Improvement of Bismuth-Based Catalysts for Visible-Light-Driven Photocatalytic Bacterial Disinfection
Invited conference paper presented and published in conference proceedings

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AbstractThe importance of bismuth (Bi)-based catalysts in photocatalytic treatments has been received considerable attention owing to its fascinating physico-chemical properties originated from its unique layered structures. However, existing reports on the Bi-based photocatalytic bacterial inactivation are rather limited and their performances are required improvement. Moreover, the exploitation of facile ways to make Bi-based catalysts to harvest a wide range of solar spectrum and maximize the usage of captured light for with high efficiency remains challenging, yet highly desirable.

Four studies on fabrication and characterization of Bi-based catalysts for visible-light-driven (VLD) photocatalytic bacterial inactivation conducted by the research group will be introduced. Firstly, BiOBr 2D nanosheets with a high percentage of exposed {001} and {010} facets were synthesized. The facet-dependent VLD photocatalytic bacterial inactivation activities and corresponding mechanisms of BiOBr nanosheets were investigated [1]. Secondly, boron atoms have been successfully doped into BiOBr crystals. The VLD photocatalytic bacterial inactivation activities under fluorescent tubes irradiation of BiOBr before and after doping were compared. The destruction process of bacterial cells and superior inactivation mechanisms were systematically investigated [2]. Thirdly, a simple alkali treatment approach was applied to obtain brown color BiOBr nanosheets. Bi2O4 nanoparticles were in situ formed due to a combined action of NaOH-induced dehalogenation and light triggered photoexcited hole oxidation processes on the surface of BiOBr nanosheets. The brown BiOBr showed exceptional enhancement in VLD photocatalytic bacterial disinfection [3]. Finally, an oxygen defective yolk-shell BiO2-x spheres are successfully synthesized by a facile solvothermal method for the first time [4]. The as-synthesized yolk-shell BiO2-x spheres possess distinctive oxygen vacancy with a high affinity for the molecular oxygen, and the enhanced light absorption ability resulted from the multi-reflection of the incident light within the interior voids, play key roles to enhance VLD photocatalytic bacterial inactivation.
All Author(s) ListWu Dan, Sun Hongli, Ye Liqun, Wang Bo, Jiang Zhifeng, Wong Po Keung
Name of ConferenceChinese Syposium on Photocatalysis Materials
Start Date of Conference26/07/2018
End Date of Conference29/07/2018
Place of ConferenceWuhan
Country/Region of ConferenceChina
Proceedings TitleChinese Syposium on Photocatalysis Materials
Place of PublicationWuhan
Pages1 - 1
LanguagesEnglish-United States
KeywordsBismuth-based catalysts, Visible-light-driven photocatalysis, Bacterial disinfection

Last updated on 2018-07-11 at 11:57