Citation: FU Ping-Feng, ZHANG Peng-Yi. Low-Temperature Electrostatic Self-Assembly of Noble Metals on TiO₂ Nanostructured Films with Enhanced Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, ;2014, 30(5): 965-972. doi: 10.3866/PKU.WHXB201403171 shu

Low-Temperature Electrostatic Self-Assembly of Noble Metals on TiO₂ Nanostructured Films with Enhanced Photocatalytic Activity

FU Ping-Feng ¹ ,
ZHANG Peng-Yi ^2,

1.
1 School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China;
2 State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China

Received Date: 10 February 2014
Available Online: 17 March 2014
Fund Project:

Photoactive TiO₂ nanostructured films (i.e., nanoflowers and nanowires) have been directly synthesized on Ti sheets using an alkali-hydrothermal route. Ultrafine noble metals (i.e., Au, Pt, Pd) nanoparticles (NPs) were homogenously dispersed onto the TiO₂ nanostructures using a facile low temperature electrostatic self-assembly approach. The resulting noble-metal/TiO₂-nanostructured films supported on Ti sheets had an all-in-one structure with all of the virtues of a porous framework and enhanced photocatalytic activity. Ultra highresolution field-emission scanning electron microscopy (FESEM) revealed that the noble metal NPs were uniformly dispersed on the TiO₂ surface with od physical separation properties. The average sizes of the loaded Au, Pt, and Pd NPs were approximately 4.0, 2.0, and 10.0 nm, respectively. Noble metal NPs were deposited not only on the film surface but also in the interior framework of the TiO₂ films with a depth of more than 580 nm, as revealed by Auger electron spectroscopic (AES) in-depth profiling analysis. X-ray photoelectron spectroscopy (XPS) analysis revealed that the Pt and Pd NPs had been partially oxidized to PtO_abs and immobicompletely oxidized to PdO, respectively, whereas the Au NPs remained in a metallic state after being annealed in air at 300 ℃. During the electrostatic self-assembly process, the loading of the noble metal can be adjusted by controlling the assembly time and the colloidal pH value. The degradation of aqueous methyl orange showed that the Au/TiO₂ (or Pt/TiO₂)-nanostructured films possessed remarkably enhanced photocatalytic activity compared with pure TiO₂ films, and revealed that the metal NPs played a positive role in separating photogenerated hole-electron pairs. However, the deposited PdO species had no discernible impact on the activity of the TiO₂ nanostructures.
- Supported catalyst,
- Electrostatic self-assembly,
- Noble metal nanoparticle,
- TiO₂ nanostructured film,
- Photocatalytic activity
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Low-Temperature Electrostatic Self-Assembly of Noble Metals on TiO2 Nanostructured Films with Enhanced Photocatalytic Activity

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通讯作者: 陈斌, bchen63@163.com

Low-Temperature Electrostatic Self-Assembly of Noble Metals on TiO₂ Nanostructured Films with Enhanced Photocatalytic Activity