Highly sensitive electrochemical sensor for lead ions based on Bi-MOF/conducting polymer composites

Saleem Ullah Saleem; Zhibin Pang; Yanhua Liu; Jing Sui; Geoffrey I N Waterhouse; Zhiming Zhang; Liangmin Yu

doi:10.1016/j.chemosphere.2024.144019

Highly sensitive electrochemical sensor for lead ions based on Bi-MOF/conducting polymer composites

Chemosphere. 2024 Dec 28:370:144019. doi: 10.1016/j.chemosphere.2024.144019. Online ahead of print.

Authors

Saleem Ullah Saleem¹, Zhibin Pang¹, Yanhua Liu¹, Jing Sui², Geoffrey I N Waterhouse³, Zhiming Zhang⁴, Liangmin Yu⁵

Affiliations

¹ Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China.
² Key Laboratory of Rubber- Plastics, Ministry of Education/Shandong Provincial Laboratory of Rubber- Plastics, Qingdao University of Science and Technology, Qingdao, 266043, China.
³ School of Chemical Sciences, The University of Auckland, Auckland, 1142, New Zealand.
⁴ Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China. Electronic address: [email protected].
⁵ Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China. Electronic address: [email protected].

PMID: 39724983
DOI: 10.1016/j.chemosphere.2024.144019

Abstract

Herein, conductive polyaniline (PANI) was chemically polymerized on the surface of a bismuth-based metal-organic framework (Bi-MOF) to form conductive PANI@Bi-MOF composites. FT-IR and PXRD measurements verified the successful production of PANI@Bi-MOF, whereas SEM, TEM, and EDAX mapping demonstrated that PANI was uniformly coated on the surface of Bi-MOF. The resulting PANI@Bi-MOF composites were characterized by cyclic voltammetry (CV and electrochemical impedance spectroscopy (EIS), then used to develop a sensitive electrochemical sensor for the detection of lead ions based on differential pulse anodic stripping voltammetry (DPASV). The developed sensor possessed a low detection limit of 0.0108 μg/L and a wide linear detection range (0.025-20 μg/L). The sensor was successfully applied for the detection of Pb²⁺ in real water samples, showing negligible response to other coexisting metal cations. This work offers a feasible approach for detecting Pb²⁺ ions in water.

Keywords: Electrochemical characterization; Metal-organic framework (Bi-MOF); Nanocomposite; Pb(2+) ions; Polyaniline (PANI).