Ultrasensitive voltammetric detection of benzenediol isomers using reduced graphene oxide-azo dye decorated with gold nanoparticles

Mohammed Modawe Alshik Edris N 1 , Sulaiman Y 2

Affiliations 

  • 1 Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400, UPM, Serdang, Selangor, Malaysia; Department of Chemistry, Faculty of Science and Technology, Al-Neelain University, P.O. Box 12702, Khartoum, Sudan
  • 2 Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400, UPM, Serdang, Selangor, Malaysia; Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400, UPM, Serdang, Selangor, Malaysia. Electronic address: yusran@upm.edu.my
Ecotoxicol Environ Saf, 2020 Oct 15;203:111026.
PMID: 32888594 DOI: 10.1016/j.ecoenv.2020.111026

Abstract

The detection of phenolic compounds, i.e. resorcinol (RC) catechol (CC) and hydroquinone (HQ) are important due to their extremely hazardous impact and poor environmental degradation. In this work, a novel and sensitive composite of electrochemically reduced graphene oxide-poly(Procion Red MX-5B)/gold nanoparticles modified glassy carbon electrode (GCE/ERGO-poly(PR)/AuNPs) was assembled for voltammetric detection of benzenediol isomers (RC, CC, and HQ). The nanocomposite displayed high peak currents towards the oxidation of RC, HQ, and CC compared to non-modified GCE. The peak-to-peak separations were 0.44 and 0.10 V for RC-CC and CC-HQ, respectively. The limit of detections were 53, 53, and 79 nM for HQ, CC, and RC with sensitivities of 4.61, 4.38, and 0.56 μA/μM (S/N = 3), respectively. The nanocomposite displayed adequate reproducibility, besides good stability and acceptable recoveries for wastewater and cosmetic samples analyses.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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