Highly Sensitive and Selective Detection of Pb(II) by NH2−SiO2/Ru(bpy)32+−UiO66 based Solid‐state ECL Sensor. Issue 3 (25th October 2019)

• Record Type: Journal Article
• Authors: Shan, Xiaomeng; Pan, Tao; Pan, Yuting; Wang, Wenchang; Chen, Xiaohui; Shan, Xueling; Chen, Zhidong
• Is Part Of: Electroanalysis. Volume 32:Issue 3(2020)
• Page Start: 462
• Page End: 469
• Publication Date: 2019-10-25
• Subjects: Analytical methods -- Luminescence -- Pb(II) detection -- UiO66 -- NH2−SiO2; Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201900424
• Languages: English
• ISSNs: 1040-0397

Abstract

Abstract: In this study, a novel electrochemiluminescence (ECL) sensor for highly sensitive and selective detection of Pb(II) was developed based on Ru(bpy)3 2+ encapsulated UiO66 metal‐organic‐framework (Ru(bpy)3 2+ −UiO66 MOF) and −NH2 group functionalized silica (NH2 −SiO2 ). The NH2 −SiO2 with large surface area provided an excellent platform for the ECL sensor. As numerous exposed carboxyl groups were present on UiO66 backbone, the Ru(bpy)3 2+ −UiO66 could be steadily immobilized to NH2 −SiO2 by forming amide bonds. Meanwhile, the introduced UiO66 MOF which used for the encapsulation of Ru(bpy)3 2+, significantly enhanced the ECL efficiency of the proposed sensor, as it possessed a large specific surface area and porosity for the loading of Ru(bpy)3 2+ . Moreover, a high quenching effect on ECL intensity was obtained in the presence of Pb(II) in the electrolyte. Under the optimal conditions, the quenched ECL intensity showed a good linear relationship within Pb(II) concentration in the range from 1.0×10 −6 to 1.0×10 2 μM, with a detection limit of 1.0×10 −7 μM ( S / N =3). The proposed sensor for Pb(II) detection was simple in operation, rapid in testing, stable in signal, and showed a good anti‐interference ability to some other metal ions. Besides, its application for detecting Pb(II) in a real sample was also investigated here. This work provides a potential platform for metal ions detection in environmental monitoring field. Abstract : Highly Sensitive and Selective Detection of Pb(II) by NH2 −SiO2 /Ru(bpy)3 2+ −UiO66 based Solid‐state ECL Sensor