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J Colloid Interface Sci. 2008 Jul 1;323(1):182-6. doi: 10.1016/j.jcis.2008.03.043. Epub 2008 Apr 29.

Preparation and photocatalytic properties of Fe3+-doped Ag@TiO2 core-shell nanoparticles.

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1
Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.

Abstract

Ag@TiO2 core-shell-type nanophotocatalysts have been prepared using a simple and convenient method. The products were characterized by TEM, XRD, and UV-vis spectra. To make the catalysts achieve the highest photocatalytic activity under UV light illumination, the Ag content of Ag@TiO2 was optimized. The results showed that Ag@TiO2-doped Fe3+ extend their absorption into the visible region. Among the Fe3+-doped samples, Ag@Fe-TiO2 with low Ag content showed higher photocatalytic activity under visible light illumination. An excessive added amount of Ag would reduce Fe3+ to Fe2+ and make them difficult to be incorporated into the lattice of titania. From the experiments, we found that Fe3+ ions could stabilize the Ag@TiO2 colloid by holding back the aggregation of the core-shell nanoparticles.

PMID:
18448112
DOI:
10.1016/j.jcis.2008.03.043
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