Advanced nanoporous TiO2 photocatalysts by hydrogen plasma for efficient solar-light photocatalytic application

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Title
Advanced nanoporous TiO2 photocatalysts by hydrogen plasma for efficient solar-light photocatalytic application
Author(s)
H R An; S Y Park; H Kim; C Y Lee; Saehae Choi; S C Lee; S Seo; E C Park; Y K Oh; C G Song; J Won; Y J Kim; J Lee; H U Lee; Y C Lee
Bibliographic Citation
Scientific Reports, vol. 6, pp. 29683-29683
Publication Year
2016
Abstract
We report an effect involving hydrogen (H 2)-plasma-treated nanoporous TiO2 (H-TiO2) photocatalysts that improve photocatalytic performance under solar-light illumination. H-TiO2 photocatalysts were prepared by application of hydrogen plasma of assynthesized TiO2 (a-TiO2) without annealing process. Compared with the a-TiO2, the H-TiO2 exhibited high anatase/brookite bicrystallinity and a porous structure. Our study demonstrated that H 2 plasma is a simple strategy to fabricate H-TiO2 covering a large surface area that offers many active sites for the extension of the adsorption spectra from ultraviolet (UV) to visible range. Notably, the H-TiO2 showed strong ·OH free-radical generation on the TiO2 surface under both UV- and visible-light irradiation with a large responsive surface area, which enhanced photocatalytic efficiency. Under solar-light irradiation, the optimized H-TiO2 120(H 2 -plasma treatment time: 120 min) photocatalysts showed unprecedentedly excellent removal capability for phenol (Ph), reactive black 5(RB 5), rhodamine B (Rho B) and methylene blue (MB)-approximately four-times higher than those of the other photocatalysts (a-TiO2 and P25)-resulting in complete purification of the water. Such well-purified water (>90%) can utilize culturing of cervical cancer cells (HeLa), breast cancer cells (MCF-7), and keratinocyte cells (HaCaT) while showing minimal cytotoxicity. Significantly, H-TiO2 photocatalysts can be mass-produced and easily processed at room temperature. We believe this novel method can find important environmental and biomedical applications.
ISSN
2045-2322
Publisher
Springer-Nature Pub Group
DOI
http://dx.doi.org/10.1038/srep29683
Type
Article
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1. Journal Articles > Journal Articles
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