number of pages10
JournalApplied Surface Science
Volume254
Issue number15
DOIs
Publication statusPublished - 2008 May 30

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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