A novel, eco-friendly multi-walled carbon nanotubes functionalized copper metal-organic framework for ultrasensitive potentiometric detection of cadmium ions. Issue 6 (December 2021)

• Record Type: Journal Article
• Authors: Singh, Sima; Numan, Arshid; Somaily, H.H.; Dawsari, Mona M.A.; Alqarni, Mohammed Hamed Saeed; Alam, Aftab; Kumar, Piyush
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 6(2021)
• Publication Date: 2021-12
• Subjects: cadmium ions -- metal-organic framework -- metal ions -- electrochemical detection -- cyclic voltammetry -- differential pulse voltammetry; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106534
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Designing a simple and on-site detection technique for Cd 2+ 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 Cd 2+ 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 Cd 2+ 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 μM. 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 Cd 2+ in tap water. Graphical Abstract: ga1 Highlights: A porous nanocomposite of CNT-Cu-MOF was synthesised and characterized for structure, morphology and physical properties. The electrochemically determined LOD was found near 0.275 nM (S/N=3) with linear calibration curves range from 0.2–10 μM. The new sensor shows excellent sensitivity, stability, and analytical precision.