Simultaneous electrochemical detection of zinc and copper in fruit juice using Hg/CMWCNTs@ZIF-8 modified glassy carbon electrode

作者：Qin, Jiangyang; Li, Wanqing; Cai, Ke; Wang, Dandan; Peng, Chenxi; Luo, Lixia; Song, Shizhen; Mei, Yong; Wang, Yong^*

来源：Microporous and Mesoporous Materials, 2023, 360: 112721.

DOI：10.1016/j.micromeso.2023.112721

• Electrochemical sensors
• CMWCNTs
• ZIF-8
• Mercury film
• Metal ions

Due to their structure and functional characteristics, metal-organic frameworks (MOFs) have unique advantages in the adsorption and pre-enrichment of heavy metal ions. However, most MOFs have poor conductivity, which tremendously limits their application in the field of electrochemical sensing. In this study, a functionalised MOF composite-a carboxylated multi-walled carbon nanotube-zeolitic imidazolate framework material (CMWCNTs@ZIF-8)-was synthesized. An electrochemical sensing platform was constructed using a glassy carbon electrode (GCE) modified by the composite material and mercury film (Hg/CMWCNTs@ZIF-8/GCE). Under optimized conditions, when the concentrations of Zn2+ and Cu2+ were 0.05-1.0 mg L-1, the linear association with their corresponding peak currents was excellent. Furthermore, the detection limits (LODs) for Zn2+ and Cu2+ were 5.23 x 10-3 and 6.52 x 10-3 mg L-1, respectively. Subsequently, the content of Zn2+ and Cu2+ in actual juice beverages was successfully determined. This study not only constructed a novel sensing platform for the simultaneous and sensitive detection of heavy metal ions but also provided a novel method for the detection of Zn2+ and Cu2+ in fruit juice beverages, which is valuable for advancing the application of MOFs as electrochemical sensors.

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