Silver–TiO2 nanocomposites: Synthesis and harmful algae bloom UV-photoelimination
| Autor: | Sung Hun Cho, Leticia M. Torres-Martínez, S. Obregón Alfaro, Vicente Rodríguez-González, Soo-Wohn Lee |
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| Rok vydání: | 2010 |
| Předmět: |
Anatase
Materials science Process Chemistry and Technology Inorganic chemistry chemistry.chemical_element Nanoparticle Catalysis Silver nanoparticle Titanium oxide Silver nitrate chemistry.chemical_compound chemistry Chemical engineering Alkoxide Photocatalysis General Environmental Science Titanium |
| Zdroj: | Applied Catalysis B: Environmental. 98:229-234 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2010.06.001 |
| Popis: | Silver TiO 2 nanocomposites were synthesized by two methods: silver UV photodeposition (Ag/P25) and a sol–gel process incorporating silver nitrate during the titanium alkoxide gelling step (TiO 2 -Ag). The obtained nanocomposites were characterized by means of XRD, N 2 adsorption, XPS, and DRS. All the silver-TiO 2 semiconductors have anatase as the principal crystalline TiO 2 phase and the average band gap was found in the edge of the visible–ultraviolet region (3.26 eV). According to XPS and HAADF-STEM studies, highly dispersed silver nanoparticles were found on the titania surface as Ag°. The photocatalytic effects of the silver TiO 2 nanocomposites on the killing of marine algae were examined by using either Amphidinium carterae (red tide) or noxious Tetraselmis suecica (green tide) as a probe. After 1 h under UV irradiation, both harmful algae were inactivated by the silver nanocomposites. The fatal damages to these microorganisms induced by the TiO 2 -Ag sol–gel semiconductor occurred faster than those promoted by the Ag/P25 and TiO 2 sol–gel isolated supports. In addition to the biocide properties of silver in aqueous medium, the silver nanoparticles acted as electron traps, retarding electron–hole recombination, which enhanced the photocatalytic activity. |
| Databáze: | OpenAIRE |
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