Hierarchical nanostructured 3D flowerlike BiOClxBr1-x semiconductors with exceptional visible light photocatalytic activity

Hani Gnayem, Yoel Sasson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

251 Scopus citations

Abstract

With careful rational optimization and substantial simplification of the syntheses of the recently reported alloys BiO(ClxBr1-x), we fabricated, via a very simple procedure and at room temperature, a unique visible-light-driven photocatalyst with excellent activity. The alloy BiOCl 0.875Br0.125 totally decomposed 15 mg/L aqueous Rhodamine B solution within 120 s upon irradiation with visible light (λ > 422 nm). The transparent substrate acetophenone was also swiftly destroyed under the above conditions. The catalyst maintained partial activity even after switching off the light source. Initial mechanistic studies clearly suggest that the mode of action of these materials is fundamentally different from previously reported photocatalytic mechanisms. Evidently, the putative molecular mechanism does not engage dye photosensitization or oxygen radicals.

Original languageAmerican English
Pages (from-to)186-191
Number of pages6
JournalACS Catalysis
Volume3
Issue number2
DOIs
StatePublished - 1 Feb 2013

Keywords

  • Rhodamine B decomposition
  • acetophenone decomposition
  • bismuth mixed oxyhalides
  • visible light photocatalyst

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