Atividade Fotocatalítica de Nanotubos de Titanatos frente a bactérias

• Autor(a) principal: Carmo, Jose Dilmar Obregon do
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional Universidade Franciscana
• Texto Completo: http://tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/264; http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/281
• topic: Atividade antimicrobiana; Difusão em Agar; Fotocátalise; Titanatos; Antimicrobial activity; Photocatalytic activity; Diffusion Agar; Titanate; CNPQ::ENGENHARIAS

The titanium oxide (TiO2) is known as a material of excellent photocatalytic activity and its applications in fields that involve the removal of gases, decomposition of organic compounds, water purification and decomposition of pollutants. The nanotubes of titania and titanates have attracted particular attention in the scientific world because of its potential for application by submitting a larger surface area and number of hydroxyl groups when compared to the precursor oxide (TiO2), opening a new horizon for implementation, especially for photocatalysis. This study aimed to evaluate the photocatalytic performance of samples of inorganic nanotubes of formula NTTi, NTTiH, NTTiOx NTTi-Ag, NTTiH-Ag and Ag-NTTiH on effect of ultraviolet light, before the bacteria Escherichia coli (ATCC 12228) and Staphylococcus aureus (ATCC 6538) as a model, well known for being the point genetic. The results found in this work, agree with most publications viewed until now. Samples NTTi-Ag, NTTiH-Ag and Ag-NTTiH, showed better photocatalytic effect, shown in the diffusion test on Mueller Hinton agar, when compared to the halo of inhibition of the antibiotic ampicillin. And there was a low performance of the titanates nanotubes (TTNT), specially of the show NTTi, NTTiH and NTTiOx front the bacteria Escherichia coli and Staphylococcus aureus, probably due to structural form of nanotubes, probably favoring greater recombination of electron pair/gap (e¯/h+). The results at times 60/90/120 min, should be probably the effect of ultraviolet light (λ 365 nm) and not the effect of the nanotubes and ultraviolet light. The samples with silver showed a halo of inhibition around 1 to 3 mm, more than 5 mm of the hole where they were placed in 50μl solution of microorganisms Escherichia coli and Staphylococcus aureus. This part of the study observed the synergism of the nanotubes with silver and ultraviolet light at all times.