Evaluation of the Photocatalytic Activity of Copper Doped TiO2 nanoparticles for the Purification and/or Disinfection of Industrial Effluents
Por:
Pedroza-Herrera, Gladis, Medina-Ramirez, Iliana E., Lozano-Álvarez J.A., Rodil, Sandra E.
Publicada:
1 feb 2020
Resumen:
In this article, visible light active, copper doped TiO2 nanoparticles
are discussed as potential candidates for the tertiary treatment of
industrial effluents. Our aim was to develop sustainable photocatalytic
materials that exhibit excellent activity and biocompatibility. The
photocatalysts were prepared using a two-step procedure: solgel
synthesis followed by microwave hydrothermal treatment. Copper (Cu) was
chosen as doping agent because it has been previously reported that Cu
is a good doping element that improves the photocatalytic performance of
TiO2. The incorporation of Cu into the TiO2 matrix was demonstrated by X
ray photoelectron spectroscopy and a bandgap reduction down to 2.86 eV
was achieved at relatively low doping levels (nominal 2.0%). A moderate
photocatalytic activity was observed for the degradation of diclofenac
and for the removal of dissolved organic matter contained in an
industrial effluent. The removal efficiency of the nanoparticles
increased linearly with the amount of copper doping. For instance after
7 h of illumination, diclofenac degradation efficiencies of 21.41, 28.95
and 33.26% were observed for TiO(2)eCu (1.0, 1.5 and 2.0%)
respectively. Meanwhile, disinfection of the effluents was attained
within five hours of treatment under visible light, in our irradiation
conditions. Hydrogen peroxide improved the photocatalytic activity of
the nanoparticles since the release of Cu2+ ions give rise to a combined
degradation mechanism: photocatalysis + photo-Fenton. The lixiviation of
Cu2+ ions was demonstrated by atomic absorption spectroscopy. Moreover,
The Cu doped TiO2 nanostructures exhibited excellent antibacterial
properties against both gram negative and positive bacteria and do not
exert any cytotoxicity to human blood cells. The biocompatibility of the
Cu doped TiO2 nanoparticles combined with their photocatalytic activity
under room light illumination suits them as excellent candidates for the
development of sustainable environmental remediation technologies.
Filiaciones:
Pedroza-Herrera, Gladis:
Departamento de Química, Universidad Autónoma de Aguascalientes, Avenida Universidad No. 940, Ciudad Universitaria, Aguascalientes, Ags. 20131, Mexico
Univ Autonoma Aguascalientes, Dept Quim, Ave Univ 940,Ciudad Univ, Aguascalientes 20131, Aguascalientes, Mexico
Medina-Ramirez, Iliana E.:
Departamento de Química, Universidad Autónoma de Aguascalientes, Avenida Universidad No. 940, Ciudad Universitaria, Aguascalientes, Ags. 20131, Mexico
Univ Autonoma Aguascalientes, Dept Quim, Ave Univ 940,Ciudad Univ, Aguascalientes 20131, Aguascalientes, Mexico
Lozano-Álvarez J.A.:
Departamento de Ingeniería Bioquímica, Universidad Autónoma de Aguascalientes, Avenida Universidad No. 940, Ciudad Universitaria, Aguascalientes, Ags. 20131, Mexico
Rodil, Sandra E.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, México Cd. de México04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circutto Exterior S-N, Mexico Cd De Mexico 04510, Mexico
Univ Autonoma Aguascalientes, Dept Ingn Bioquim, Ave Univ 940,Ciudad Univ, Aguascalientes 20131, Aguascalientes, Mexico
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