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Solar photocatalytic and electrokinetic studies of TiO2/Ag nanoparticle suspensions

Journal article
Authors Emil Schüler
Anna-Karin Gustavsson
Simon Hertenberger
Klaus Sattler
Published in Solar Energy
Volume 96
Pages 220-226
ISSN 0038-092X
Publication year 2013
Published at Institute of Clinical Sciences, Department of Radiation Physics
Department of Physics (GU)
Pages 220-226
Language en
Links dx.doi.org/10.1016/j.solener.2013.0...
Keywords Photodegradation, Solar photocatalysis, Nanoparticles, TiO2, Nanocomposites, Zeta potential
Subject categories Chemical physics, Semiconductor physics, Surfaces and interfaces, Electronic structure, Water Treatment, Nano Technology, Surface and colloid chemistry

Abstract

Composites of TiO2 and Ag nanoparticles were used to study photodegradation of aqueous Rhodamine B under natural sunlight exposure. The addition of Ag powder resulted in a ∼45% increase of the photocatalytic activity of TiO2 after 30 min, which is attributed to the suppression of the photo-generated electron–hole pair recombination. Electrokinetic studies on TiO2, Ag, and TiO2/Ag aqueous solutions address the question of how the electron transfer occurs. It was found that the TiO2 and TiO2/Ag zeta potential versus pH behavior is virtually identical which suggests that the Ag particles are encapsulated by the TiO2 particles, allowing the electron transfer across the ‘static’ semiconductor–metal interface.

Page Manager: Webmaster|Last update: 9/11/2012
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