Issue 4, 2022

Ultrathin Bi4O5Br2 nanosheets with surface oxygen vacancies and strong interaction with Bi2O2CO3 for highly efficient removal of water contaminants

Abstract

Ultrathin Bi4O5Br2 nanosheets with about a 10 nm thickness were synthesized by in situ intergrowth with Bi2O2CO3 sheets at room temperature. The degradation rates of organic pollutants on the catalyst were 28.1, 9.5, and 8.5 times higher than those on P25, N-TiO2 and 50 nm thick Bi4O5Br2 under a visible LED. The supreme catalytic activity was confirmed to be due to the significantly enhanced charge separation and transfer by surface oxygen vacancies on the ultrathin nanosheets, and the facilitated adsorption–degradation process at the solid–liquid micro-interface. The photogenerated electrons were demonstrated to be trapped on surface OVs to reduce surface adsorbed O2 into O2˙. Meanwhile, the photogenerated holes were effectively utilized to directly oxidize organic pollutants at the catalyst surface. FTIR, HPLC-Q-TOF-MS and IC analysis confirmed that diclofenac (DCF) was degraded at the catalyst surface through decarboxylation, dechloridation and C–N cleavage, and further mineralized in reaction solution. In addition, the developed catalyst can work at different pH values (5–10) and was stable after eight reaction cycles, showing good potential in practical application.

Graphical abstract: Ultrathin Bi4O5Br2 nanosheets with surface oxygen vacancies and strong interaction with Bi2O2CO3 for highly efficient removal of water contaminants

Supplementary files

Article information

Article type
Paper
Submitted
08 நவம்பர் 2021
Accepted
06 பிப்ரவரி 2022
First published
09 பிப்ரவரி 2022

Environ. Sci.: Nano, 2022,9, 1341-1352

Ultrathin Bi4O5Br2 nanosheets with surface oxygen vacancies and strong interaction with Bi2O2CO3 for highly efficient removal of water contaminants

L. Zhang, Z. Wang, T. Li, C. Hu and M. Yang, Environ. Sci.: Nano, 2022, 9, 1341 DOI: 10.1039/D1EN01024G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements