Voltammetric determination of Auramine O with ZIF-67/Fe2O3/g-C3N4-modified electrode

• Published in: Journal of materials science. Materials in electronics Vol. 31; no. 22; pp. 19741 - 19755
• Main Authors: Hoa, Dang Thi Ngoc, Toan, Tran Thanh Tam, Mau, Tran Xuan, Hoan, Nguyen Thi Vuong, Tram, Tran Thi Nhat, Manh, Tran Duc, Nguyen, Vo Thang, Duyen, Vu Thi, Thong, Pham Le Minh, Khieu, Dinh Quang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-11-2020; Springer Nature B.V
• Subjects: Carbon nitride; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electrochemical analysis; Electrodes; Electron microscopy; Electrons; Materials Science; Microscopy; Optical and Electronic Materials; Particulate composites; Photoelectrons; Voltammetry
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-04499-w

In the present work, the synthesis of ZIF-67/Fe
2
O
3
/
g
-C
3
N
4
and its use for voltammetric determination of Auramine O are demonstrated. The resulting materials were characterized by means of X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption/desorption isotherm. The composite composes of polyhedron ZIF-67 particles evenly decorated with flocculent Fe
2
O
3
/g-C
3
N
4
and has a specific surface area of 600 m
2
.g
− 1
. Cyclic voltammetry and differential pulse voltammetry were performed to investigate the electrochemical behavior of Auramine O at ZIF-67/Fe
2
O
3
/
g
-C
3
N
4
-modified electrode. An excellent linear relationship between the anodic peak current and Auramine O concentration was found in the range of 1.9–17 µM under the optimized experimental conditions. The proposed electrochemical method exhibits high repeatability with a low detection limit of 0.65 µM. This method was successfully employed to the determine Auramine O in pickled vegetable samples, showing excellent agreement with the results obtained from HPLC analysis.