Carbon nanotube-based electrodes for detection of low-ppb level hexavalent chromium using amperometry

Chengwei Wang, Candace K. Chan

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Carbon nanotube (CNT)-based electrodes, prepared using a printable technique,were investigated for the electrochemical detection of hexavalent chromium (Cr(VI)). CNT pastes were coated onto paper substrates and commercially available screen-printed electrodes and used as amperometric sensors for Cr(VI). The CNT electrodes showed electrochemical current responses as high as 500 nA/ppb Cr(VI) and limit of detection as low as 5 ppb when a large area electrode was used. The CNT-modified, screen-printed electrodes showed good selectivity to Cr(VI) and were effective for quantifying the Cr(VI) levels in cooling tower blowdown water. A selective H2O2 reduction technique was also applied to Cr(VI) detection and integrated into amperometric detection in a flow cell. These studies show that CNT-based electrodes can be promising for field applications and real-time monitoring of low-level Cr(VI) in power plant waters.

Original languageEnglish
Pages (from-to)M3026-M3031
JournalECS Journal of Solid State Science and Technology
Volume5
Issue number8
DOIs
Publication statusPublished - Jan 1 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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