Voltammetric sensing of Cd(II) at ZIF-8/GO modified electrode: Optimization and field measurements

Haitao Lu; Zijie Ke; Li Feng; Bingzhi Liu

doi:10.1016/j.chemosphere.2023.138710

Voltammetric sensing of Cd(II) at ZIF-8/GO modified electrode: Optimization and field measurements

Chemosphere. 2023 Jul:329:138710. doi: 10.1016/j.chemosphere.2023.138710. Epub 2023 Apr 15.

Authors

Haitao Lu¹, Zijie Ke¹, Li Feng², Bingzhi Liu¹

Affiliations

¹ School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China.
² School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China. Electronic address: fl19860314@126.com.

PMID: 37068613
DOI: 10.1016/j.chemosphere.2023.138710

Abstract

In this work, a metal-organic framework/graphene oxide (MOF(ZIF-8)/GO) nanocomposite was utilized for the electroanalysis of trace level of Cd(II) after modification of a cheap graphite rod electrode (GRE). After closed circuit process on the modified electrode, the differential pulse anodic stripping voltammetry (DPASV) technique was used for measuring of Cd(II). In optimal conditions, the sensor showed a linear dependence of current with concentration range 0.1-30 ppb for Cd(II). Moreover, limit of detection 0.03 ppb were obtained. Besides good selectivity, the sensor also indicated good reproducibility (below 5%). Moreover, the sensor showed satisfactory sensing performance in river, dam and wastewater samples with recovery ranging from 97.2% to 102.4%. Additionally, possible interfering cations were examined, but no significant interference was found. For the detection of trace Cd(II) in real matrices, this sensor illustrated other good merits like high stability, rapidity and simplicity.

Keywords: Cadmium(II); Graphite rod electrode; Metal organic framework; Voltammetric determination.

MeSH terms

Cadmium* / analysis
Electrodes
Reproducibility of Results

Substances

Cadmium