Details

Autor(en) / Beteiligte

• Paschoal, Fabiana Maria Monteiro
• Pepping, Greg
• Zanoni, Maria Valnice Boldrin
• Anderson, Marc A

Titel

Photoelectrocatalytic Removal of Bromate Using Ti/TiO2 Coated as a Photocathode

Ist Teil von

• Environmental science & technology, 2009-10, Vol.43 (19), p.7496-7502

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2009

Quelle

MEDLINE

Beschreibungen/Notizen

• These studies represent the rare use of a TiO2 material as a photocathode and the first application of photoelectrocatalysis for BrO3 − removal. Photoelectrocatalytic reduction of BrO3 − to Br− can reach 70% at neutral pH under an applied potential of −0.20 V versus SCE (saturated calomel electrode) after 75 min on the irradiated nanoporous thin-film TiO2-coated working electrode, which presented a flat band potential of −0.0274 V versus SCE. Regardless of the potential applied in these experiments, no BrO3 − removal was observed in the counter electrode compartment or during electrolysis or photocatalysis, confirming that reduction of BrO3 − to Br− requires the combination of a negative potential (ideally near −0.20 V) and ultraviolet irradiation of the Ti/TiO2 electrode. The process was selective for BrO3 − removal in that this process did not significantly reduce levels of Ca2+ and Mg2+ in drinking waters.