Fabrication of MOF-177 for electrochemical detection of toxic $$\hbox {Pb}^{2+}$$ and $$\hbox {Cd}^{2+}$$ ions

Abstract

We have studied the electrochemical behaviour of room-temperature synthesized MOF-177. The MOF-177 sample was characterized by various techniques like Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray, powder X-ray diffraction, nuclear magnetic resonance and CHNS elemental analysis. The MOF-177 electrode was prepared and electrochemical performance was carried out to explore the electrical activity of MOF-177. Cyclic voltammetry studies were performed in 0.05 M K 4 Fe(CN) 6 solution and electrochemical sensing experiments were performed in 0.05 M H 2 SO 4 and pH 7 buffer solution. A significantly increased electron transfer property has been observed and it has been explored for the electrochemical detection of heavy metal ions. The MOF-177/cp electrode has shown excellent sensitivity towards toxic heavy metal ions such as Pb 2+ and Cd 2+ at the limit of detection of 0.004 and 0.03 μM, respectively.

Chelated Zn–Metal–Organic Frameworks: Synthesis, Crystal Structure and Electrochemical Energy Storage

“…Also, 1105 cm −1 is the specific absorption peak about the C-N vibrations, and the absorption bands at 682 cm −1 and 722 cm −1 in the spectrum of the Zn(II) MOF are assigned to stretching vibrations of zinc-oxygen bonds, namely C=O → Zn and HO → Zn respectively. The peak at 400 cm −1 is assigned for the Zn-O vibrations involving the water molecules [20][21][22][23]. Also, all explained bands in the IR spectrum are strongly in agreement with the S-XRD structure of Zn-MOF (Fig.…”

“…The chelated Zn-MOF electrode (working electrode) for the electrochemical studies was prepared by mechanical grinding the mixture of prepared MOF (70%), carbon black (20%), and polytetrafluoroethylene (10%). The obtained slurry was then covered onto a nickel mesh conductor (1 cm × 1 cm) and dried at room temperature for 24 h [20]. Subsequently, it was pressed and obtained as the final electrode material.…”

A Short Review on Synthesis and Applications of Zinc Based Metal Organic Frameworks

“…They concluded with the help of the obtained results and electrochemical behaviour of the ZnMOF/ETH500/nafion modified GCE that these MOFs can have a promising future as electrode materials for direct electrochemical sensing. Sangeetha S. Patel, G. Krishnamurthy and Sabine Foro [52,53] reported synthesis, crystal structure and electrochemical energy storage for some chelated Zn-metal-organic frameworks. They synthesized the chelated Zn-EDTA metalorganic framework (Zn-MOF) by an eco-friendly hydrothermal route at 160 °C and this product was confirmed by ATRIR, SEM, SXRD, TGA, and BET techniques.…”

Recent Electrochemical Applications of Metal–Organic Framework-Based Materials

“…Following CV experiments conducted in 0.05 M K 4 Fe­(CN) 6 and electrochemical sensing experiments performed in 0.05 M H 2 SO 4 and a buffer solution with pH = 7, greater transfer of electrons was observed for the MOF-177-modified electrode. Additionally, toxic heavy metal ions can also be detected using this system as the MOF-177/CPE exhibits very good sensitivity toward metal ions such as Cd 2+ and Pb 2+ with LOD values of 0.004 and 0.03 μM, respectively …”

“…Additionally, toxic heavy metal ions can also be detected using this system as the MOF-177/CPE exhibits very good sensitivity toward metal ions such as Cd 2+ and Pb 2+ with LOD values of 0.004 and 0.03 μM, respectively. 66 3.2. MOF Composites.…”