Real-time electrochemical determination of phenolic compounds after benzene oxidation

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2012-05, Vol.672, p.34-39
• Main Authors: Cesarino, Ivana, Moraes, Fernando C., Ferreira, Tanare C.R., Lanza, Marcos R.V., Machado, Sergio A.S.
• Format: Article
• Language: English
• Subjects: Benzene; byproducts; carbon; Carbon nanotubes; catechol; cobalt; detection limit; electrochemistry; electrodes; electrolysis; high performance liquid chromatography; hydroquinone; oxidation; phenol; Phenolic byproducts; resorcinol
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2012.03.006

[Display omitted] ► Sensor based on carbon nanotubes and cobalt phthalocyanine was developed. ► The total phenols byproducts formed after the benzene oxidation was determined. ► The obtained results were in full agreement with those from the HPLC procedure. A sensitive electrochemical sensor was successfully developed on multi-walled carbon nanotubes (MWCNT) and cobalt phthalocyanine (CoPc) modified glassy carbon electrode (GC), and used to detect byproducts formed after the electrolysis of benzene. The GC/MWCNT/CoPc electrode was applied in the detection of phenolic compounds using square wave voltammetry (SWV). The proposed sensor exhibited a sequence in the sensitivity of the tested phenols: catechol>hydroquinone>resorcinol>phenol and 1,4-benzoquinone. The detection limits for individual phenols were also calculated: catechol (15.62μgL−1), hydroquinone (17.91μgL−1), resorcinol (46.12μgL−1), phenol (58.83μgL−1) and 1,4-benzoquinone (13.75μgL−1). The proposed sensor was successfully applied in the determination of the total amount of phenols formed after the benzene oxidation, and the obtained results were in full agreement with those from the HPLC procedure.