Detection of Cd2+ based on Nano-Fe3O4/MoS2/Nafion/GCE sensor

• Published in: Analytical sciences Vol. 39; no. 9; pp. 1445 - 1454
• Main Authors: Gao, Jiaqi, Qiu, Chengjun, Qu, Wei, Zhuang, Yuan, Wang, Ping, Yan, Yirou, Wu, Yuxuan, Zeng, Zexi, Huang, Gao, Deng, Ruonan, Yan, Guohui, Yan, Jiaqi, Zhang, Ruoyu
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01-09-2023
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Original Paper; MoS; Cd; DPV; Nano-Fe; O
• ISSN: 0910-6340; 1348-2246; 1348-2246
• DOI: 10.1007/s44211-023-00359-9

It is necessary to detect cadmium ions in seawater with high sensitivity because the pollution of cadmium ions seriously endangers the health and life of human beings. Nano-Fe
3
O
4
/MoS
2
/Nafion modified glassy carbon electrode was prepared by a drop coating method. The electrocatalytic properties of Nano-Fe
3
O
4
/MoS
2
/Nafion were measured by Cyclic Voltammetry (CV). Differential Pulse Voltammetry (DPV) was used to study the stripping Voltammetry response of the modified electrode to Cd
2+
. The optimal conditions were determined: In 0.1 mol/L HAc-NaAc solution, the solution pH was 4.2, the deposition potential was − 1.0 V, and the deposition time was 720 s, the membrane thickness was 8 μL. Under the optimum condition, the linear relation of Cd
2+
concentration was found in the range of 5–300 μg/L, and the detection limit was 0.053 μg/L. The recovery of Cd
2+
in seawater ranged from 99.2 to 102.9%. A composite material with simple operation, rapid response and high sensitivity was constructed for the determination of Cd
2+
in seawater.
Graphical abstract