Exploring the relationship between surface structure and photocatalytic activity of flame-made TiO 2-based catalysts

Yijiao Jiang, Jason Scott, Rose Amal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Bare titanium dioxides (TiO 2) and doped with metal (Cu) or non-metal ion (F) were synthesized by a single-step flame spray pyrolysis (FSP) method. According to the BET, XRD, and TEM results, the Cu- and F-doped TiO 2 nanoparticles synthesized by FSP possess comparable features in terms of surface area, crystallite size and phase composition, and morphology. However, the F-doped TiO 2 exhibited the highest photocatalytic activity for the complete oxidation of acetaldehyde (ACE) even surpassing benchmarking Aeroxide TiO 2 (P25). In contrast, Cu-doped TiO 2 had a detrimental effect on the ACE photocatalytic oxidation. The proportion of native terminal hydroxyl groups, evaluated using high-field 1H MAS NMR, on the particle surface was varied by doping the TiO 2 with either Cu or F ions during FSP synthesis. A relationship, whereby decreased terminal hydroxyl group content corresponded to elevated acetaldehyde photodegradation, was subsequently uncovered. The findings were reinforced by studying the XPS O 1s photopeaks in the region attributed to surface hydroxyl groups.

Original languageEnglish
Pages (from-to)290-297
Number of pages8
JournalApplied Catalysis B: Environmental
Volume126
DOIs
Publication statusPublished - 25 Sep 2012
Externally publishedYes

Keywords

  • H MAS NMR
  • Acetaldehyde
  • Dopants
  • Flame spray pyrolysis
  • Photodegradation
  • Surface hydroxyl groups
  • Titanium dioxide

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