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Graduate Center of the City University of New York
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Papers by Fidel Alejandro Cortez Lorenzo
Catalysis Today, 2017
Abstract Sulfur-doped anatase nanoparticles were synthesized using titanium isopropoxide and thio... more Abstract Sulfur-doped anatase nanoparticles were synthesized using titanium isopropoxide and thiourea, reactions were done through a microwave assisted hydrothermal method to control the morphology, crystallinity and the dimensions. Pure anatase was also obtained as a reference material for photocatalytic characterization. All synthesis reactions were carried out at 215°C, using a potency of 600W during 60 min. Crystalline phases were identified by XRD and by HRTEM the crystal structure was studied, and the dimensions of nanocrystal were determined. The images recorded were analyzed with a Digital Micrograph software. Subsequently, the synthesized anatase was used in order to obtain ceramics with controlled porosity through the modified gelcasting process. This process was performed in order to reduce the photocatalyst loss when organic compound degradation reactions were carried out. The anatase was mixed with polymers, dispersants and solvents to produce a reticulated gel which made the anatase easy to be molded and consequently, ceramic plates were formed. The ceramic porosity was observed with a SEM and their photocatalytic activities were evaluated by photodegradation reactions of methyl red dye in water solution. All these reactions lasted 3 h and samples were collected at different times during the reaction. Color removal was evaluated with UV–vis measurements following the color disappearing at 434 nm wavelength. Significant differences in photocatalytic properties were observed between doped and pure anatase despite the low concentration of sulfur (0.1% weight.)
Journal of Materials Science and Chemical Engineering, 2013
In this work, the crystal structure of titanium dioxide was studied, and the effect of the differ... more In this work, the crystal structure of titanium dioxide was studied, and the effect of the different synthesis routes on the microstructure and morphology of the nanostructures was analyzed. Samples characterization was carried out by X-ray diffraction by powders (XRD) to determine the different crystalline phases contented in the samples and using scanning electron microscopy (SEM), the morphology and topology of all samples were studied. XRD results were analyzed through Eva provided by Bruker to determine the average crystallite size. The results portrayed here showed that all the synthesis process produced anatase nanostructures with an average crystallite size smaller than 27 nm. Synthesized powders presented similar morphologies in all cases and they were homogeneous in their chemical composition.
Catalysis Today, 2017
Abstract Sulfur-doped anatase nanoparticles were synthesized using titanium isopropoxide and thio... more Abstract Sulfur-doped anatase nanoparticles were synthesized using titanium isopropoxide and thiourea, reactions were done through a microwave assisted hydrothermal method to control the morphology, crystallinity and the dimensions. Pure anatase was also obtained as a reference material for photocatalytic characterization. All synthesis reactions were carried out at 215°C, using a potency of 600W during 60 min. Crystalline phases were identified by XRD and by HRTEM the crystal structure was studied, and the dimensions of nanocrystal were determined. The images recorded were analyzed with a Digital Micrograph software. Subsequently, the synthesized anatase was used in order to obtain ceramics with controlled porosity through the modified gelcasting process. This process was performed in order to reduce the photocatalyst loss when organic compound degradation reactions were carried out. The anatase was mixed with polymers, dispersants and solvents to produce a reticulated gel which made the anatase easy to be molded and consequently, ceramic plates were formed. The ceramic porosity was observed with a SEM and their photocatalytic activities were evaluated by photodegradation reactions of methyl red dye in water solution. All these reactions lasted 3 h and samples were collected at different times during the reaction. Color removal was evaluated with UV–vis measurements following the color disappearing at 434 nm wavelength. Significant differences in photocatalytic properties were observed between doped and pure anatase despite the low concentration of sulfur (0.1% weight.)
Journal of Materials Science and Chemical Engineering, 2013
In this work, the crystal structure of titanium dioxide was studied, and the effect of the differ... more In this work, the crystal structure of titanium dioxide was studied, and the effect of the different synthesis routes on the microstructure and morphology of the nanostructures was analyzed. Samples characterization was carried out by X-ray diffraction by powders (XRD) to determine the different crystalline phases contented in the samples and using scanning electron microscopy (SEM), the morphology and topology of all samples were studied. XRD results were analyzed through Eva provided by Bruker to determine the average crystallite size. The results portrayed here showed that all the synthesis process produced anatase nanostructures with an average crystallite size smaller than 27 nm. Synthesized powders presented similar morphologies in all cases and they were homogeneous in their chemical composition.