Details

Autor(en) / Beteiligte

• Sayão, Fabiana A.
• da Silva Flor, Jader Barbosa
• Frem, Regina Célia Galvão
• Stulp, Simone
• Cardoso, Juliano C.
• Zanoni, Maria V. B.

Titel

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

Ist Teil von

• Electrocatalysis, 2016-11, Vol.7 (6), p.486-494

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The present work seeks to describe a new approach characterized by copper(II) aspirinate complex deposited onto nanotube TiO 2 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/TiO 2 nanotube surface are easily obtained following multi-scans (100 cycles) recorded for the Ti/TiO 2 electrode in 0.1 mol L −1 NaCl, pH 4, containing 5.0 × 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/TiO 2 -[(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/TiO 2 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 . Graphical Abstract Nitrite reduction by Ti/TiO 2 NTs with Cu(II) aspirinate complex.