Issue 21, 2023

A single-atom cobalt integrated flexible sensor for simultaneous detection of dihydroxybenzene isomers

Abstract

Simultaneous detection of dihydroxybenzene isomers including hydroquinone (HQ), catechol (CC), and resorcinol (RS) is significant for water quality control as they are highly toxic and often coexist. However, it is a great challenge to realize their accurate and simultaneous detection due to their similarity in structure and properties. Herein, an electrochemical flexible strip with single-atom cobalt (SA-Co/NG) was constructed through high-resolution electrohydrodynamic (EHD) printing for dihydroxybenzene isomer's simultaneous detection. Results showed that the provided SA-Co/NG strip exhibited excellent sensing performance with reliable repeatability, reproducibility, long-term stability, and flexibility. Linear ranges of 0.50–31 745 μM, 0.50–5909 μM, and 0.50–153.5 μM were achieved for HQ, CC, and RS, respectively, with a detection limit of 0.164 μM. Based on the experimental data, the mechanism concerning SA-Co/NG catalytic activity towards HQ can be deduced, starting from the combination of Co* and OH in water, followed by the formation of Co–OH-dihydroxybenzene, and finally leading to O–H bond dissociation to generate benzoquinone. As for CC or RS, pyridinic N or C[double bond, length as m-dash]O synergistic with a single Co atom catalyzes their oxidation. Besides, the printed flexible SA-Co/NG strip further demonstrates the accurate and simultaneous detection of HQ, CC, and RS in textile wastewater, proposing a powerful practical application.

Graphical abstract: A single-atom cobalt integrated flexible sensor for simultaneous detection of dihydroxybenzene isomers

Supplementary files

Article information

Article type
Paper
Submitted
10 Nov 2022
Accepted
14 Apr 2023
First published
17 Apr 2023

Nanoscale, 2023,15, 9484-9495

A single-atom cobalt integrated flexible sensor for simultaneous detection of dihydroxybenzene isomers

G. X. Hu, Q. Rao, G. Li, Y. Zheng, Y. Liu, C. Guo, F. Li, F. X. Hu, H. B. Yang and F. Chen, Nanoscale, 2023, 15, 9484 DOI: 10.1039/D2NR06293C

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