Page 134 - LAS CIENCIAS AMBIENTALES EN EL ANTROPOCENO - DIGITAL(1)

área superficial y la energía de activación del material. El material sintetizado
del material. Con este material, se con nivel de dopaje 0,2 N/Ti calcinado
fabricaron películas delgadas para a 450°C puede ser empleado en la
ser empleadas en un reactor solar a construcción de fotoreactores solares,
escala piloto. Las películas fabricadas para la degradación de contaminantes.
fueron evaluadas degradando azul de De esta forma, se podría extender la
metileno, bajo radiación solar. Estas aplicación de los procesos fotocatalíticos
películas llegaron a degradar hasta un a una escala mayor a la del laboratorio,
64%, en tiempo de 4h. La disminución ya que se reducen, significativamente,
de la actividad fotocatalítica, se atribuye, los costos de operación, al hacer uso un
principalmente, a la disminución del área uso eficiente del recurso solar.
superficial por el proceso de fijación

SUMMARY

iO2 is the most studied nanoparticles were characterized attributed to a synergistic effect
semiconductor material in through XRD, FTIR, BET, and diffuse between the material’s crystal size,
Tapplications of photocatalytic reflectance. The XRD analyzes showed surface area and the activation energy of
degradation of contaminants in the the presence of anatase as the only the material. With this material, thin films
laboratory; however, its use in a wider crystalline phase formed at 450°C, while were made to be used in a pilot-scale
field is still limited because it only at 650°C the formation of polycrystalline solar reactor. The manufactured films
exhibits reactivity under UV light. This materials with anatase and rutile phases were evaluated by degrading methylene
is why research has been developed was observed. The IR spectra indicate blue under solar radiation. These films
around shifting its absorption spectrum the insertion of nitrogen in the doped degrade up to 64% in a time of 4h. The
towards the visible region and thus taking materials evidenced by the appearance decrease in photocatalytic activity is
advantage of incident solar radiation on of a peak close to 1108 m-1 assigned mainly attributed to the decrease in
earth. Among these methods, doping to the -N-O- bond within the materials. surface area due to the process of fixing
with different elements such as copper, BET area studies showed that N-TiO2 the material. The synthesized material
iron, vanadium, nitrogen, among materials have higher surface area and with doping level 0.2N/Ti calcined at
others, stands out. Taking into account porosity with respect to undoped TiO2. 450°C can be used in the construction of
the above, nitrogen doped TiO2 was The analysis of the diffuse reflectance solar photoreactors for the degradation
synthesized through a sol-gel method spectra showed that the doped materials of pollutants. In this way, the application
using triethylamine and titanium present absorption in the visible region. of photocatalytic processes could be
isopropoxide as sources of nitrogen and In order to evaluate the photocatalytic extended to a scale larger than that of
titanium respectively. The N / Ti molar activity of the synthesized materials, the laboratory, since operating costs are
ratio was varied in the synthesis with the catalytic degradation of methylene significantly reduced by making efficient
values of 0, 0.1, 0.2 and 0.5 to obtain blue was carried out under visible light. use of the solar resource.
TiO2, with different levels of nitrogen The material with a doping ratio of 0.2
doping. Additionally, the powders calcined at 450°C presented the best
obtained from each synthesis were photocatalytic activity, degrading up
subjected to calcination temperatures to 72% of methylene blue in a period
of 450°C and 650°C. The resulting of 4h under visible light. This is mainly

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