Indirect electrocatalytic degradation of cyanide at Nitrogen-doped carbon nanotube electrodes

Jaclyn D. Wiggins-Camacho, Keith J. Stevenson

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Nitrogen-doped carbon nanotube (N-CNT) mat electrodes exhibit high catalytic activity toward O2 reduction, which can be exploited for the remediation of free cyanide (CN-). During the electrochemical O2 reduction process, the hydroperoxide anion (HO2 -) is formed and then reacts to chemically oxidize cyanide (CN -) to form cyanate (OCN-). The proposed electrochemical-chemical (EC) mechanism for CN- remediation at N-CNTs is supported by cyclic voltammetry and bulk electrolysis, and the formation of OCN- is confirmed via spectroscopic methods and electrochemical simulations. Our results indicate that by exploiting their catalytic behavior for O2 reduction, N-CNTs can efficiently convert toxic CN- to the nontoxic OCN-.

Original languageEnglish
Pages (from-to)3650-3656
Number of pages7
JournalEnvironmental Science and Technology
Volume45
Issue number8
DOIs
Publication statusPublished - 15 Apr 2011
Externally publishedYes

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