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나노 구조 물리 연구단
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Solar-light photocatalytic disinfection using crystalline/amorphous low energy bandgap reduced TiO2

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Title
Solar-light photocatalytic disinfection using crystalline/amorphous low energy bandgap reduced TiO2
Author(s)
Young-Min Kim; Hee Min Hwang; Luyang Wang; Ikjoon Kim; Yeoheung Yoon; Hyoyoung Lee
Publication Date
2016-04
Journal
SCIENTIFIC REPORTS, v.6, no., pp.25212 -
Publisher
NATURE PUBLISHING GROUP
Abstract
A generation of reactive oxygen species (ROS) from TiO2 under solar light has been long sought since the ROS can disinfect organic pollutants. We found that newly developed crystalline/amorphous reduced TiO2 (rTiO2) that has low energy bandgap can effectively generate ROS under solar light and successfully remove a bloom of algae. The preparation of rTiO2 is a one-pot and mass productive solution-process reduction using lithium-ethylene diamine (Li-EDA) at room temperature. Interestingly only the rutile phase of TiO2 crystal was reduced, while the anatase phase even in case of both anatase/rutile phased TiO2 was not reduced. Only reduced TiO2 materials can generate ROS under solar light, which was confirmed by electron spin resonance. Among the three different types of Li-EDA treated TiO2 (anatase, rutile and both phased TiO2), the both phased rTiO2 showed the best performance to produce ROS. The generated ROS effectively removed the common green algae Chlamydomonas. This is the first report on algae degradation under solar light, proving the feasibility of commercially available products for disinfection.
URI
http://pr.ibs.re.kr/handle/8788114/2614
DOI
10.1038/srep25212
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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