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Silver–TiO2 nanocomposites: Synthesis and harmful algae bloom UV-photoelimination

Paper ID Volume ID Publish Year Pages File Format Full-Text
47268 46465 2010 6 PDF Available
Title
Silver–TiO2 nanocomposites: Synthesis and harmful algae bloom UV-photoelimination
Abstract

Silver TiO2 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 (TiO2-Ag). The obtained nanocomposites were characterized by means of XRD, N2 adsorption, XPS, and DRS. All the silver-TiO2 semiconductors have anatase as the principal crystalline TiO2 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 TiO2 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 TiO2-Ag sol–gel semiconductor occurred faster than those promoted by the Ag/P25 and TiO2 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.

Graphical abstractThe photocatalytic effects of the silver TiO2 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 the green tide induced by the TiO2–Ag sol–gel semiconductor occurred faster than those promoted by the photodeposited Ag/P25 and TiO2 sol–gel isolated supports.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
TiO2 sol–gel; Silver nanoparticles; Harmful algae bloom; Silver photodeposition
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Silver–TiO2 nanocomposites: Synthesis and harmful algae bloom UV-photoelimination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 98, Issues 3–4, 1 August 2010, Pages 229–234
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us