ELIMINACIÓN DE CIANURO MEDIANTE SISTEMA COMBINADO UV/H2O2/TiO2
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Rev. Bol. Quim
Abstract
En el presente trabajo se ha eliminado cianuro en medio acuoso mediante la adición del H2O2 como agente oxidante, y mediante el proceso de la fotocatálisis heterogénea con óxido de titanio activado con radiación UV. El oxido de titanio fue sintetizado por el método Sol-Gel y la ruta de los Atranos, el cual fue caracterizado mediante las técnicas de Difracción de Rayos-X, Adsorción física de gas-N2, Espectroscopia de Reflectancia Difusa UV-vis, Microscopia Electrónica de Transmisión. Se evaluó el efecto de la cantidad de peróxido de hidrógeno (%V H2O2/V CN-=0,1; 0,5; 1,0 y 3%) en la eliminación de CN-. El óxido de titanio presenta buena actividad fotocatalítica como resultado de la relación estructura-propiedad: fase cristalina anatasa, adecuados tamaños de microdominio cristalino y alta área superficial. Se evaluó sistemas independientes para la eliminación de cianuro; CN-UV, CN-UV/H2O2 y CN-UV/TiO2. Finalmente, evaluamos el sistema combinado CN-UV//H2O2/TiO2, encontrando que el tiempo para la eliminación de cianuro es menor comparado a los sistemas independientes
In the present work, aqueous cyanide has been eliminated by addition of H2O2 as oxidant agent, and by heterogeneous photocatalysis with titanium oxide activated with UV radiation. The titanium oxide was synthesized by Sol-Gel method and Atrane route, it was characterized by X-ray Diffraction, Physical adsorption of gas N2, Spectroscopy of Reflectance Diffuse UV-vis, Electronic Microscopy of Transmission. It was evaluated the effect of hydrogen peroxide quantity (%V H2O2/V CN- 0.1; 0.5; 1.0 and 3.0 %) for CN- elimination. The titanium oxide presents a high activity due its own structure-property relation: anatase crystalline phase, adequate crystalline microdomine sizes and high area superficial. Independent systems were evaluated for cyanide elimination: CN-UV, CN-UV/H2O2 y CN-UV/TiO2. Finally, a combined system CN-UV/H2O2/TiO2 was tested, which presents the faster elimination of cyanide compared with the independent systems
In the present work, aqueous cyanide has been eliminated by addition of H2O2 as oxidant agent, and by heterogeneous photocatalysis with titanium oxide activated with UV radiation. The titanium oxide was synthesized by Sol-Gel method and Atrane route, it was characterized by X-ray Diffraction, Physical adsorption of gas N2, Spectroscopy of Reflectance Diffuse UV-vis, Electronic Microscopy of Transmission. It was evaluated the effect of hydrogen peroxide quantity (%V H2O2/V CN- 0.1; 0.5; 1.0 and 3.0 %) for CN- elimination. The titanium oxide presents a high activity due its own structure-property relation: anatase crystalline phase, adequate crystalline microdomine sizes and high area superficial. Independent systems were evaluated for cyanide elimination: CN-UV, CN-UV/H2O2 y CN-UV/TiO2. Finally, a combined system CN-UV/H2O2/TiO2 was tested, which presents the faster elimination of cyanide compared with the independent systems
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Vol. 28, No. 2