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Photoelectrocatalytic bacterial inactivation of Acinetobacter baumannii on Cu2O/TiO2@Cu mesh photoanodes

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Abstract

A hybrid Cu2O/TiO2 composite loaded on a Cu mesh (Cu2O/TiO2@Cu mesh) was developed via a supercritical solvothermal route. A uniformly distributed Cu2O/TiO2 p–n hetero-junction was stably coated on a Cu mesh, benefiting the visible-light harvesting. In comparison to electrochemistry and visible-light photocatalysis, the photoelectrochemistry process on the photoanode of the Cu2O/TiO2@Cu mesh presented improved bacterial inactivation activity for Acinetobacter baumannii. By means of the main active species of ˙O2 radicals, the photoelectrocatalytic process on the Cu2O/TiO2@Cu mesh also realized complete leakage of K+ ions, much stronger mineralization of the cell membrane and more efficient elimination of the self-recovery function, finally leading to cell death. In comparison, the electrochemistry process only led to the leakage of K+ ions without inactivation of bacteria, and the visible-light photocatalysis process induced partial leakage of K+ ions and cell mineralization after the death of most bacteria.

Graphical abstract: Photoelectrocatalytic bacterial inactivation of Acinetobacter baumannii on Cu2O/TiO2@Cu mesh photoanodes

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Article information


Submitted
27 Jul 2020
Accepted
08 Sep 2020
First published
08 Sep 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Photoelectrocatalytic bacterial inactivation of Acinetobacter baumannii on Cu2O/TiO2@Cu mesh photoanodes

M. Ding, F. Shi, H. Zhu, Y. Yang, J. Zhong, L. Luo, Y. Huo and H. Li, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/D0CY01500H

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