Designing 0D/2D S-scheme Heterojunction over Polymeric Carbon Nitride for Visible-Light Photocatalytic Inactivation of Bacteria.

By Pengfei Xia, Shaowen Cao, Bicheng Zhu, Mingjin Liu, Miusi Shi, Jiaguo Yu, Yufeng Zhang. Angewandte Chemie, 2020

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Constructing heterojunctions between two semiconductors with matched band structure is one of the most effective strategies to acquire high-efficiency photocatalysts. S-scheme heterojunction system, as an innovative photocatalytic system, has shown great potential in facilitating separation and transfer of photogenerated carriers, as well as acquiring strong photoredox ability. Herein, a 0D/2D S-scheme heterojunction material involving CeO 2 quantum dots and polymeric carbon nitride (CeO 2 /PCN) is designed and constructed via in-situ wet chemistry with subsequent heat treatment. This S-scheme heterojunction material shows high-efficiency photocatalytic sterilization rate (88.1%) towards Staphylococcus Aureus (S.aureus) under visible-light irradiation (λ ≥ 420 nm), which is 2.7 and 8.2 times that of pure CeO 2 (32.2%) and PCN (10.7%), respectively. Strong evidence of S-scheme charge transfer path is verified by theoretical calculation, in-situ irradiated X-ray photoelectron spectroscopy (ISI-XPS), and electron paramagnetic resonance (EPR) analyses. This work provides a robust way for tailoring the performance and interpreting the mechanism of heterojunction-based photocatalytic system for high-performance photocatalysis.

Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/a28df172d4b0238ea057579905b6b0ee8bd7ba95