1. Insights into the role of reactive oxygen species in photocatalytic H 2 O 2 generation and OTC removal over a novel BN/Zn 3 In 2 S 6 heterojunction.
- Author
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Fan QQ, Niu CG, Guo H, Huang DW, Dong ZT, Yang YY, Liu HY, Li L, and Qin MZ
- Abstract
Developing photocatalysts with superior performance to generate hydrogen peroxide (H
2 O2 ) and degrade oxytetracycline (OTC) is an effective strategy for the treatment of energy crisis and water purification. Herein, BN nanosheets were anchored onto the Zn3 In2 S6 microspheres for the research. Experimental and density functional theory (DFT) results demonstrate that due to different work functions and unique 2D/2D contact, the electron is spatially separated in BN/Zn3 In2 S6 nanocomposite, which increases the electron transfer efficiency from 43.7% (Zn3 In2 S6 ) to 55.6% (BN/ZIS-4). As a result, BN/ZIS-4 with optimal ratio of BN and Zn3 In2 S6 exhibits the highest OTC degradation efficiency (84.5%) and H2 O2 generation rate (115.5 μmol L-1 ) under visible light illumination, which is 2.2 and 2.9 times than that of pristine Zn3 In2 S6 . H2 O2 generation is dominated by two pathways: two-step single-electron process (O2 → ∙O2 - → H2 O2 ) and another way (O2 → ∙O2 - →1 O2 → H2 O2 ). In the process of degrading OTC, ∙O2 - ,1 O2 and ∙OH are regarded as the main active species. This work offers a new insight for designing efficient, stable and reusable photocatalysts to solve current environmental conundrums., (Copyright © 2022 Elsevier B.V. All rights reserved.)- Published
- 2022
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