Browsing by Author "Gómez Costa , Marcos Bruno"
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Item Direct synthesis of ordered mesoporous carbon applied in hydrogen storage(Springer Science+Business Media, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoIn this work, we present a direct, novel and low cost method for the preparation of an ordered mesoporous carbon (OMC). OMC was successfully synthesized by the carbonization of the silica/triblock copolymer/sucrose composite in the presence of sulfuric acid. The resulting material was characterized by XRD, N2 sorption analysis and TEM techniques. The novel synthesis technique improved significantly the H2 storage properties (3.78 wt%) compared with that of CMK-3 synthesized using the nanocasting strategy (2.2 wt%) at 77 K and 10 bar.Item Drug release system. Nanostructured Ketorolactromethamine/MCF composite(CICAT, 2018) Cussa , Jorgelina; Juárez, Juliana María; Prados, Antonela M.; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoLos sistemas controlados de administración de fármacos mantienen la concentración de medicamentos en los lugares específicos del cuerpo, mejorando la eficacia terapéutica y reduciendo la toxicidad. El material de espuma celular mesoestructurada (MCF) es un nuevo y prometedor huésped para los sistemas de administración de fármacos debido a su alta biocompatibilidad, biodegradabilidad in vivo y baja toxicidad. El composite Ketorolaco-Tromethamine/MCF fue sintetizado. La síntesis de material y la carga de ketorolacotrometamina en los poros de MCF fueron exitosas, demostrándose mediante XRD, FTIR, TGA, TEM y análisis de textura. Obtuvimos resultados prometedores para la liberación controlada de fármacos utilizando el nuevo material MCF. La aplicación de estos materiales en la liberación de KETO es innovadora, logrando una alta velocidad inicial y luego manteniendo una velocidad constante en tiempos altos. Esto permite mantener la concentración del fármaco dentro del rango de eficacia terapéutica, siendo altamente aplicable para el tratamiento de enfermedades que necesitan una respuesta rápida. La liberación de KETO/MCF se comparó con otro soporte de KETO (KETO / SBA-15) y tabletas comerciales.Item Fe-CMK-3 nanostructured material applied in hydrogen uptake J.(Catalysis Society of Australia, 2019) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoAll over the world in the past decades, one of the most concerning subjects has been fossil fuel reduction, along with the global warming issue. These concerns have made hydrogen an ideal alternative to conventional fossil-fuel resources. Nevertheless, it has serious disadvantages, such as low volumetric and gravimetric densities that limit its storage [1]. One kind of OMC involves the carbon mesostructured from Korea (CMK). CMK-3 was chosen as a support material for hydrogen storage due to its large surface area, high chemical stability, uniform pore diameter, accessible porosity and three-dimensional conducting network [2]. Metal particles dispersed in the porosity of active carbons are largely contributing to enhanced storage abilities. In this work we studied the influence of the incorporation of iron nanoparticles inside the channels of CMK-3. This could help and make it possible storing hydrogen in carbon and silica matrix but with another mechanism, with a better reversibility improving hydrogen adsorption/desorption behavior.Item Fermentative biohydrogen production from a novel combination of vermicompost as inoculum and mild heat-pretreated fruit and vegetable waste(Biofuel Research Journal, 2019) Pascualone, María J.; Gómez Costa , Marcos Bruno; Dalmasso, Pablo R.This study reports for the first time on biohydrogen production by dark fermentation using a novel combination of mild heat- pretreated fruit and vegetable waste (FVW) as raw material and vermicompost as an economical source of hydrogen-producing bacteria. A suspension rich in reducing sugars obtained from FVW was used at different initial concentrations (5 to 25 g reducing sugars/L) during the bioprocess conducted in batch reactors at mesophilic temperature of 35 °C. The use of a mild heat-pretreated substrate and the consequent elimination of the natural microbiota present in the FVW led to higher hydrogen production than the control. Clostridium species, hydrogen-producing bacteria via butyric acid fermentation pathway, were the dominant microorganisms in the bioprocess. Hydrogen production, volumetric hydrogen production rate, and pretreated substrate degradation efficiency (63.0 mL/g VS, 372.6 mL/L/d, and 50% BOD5, respectively) obtained in the experiments performed with the highest substrate concentration demonstrated that the developed bioprocess was promising simultaneously leading to high hydrogen contents in biogas and high substrate removal efficiencies.Item Ga-SBA-3 A novel nanostructured material: synthesis, characterization and application(IOP Publishing, 2019) Martínez, María Laura; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoThis paper reports for the first time the incorporation of gallium into the structure of the mesoporous SBA-3 material in order to modify the intrinsic acidity of the material. The study indicates the effective incorporation of Ga into a network in tetrahedral form, with most in the interior of the lodging and a low proportion on the external surface. Gallium was introduced via post-synthesis using Ga-nitrate in appropriate conditions. The nanostructured material was characterized by ICP, x-ray diffraction, nuclear magnetic resonance-MAS, x-ray photoelectron spectra, FTIR, SEM, transmission electron microscopy and UV–vis. Pyridine was used as a probe molecule for the determination of its acidity following the amount and type of acidic sites by FTIR. In addition, aniline adsorption/desorption studies and subsequent in situ polymerization, polyaniline (PANI)/Ga-SBA-3, were carried out with the aim of producing a nanocomposite with conductive properties. The original material had good structural regularity and acidity of Brønsted and Lewis; the PANI/Ga-SBA-3 composite also showed a conductivity of 2.5 × 10−3 S cm−1, higher than that of its homologs Al-SBA-3 and Al-MCM- 41.Item H2 storage using Zr-CMK-3 developed by a new synthesis method.(Univesidsad Tecnológica Nacional, 2021) Juárez , Juliana María; Venosta , Lisandro; Anunziata, Oscar Alfredo; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoOne of the biggest problems in using hydrogen as an alternative fuel is that its storage must be safe and portable. This work addresses a new direct synthesis technique used to obtain a novel mesoporous carbon (CMK-3) modified with zirconium oxide. This novel material shows promise for hydrogen adsorption and storage application for energy harvesting. Zirconium oxide (Zr-CMK-3) material is achieved through successful synthesis and characterized by XRD, SEM,Raman, BET, UV-Vis-DRS, XPS and TEM analyses. Zr-CMK-3 signifi- cantly improved H2 storage performance (reaching at 77 K and 10 bar 4.6 wt%) comparedto the pristine CMK-3. The novel material is favorable for H2 uptake by using weak bonding (physisorption). A hydrogen uptake mechanistic approach is proposed and the role of the Zr+4 cation in hydrogen adsorption is discussed.Item Influence of vanadium nanoclusters in hydrogen uptake using hybrid nanostructured materials(CICAT, 2018) Juárez , Juliana María; Cussa , Jorgelina; Gómez Costa , Marcos Bruno; Anunziata , Oscar AlfredoEn el presente trabajo se presenta la síntesis y caracterización de nanoclusters de oxidos de vanadio (V2O5) soportados en un material nanoestructurado de silicio (SBA-15) y en un material nanoestructurado de carbono (CMK-3). Este material presenta características prometedoras para ser utilizado en la adsorción de hidrógeno. Los distintos materiales modificados con nanoclusters de oxidos de vanadio (VxOy-SBA-15 and VxOy-CMK-3) se lograron sintetizar exitosamente y fueron caracterizados mediante Difracción de Rayos X, Propiedades Texturales, XPS y TEM. VxOy-SBA-15 and VxOy-CMK-3 mejoraron notablemente la adsorción de hidrogeno (1.33 %p/p y 3.43 %p/p a 77 K y 10 bar) comparados con sus soportes SBA-15 y CMK-3 respectivamente. Estos materiales son prometedores para la adsorción de hidrógeno mediante débiles fuerzas de interacción (fisisorción).Item Influence of vanadium nanoclusters in hydrogen uptake using hybrid nanostructured materials(Springer Science+Business Media, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Martínez, María Laura; Anunziata, Oscar AlfredoIn this work, we report the synthesis and characterization of vanadium oxide nanoclusters (V2O5) supported in silica nano- structured material (SBA-15) and nanostructured carbon (CMK-3). This material is promising in hydrogen adsorption and storage application for energy harvesting. The materials with vanadium oxide nanoclusters (VxOy-SBA-15 and VxOy-CMK-3) were successfully synthesized and characterized by X-ray diffraction, textural properties, UV–Vis-DRS, X-ray photoelec- tron spectroscopy, temperature programmed reduction and transmission electron microscopy analyses. VxOy-SBA-15 and VxOy-CMK-3 improved significantly the H2 storage behavior (1.33 wt% and 3.43 wt% at 77 K and 10 bar) compared with their respective supports SBA-15 and CMK-3. The materials synthesized are promising in hydrogen uptake by weak link forces (physisorption). A mechanism of hydrogen adsorption was proposed and V5+ cation roll in hydrogen uptake was discussedItem Influencia de nanoclusters de óxido de vanadio dispersos en materiales nanoestructurados híbridos en el almacenamiento de hidrógeno(RITEQ, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Martínez, María Laura; Anunziata, Oscar AlfredoEn todo el mundo en las últimas décadas, uno de los temas más preocupantes ha sido la reducción de los combustibles fósiles, junto con el problema del calentamiento global. Estas preocupaciones han convertido al hidrógeno en una alternativa ideal a los recursos fósiles convencionales. Un tipo de OMC, el carbón mesoestructurado de Corea (CMK), se sintetiza mediante la estrategia de nanocasting utilizando silicatos mesoporosos como plantillas; tiene un área superficial alta (de 1000 a 2000 m2 / g) y un volumen de poro en el rango de 0.5 a 1 ml.g-1. Por consiguiente, se eligió el CMK-3 como material de soporte para el almacenamiento de hidrógeno debido a su gran área superficial, alta estabilidad química, diámetro de poro uniforme, porosidad accesible y red tridimensional [Yang et al. (2005), Anbia et al. (2009), Anbia et al. (2011)]. Por otro lado, el material mesoporoso silíceo, SBA-15 muestra redes regulares y un diámetro de poro que fluctúa de 1.5 a 10 nm dependiendo del agente plantilla utilizado en su síntesis. Debido a su tamaño y forma de poros, es un material adecuado como absorbente para una variedad de gases y vapores [Schmidt et al. (1995), Soler-Illia (2002)]. En este trabajo estudiamos la influencia de la incorporación de nanopartículas de vanadio dentro de los canales de dos soportes diferentes, el silicato mesoporoso SBA-15 y el carbón mesoporoso CMK-3. Esta investigación incluye la síntesis del silicato mesoporoso y la síntesis de CMK-3 mediante la estrategia de nanocasting, la incorporación de nanoclusters de vanadio por impregnación de humedad, la caracterización de estos nanomateriales por XRD, adsorción de N2, XPS, TPR y UV-Vis, TEM y el estudio de la mejora en la adsorción de hidrógenoItem KETO/LP-SBA-15 composite as a drug release system(Materials Research Society, 2018) Cussa, Jorgelina; Juárez, Juliana María; Prados , Antonela M.; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoControlled drug delivery systems can maintain the concentration of drugs in the exact sites of the body within the optimum range and below the toxicity threshold, improving therapeutic efficacy and reducing toxicity. SBA-15 with larger pore sizes material (LPSBA- 15) is a new promising host for drug delivery systems due to high biocompatibility, in vivo biodegradability and low toxicity. Large-pore mesoporous silica supports has been applied in studies of ketorolac tromethamine (KETO) adsorption and release. KETO/LP-SBA-15 composite was synthesized. The material synthesis and loading of KETO into LP-SBA-15 pores were successful. We obtained promising results for controlled drug release using the novel LP-SBA-15 material. The ability of KETO/LP-SBA-15 release was measured. The concentration of KETO in HCl solution or buffer in a specific time was determined by UV-Vis. First-order, Higuchi and Ritger-Peppas (or Korsmeyer-Peppas) models were used to fit experimental release data. Figure 1 show the fitting results, where Qt/Q∞ is the release fraction per unit mass in time t, k represents release rate in all models and n is a measure of desorption intensity in Ritger-Peppas regression. In this work, we have shown a promising drug storage material for the effective encapsulation and controlled release of KETO, achieving the required therapeutic efficacy. KETO was adsorbed into LP-SBA-15 channel surface without affecting the chemical structure or composition of KETO. The study also demonstrates the storage capacity and release properties of LP-SBA-15 containing KETO. The release of KETO contained in LP-SBA-15 can offer significant improve in controlled drug release and enhance a good analgesia effect.Item Ketorolac-tromethamine contained in SBA-15 host as a drug release system,(Univesidsad Tecnológica Nacional, 2017) Cussa , jorgelina; Prados, Antonella; Juárez , Juliana María; Gómez Costa , Marcos Bruno; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaDrug delivery is an emerging field mainly focused on targeting drugs. The goal of this targeted delivery is to transport an amount of drugs to desirable sites (such as tumors and diseased tissues) while minimizing unwanted side effects of the drugs on other tissues[1]. Controlled drug delivery systems can achieve precise spatial and temporal delivery of therapeutic agents to the target site[2]. The ordered mesoporous silica SBA-15 has been applied in studies of ketorolac tromethamine adsorption and release. The SBA-15 materials with hexagonal and regular structure were obtained using a triblock copolymer Pluronic P123 as a template and TEOS as a silica source[3]. Ketorolac tromethamine was adsorbed into SBA-15 silica nanochannels using ethanol as solvent. The physicochemical and textural properties of SBA-15 and ketorolac tromethamine/SBA-15 were characterized by X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, Fourier transform infrared spectroscopy and BET surface studies. Drug release was evaluated by soaking the loaded silica mesoporous material into a solution of HCl (0.1N) at initial time (0 - 2 h) and buffer pH 7 at high times at 37 ºC under continuous stirring. Oral commercial Keto tablets (Dolten®) and Keto solution (Keto power) were study for the contrast. Release studies were performed in order to evaluate the required therapeutic efficacy. In this work, we have shown a promising drug storage material for the effective encapsulation and controlled release of KETO, achieving the required therapeutic efficacy. SBA-15/KETO shows characteristic bands of both, drug materials and the inorganic framework. This indicates that KETO was adsorbed into SBA-15 channel surface without affecting the chemical structure or composition of KETO. The study also demonstrates the storage capacity and release properties of SBA-15 containing KETO. The release of KETO contained in SBA-15 can offer significant improve in controlled drug release and enhance a good analgesia effect.Item Nanoclusters of iron oxice included in CMK-3mesoporous carbon use as hydrogen storage material(Materials Research Society, 2019) Juárez, Juliana María; Venosta, Lisandro F.; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoIn this work we studied the influence of the incorporation of iron oxide nanoparticles inside the channels of the nanostructured mesoporous carbon CMK-3. This research includes synthesis of the mesoporous silicate and synthesis of CMK-3 by nanocasting strategy, incorporation of the iron oxide nanoclusters by wetness impregnation, characterization of these nanomaterials by XRD, N2 adsorption, XPS, and TEM, and study of the improvement in hydrogen adsorption. This material is promising in hydrogen adsorption and storage application for energy harvesting. According to XRD studies, the incorporation of oxide nanoclusters does not compromise the overall structure of the mesoporous carbon CMK-3. In the wide angle region it has been found typical reflections of iron oxide corresponding to the magnetite phase (Fe2+Fe3+ 2 O4). The modified sample Fe-CMK-3 reveal a reduced specific surface area and smaller pore diameter compared to pristine CMK-3 which involves the formation of magnetite nanoparticles within the mesoporous channels of CMK-3. TEM images of Fe-CMK-3 presents metallic oxide nanoparticles well dispersed. The incorporation of iron oxide nanoparticles improved significantly the H2 storage behavior (4.45% wt at 77K and 10 bar) compared to its respective support (CMK-3). Magnetite nanoclusters increased the capacity of hydrogen adsorption in pristine materials. Supposing that weakly orbital interactions occur between H2 and the metal nanocluster, physisorption is the main interaction, all cases have the potential to uptake H2 weakly as physisorption process and the last interaction achieves sufficiently strong energies to store more hydrogen to reach the level adsorption in Fe-CMK-3. In addition, no hydrogen chemisorption was detected. The materials synthesized are promising in hydrogen uptake by weak link forces (physisorption).Item Nanocomposite aplicados a la liberación controlada de fármacos.(Universidad Tecnológica Nacional Regional Córdoba., 2020) Cussa, Jorgelina; Prados, Antonella; Gómez Costa , Marcos Bruno; Juárez , Juliana María; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaLas nanomedicinas terapéuticas pueden transportar Principio Activo (PA) hasta los tejidos patológicos, consiguiendo que las células enfermas reciban una gran descarga de PA y disminuyendo el acceso del PA sobre las células sanas. El objetivo principal de este estudio es determinar la capacidad adsorción y las propiedades de almacenamiento de la LP-SBA 15/KETO y la liberación logrando la eficacia terapéutica requeridaItem Novel hybrid Ga-SBA-3 nanostructured material: Synthesis, Characterization and Applications(., 2018) Martínez, María Laura; Gómez Costa , Marcos Bruno; Beltramone, Andrea Raquel; Anunziata, Oscar AlfredoIn this work we study the incorporation of gallium in the structure of the SBA-3 mesoporous material, with the purpose of modifying the intrinsic acidity of the material using pyridine in order to determine the acidic sites that this material possesses. In addition, studies of adsorption / desorption of aniline and its subsequent polymerization on the mesoporous Ga-SBA-3, that gives the unique hybrids compound, with conductive characteristics similar to those of an inorganic semiconductor. Si-SBA-3 was prepared using CTABr and TEOS, as surfactant and Si source respectively. To obtain Ga-SBA-3 post-synthesis incorporation was employed. Ga-SBA-3 were dehydrated at 400 ° C under vacuum and then were exposed to vapors of pyridine / liquid aniline depending on the studies to be performed (pyridine to determine the acid sites of the material and aniline for subsequent polymerization) at vacumm. The in-situ polymerization of aniline was carried out to produce PANI/Ga-SBA-3. The final PANI/Ga-SBA-3 material was characterized by XRD, ICP, SEM-EDX, FTIR, BET. Direct current electrical conductivity measurements were performed using pellets and a four-probe technique, improving the contacts with a gold layer. Higher amount of polyaniline in conductive emeraldine salt form was found in PANI/Ga-SBA-3 composite, with respect to other composites reported in the literature. At room temperature (273 K), the electrical conductivity of PANI/Ga-SBA-3 was 2.5x10-3 S/cm, higher than its of Al-SBA-3 and Al-MCM- 41 homologs. To explain the conductivity of the composite (nanowire of PANI within Ga-SBA-3), we must consider the configuration of the nanostructured material and the type of PANI anchoring.Item Ordered mesoporous carbons (OMC) type CMK-3 modified with Vandium for improvement H2 storage(Diamond and Carbon Conference Organization, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Martínez, María Laura; Anunziata, Oscar Alfredo; Martínez, María LauraSome previous studies probed that H2 adsorption can be improved for mesoporous carbons introducing into the framework of the nanomaterial some metals or oxides, like platinum, Zn, ZnO, Ni, NiO, or TiO2. Some other authors have made several efforts in the same direction, for instance, incorporated iron and copper nanoparticles into multiwalled carbon nanotubes and studied their hydrogen adsorption. In this work we studied the influence of the incorporation of vanadium nanoparticles inside the channels of mesoporous carbon CMK-3. This research includes the synthesis of the mesoporous silicate, (hard Template) and the synthesis of the CMK-3 by nanocasting strategy and the incorporation of the vanadium nanoclusters by wetness impregnation. This kind of materials are synthesize by nanocasting strategy using mesoporous silicates as templates and have high surface area (from 1000 to 2000 m2/g) and pore volumes in the range of 0.5 to 1 ml.g-1. Accordingly, CMK-3 was chosen as a support material for hydrogen storage due to its large surface area, high chemical stability, uniform pore diameter, accessible porosity and threedimensional conducting network. The characterization of these nanomaterials was obtained by XRD, N2 adsorption, XPS, TPR and Uv-Vis, TEM, and finally the study of the improvement in the hydrogen adsorption. V5+ cation in V2O5 is an active species to uptake and store hydrogen by a physisorption process and the support plays an important role in metal cluster dispersion and size.Item Ordered mesoporous SBA-15 host for Ketorolac-Tromethamine loading and release behavior.(Univesidsad Tecnológica Nacional, 2017) Cussa , jorgelina; Juárez , Juliana María; Gómez Costa , Marcos Bruno; Anunziata , Oscar Alfredo; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaThe ordered mesoporous silica SBA-15 has been applied in studies of ketorolac tromethamine adsorption and release. The SBA-15 materials with hexagonal and regular structure were obtained using a triblock copolymer Pluronic P123 as a template and TEOS as a silica source. Ketorolac tromethamine was adsorbed into SBA-15 silica nanochannels using ethanol as solvent. The physicochemical and textural properties of SBA-15 and ketorolac tromethamine/SBA-15 were characterized by X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, Fourier transform infrared spectroscopy and BET surface studies. The composite SBA-15/KETO shows characteristic bands of both, drug materials and the inorganic framework. This indicates that KETO was adsorbed into SBA-15 channel surface without affecting the chemical structure or composition of KETO. Drug release was evaluated by soaking the loaded silica mesoporous material into a solution of HCl (0.1N) at initial time (0 - 2 h) and buffer pH 7 at high times at 37 ºC under continuous stirring. Oral commercial Keto tablets (Dolten®) and Keto solution (Keto power) were study for the contrast. Release studies were performed in order to evaluate the required therapeutic efficacy. SBA-15 provides significant improvement in the controlled release of ketorolac tromethamine and enhance a good analgesia effect.Item Óxidos de vanadio y titanio soportados sobre CMK-3 como un nuevo catalizador para la desulfuración oxidativa de DBT.(Universidad Tecnológica Nacional., 2016) Beltramone , Andrea Raquel; Anunziata , Oscar Alfredo; Gómez Costa , Marcos Bruno; Falcón , Horacio; Juárez , Juliana Maria; Rivoira , Lorena Paola; Rivoira , Lorena Paola; Juárez , Juliana Maria; Anunziata , Oscar AlfredoEn el presente trabajo se estudiaron catalizadores de vanadio soportados sobre el carbón mesoporosos CMK 3 con diferentes contenidos de Vanadio (1-7 % p/p) en la desulfurización oxidativa de dibenzotiofeno (DBT) como modelo de compuestos sulfurados. La actividad catalítica se comparó con catalizadores de Titanio soportados en CMK-3. Las propiedades estructurales y texturales de los catalizadores se analizaron mediante estudios de adsorción de N2, XRD, UV-Vis-DRS y TEM. Tanto la dispersión como la actividad catalítica dependen fuertemente del contenido de vanadio. La muestra que contiene el 7% p/p de Vanadio es el catalizador con mejor actividad catalítica para la reacción de ODS de DBT utilizando peróxido de hidrógeno ((H2O2) como oxidante y acetonitrilo como solvente. El 100% de la eliminación de DBT se alcanzó a corto plazo en condiciones suaves. El carbon mesoporoso CMK-3 con una alta área superficial y gran volumen de poros promueve el anclaje del metal en la red de carbono, lo que permite alcanzar una alta distribución de sitios activos y nanoclusters más estables. La reutilización del catalizador indica que V-CMK-3 es un catalizador potencial para los ODS de dibenzotiofeno.Item Reservorio nanoscópico de hidrógeno a partie de biorresiduos de cáscara de naranjas.(Universidad Tecnológica Nacional., 2022) Juárez , Juliana María; Ledesma , Brenda Cecilia; Anunziata , Oscar Alfredo; Gómez Costa , Marcos Bruno; Beltramone , Andrea Raquel; Anunziata , Oscar Alfredo; Ledesma , Brenda CeciliaEste trabajo aborda el enfoque de valorización de biorresiduos para el desarrollo de un novedoso nanomaterial carbonoso para ser utilizado en la adsorción de hidrógeno como una alternativa en el uso de hidrógeno verde. En esta investigación, los carbones activados se sintetizaron a partir de cáscara de naranja utilizando diferentes condiciones de síntesis. Con los carbones activados obtenidos con la mejor estructura y textura se estudió la adsorción de hidrógeno y los efectos en la meso/microporosidad de estos. La activación del carbón se realizó mediante un proceso químico con ácido fosfórico como agente activador, variando la concentración de ácido, la relación sustrato / agente activador y el tiempo de contacto entre ellos. El mejor material se obtuvo utilizando tiempo de carbonización de 1 h, temperatura de carbonización de 470oC, concentración de ácido fosfórico de 50% en peso y con área BET de 1402 m2 / g. Dicho material mejoró significativamente el comportamiento de almacenamiento de H2 en comparación con el carbón nanoestructurado del tipo CMK-3 (3,1% en peso a -196,15 oC y 10 bar). El material sintetizado es prometedor en la absorción de hidrógeno por fuerzas de enlace débiles (fisisorción).Item Síntesis directa del carbón mesoporoso ordenado CMK-3 modificado con circonio en almacenamiento de energía.(Univesidsad Tecnológica Nacional., 2020) Venosta, Lisandro; Juárez , Juliana María; Anunziata , Oscar Alfredo; Gómez Costa , Marcos Bruno; Anunziata , Oscar Alfredo; Juárez , Juliana MaríaEn este trabajo, informamos la síntesis y caracterización del material de carbono nanoestructurado (CMK-3) modificado con óxido de circonio sintetizado por una nueva técnica de síntesis directa. Este material es prometedor en la aplicación de adsorción de hidrógeno para el almacenamiento de energía. Los materiales con óxido de circonio (Zr-CMK-3) se sintetizaron con éxito y se caracterizaron por difracción de rayos X, propiedades texturales, UV-Vis-DRS, XPS y análisis de microscopía electrónica de transmisión. El material Zr-CMK-3 mejoró significativamente el comportamiento de almacenamiento de H2 (4,6% en peso a 77 K y 10 bar) en comparación con el soporte CMK-3. El material sintetizado es prometedor en la absorción de hidrógeno por fuerzas de enlace débiles (fisisorción). Se propuso un mecanismo de adsorción de hidrógeno y se discutió el rol de catión Zr+4 en la absorción de hidrógeno. Palabras clave: Circonio, CMK-3, Hidrógeno, Almacenamiento, EnergíaItem Síntesis y caracterización del material nanoestructurado Fe-CMK-3 utilizado en almacenamiento de hidrógeno(Sociedad Argentina de Catálisis, 2019) Venosta, Lisandro F.; Juárez, Juliana María; Gómez Costa , Marcos Bruno; Anunziata, Oscar AlfredoEn este trabajo, informamos la síntesis y caracterización de nanoclusters de óxido de hierro soportados en el carbón nanoestructurado (CMK-3). Este material es prometedor en la aplicación de almacenamiento y adsorción de hidrógeno para almacenamiento de energía. Los materiales con nanoclusters de óxido de hierro (Fe-CMK-3) se sintetizaron exitosamente y se caracterizaron mediante difracción de rayos X, propiedades texturales y análisis de microscopía electrónica de transmisión. La incorporación de oxidos de hierro mejoró significativamente el comportamiento de almacenamiento de H2 (4,45% en peso a 77K y 10 bar) en comparación con su respectivo soporte (CMK-3). El material sintetizado es prometedor en la adsorción de hidrógeno por fuerzas de enlace débil (fisisorción). Se propuso un mecanismo de adsorción de hidrógeno y los nanoclusters de óxido de Fe en fase de magnetita tienen un rol importante en la absorción de hidrógeno.