title: High temperature stability of anatase in titania-alumina semiconductors with enhanced photodegradation of 2, 4-dichlorophenoxyacetic acid.
abstract: The incorporation of aluminum acetylacetonate as alumina source during the gelation of titanium alkoxide reduces the nucleation sites for the formation of large rutile crystals on temperatures ranging from 400 to 800°C. As a result, the aggregation of anatase crystals is prevented at high temperature. A relationship among the specific surface area, pore size, energy band gap, crystalline structure and crystallite size as the most relevant parameters are evaluated and discussed. According to the results for the photocatalytic degradation of 2,4-dichlorophenoxyacetic acid, the specific surface area, pore size, Eg band gap are not determinant in the photocatalytic properties. It was found that the anatase crystallite size is the mores important parameter affecting the degradation efficiency.
authors: CICATA-IPN Unidad Querétaro, Cerro Blanco 141, Col. Colinas del Cimatario, C.P. 76090, Querétaro, Mexico.
authors: G
authors: G
authors: López-Granada
authors: J D O
authors: JD
authors: Barceinas-Sánchez
authors: R
authors: R
authors: López
authors: R
authors: R
authors: Gómez
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry / Q000528:radiation effects*; D006540:Herbicides / Q000737:chemistry*; D006358:Hot Temperature; D053758:Nanoparticles / Q000737:chemistry / Q000528:radiation effects*; D010782:Photolysis; D012666:Semiconductors; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D006540:Herbicides; C009495:titanium dioxide; D015084:2,4-Dichlorophenoxyacetic Acid; D014025:Titanium; D000537:Aluminum Oxide
keywords: Photocatalytic activity; Sol-gel process; Structural properties; Textural properties; Titania–alumina