Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 5, Pages 2081-2088Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm13820k
Keywords
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Funding
- National Natural Science Foundation of China [21031001, 20971040, 91122018, 51102082, 21101060, 21001112]
- Cultivation Fund of the Key Scientific and Technical Innovation Project
- Chinese Academy of Sciences
- Ministry of Education of China [708029]
- China Postdoctoral Science Foundation [20110490154]
- Heilongjiang Provincial Education Department [11541283, 12511376]
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This work reports on a two-stage strategy towards the controlled Ag-AgBr deposition onto thorny anatase TiO2 tubes for excellent simulated solar-light photocatalytic activities. First, anatase TiO2 tubes with a thorny porous external surface were prepared using rod-like TiOSO4 center dot 2H(2)O as sacrificial template and a Ti source via a solvothermal process followed by annealing. The formation mechanism of the anatase TiO2 tubular precursor was investigated in detail. Then, the prepared anatase TiO2 tubes were used as a support for loading AgBr nanoparticles using the deposition-precipitation method, and the deposited AgBr was partially reduced to Ag via the calcination process to fabricate the Ag-AgBr/TiO2 tubular composites. X-Ray absorption near edge spectra (XANES), extend X-ray absorption fine structure (EXAFS) spectra and X-ray photoelectron spectroscopy (XPS) analyses indicated that both AgBr and Ag-0 components coexist in the systems. Compared with conventional nanoparticles and nanotubes, there exist abundant microcavities in the roughly parallel nanothorns of the tubes, which can contribute to the stable deposition of the Ag-AgBr nanoparticles and the formation of effective nanojunctions. These composites exhibited superior photocatalytic activity in the degradation of phenol under simulated solar-light irradiation.
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