Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 6, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106534
Keywords
cadmium ions; metal-organic framework; metal ions; electrochemical detection; cyclic voltammetry; differential pulse voltammetry
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Funding
- Deanship of Scientific Research at King Khalid University [R.G.P.2/171/42]
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A simple and on-site detection technique for Cd2+ using an electrochemical sensor based on multi-walled carbon nanotubes and copper metal-organic framework was synthesized via one-pot hydrothermal reaction. The sensor showed excellent selectivity, stability, and repeatability, with a detection limit of 0.275 nM and linear calibration curves from 0.2 to 10 μM. The well-designed sensor demonstrated promising potential for on-site monitoring of Cd2+ in tap water.
Designing a simple and on-site detection technique for Cd2+ is highly demanding. In the current study, an electrochemical sensor based on multi-walled carbon nanotubes (CNTs) and copper metal-organic framework (Cu-MOF) was synthesized via one-pot hydrothermal reaction for the rapid and economical monitoring of the Cd2+ level. The structure, morphology and physical properties of prepared CNT-Cu-MOF were characterized by different physicochemical techniques. The surface of the glassy carbon electrode was modified with CNT-Cu-MOF to detect Cd2+ in 01 M phosphate Buffer. The detection limit was found to be 0.275 nM (S/N = 3), with linear calibration curves ranging from 0.2 to 10 mu M. Furthermore, the developed electrochemical sensor demonstrated excellent selectivity, stability, and repeatability. The recovery of the CNT-Cu-MOF is found to be 100.4% in a real-time sample of tap-water. The well-designed sensor employs a promising approach for on-site monitoring of Cd2+ in tap water.
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