Enhanced Photocatalytic Activity of Titania by Co-Doping with Mo and W
Por:
Aviles-Garcia, Osmin, Espino-Valencia, Jaime, Romero-Romero, Rubi, Rico-Cerda, Jose Luis, Arroyo-Albiter, Manuel, Solis-Casados, Dora Alicia, Natividad-Rangel, Reyna
Publicada:
1 dic 2018
Resumen:
Various W and Mo co-doped titanium dioxide (TiO2) materials were
obtained through the EISA (Evaporation-Induced Self-Assembly) method and
then tested as photocatalysts in the degradation of 4-chlorophenol. The
synthesized materials were characterized by thermogravimetric analysis
(TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction
(XRD), Raman spectroscopy (RS), N-2 physisorption, UV-vis diffuse
reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS),
and transmission electron microscopy (TEM). The results showed that the
W-Mo-TiO2 catalysts have a high surface area of about 191 m(2)/g, and
the presence of an anatase crystalline phase. The co-doped materials
exhibited smaller crystallite sizes than those with one dopant, since
the crystallinity is inhibited by the presence of both species. In
addition, tungsten and molybdenum dopants are distributed and are
incorporated into the anatase structure of TiO2, due to changes in red
parameters and lattice expansion. Under our experimental conditions, the
co-doped TiO2 catalyst presented 46% more 4-chlorophenol degradation
than Degussa P25. The incorporation of two dopant cations in titania
improved its photocatalytic performance, which was attributed to a
cooperative effect by decreasing the recombination of photogenerated
charges, high radiation absorption capacity, high surface areas, and low
crystallinity. When TiO2 is co-doped with the same amount of both
cations (1 wt.%), the highest degradation and mineralization (97% and
74%, respectively) is achieved. Quinones were the main intermediates in
the 4-chlorophenol oxidation by W-Mo-TiO2 and 1,2,4-benzenetriol was
incompletely degraded.
Filiaciones:
Aviles-Garcia, Osmin:
Univ Michoacana, Fac Ingn Quim, Edif V1,Ciudad Univ, Morelia 58060, Michoacan, Mexico
Espino-Valencia, Jaime:
Univ Michoacana, Fac Ingn Quim, Edif V1,Ciudad Univ, Morelia 58060, Michoacan, Mexico
Romero-Romero, Rubi:
Univ Autonoma Estado Mexico, UAEMex UNAM, Ctr Conjunto Invest Quim Sustentable, Km 14-5 Carretera Toluca Atlacomulco, Toluca 50200, Mex, Mexico
Rico-Cerda, Jose Luis:
Univ Michoacana, Fac Ingn Quim, Edif V1,Ciudad Univ, Morelia 58060, Michoacan, Mexico
Arroyo-Albiter, Manuel:
Univ Michoacana, Fac Ingn Quim, Edif V1,Ciudad Univ, Morelia 58060, Michoacan, Mexico
Solis-Casados, Dora Alicia:
Univ Autonoma Estado Mexico, UAEMex UNAM, Ctr Conjunto Invest Quim Sustentable, Km 14-5 Carretera Toluca Atlacomulco, Toluca 50200, Mex, Mexico
Natividad-Rangel, Reyna:
Univ Autonoma Estado Mexico, UAEMex UNAM, Ctr Conjunto Invest Quim Sustentable, Km 14-5 Carretera Toluca Atlacomulco, Toluca 50200, Mex, Mexico
All Open Access, Gold
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