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Rojas Cervantes, María Luisa

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0000-0001-5528-9276
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Rojas Cervantes
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María Luisa
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2004 - 200942010 - 201952020 - 20245
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Mostrando 1 - 10 de 14
  • Miniatura
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    Colaboraciones en Química: La revolución de los materiales del siglo XXI
    (Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2016-01-01) Delgado Gómez, Francisco José; Cerpa Naranjo, Arisbel; Calvino Casilda, Vanesa; Rojas Cervantes, María Luisa
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    Presentación de los futuros Grados de la Facultad de Ciencias : Grado en Química
    (Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2008-01-01) Rojas Cervantes, María Luisa
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    Noticias del Decanato : Actividades del Año Internacional de la Química en nuestra Facultad
    (Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2011-01-01) Rojas Cervantes, María Luisa
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    Fe-Cu Doped Multiwalled Carbon Nanotubes for Fenton-like Degradation of Paracetamol Under Mild Conditions
    (MDPI, 2020-04-14) Barrios Bermúdez, Niurka; González Avendaño, Marta; Cerpa Naranjo, Arisbel; Rojas Cervantes, María Luisa
    A series of carbon nanotubes doped with Fe and/or Cu, Fe100−xCux/CNT (x = 0, 25, 50, 75 and 100) has been prepared by an easy method of wetness impregnation of commercial multiwalled carbon nanotubes previously oxidized with nitric acid. The wide characterization of the solids by different techniques demonstrates that the incorporation of Fe and Cu to the CNTs has been successfully produced. Fe100−xCux/CNT samples were tested as catalysts in the removal of paracetamol from aqueous solution by a combined process of adsorption and Fenton-like oxidation. Under mild conditions, 25 ◦C and natural pH of solution, i.e., nearly neutral, values of oxidation of paracetamol between 90.2% and 98.3% were achieved after 5 h of reaction in most of cases. Furthermore, with the samples containing higher amounts of copper, i.e., Cu100/CNT and Fe25Cu75/CNT, only 2 h were necessary to produce depletion values of 73.2% and 87.8%, respectively. The influence of pH and dosage of H2O2 on the performance has also been studied. A synergic effect between both Cu+/Cu2+ and Fe2+/Fe3+ in Fenton-like reaction was observed. These results demonstrate that Fe100−xCux/CNT are powerful Fenton-like catalyst for degradation of paracetamol from aqueous solution and they could be extended to the removal of other organic pollutants.
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    Amino-Functionalized Multiwall Carbon Nanotubes as Efficient Basic Catalysts for the Formation of γ-Lactams: Synthesis of N-1-Heptenyl-2-pyrrolidinone
    (MDPI, 2022) Barrios Bermúdez, Niurka; Cerpa Naranjo, Arisbel; Rojas Cervantes, María Luisa
    In this work, we prepared a series of N-functionalized carbon nanotubes by means of a process of acylation-amidation of commercial multiwall carbon nanotubes that were previously pre-oxidized with nitric acid. Three different amines, butylamine, N,N-dimethyl ethylenediamine, and ethylenediamine, were used in the process. The characterization of samples by several techniques probed the incorporation of nitrogen atoms to the carbon nanotubes, especially in the case of ethylenediamine. The solids were tested as catalysts in the synthesis of N-1-heptenyl-2-pyrrolidinone, included in the group of a γ-lactams, compounds that show important biological properties. The most active catalyst was that prepared with butylamine, which exhibited the highest SBET and Vpore values and contained an amount of nitrogen that was intermediate between that of the other two catalysts. A yield of 60% to N-1-heptenyl-2-pyrrolidinone was achieved after 3 h at 120 ◦C under free-solvent conditions. This catalyst could be used in four consecutive cycles without significant activity loss.
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    Colaboraciones: Compuestos de intercalación. Ejemplos y aplicaciones
    (Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2004-01-01) Rojas Cervantes, María Luisa
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    Congresos, seminarios y cursos de verano
    (Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2008-01-01) Carreras Béjar, Carmen; Fernández y Fernández Arroyo, Fidel José; Martín Aranda, Rosa María; Rojas Cervantes, María Luisa
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    Comparison of the quality attributes of carrot juice pasteurized by ohmic heating and conventional heat treatment
    (Elsevier, 2021-06) Negri Rodríguez, Livia N.; Arias, Ricardo; Soteras, Trinidad; Sancho, Ana; Pesquero, Natalia; Rossetti, Luciana; Tacca, Hernán; Aimaretti, Nora; Rojas Cervantes, María Luisa; Szerman, Natalia
    This study aimed to evaluate the effect of pasteurization of carrot juice by heat treatment (80 ◦C–7 min) and ohmic heating (OH) on its physicochemical and chromatic parameters, enzymatic and microbiological inactivation, volatile compounds, antioxidant capacity, carotene content, and sensory characteristics, compared to control juice (CJ). Both treatments allowed obtaining microbiologically stable and safe carrot juice and achieved 99% peroxidase inactivation levels. Significant differences were obtained in L* parameter, polyphenoloxidase activity and total antioxidant capacity, compared to HT-treated and CJ. The OH-treated juice presented greater color preference (p < 0.05) by semi-trained panelists and a high level of acceptance among consumers (corresponding to “like extremely”). The results allow concluding that OH could be an alternative to conventional HT for the pasteurization of carrot juice, providing benefits in its sensory perception.
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    Actuación del grupo de Teatro de la Facultad de ciencias TEATRAccia
    (Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2010-01-01) Rojas Cervantes, María Luisa