Artículos de revistas
Photoelectrocatalytic degradation of Remazol Brilliant Orange 3R on titanium dioxide thin-film electrodes
Fecha
2003-04-21Registro en:
Journal of Photochemistry and Photobiology A: Chemistry, v. 157, n. 1, p. 55-63, 2003.
1010-6030
10.1016/S1010-6030(02)00320-9
2-s2.0-0037459937
0000-0002-2296-1393
Autor
Universidade Estadual Paulista (Unesp)
Fundacao Educacional de Barretos
University of Wisconsin-Madison
Institución
Resumen
Degradation of reactive dye Remazol Brilliant Orange 3R (RBO) has been performed using photoeletrocatalysis. A biased potential is applied across a titanium dioxide thin-film photoelectrode illuminated by UV light. It is suggested that charges photogenerated at the electrode surface give rise to chlorine generation and powerful oxidants (OH) that causes the dye solution to decolorize. Rate constants calculated from color decay versus time reveal a first-order reaction up to 5.0×10-5 mol l-1 in dye concentration. The best experimental conditions were found to be pH 6.0 and 1.0 mol l-1 NaCl when the photoelectrode was biased at +1V (versus SCE). Almost complete mineralization of the dye content (70% TOC reduction) was achieved in a 3-h period using these conditions. Effects of other electrolytes, dye concentration and applied potentials also have been investigated and are discussed. © 2003 Elsevier Science B.V. All rights reserved.