Document Detail


Understanding the High Photocatalytic Activity of (B, Ag)-codoped TiO2 under Solar-light Irradiation with XPS, Solid-state NMR and DFT Calculations.
MedLine Citation:
PMID:  23316875     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The origin of the exceptionally high activity of (B, Ag)-codoped TiO2 catalysts under solar-light irradiation has been investigated by XPS and 11B solid-state NMR spectroscopy in conjunction with density functional theory (DFT) calculations. XPS experimental results demonstrated that a portion of the dopant Ag (Ag3+) ions were implanted into the crystalline lattice of (B, Ag)-codoped TiO2 and were in close proximity to the interstitial B (Bint.) sites, forming [Bint.-O-Ag] structural units. In-situ XPS experiments were employed to follow the evolution of the chemical states of the B and Ag dopants during Uv-Vis irradiation. It was found that the [Bint.-O-Ag] units could trap the photoinduced electron to form an unique intermediate structure in the (B, Ag)-codoped TiO2 during the irradiation, which is responsible for the photoinduced shifts of the B 1s and Ag 3d peaks observed in the in-situ XPS spectra. Solid-state NMR experiments including 11B triple-quantum and double-quantum magic angle spinning (MAS) NMR revealed that up to six different boron species were present in the catalysts and only the tri-coordinated interstitial boron (T*) species was in close proximity to the substitutional Ag species, leading to formation of [T*-O-Ag] structural units. Furthermore, as demonstrated by DFT calculations, the [T*-O-Ag] structural units were responsible for trapping the photoinduced electrons, which prolongs the life of the photoinduced charge carriers and eventually leads to a remarkable enhancement in the photocatalytic activity. All these unprecedented findings are expected to be crucial for understanding the roles of B and Ag dopants and their synergy effect in numerous titania-mediated photocatalytic reactions.
Authors:
Ningdong Feng; Qiang Wang; Anmin Zheng; Zhengfeng Zhang; Jie Fan; Shang-Bin Liu; Jean-Paul Amoureux; Feng Deng
Related Documents :
20946555 - Identification of gender-related normality regions for t-wave alternans.
23171595 - Micronutrients in age-related macular degeneration.
2340955 - Sexual segregation in the left and right horns of the gerbil uterus: "the male embryo i...
20837035 - Partner preference for strain of female in long-evans male rats.
15818695 - Factors associated with hip cartilage volume measured by magnetic resonance imaging: th...
2612195 - Aging and sex-related changes in the outer retina of japanese quail.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Effects of Sulfate Reduction on the Bacterial Community and Kinetic Parameters of a Dechlorinating C...
Next Document:  Iron Deficiency Anemia and Levels of Oxidative Stress Induced by Treatment Modalities.