Glassy carbon electrode modified with poly(methyl orange) as an electrochemical platform for the determination of 4-nitrophenol at nanomolar levels

• Published in: Current applied physics Vol. 17; no. 8; pp. 1114 - 1119
• Main Authors: Giribabu, Krishnan, Haldorai, Yuvaraj, Rethinasabapathy, Muruganantham, Jang, Sung-Chan, Suresh, Ranganathan, Cho, Wan-Seob, Han, Young-Kyu, Roh, Changhyun, Huh, Yun Suk, Narayanan, Vengidusamy
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2017; 한국물리학회
• Subjects: 4-Nitrophenol; Differential pulse voltammetry; Electrochemical determination; Poly(methyl orange); 물리학; 4-Nitrophenol; Electrochemical determination; Poly(methyl orange); Differential pulse voltammetry
• ISSN: 1567-1739; 1878-1675; 1567-1739
• DOI: 10.1016/j.cap.2017.04.016

In this study, poly(methyl orange) (PMO) was synthesized by electrodeposition onto a glassy carbon electrode (GCE), and the resulting structure was examined for the determination of 4-nitrophenol (4-NP). Cyclic voltammetry revealed that the PMO-modified GCE (PMO/GCE) exhibited excellent electrocatalytic activity for the oxidation of 4-NP in a 0.5-M phosphate buffer solution. In contrast, the bare GCE showed no oxidation peak. Interestingly, PMO/GCE exhibited an oxidation peak at approximate 0.93 V, and the background current was higher than that of the bare GCE. Furthermore, the developed electrochemical sensor exhibited a linear relationship with the 4-NP concentration from 600 nM to 10 μM, and the limit of detection was 170 nM (signal/noise = 3). The sensor demonstrated excellent selectivity, good stability, and reproducibility. It was applied to the determination of 4-NP in water samples by the standard addition method and gave recoveries of 99.2–100.9%. •Highly sensitive electrochemical platform for the determination of 4-nitrophenol.•Excellent analytical performance for 4-nitrophenol with a detection limit of 170 nM.•Poly(methyl orange) plays vital role in electrocatalytic activity.