Persona:
María Hormigos, Roberto

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ORCID
0000-0001-8002-3998
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María Hormigos
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Roberto
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20183
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Fecha de finalización: 2018 × Fecha de inicio: 2018 ×

Resultados de la búsqueda

Mostrando 1 - 3 de 3
  • Miniatura
    Publicación
    Carbon nanotubes-ferrite-manganese dioxide micromotors for advanced oxidation processes in water treatment
    (Royal Society of Chemistry, 2018) Pacheco Jerez, Marta; Jurado Sánchez, Beatriz; Escarpa, Alberto; María Hormigos, Roberto::virtual::2834::600; María Hormigos, Roberto; María Hormigos, Roberto; María Hormigos, Roberto
    Multifunctional SW-Fe2O3/MnO2 tubular micromotors are used for ‘on-the-fly’ advanced water oxidation of industrial organic pollutants. Catalytic decomposition of H2O2 as an oxidation agent results in the production of oxygen bubbles and hydroxyl radicals for complete mineralization of model pollutants into CO2 and H2O. The carbon backbone with Fe2O3 nanoparticles results in a rough catalytic layer for increased speed (16-fold acceleration as compared with smooth counterparts) and a higher radical production rate. The micromotors can propel autonomously in complex wastewater samples (400 μm s−1, 2% H2O2) using a biocompatible surfactant and obviating the need for expensive Pt catalysts. Such self-propelled micromotors act as highly efficient dynamic oxidation platforms that offer significantly shorter and more efficient water treatment processes, reducing the use of chemical reagents. The effective operation of the SW-Fe2O3/MnO2 micromotors is illustrated towards the oxidative degradation of mg L−1 levels of Remazol Brilliant blue and 4-chlorophenol. Factors influencing the micromachine-enhanced oxidation protocol, such as the pH, navigation time and number of motors, have been investigated. High degradation rates of ∼80% are obtained for both pollutants following 60 min treatment of spiked wastewater samples at pH 4.0–5.0. The unique magnetic properties of the outer Fe2O3 layer allow the reusability of the micromotors and its convenient recovery and disposal after treatment. Such attractive performance holds considerable promise for its application in large scale water treatment systems and for a myriad of environmental, industrial and security defense fields
  • Miniatura
    Publicación
    Surfactant-Free β-Galactosidase Micromotors for “On-The-Move” Lactose Hydrolysis
    (Wiley Online Library, 2018) Jurado Sánchez, Beatriz; Escarpa, Alberto; María Hormigos, Roberto
    Surfactant-free β-galactosidase micromotors are explored here as moving biocatalyst for highly efficient lactose hydrolysis from raw milk. The coupling of the hydrolytic properties of such enzyme with the efficient movement of carbon nanotube tubular micromotors results in nearly 100% lactose hydrolysis and two fold removal efficiency as compared with static conditions and with free enzyme. The incorporation of an inner Ni layer allows its reusability to operate in batch mode. The rough micromotor surface area allows the immobilization of a high loading of β-galactosidase and results in an increase in the enzyme affinity toward lactose. The new micromotor concept opens new avenues for the use of micromotors as moving immobilized biocatalyst to improve the technological process not only in food industry but also in other fields.
  • Miniatura
    Publicación
    Self-Propelled Micromotors for Naked-Eye Detection of Phenylenediamines Isomers
    (ACS Publications, 2018) Jurado Sánchez, Beatriz; Escarpa, Alberto; María Hormigos, Roberto
    Tubular micromotors composed of a hybrid single-wall carbon nanotube (SW)−Fe2O3 outer layer and powered by a MnO2 catalyst are used for phenylenediamines isomers detection and discrimination. Catalytic decomposition of H2O2 as fuel results in the production of oxygen bubbles and hydroxyl radicals for phenylenediamines dimerization to produce colorful solutions in colorimetric assays. The combination of Fe2O3 nanoparticles along with the irregular SW backbone results in a rough catalytic layer for enhanced hydroxyl radical production rate and improved analytical sensitivity. Such self-propelled micromotors act as peroxidase-like mobile platforms that offer efficient phenylenediamines detection and discrimination in just 15 min. Factors influencing the colorimetric assay protocol, such as the navigation time and number of motors, have been investigated. Low limits of detection (5 and 6 μM) and quantification (17 and 20 μM) were obtained for o-phenylenediamine and p- phenylenediamine, respectively. The magnetic properties of the outer SW−Fe2O3 hybrid layer allow the reusability of the micromotors in the colorimetric assay. Such attractive performance holds considerable promise for its application in sensing systems in a myriad of environmental, industrial, and health applications.