Microbiology cell-staining wastewater treatment using T iO 2 thin films

(Eng) Microbiology cell-staining wastewater was treated by UV/TiO 2 thin films photocatalysis. A simple method of applying gravity sedimentation over grass-type substrate was used for the preparation of the films. The use of Na4 P2 O7, microwaves, and ultrasounds were studied for decreasing the TiO2...

Full description

Autores:
Fernández, Jorge A.
Cardozo, Magda G.
Carrascal, Ana K.
Salcedo, Juan C.
Pedroza, Aura M.
Daza, Carlos E.
Tipo de recurso:
Article of journal
Fecha de publicación:
2015
Institución:
Universidad del Valle
Repositorio:
Repositorio Digital Univalle
Idioma:
eng
OAI Identifier:
oai:bibliotecadigital.univalle.edu.co:10893/17727
Acceso en línea:
https://hdl.handle.net/10893/17727
Palabra clave:
Bacteria
Decolorization
Mineralization
Photocatalysis
Wastewater
Agua residual
Bacteria
Decoloración
Fotocatálisis
Mineralización
Agua residual
Bacteria
Decoloración
Fotocatálisis
Mineralización
Rights
closedAccess
License
http://purl.org/coar/access_right/c_14cb
Description
Summary:(Eng) Microbiology cell-staining wastewater was treated by UV/TiO 2 thin films photocatalysis. A simple method of applying gravity sedimentation over grass-type substrate was used for the preparation of the films. The use of Na4 P2 O7, 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-film 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 was completed.