Colorimetric detection of Hg2+ based on the enhanced oxidase-mimic activity of CuO/Au@Cu3(BTC)2 triggered by Hg2

Min Yang; Jian Wang; Xuan Xue; Hechun Jiang

doi:10.1039/d4ra01953a

Colorimetric detection of Hg²⁺ based on the enhanced oxidase-mimic activity of CuO/Au@Cu₃(BTC)₂ triggered by Hg²

RSC Adv. 2024 Apr 26;14(20):13808-13816. doi: 10.1039/d4ra01953a. eCollection 2024 Apr 25.

Authors

Min Yang¹, Jian Wang², Xuan Xue¹, Hechun Jiang³

Affiliations

¹ School of Pharmacy, Anhui University of Chinese Medicine Hefei 230012 China.
² School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China prawang@sdu.edu.cn.
³ State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University Jinan 250100 China jianghechun@sdu.edu.cn.

Abstract

It is imperative to develop a rapid detection method for Hg²⁺ due to its harm to human health and the ecological environment. In this research, CuO/Au@Cu₃(BTC)₂ was synthesized through reducing HAuCl₄ by Cu_xO@Cu₃(BTC)₂, which was obtained by reducing Cu₃(BTC)₂ with hydrazine hydrate. The oxidase-mimic activity of CuO/Au@Cu₃(BTC)₂ can be enhanced by Hg²⁺ through forming a Au-Hg alloy. Therefore, a colorimetric method was designed for Hg²⁺ detection with a linear relationship in the 0.05-25 μM range and a limit of detection of 9.7 nM. This strategy exhibited a strong selectivity to Hg²⁺ and was applied in a real water sample with reliable recoveries. This work provides a possibility for the rapid detection of Hg²⁺.