A highly enhanced electrochemiluminescence system based on a novel Cu-MOF and its application in the determination of ferrous ion

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 856; p. 113498
• Main Authors: Tang, Tingting, Hao, Zeze, Yang, Hongjing, Nie, Fei, Zhang, Wenyan
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2020; Elsevier Science Ltd
• Subjects: Copper; Electrochemiluminescence; Electrodes; Ferrous ion; Ferrous ions; Glassy carbon; Metal-organic framework; Metal-organic frameworks; Potassium; Potassium persulfate; Stability analysis; Metal-organic framework; Electrochemiluminescence; Potassium persulfate; Ferrous ion
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2019.113498

A novel copper (Ⅱ) metal-organic framework ([Cu(L)(H2O)2]nCu-MOF) has been successfully synthesized by facile one step hydrothermal method. Modified the glassy carbon electrode (GCE) with this kind of Cu-MOF, a strong cathode electrochemiluminescence (ECL) signal was produced under the potential scan from 0.2 to −1.6 V in the potassium persulfate solution, which was about 8 times higher than that on the bare GCE electrode. The possible enhancement mechanism was studied in detail. The results showed that Cu (Ⅱ) in Cu-MOF catalyzed the reduction of potassium persulfate promoting the conversion of S2O82− into SO4•− and enhancing ECL signal intensively. Based on the inhibition effect of ferrous ion on this ECL signal, a sensitive ECL method for the determination of ferrous ion was developed within the linear range from 1.0 × 10−10 M to 3.0 × 10−8 M and the detection limit of 4 × 10−11 M. The ECL method showed high sensitivity, good stability, and excellent reproducibility and had been applied for analysis of ferrous ion in environmental water samples successfully. •A novel Cu-MOF has been successfully synthesized by hydrothermal method.•An enhanced ECL signal has been observed with Cu-MOF modified GCE in the K2S2O8 solution.•A sensitive ECL detection of ferrous ion was achieved with Cu-MOF-K2S2O8 system.