Author: LUIS ESCOBAR ALARCON

Desarrollo de fotocatalizadores basados en TiO2 en forma de película delgada para la degradación de moléculas orgánicas en solución acuosa

LUIS ESCOBAR ALARCON Dora Alicia Solís Casados (2020)

En este volumen ademas del capitulo, participo como editora invitada

TiO2 is used in a wide variety of applications, including photocatalysis in the environmental area for surface self-cleaning as well as air and water purification. In order to develop new materials with better photocatalytic response, it has been proposed the modification of TiO2 following different strategies. In this work, the basics of photocatalysis are summarized discussing the advantages of using photocatalysts in thin film form. The results of the preparation and characterization of zinc-modified TiO2 thin films using a novel synthesis route are presented; these indicate that depending on the Zn load incorporated into the film mixtures of TiO2 with Zn titanates are formed. The obtained results in the photocatalytic evaluation of the films in the degradation of the malachite green dye are shown, it was found that the films containing Zn have a better response practically doubling the degradation degree obtained with the sample without Zn. KEYWORDS: photocatalysis, TiO2, thin film, malachite green.

Article

fotocatálisis TiO2 Película Delgada verde de malaquita BIOLOGÍA Y QUÍMICA

Ag-modified vanadium oxide photocatalytic thin films deposited by a two parallel ablation plasmas configuration

LUIS ESCOBAR ALARCON Dora Alicia Solís Casados JAVIER SAUL ROMERO MARQUEZ EMMANUEL HARO PONIATOWSKI FERNANDO GONZALEZ ZAVALA (2018)

Articulo de colaboracion

The application of a two ablation plasmas configuration to deposit vanadium oxide thin films modified with different amounts of silver is reported. In this configuration, two parallel plasmas are produced ablating simultaneously two different targets, V and Ag, to form the Ag-modified vanadium oxide thin films. The ablation of the vanadium target is performed under constant conditions in all deposits, while the silver produced plasma is varied. The effect of the amount of Ag incorporated in the films on their compositional, morphological, structural, and photocatalytic properties is studied. The results reveal that films with variable Ag content from 0.6 to 17.2 at. % are obtained. Depending on the silver content, the samples show very different surface morphologies from smooth surfaces to acicular structures in films containing Ag. Raman spectra reveal that as the silver content is increased different vanadium oxides coexist and at the highest Ag content a silver vanadate is formed. The photocatalytic activity for the degradation of the Malachite Green dye under simulated solar light is determined. It is found that in general terms, films containing silver show a higher photocatalytic response than V2O5 films alone

CONACYT project CB-240998

Article

thin films laser ablation photocatalysis BIOLOGÍA Y QUÍMICA

Two-dimensional carbon nanostructures obtained by laser ablation in liquid: effect of an ultrasonic field

LUIS ESCOBAR ALARCON MANUEL EDUARDO ESPINOSA PESQUEIRA Dora Alicia Solís Casados Mónica Martínez Orts EMMANUEL HARO PONIATOWSKI (2019)

en este articulo se detallan procedimientos de síntesis de materiales novedosos obtenidos por ablación láser

The ablation of a carbon target immersed in deionized water, in absence and in presence of ultrasonic waves is reported, and the differences investigated. The obtained nanostructures are characterized by transmission electron microscopy, Raman spectroscopy and photoluminescence. Transmission electron images reveal that the produced carbon nanostructures, with and without ultrasonic excitation, are graphene-like sheets with improved quality in the first case. Samples prepared with ultrasounds show graphene layers with large sizes (several microns) and regular shapes, whereas the samples prepared without ultrasounds show smaller sizes and irregular shapes; additionally, some dispersed quasi-spherical nanoparticles are observed in the samples prepared without ultrasound. Photoluminescence measurements of the obtained nanostructures reveal emission in the blue spectral region.

conacyt

Article

graphene laser ablation BIOLOGÍA Y QUÍMICA