Visible light sensitization of TiO2 nanoparticles by a dietary pigment,curcumin, for environmental photochemical transformations

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486915.do
DOI
10.1039/c7ra05276f
Title
Visible light sensitization of TiO2 nanoparticles by a dietary pigment,curcumin, for environmental photochemical transformations
Description
This work was supported by Global Research Laboratory (GRL) Program(NRF-2014K1A1A2041044) and KCAP (Sogang Univ.) (2009-0093880), whichwere funded by the Korea Government (MSIP) through the National ResearchFoundation (NRF).
abstract
The use of curcumin, an active ingredient of turmeric powder (a dye component in curry), as a TiO2 photosensitizer was investigated in terms of the photochemical and photoelectrochemical (PEC) properties. Owing to its strong visible light absorption and strong surface complexation, the curcumin-sensitized TiO2 composite exhibited notable activities for the photochemical degradation of organic compounds, the reduction of chromate (Cr(VI)), and the generation of OH radicals and H2O2 through the reduction of O-2 under visible light (lambda > 420 nm). Various spectroscopic methods confirmed the anchoring of curcumin on TiO2 and the photochemical and PEC properties of curcumin/TiO2 were compared with those of TiO2 sensitized by a ruthenium complex (RuL3) that has been frequently employed as a visible light sensitizer. Curcumin/TiO2 exhibited consistently higher photochemical and PEC activities than RuL3/TiO2 over a wide pH range in an aquatic environment. These results confirm the practical viability of using a natural food dye, curcumin, as an efficient, eco-friendly, and cheap photo-sensitizer of TiO2 for solar environmental applications. However, it should be noted that curcumin on TiO2 like other dye sensitizers is degraded as a result of the sensitizing reactions in water and should be considered as a sensitizing reagent, not a photocatalyst.
provenance
Made available in Cube on 2018-09-28T16:20:19Z (GMT). No. of bitstreams: 0
language
English
author
Lim, Jonghun
Bokare, Alok D.
Choi, Wonyong
orcid
Choi, Wonyong/0000-0003-1801-9386; Bokare, Alok D./0000-0002-1008-2252
accessioned
2018-09-28T16:20:19Z
available
2018-09-28T16:20:19Z
issued
2017
citation
RSC ADVANCES(7): 52
issn
2046-2069
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486915.do
Funder
교육부
Funding Program
BK21플러스사업(0.5)
Project ID
1345274225
Jurisdiction
Rep.of Korea
Project Name
Global Nexus for Environment-Energy-Climate (GNE2C)
rights
openAccess
type
article


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