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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nitrite Reduction Enhancement on Semiconducting Electrode Decorated with Copper(II) Aspirinate Complex

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Author(s):
Sayao, Fabiana A. ; da Silva Flor, Jader Barbosa ; Galvao Frem, Regina Celia ; Stulp, Simone ; Cardoso, Juliano C. ; Zanoni, Maria V. B.
Total Authors: 6
Document type: Journal article
Source: ELECTROCATALYSIS; v. 7, n. 6, p. 486-494, NOV 2016.
Web of Science Citations: 0
Abstract

The present work seeks to describe a new approach characterized by copper(II) aspirinate complex deposited onto nanotube TiO2 electrodes as mediator of electron transfer during nitrite reduction, aiming at achieving a faster removal of nitrite to nitrogen species oxides. Thin films of copper aspirinate ({[}Cu-2(asp)(4)]) on the Ti/TiO2 nanotube surface are easily obtained following multi-scans (100 cycles) recorded for the Ti/TiO2 electrode in 0.1 mol L-1 NaCl, pH 4, containing 5.0 x 10(-4) mol L-1 of the copper coordination compound. The complex showed high adherence while the cyclic voltammograms presented redox peaks at -0.15/+0.15 V, which was attributed to the reduction of Cu(II) to Cu(I). Following 5 min of treatment using photoelectrocatalysis on Ti/TiO2-{[}(Cu)(2)Asp(4)] electrode, a total removal of nitrite was observed, which was found to be at least four times faster compared to Ti/TiO2 electrode. Concomitantly, we also observed a relatively good conversion to nitrogen-containing gaseous species (56 %) besides the formation of 42 % of ammonia. The results, in effect, also indicate that nitrate and nitrite are not detectable in the treated solution up to levels of 0.5 mg L-1. The method under consideration has successfully accounted for the maximum limit of nitrite recommended in drinking water which has been set to 1 mg L-1. (AU)

FAPESP's process: 15/18109-4 - Contribution of Nanostructured Materials in Electroanalysis of pharmaceuticals and dyes, in the oxidation and reduction photoeletrocatalytic process of Inorganic and Organic Pollutants and Water Disinfection.
Grantee:Maria Valnice Boldrin
Support Opportunities: Regular Research Grants