Photoelectrocatalytic Oxidation of Methyl Orange on a TiO2 Nanotubular Anode Using a Flow Cell

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Author(s):	Jose Martin de Vidales, Maria ; Mais, Laura ; Saez, Cristina ; Canizares, Pablo ; Walsh, Frank C. ; Rodrigo, Manuel A. ; Rodrigues, Christiane de Arruda ; de Leon, Carlos Ponce Total Authors: 8
Document type:	Journal article
Source:	CHEMICAL ENGINEERING & TECHNOLOGY; v. 39, n. 1, p. 7-pg., 2016-01-01.
Abstract
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 NH4F 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 TiO2 structure deteriorated resulting in a lower oxidation efficiency. (AU)

FAPESP's process:	11/51226-3 - Scale up photoelectrochemical reactor using nanocatalytic material for environmental remediation
Grantee:	Christiane de Arruda Rodrigues
Support Opportunities:	Regular Research Grants