Resumo

ARANGO-PARRADO, A. et al. Elaboración de películas de TiO₂ por sedimentación para el pos-tratamiento de un efluente anaeróbico generado en un relleno sanitario. Superf. vacío [online]. 2009, vol.22, n.2, pp.10-16. ISSN 1665-3521.

Films of TiO₂ were deposited over glass substrates using sedimentation under acidity conditions in order to evaluate in laboratory conditions the COD, colour and faecal coliforms removal in pre-treated leaching for anaerobic digestion. In agreement with the ANOVA results of factorial design 2², the interaction of X₁ (Number of cycles of growth associated with sedimentations) and X₂ (Steeping time of the TiO₂) did not have a significant effect on the glass adhered milligrams of TiO₂ (p = 0,138). Nevertheless, X₁ factor in its high level (Two cycles made up of: 2 sedimentations of 1 h and 2 calcinations of 1 h to 450 °C) results in a significant effect (p < 0.0001) adhering 7.42 mg/cm² of TiO₂ on the glass substrate . The films displayed a rough, irregular surface and presented small fractures. The X-ray diffractograms of these were TiO₂ films showed the presence of the phases rutile (110), (101) and anatase (101), (200), (211) and (004), which intensified after the heat treatment. In the photocatalytic curves the results were 26 %, 40 % and 60 % the colour, COD and faecal coliforms removal respect at 12 h.

Palavras-chave : TiO₂ films; Photocatalysis; Colour removal; Chemical oxygen demand and faecales coliforms.

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