Article

Journal of Sol-Gel Science and Technology

, Volume 22, Issue 1, pp 99-107

Photocatalytic Activity in the 2,4-Dinitroaniline Decomposition Over TiO2 Sol-Gel Derived Catalysts

  • Tessy LopezAffiliated withDepartment of Chemistry, Universidad Autonoma Metropolitana-Iztapalapa
  • , R. GomezAffiliated withDepartment of Chemistry, Universidad Autonoma Metropolitana-Iztapalapa
  • , E. SanchezAffiliated withTecnologico de Estudios Superiores de Ecatepec
  • , F. TzompantziAffiliated withTecnologico de Estudios Superiores de Ecatepec
  • , L. VeraAffiliated withTecnologico de Estudios Superiores de Ecatepec

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Abstract

Titania was prepared by the sol-gel method from titanium alkoxide. Depending on the pH of the gelling solution, specific surface areas between 88 and 10 m2/g were obtained. The band gap (E g) of the samples was found between 3.05 and 3.32 eV. In samples gelled at pH5 and 9 and calcined at 400°C only anatase phase is observed, while for pH3 and pH7 brookite, anatase and rutile or anatase-rutile phases coexist. It was found that the photoactivity in the 2,4-dinitroanailine decomposition depends on the E g and on the crystalline phases. The highest activity corresponds to the catalysts having the lowest E g and more than one crystalline phases co-existing.

2 4-dinitroaniline decomposition titania band gap titania x-ray diffraction titania sol-gel preparation