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Nanocristales para degradación de un colorante contaminante
Nanocrystals for degradation of a pollutant dye
Palabras clave:
nanopartículas semiconductoras, fotocatálisis, degradación de contaminantes, azul de metileno, aguas residuales (es)semiconductor nanoparticles, degradation of pollutants, methylene blue, photocatalysis, wastewater (en)
La fotoestabilidad de nanocristales (NCs) del grupo II-VI, como CdSe se aprovecha en procesos de fotocatálisis. Sin embargo, el contenido de metales tóxicos limita su aplicación en el ambiente en la remediación de residuos de las industrias textiles, de pieles y de papel. Se comparó la acción catalítica de CdS y ZnS, estabilizadas con dodecil sulfato de sodio y ácido etilendiaminotetraacetico, respectivamente, para el tratamiento fotocatalítico del colorante azul de metileno (AM) con radiación UV. Las dos clases de NCs presentaron bandas de absorción desplazadas hacia 500 nm y bandas de emisión fluorescente a 430-440 nm. Estas características ópticas se atribuyen al tamaño (20-50 y 100-150 nm), confirmado por microscopía electrónica. La degradación del AM por NCs alcanzó rendimientos del 92% y 77% para ZnS y CdS respectivamente, mediante la producción fotocatalítica de radicales hidroxilos capaces de participar en procesos redox. En conclusión, NCs se aprecian como catalizadores eficientes para la remediación de AM, un colorante aromático heterocíclico de amplio uso industrial.
The photo1stability of nanocrystals (NCs) in II-VI group such as CdSe is used for photocatalytic processes. The presence of toxic metals limits their implementation in environmental applications such as synthetic dyes treatment, which are found in textile, leather, and paper industries. NCs ZnS and CdS, stabilized in the presence of ethylendiaminetetraacetic acid and sodium dodecyl sulfate, respectively, were compared in the photocatalytic treatment of methylene blue (MB) under UV light. The two kinds of NCs showed absorption bands displaced towards A77 nm and fluorescent emission bands around 430 nm. These optical properties are attributed to nano size as observed by scanning electron microscopy (20-50 and 100-150 nm). MB degradation by NCs reached yields up to 92% and 77% for ZnS and CdS2 respectively, due to the photocatalytic production of hydroxyl radicals capable of participating in redox processes. In conclusion, NCs catalyzed the remediation of MB, a heterocyclic aromatic dye of broad industrial use.
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