Direct Amorphous-structure Analysis: How are Surface/Bulk Structure and Activity of Titania Photocatalyst Particles Changed by Milling?
Guangyi Chen, Mai Takashima, Bunsho Ohtani
Abstract
Abstract Changes in surface and bulk structures of rutile titania particles induced by braying up to 10 d and post calcination in air at 773 K were analyzed by reversed double-beam photoacoustic spectroscopy. The observed energy-resolved distribution of electron traps indicated that the surface was amorphized by braying to give rutile-core amorphous-shell structure and the amorphous layer was partly recrystallized by post-calcination leaving grain boundaries in the surface layers, both of which may cause the observed markedly decreased photocatalytic activities.
Topics & Concepts
Amorphous solidCalcinationRutileChemistryPhotocatalysisChemical engineeringSurface layerMineralogyLayer (electronics)CrystallographyCatalysisOrganic chemistryEngineeringBiochemistryAdvanced Photocatalysis TechniquesTiO2 Photocatalysis and Solar CellsCopper-based nanomaterials and applications