Carbon sphere-enabled interfacial engineering of ultrafine CeO₂ for electrochemical detection of metol.

Authors

Qingli Lv, Qianqian Xu, Wenjing Du, Yuxin Xie, Zhonggang Liu, Zheng Guo

Published in

Mikrochimica acta. Volume 193. Issue 12. Nov 10, 2026. Epub Nov 10, 2026.

Abstract

Metol is widely used in photographic and dyeing processes, and its release into water raises concerns for environmental monitoring. In this work, ultrafine CeO₂ nanoparticles were immobilized on carbon spheres to construct a conductive sensing interface for electrochemical detection of metol. The carbon spheres help maintain CeO₂ dispersion and facilitate interfacial electron transfer, resulting in an enhanced oxidation response toward metol. Under optimized conditions, the CSs@CeO₂ GCE showed a linear response from 0.1 to 40 µM, with a sensitivity of 63.65 µA µM^-1 cm^-2 in the low-concentration range and a detection limit of 0.028 µM. The electrode also showed good repeatability, reproducibility, selectivity, and short-term storage stability. For tap water and two lake water samples, recoveries ranged from 97.0% to 107.8%, demonstrating acceptable accuracy in real sample analysis. These results show that the carbon-supported CeO₂ interface provides a practical platform for electrochemical determination of metol in environmental water.

PMID:
43007460
Bibliographic data and abstract were imported from PubMed on 11 Nov 2026.

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