title: The influence of geometrical characteristics on the photocatalytic activity of TiO2 nanotube arrays for degradation of refractory organic pollutants in wastewater.
abstract: The effects of geometrical characteristics such as surface area (SA) and porosity of TiO2 nanotube arrays (TNAs) on its photocatalytic activity were investigated by applying variable voltages and reaction times for the anodization of Ti substrates. While larger SA of nanotubes was observed under higher applied potential, the porosity of TNAs decreased by increasing anodizing voltage. Under applied potential of 80 V, the SA of TNAs increased from 0.164 to 0.471 m2/g as anodization time increased from 1 to 5 hours, respectively. However, no significant effect on the porosity of TNAs was observed. On the other hand, both SA and porosity of TNAs, synthesized at 60 V, increased by augmenting the anodization time from 1 to 3 hours. But further increasing of anodization time to 5 hours resulted in a decreased SA of TNAs with no effect on their porosity. Accordingly, the TNAs with SA of 0.368 m2/g and porosity of 47% showed the highest photocatalytic activity for degradation of 4-chlorobenzoic acid (4CBA). Finally, the degradation of refractory model compounds such as carbamazepine and bisphenol-A was tested and more than 50% of both compounds could be degraded under UV-A irradiation (λmax=365 nm).
authors.affiliation: School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia.
authors.forename: T
authors.initials: T
authors.lastname: Noeiaghaei
authors.affiliation: Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: J-H
authors.initials: JH
authors.lastname: Yun
authors.affiliation: Department of Environmental Health, School of Public Health, Seoul National University, Seoul 151-742, South Korea.
authors.forename: S W
authors.initials: SW
authors.lastname: Nam
authors.affiliation: Department of Environmental Health, School of Public Health, Seoul National University, Seoul 151-742, South Korea.
authors.forename: K D
authors.initials: KD
authors.lastname: Zoh
authors.affiliation: School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia.
authors.forename: V G
authors.initials: VG
authors.lastname: Gomes
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-792, Republic of Korea.
authors.forename: J O
authors.initials: JO
authors.lastname: Kim
authors.affiliation: Department of Biomedical, Chemical, and Environmental Engineering, 701 Engineering Research Center, University of Cincinnati, Cincinnati, Ohio 45221-0012, USA E-mail: chaesg@ucmail.uc.edu.
authors.forename: S R
authors.initials: SR
authors.lastname: Chae
mesh_terms: D002723:Chlorobenzoates / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010782:Photolysis; D016062:Porosity; D014025:Titanium / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002723:Chlorobenzoates; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C040768:4-chlorobenzoic acid