1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water

TiO2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis...

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Autores principales: Cabrera, J., Acosta, D., López, A., Candal, R.J., Marchi, C., García, P., Ríos, D., Rodriguez, J.M.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1110662X_v2018_n_p_Cabrera
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1110662X_v2018_n_p_Cabrera2023-10-03T16:06:37Z 1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water Cabrera, J. Acosta, D. López, A. Candal, R.J. Marchi, C. García, P. Ríos, D. Rodriguez, J.M. TiO2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis). The anatase proportion in the precursor nanoparticles was in the 3-100% range. Tube-like nanostructures were obtained with an anatase percentage of 18 or higher while flake-like shapes were obtained when rutile was dominant in the seed. After annealing at 400°C for 2 h, a fraction of nanotubes was conserved in all the samples but, depending on the anatase/rutile ratio in the starting material, spherical and rod-shaped structures were also observed. The photocatalytic activity of 1D nanostructures was evaluated by measuring the deactivation of E. coli in stirred water in the dark and under UV-A/B irradiation. Results show that in addition to the bactericidal activity of TiO2 under UV-A illumination, under dark conditions, the decrease in bacteria viability is ascribed to mechanical stress due to stirring. © 2018 Julieta Cabrera et al. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1110662X_v2018_n_p_Cabrera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description TiO2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis). The anatase proportion in the precursor nanoparticles was in the 3-100% range. Tube-like nanostructures were obtained with an anatase percentage of 18 or higher while flake-like shapes were obtained when rutile was dominant in the seed. After annealing at 400°C for 2 h, a fraction of nanotubes was conserved in all the samples but, depending on the anatase/rutile ratio in the starting material, spherical and rod-shaped structures were also observed. The photocatalytic activity of 1D nanostructures was evaluated by measuring the deactivation of E. coli in stirred water in the dark and under UV-A/B irradiation. Results show that in addition to the bactericidal activity of TiO2 under UV-A illumination, under dark conditions, the decrease in bacteria viability is ascribed to mechanical stress due to stirring. © 2018 Julieta Cabrera et al.
format JOUR
author Cabrera, J.
Acosta, D.
López, A.
Candal, R.J.
Marchi, C.
García, P.
Ríos, D.
Rodriguez, J.M.
spellingShingle Cabrera, J.
Acosta, D.
López, A.
Candal, R.J.
Marchi, C.
García, P.
Ríos, D.
Rodriguez, J.M.
1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water
author_facet Cabrera, J.
Acosta, D.
López, A.
Candal, R.J.
Marchi, C.
García, P.
Ríos, D.
Rodriguez, J.M.
author_sort Cabrera, J.
title 1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water
title_short 1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water
title_full 1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water
title_fullStr 1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water
title_full_unstemmed 1D TiO2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for Escherichia coli in water
title_sort 1d tio2 nanostructures prepared from seeds presenting tailored tio2 crystalline phases and their photocatalytic activity for escherichia coli in water
url http://hdl.handle.net/20.500.12110/paper_1110662X_v2018_n_p_Cabrera
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