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Información tecnológica

On-line version ISSN 0718-0764


LOPEZ-VASQUEZ, Andrés; ALMANZA, Ovidio; ACOSTA, Manuel F  and  SUAREZ-ESCOBAR, Andrés. Photocatalytic Degradation of Organic Pollutants from Printing Wastewater by Bismuth(NI) Oxide/Titanium Oxide (Bi2O3/TiO2). Inf. tecnol. [online]. 2016, vol.27, n.1, pp.147-158. ISSN 0718-0764.

Coupled 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.

Keywords : wastewater; printing industry; photocatalytic degradation; Bi2O3/TiO2; surface response.

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