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Facile synthesis of oxygen defective yolk-shell BiO2-x for visible-light-driven photocatalytic inactivation of Escherichia coli

Abstract

Oxygen defective yolk-shell BiO2-x spheres are successfully synthesized by a facile solvothermal method for the first time. The variances between the diffusion rate of the core and the formation rate of the shell, which are caused by the temperature gradient originating from the heating rate, result in the formation of BiO2-x spheres with different interior structures. The as-synthesized yolk-shell BiO2-x spheres possess distinctive oxygen vacancy, which are demonstrated by electron paramagnetic resonance and X-ray photoelectron spectral analyses. The oxygen vacancy with a high affinity for the molecular oxygen, and the enhanced light absorption ability resulted from the multireflection of the incident light within the interior voids, play key roles in the photocatalytic bacterial inactivation. Scavenger studies indicate that O2- and H2O2 are the major reactive species guaranteeing the prominent oxidation ability toward the bacterial cells. This study would not only provide direct evidence for the oxygen vacancy promoted photocatalytic bacterial inactivation, but also shed light on the design of highly efficient photocatalysts with intricate yolk-shell structures.

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Publication details

The article was received on 11 Jan 2018, accepted on 11 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA00336J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Facile synthesis of oxygen defective yolk-shell BiO2-x for visible-light-driven photocatalytic inactivation of Escherichia coli

    H. Sun, H. Y. Yip, Z. Jiang, L. Ye, I. Lo and P. K. Wong, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00336J

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