6533b82bfe1ef96bd128e2a6

RESEARCH PRODUCT

Hydrothermal Synthesis of Ionic Liquid [Bmim]OH-Modified TiO2 Nanoparticles with Enhanced Photocatalytic Activity under Visible Light

Holger LöweAnjie WangShaozheng HuXiang LiYao Wang

subject

TitaniumAnatasePhotoluminescenceLightPhotoelectron SpectroscopyOrganic ChemistryIonic LiquidsMetal NanoparticlesGeneral ChemistryPhotochemical ProcessesPhotochemistryBiochemistryCatalysischemistry.chemical_compoundUltraviolet visible spectroscopychemistryX-ray photoelectron spectroscopySpectroscopy Fourier Transform InfraredIonic liquidPhotocatalysisHydrothermal synthesisSpectrophotometry UltravioletHOMO/LUMO

description

TiO(2) nanocomposites modified with the ionic liquid [Bmim]OH are synthesized by a hydrothermal procedure. X-ray diffraction, Zeta-potential measurement, TEM, thermogravimetric analysis, photoluminescence, UV/Vis, FTIR, and X-ray photoelectron spectroscopy are used to characterize the TiO(2) nanocomposites. The TiO(2) nanocomposites consist of pure anatase particles of about 10 nm. The modification of [Bmim]OH on the surface of the TiO(2) particles extends the TiO(2) absorption edge to the visible-light region. The electrochemical redox potentials indicated that the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of [Bmim]OH match well with the valence band (VB) and conduction band (CB) of the TiO(2) semiconductor. [Bmim]OH-modified TiO(2) is much more active than pristine TiO(2) under visible-light irradiation in the photocatalytic degradation of methylene blue in aqueous solution. [Bmim]OH is chemically bonded to the surface Ti-OH of TiO(2) particles rather than adsorbed on the surface. A possible mechanism for the photocatalysis is proposed.

yearjournalcountryeditionlanguage
2010-04-10Chemistry - An Asian Journal
https://doi.org/10.1002/asia.200900629