Facultad Regional Buenos Aires

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Author: search.filters.author.Binetti Basterrechea, Gian Franco

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    Iron nanoparticles based nanofluids for in situ environmental remediation
    (2023) Crespi, Julieta; Binetti Basterrechea, Gian Franco; Finoli, Agostina Sol; Montesinos, Victor Nahuel; Quici, Natalia
    The injection of nanoscale zerovalent iron particles (nZVI) suspensions in the ground is a technology employed for in situ water and soil remediation. Due to its nature, nZVI forming these nanofluids (NFs), tend to agglomerate, but this can be overcome by polyelectrolyte coatings, that also improve their mobility. In this work, stabilization of nZVI with carboxymethylcellulose (CMC) was studied. NFs prepared with CMC (CMC-NSTAR) were compared with non-stabilized NFs (b-NSTAR). First, the stabilization efficiency was evaluated by the analysis of the nanoparticles sedimentation rate. Then, the mobility of stabilized and non-stabilized NFs was studied in columns filled with porous media at laboratory and pilot scale. Finally, NFs reactivity for the removal of aqueous Cr(VI) was tested in batch and columns experiments. In the column experiments, a porous media bed was loaded with NSTAR and then a Cr(VI) solution was injected upwards. CMC-NSTAR showed good mobility at both scales being successfully eluted from the porous media. In the case of b-NSTAR, the accumulation of nanoparticles in the bottom of the column was observed and elution was not achieved. Using b-NSTAR as reactive barrier, a total removal of 15.5 mg Cr(VI)/g Fe was achieved. Better removal rates were found in batch experiments (22.8 mg Cr(VI)/g Fe). Reactivity experiments in batch with CMC-NSTAR showed 39.9 mg Cr(VI)/g Fe removal. In conclusion, the NF was proved to have good transport properties and Cr(VI) removal capacity.
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    Caracterización reológica de nanofluidos basados en hierro para remoción in situ de contaminantes inorgánicos
    (Luis Fernandez Luco (compilador), 2022) Crespi, Julieta; Binetti Basterrechea, Gian Franco; Quici, Natalia
    Las nanopartículas de hierro cerovalente son materiales eficaces para remoción de contaminantes presentes en agua. La estabilización de suspensiones acuosas de nanopartículas empleando polielectrolitos evita su aglomeración y precipitación y permite formar nanofluidos con buenas propiedades de transporte en lecho poroso. Estos nanofluidos son útiles para el tratamiento in situ de aguas subsuperficiales por inyección en suelo. El diseño de un sistema de inyección a escala real requiere conocer las características de transporte de los nanofluidos siendo para ello fundamental las medidas de viscosidad, así como también el empleo de herramientas de modelado matemático y curvas de ruptura de los nanofluidos en columnas rellenas de medio poroso. En este trabajo se estudiaron nanofluidos estables de nanopartículas de hierro cerovalente y carboximetilcelulosa, empleados con éxito a escala laboratorio y piloto en ensayos de transporte. Los nanofluidos se caracterizaron reológicamente empleando un reómetro híbrido y se realizaron ensayos de flujo y oscilatorios para determinar el comportamiento de la viscosidad y de los módulos elástico y viscoso. Se compararon dos suspensiones con distintas cantidades de nanopartículas y carboximetilcelulosa y, adicionalmente, se estudiaron soluciones de carboximetilcelulosa de igual concentración. Luego, se ajustaron los resultados de los ensayos de flujo empleando diversos modelos reológicos para describir el comportamiento de los nanofluidos y las soluciones de carboximetilcelulosa. Se observó que la viscosidad de los nanofluidos disminuye respecto de las soluciones de carboximetilcelulosa de igual concentración. Se obtuvieron en general buenos ajustes empleando los modelos de Ley de la Potencia, Herschel-Bulkley y Cross.
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    Iron nanoparticles based nanofluids for in situ environmental remediation
    (Oscar Pagola (Asociación Argentina de Ingenieros Químicos), 2024) Crespi, Julieta; Binetti Basterrechea, Gian Franco; Finoli, Agostina Sol; Montesinos, Victor Nahuel; Quici, Natalia
    In this work, stabilization of commercial nZVI (NANOFER STAR, hereafter NSTAR, provided by NANOIRON s.r.o.) with carboxymethyl cellulose (CMC) was studied. NFs prepared with CMC (CMC-NSTAR) were compared and with NFs prepared without CMC (b-NSTAR). Stabilization was evaluated by sedimentation rate analysis of the nanoparticles in CMC-NSTAR versus b-NSTAR. The mobility of both stabilized and non-stabilized NFs was studied in columns filled with porous media at laboratory and pilot scale. NFs were injected upwards in the column with a peristaltic pump, and the nZVI concentration was monitored with turbidity measurement at the outlet stream. Then, NFs reactivity for the removal of aqueous Cr(VI) was tested in batch and columns experiments. In the batch experiments, 15 mg L-1 Cr(VI) solutions and the NFs were mixed with an orbital shaker, with a Fe:Cr molar ratio = 10. In the column experiments, a porous media bed was loaded with 0.5 g of n-NSTAR and then a 100 mg L-1 Cr(VI) solution was injected upwards.
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    Photocatalytic NOx removal with TiO2-impregnated 3D-printed PET supports
    (2023) Binetti Basterrechea, Gian Franco; Montesinos, Victor Nahuel; Quici, Natalia
    In this work, the photocatalytic removal of NOx with 3D-printed supports was studied. The technology consisted of a continuous gas flow phase reactor containing a 3D printed PET support impregnated with TiO2 as photocatalyst. The 3D impregnated supports were characterized by diffuse reflectance spectrometry and SEM/EDS. The effect of several key-factors on the removal capacity were studied: type of PET filament (native, BPET vs glycol-modified, PETG), type of TiO2 (P-25 vs Hombikat UV-100), UV-light source (LED vs tubular lamps) and number of deposited TiO2 layers. The highest NO and NOx removal were achieved by only one layer of Hombikat UV-100 over PETG supports, irradiating from both sides of the flat reactor with two sets of black light lamps. This work demonstrate that 3D printing is a reliable and powerful technique for fabrication of photocatalytic reactive supports.
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    Photocatalytic NOx removal with TiO2-impregnated 3D-printed PET supports
    (2023-11-20) Binetti Basterrechea, Gian Franco; Montesinos, Victor Nahuel; Quici, Natalia
    In this work, we investigated the photocatalytic removal of NOx using 3D-printed supports. Monolithic supports with internal channels were fabricated by Fused Modelling Deposition (FDM) using PET as the filament feedstock. The printing parameters of the supports were optimized to maximize the exposure of the photocatalyst to UV light throughout the monolithic PET printed supports. The removal experiments were carried out in a continuous gas phase flow reactor, which was custom designed in-house incorporating a 3D printed PET support impregnated with TiO2 as photocatalyst. The impregnated and non-impregnated supports were characterized by diffuse reflectance spectrometry, SEM and AFM. The effect of several key-factors on the NOX removal capacity was investigated, including the type of PET filament (native recycled, BPET vs. glycol-modified, PETG), the type of TiO2 (P25 vs Hombikat UV-100), the UV light source (LED vs. tubular lamps), and the number of deposited TiO2 layers. The highest NO and NOx removal were achieved by using PETG supports coated with a single layer of Hombikat UV-100 and irradiating the flat reactor from both sides using two sets of black light lamps. However, the highest selectivity toward nitrate formation was obtained when using P25 under the same experimental conditions. This work demonstrates that 3D printing is a reliable and powerful technique for fabricating photocatalytic reactive supports that can serve as a versatile platform for evaluating photocatalytic performance.