The influence of geometrical characteristics on the photocatalytic activity of TiO2 nanotube arrays for degradation of refractory organic pollutants in wastewater

Title
The influence of geometrical characteristics on the photocatalytic activity of TiO2 nanotube arrays for degradation of refractory organic pollutants in wastewater
Authors
김종오
Keywords
4-chlorobenzoic acid; bisphenol-A; carbamazepine; geometrical characteristics; photocatalytic reactivity; TiO2 nanotube array
Issue Date
2015-05
Publisher
IWA PUBLISHING
Citation
WATER SCIENCE AND TECHNOLOGY, v. 71, NO 9, Page. 1301-1309
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 m(2)/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 m(2)/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 (lambda(max) = 365 nm).
URI
http://wst.iwaponline.com/content/71/9/1301http://hdl.handle.net/20.500.11754/24792
ISSN
0273-1223; 1996-9732
DOI
http://dx.doi.org/10.2166/wst.2015.078
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ETC
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