Solar-light photocatalytic disinfection using crystalline/amorphous low energy bandgap reduced TiO2.

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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kim Y,Hwang HM,Wang L,Kim I,Yoon Y,Lee H

doi

10.1038/srep25212

subject

Has Abstract

pub_date

2016-04-28 00:00:00

pages

25212

issn

2045-2322

pii

srep25212

journal_volume

6

pub_type

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