Characterization on titanium surfaces and its effect on photocatalytic bactericidal activity

Title
Characterization on titanium surfaces and its effect on photocatalytic bactericidal activity
Authors
Joo Hyeon CheolLim Young JunKim Myung JooKwon Ho Beom한준현
Keywords
Titanium dioxide; Photocatalyst; anatage; UV illumination; bactericidal effect; *2010기관고유사업 평가에 반영 완료
Issue Date
2010-10
Publisher
Applied surface science
Citation
VOL 257, NO 3, 741-746
Abstract
Many studies have been published on the use of TiO2 as a photocatalyst, which decomposes various organic compounds under UV illumination by generating various radicals. The purpose of the present study was to evaluate the photocatalytic bactericidal effects of variously treated titanium surfaces on Escherichia coli K-12. The specimens were fabricated from grade 4 commercially pure titanium, 12 mm in diameter and 1 mm in thickness. Five different surfaces were prepared (MA: machined surface; AO: anodized at 300 V; NO: NaOH-treated; NW: NaOH- and water-treated; and HT: heat-treated). Surface analysis was performed using scanning electron microscopy, optical interferometer, and thin-film X-ray diffractometry. Photocatalytic activity of each group was confirmed by degradation of methylene blue (MB). The antibacterial activity was assessed by calculating the survival ratio in a drop of a culture of E. coli placed on the surface under UV illumination. Significant photocatalytic activity and bactericidal effects were observed on the titanium surfaces of AO and NW, regardless of the surface roughness (P < 0.01). The group with anatase was the most susceptible to the photocatalytic effect, while the surface without anatase showed the least susceptibility. Based on this in vitro study, the crystallography of the oxide layer on its titanium surfaces is an important factor affecting the photocatalytic bactericidal activity.
URI
http://pubs.kist.re.kr/handle/201004/38112
ISSN
0169-4332
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KIST Publication > Article
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