Atividade Fotocatalítica de Nanotubos de Titanatos frente a bactérias

Detalhes bibliográficos
Ano de defesa: 2009
Autor(a) principal: Carmo, Jose Dilmar Obregon do
Orientador(a): Hoelzel, Solange Cristina da Silva Martins
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Franciscana
Programa de Pós-Graduação: Mestrado Acadêmico em Nanociências
Departamento: Biociências e Nanomateriais
País: BR
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/264
http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/281
Resumo: 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.