Structure and Properties Evolution of Nanostructed AgBr/TiO₂ Visible Light Photocatalyst in Cyclic Running

Abstract:

Nanostructured AgBr/TiO2 visible light photocatalyst was prepared through deposition-precipitation method with AgNO3, KBr and Ti(OBu )4 as the precursors. Though the photocatalyst showed a relatively high photocatalytic efficiency for degradation of methyl orange in water under visible light irradiation in the first cycle, its efficiency was obviously decreased in the subsequent cycles. X-ray diffraction indicated that there existed a dramatic crystalline growth of AgBr in the AgBr /TiO2 nanocomposite after visible light irradiation, which must increase the recombination rate of photo-generated electrons and holes and be responsible for the observed decrease in photocatalytic efficiency. Photo-induced crystalline growth of AgBr may be a limiting factor for the lifetime of AgBr/TiO2 visible light photocatalyst and more attention should be paid to it.

• Periodical: Advanced Materials Research (Volume 668)
• Pages: 338-342
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.668.338
• Online since: March 2013
• Authors: Le Wei Qin, Ke Feng He, Wan Ping Chen
• Keywords: AgBr/TiO₂, Crystalline Growth, Stability, Visible Light Photocatalyst

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