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Microbiology cell-staining wastewater was treated by UV/TiO2 thin films photocatalysis. A simple method of applying gravity sedimentation over glass–type substrate was used for the preparation of the films. The use of Na4P2O7, microwaves, and ultrasounds were studied for decreasing the TiO2 grain sizes on the films. It was established that the best method for reducing grain size resulted from a combination of Na4P2O7 (0.01M) and microwave radiation (700 W, 20 min). The Films were characterized by several microscopic and spectroscopic methods. Anatase phase (gap energy of 3.2 eV) and grain sizes averaging 83 nm were achieved. Photocatalysis tests using TiO2–films showed 99.5 % of decolorization, 79% TOC abatement, and total microbial inactivation after 14 h of treatment. No bacteria re–growth was found 48 h after the treatment as completed.

Jorge A. Fernández, Pontificia Universidad Javeriana

Grupo de Biotecnología Ambiental e Industrial, Grupo de Películas Delgadas y Nanofotónica

Magda G. Cardozo, Pontificia Universidad Javeriana

Grupo de Biotecnología Ambiental e Industrial

Ana K. Carrascal, Pontificia Universidad Javeriana

Grupo de Biotecnología Ambiental e Industrial

Juan C. Salcedo, Universidad Nacional de Colombia

Grupo de Películas Delgadas y Nanofotónica

Aura M. Pedroza, Pontificia Universidad Javeriana

Grupo de Biotecnología Ambiental e Industrial
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Fernández JA, Cardozo MG, Carrascal AK, Salcedo JC, Pedroza AM, Daza CE. Microbiology cell-staining wastewater treatment using TiO2 thin films. inycomp [Internet]. 2015 Jun. 19 [cited 2024 Nov. 21];17(1):35-48. Available from: https://revistaingenieria.univalle.edu.co/index.php/ingenieria_y_competitividad/article/view/2199