| Low-frequency ultrasound induces oxygen vacancies formation and visible light absorption in TiO(2) P-25 nanoparticles. | |
| | |
MedLine Citation:
|
PMID: 22192787 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Low-frequency ultrasound (LFUS) irradiation induces morphological, optical and surface changes in the commercial nano-TiO(2)-based photocatalyst, Evonik-Degussa P-25. Low-temperature electron spin resonance (ESR) measurements performed on this material provided the first experimental evidence for the formation of oxygen vacancies (V(o)), which were also found responsible for the visible-light absorption. The V(o) surface defects might result from high-speed inter-particle collisions and shock waves generated by LFUS sonication impacting the TiO(2) particles. This is in contrast to a number of well-established technologies, where the formation of oxygen vacancies on the TiO(2) surface often requires harsh technological conditions and complicated procedures, such as annealing at high temperatures, radio-frequency-induced plasma or ion sputtering. Thus, this study reports for the first time the preparation of visible-light responsive TiO(2)-based photocatalysts by using a simple LFUS-based approach to induce oxygen vacancies at the nano-TiO(2) surface. These findings might open new avenues for synthesis of novel nano-TiO(2)-based photocatalysts capable of destroying water or airborne pollutants and microorganisms under visible light illumination. |
| | |
Authors:
|
Paula A Osorio-Vargas; Cesar Pulgarin; Andrzej Sienkiewicz; Luis R Pizzio; Mirta N Blanco; Ricardo A Torres-Palma; Christian Pétrier; Julián A Rengifo-Herrera |
Related Documents
:
|
16657627 - The effect of red irradiation on plastid ribosomal rna synthesis in dark-grown pea seed... 16662137 - Promotion by gibberellic acid of polyamine biosynthesis in internodes of light-grown dw... 16593557 - Modified cryptochrome in vivo absorption in dim photosporulation mutants of trichoderma. 22490557 - Stimulus repetition affects both strength and synchrony of macaque inferior temporal co... 10935917 - Synergy in a neural code. 10444297 - I5m: 3d widefield light microscopy with better than 100 nm axial resolution. |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-12-2 |
Journal Detail:
|
Title: Ultrasonics sonochemistry Volume: - ISSN: 1873-2828 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
|
Created Date: 2011-12-23 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9433356 Medline TA: Ultrason Sonochem Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
|
Copyright © 2011 Elsevier B.V. All rights reserved. |
Affiliation:
|
SB-ISIC-GGEC, Station 6, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. |
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: Tuberculosis-like pneumonias by the aerobic actinomycetes Rhodococcus, Tsukamurella and Gordonia.
Next Document: Understanding active and passive users: The effects of an active user using normal, hard and unrelia...