Using TiO2-biocharcoal for photodisinfection in water contaminated with Escherichia coli
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2023
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REUNIAO ANUAL DA FESBE, 37.; CONGRESSO ANUAL DA SBFIS, 58.; REUNIAO ANUAL DA SBNEC, 46.; REUNIAO ANUAL DA BRAVO, 21.; CONGRESSO DA SBBN, 14.; CONGRESSO DOHAD BRASIL, 2.
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Introdução:
Along the years water availability reduced as the population increased, polluted hydric bodies
became a very alarming problem. Due to the water availability and quality decay cientists developed
disinfection procesess as Advanced Oxidation Process (AOP). The use of a catalyst with
photocatalytic activity can enhance hydroxyl radicals (OH?) production for disinfection and
pollutants degradation. In this present work the TiO2-Biocharcoal is used to promote inactivation of
Escherichia coli on water; experiments proved that this disinfection system is sucessfull, indicating
that this can be a good alternative to existing water treatments.
Objetivos:
Evaluate the use of TiO2-Biocharcoal in the photodisinfection process in water contaminated by
Escherichia coli.
Métodos:
TiO2 synthesis using sol-gel process with titanium isopropoxide and Biocharcoal powder as a
biotemplate, after the acid hydrolisys the material suffered a drying process that lasted overnight at
a 100°C. The photodisinfection test occurred with the Escherichia coli strain DH5a grown in the
laboratory and 0.05 g of TiO2-Biocharcoal; both were added to a suspension in the experimental
reactor. The total reaction lasted for 60 minutes in the solar chamber with all parameters controlled.
The collected suspension aliquots started in the minute 0 before the reaction, the others in the
minutes 15, 30, 45 and 60 of agitation and light exposure. The Petri plated aliquots were on LB Agar
and after 16 hours of incubation the counting of the emerged colonies was made by the software
(OpenCFU). For bacterial counts and kinetic calculations 6 samples were selected for this work.
Resultados:
The Scanning Electron Microscopy (SEM) micrograph presented the TiO2-Biocharcoal enhanced
surface area and microstructure obtained by biotemplate addition in the synthesis of the catalyst,
also, the X-Ray Difratometry (XRD) indicated that the crystalline structure of the material correspond
with the anatase form which is the most suitable structure for photocatalysis. The bacterial inactivation percentage was above 90% for 1 hour of solar radiation exposure. Kinetics models
indicated better correspondence with the Hom model.
Conclusão:
The inactivation of the Escherichia coli strain DH5a was sucessfull with the adition of 0.05 g of TiO2-
Biocharcoal in the sample; this was confirmed by the photodisinfection kinetics studies. The use of
solar energy to promote disinfection is a sustainable alternative and generates less toxic products
than treatments based on the use of chlorine, representing an option for remote areas that do not
have infrastructure and access to conventional water treatments.
Como referenciar
FERRO, D.M.; KOTANI, P.O.; PAVARIN, L.; AFFONSO, R.; ORTIZ, N. Using TiO2-biocharcoal for photodisinfection in water contaminated with Escherichia coli. In: REUNIAO ANUAL DA FESBE, 37.; CONGRESSO ANUAL DA SBFIS, 58.; REUNIAO ANUAL DA SBNEC, 46.; REUNIAO ANUAL DA BRAVO, 21.; CONGRESSO DA SBBN, 14.; CONGRESSO DOHAD BRASIL, 2., 27-30 de agosto, 2023, Búzios, RJ. Resumo expandido... Campinas, SP: Galoá, 2023. Disponível em: https://repositorio.ipen.br/handle/123456789/47955. Acesso em: 11 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.