RESUMEN La cooperación entre docentes universitarios, de secundaria y alumnos de primeros cursos ... more RESUMEN La cooperación entre docentes universitarios, de secundaria y alumnos de primeros cursos favorece la mejora de las enseñanzas universitarias enfocadas a la formación de los estudiantes del Master de Educación. El proceso enseñanza-aprendizaje que se llevará a cabo durante la educación secundaria se gesta en la formación adquirida por lo futuros docentes durante su formación en el Master de Educación. La cooperación entres los tres estamentos es necesaria para el diseño de materiales y herramientas docentes. Esta cooperación ayudará a la preparación de recursos didácticos adaptados al nivel de la clase que sirvan para estimular la curiosidad y el interés de los alumnos por las asignaturas de Química.
Advances in Water Treatment and Pollution Prevention, 2012
Sonochemical oxidation is one of the advanced oxidation techniques that are widely used to decomp... more Sonochemical oxidation is one of the advanced oxidation techniques that are widely used to decompose various organic contaminants in aqueous environment. Recent studies have suggested that the use of hybrid techniques is more effective compared to individual techniques for the decomposition of organic contaminants. The combination of more than one oxidation technique overcomes the disadvantages of individual techniques. This chapter provides a very detailed analysis of the sonochemical, sonophotocatalytic, and sonoelectrochemical degradation of various organic pollutants in aqueous environment. In addition to providing experimental data including kinetic information on the degradation reactions, specific examples have been analyzed in terms of their reaction mechanisms.
ABSTRACT Pt-Pd bimetallic nanoparticles supported on graphene oxide (GO) nanosheets were prepared... more ABSTRACT Pt-Pd bimetallic nanoparticles supported on graphene oxide (GO) nanosheets were prepared by a sonochemical reduction method in the presence of polyethylene glycol as a stabilizing agent. The synthetic method allowed for a fine tuning of the particle composition without significant changes in their size and degree of aggregation. Detailed characterization of GO-supported Pt-Pd catalysts was carried out by transmission electron microscopy (TEM), AFM, XPS, and electrochemical techniques. Uniform deposition of Pt-Pd nanoparticles with an average diameter of 3 nm was achieved on graphene nanosheets using a novel dual-frequency sonication approach. GO-supported bimetallic catalyst showed significant electrocatalytic activity for methanol oxidation. The influence of different molar compositions of Pt and Pd (1:1, 2:1, and 3:1) on the methanol oxidation efficiency was also evaluated. Among the different Pt/Pd ratios, the 1:1 ratio material showed the lowest onset potential and generated the highest peak current density. The effect of catalyst loading on carbon paper (working electrode) was also studied. Increasing the catalyst loading beyond a certain amount lowered the catalytic activity due to the aggregation of metal particle-loaded GO nanosheets.
RESUMEN La cooperación entre docentes universitarios, de secundaria y alumnos de primeros cursos ... more RESUMEN La cooperación entre docentes universitarios, de secundaria y alumnos de primeros cursos favorece la mejora de las enseñanzas universitarias enfocadas a la formación de los estudiantes del Master de Educación. El proceso enseñanza-aprendizaje que se llevará a cabo durante la educación secundaria se gesta en la formación adquirida por lo futuros docentes durante su formación en el Master de Educación. La cooperación entres los tres estamentos es necesaria para el diseño de materiales y herramientas docentes. Esta cooperación ayudará a la preparación de recursos didácticos adaptados al nivel de la clase que sirvan para estimular la curiosidad y el interés de los alumnos por las asignaturas de Química.
Advances in Water Treatment and Pollution Prevention, 2012
Sonochemical oxidation is one of the advanced oxidation techniques that are widely used to decomp... more Sonochemical oxidation is one of the advanced oxidation techniques that are widely used to decompose various organic contaminants in aqueous environment. Recent studies have suggested that the use of hybrid techniques is more effective compared to individual techniques for the decomposition of organic contaminants. The combination of more than one oxidation technique overcomes the disadvantages of individual techniques. This chapter provides a very detailed analysis of the sonochemical, sonophotocatalytic, and sonoelectrochemical degradation of various organic pollutants in aqueous environment. In addition to providing experimental data including kinetic information on the degradation reactions, specific examples have been analyzed in terms of their reaction mechanisms.
ABSTRACT Pt-Pd bimetallic nanoparticles supported on graphene oxide (GO) nanosheets were prepared... more ABSTRACT Pt-Pd bimetallic nanoparticles supported on graphene oxide (GO) nanosheets were prepared by a sonochemical reduction method in the presence of polyethylene glycol as a stabilizing agent. The synthetic method allowed for a fine tuning of the particle composition without significant changes in their size and degree of aggregation. Detailed characterization of GO-supported Pt-Pd catalysts was carried out by transmission electron microscopy (TEM), AFM, XPS, and electrochemical techniques. Uniform deposition of Pt-Pd nanoparticles with an average diameter of 3 nm was achieved on graphene nanosheets using a novel dual-frequency sonication approach. GO-supported bimetallic catalyst showed significant electrocatalytic activity for methanol oxidation. The influence of different molar compositions of Pt and Pd (1:1, 2:1, and 3:1) on the methanol oxidation efficiency was also evaluated. Among the different Pt/Pd ratios, the 1:1 ratio material showed the lowest onset potential and generated the highest peak current density. The effect of catalyst loading on carbon paper (working electrode) was also studied. Increasing the catalyst loading beyond a certain amount lowered the catalytic activity due to the aggregation of metal particle-loaded GO nanosheets.
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