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Photoelectrocatalytic Oxidation of Methyl Orange on a TiO 2 Nanotubular Anode Using a Flow Cell
Author(s) -
José Martín de Vidales María,
Mais Laura,
Sáez Cristina,
Cañizares Pablo,
Walsh Frank C.,
Rodrigo Manuel A.,
Rodrigues Christiane de Arruda,
Ponce de León Carlos
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500085
Subject(s) - methyl orange , titanium dioxide , anode , materials science , anodizing , photocatalysis , ethylene glycol , scanning electron microscope , chemical engineering , electrolyte , titanium , aqueous solution , coating , volumetric flow rate , electrochemistry , chemistry , composite material , electrode , metallurgy , organic chemistry , catalysis , engineering , aluminium , physics , quantum mechanics
Methyl orange from water was removed by photocatalytic anodic oxidation using a titanium dioxide array surface. The coating was prepared by anodizing a titanium plate in an ethylene glycol electrolyte‐containing NH 4 F followed by heat treatment to realize a photocatalytic surface under UV light. Scanning electron microscopy imaging showed that the array coating consisted of closely spaced nanotubes perpendicular to the titanium plate. The aqueous solution of methyl orange was circulated through a rectangular channel flow cell containing the coated anode. The effects of electrolyte flow rate and applied potential on the oxidation rate and efficiency were evaluated. At higher mean linear flow rates, the efficiency of the oxidation process improved, indicating a mass transport‐controlled process. At more positive applied potentials, the TiO 2 structure deteriorated resulting in a lower oxidation efficiency.