Red Mud-Reduced Graphene Oxide Nanocomposites for the Electrochemical Sensing of Arsenic

Sujit Deshmukh, Debosmita Banerjee, Gourav Bhattacharya, Sam Fishlock, Anjam Barman, James McLaughlin, Susanta S Roy

Research output: Contribution to journalArticle

Abstract

This work demonstrates the applicability of red-mud-reduced graphene oxide (RM-rGO) nanocomposites (NCs) for the reliable and selective electrochemical (EC) detection of arsenic. The new NC material shows excellent anti-interference activity toward arsenic (As3+) ions with the cooccurrence of other common cations (Cd2+, Cr2+, Zn2+, Pb2+, and Hg2+). Especially, the NC is exceptionally selective for As3+ ions in the presence of Cu2+ ions, which is stated to be the main interfering agent in the EC detection of As3+. Under optimal experimental conditions, the new NC displays a high sensitivity (2.49 μA ppb-1) as well as a very low detection limit (0.07 ppb) toward As3+ detection. This excellent EC performance of the composite is accounted for by the high adsorption proficiency of hematite (Fe2O3)-phase-rich red mud nanoparticles and enhanced electron-transfer kinetics due to the presence of rGO.

Original languageEnglish
Pages (from-to)4084-4090
Number of pages7
JournalACS Applied Nano Materials
Volume3
Issue number5
Early online date10 Apr 2020
DOIs
Publication statusPublished - 22 May 2020

Keywords

  • arsenic
  • electrochemical detection
  • electron-transfer kinetics
  • hematite
  • red mud
  • sensitivity

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