Issue 25, 2024

Visible ozone detection and removal in two-dimensional Mn(ii)-based metal–organic frameworks

Abstract

Atmospheric ozone (O3) has long been a threat to human health, however, rational design of dual-function materials for straightforward sensing and removal of trace O3 in the environment (air, water, etc.) remains challenging. Herein, we present a highly stable and hydrophobic two-dimensional Mn(II)-based metal–organic framework (denoted as BUT-82), which shows distinctive color change on exposure to O3 in air or in liquid water due to the oxidation of Mn2+. The O3 concentration could be quantified by analyzing the color changes of BUT-82 using UV/Vis spectroscopy or more facilely using smartphone photography, and the limits of detection for O3 of the two methods were 47 and 274 ppb, respectively. In addition, BUT-82 showed apparently higher capacity for the removal of O3 from dry or highly humid air flows than its starting materials, namely MnCl2·4H2O and a dicarboxylic acid ligand containing a long alkyl chain (3,3′-bis(dodecyloxy)-[1,1′-biphenyl]-4,4′-dicarboxylic acid). Isoreticular expansion of the MOF to tune its performance was also proven feasible. This work offers new insights into the development of new materials for O3 pollution control.

Graphical abstract: Visible ozone detection and removal in two-dimensional Mn(ii)-based metal–organic frameworks

Supplementary files

Article information

Article type
Paper
Submitted
21 Dec 2023
Accepted
02 Feb 2024
First published
02 Feb 2024

J. Mater. Chem. A, 2024,12, 15055-15062

Visible ozone detection and removal in two-dimensional Mn(II)-based metal–organic frameworks

C. Dong, T. He, W. Wu, G. Si, L. Xie and J. Li, J. Mater. Chem. A, 2024, 12, 15055 DOI: 10.1039/D3TA07938D

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