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espanolSe prepararon semiconductores acoplados de Bi2O3/TiO2 mediante el metodo de impregnacion humeda. La actividad fotocatalitica se evaluo sobre la degradacion de compuestos organicos presentes en agua residual generada por la industria litografica bajo irradiacion UV-visible y fueron caracterizados mediante difraccion de rayos x, espectroscopia UV visible e infrarroja. Se utilizo la metodologia de superficie de respuesta a traves de un diseno factorial de tres niveles para evaluar el efecto combinado de la relacion Bi2O3/TiO2 y el pH inicial de la solucion. Las respuestas evaluadas fueron los porcentajes de remocion de carbono organico total y Demanda Quimica de Oxigeno. Los resultados revelaron que los materiales compuestos (composites) de Bi2O3/TiO2 mostraron un menor tamano de cristal, mayor estabilidad termica y una mayor absorcion en el rango visible que el TiO2 puro. EnglishCoupled semiconductors of Bi2O3/TiO2 were synthetized by wet impregnation. Photocatalytic activity was evaluated upon the removal of organic pollutants presents in lithographic wastewater under UV-vis radiation. Catalyst were characterized by X ray diffraction, diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy. Response surface methodology was employed with two factors in three to evaluate the combined effect of the ratio Bi2O3/TiO2 and the initial pH of the solution. The responses evaluated were the removal percentages of total organic carbon and chemical oxygen demand. The results showed that Bi2O3/TiO2 composites have smaller crystal size, higher thermal stability and a higher absorption in the visible range than pure TiO2.

información tecnológica

Degradación Fotocatalítica de Contaminantes Orgánicos Presentes en Agua Residual de la Industria Litográfica mediante Oxido de Bismuto(NI)/Oxido de Titanio (Bi2O3/TiO2)