期刊
APPLIED CATALYSIS A-GENERAL
卷 323, 期 -, 页码 51-57出版社
ELSEVIER
DOI: 10.1016/j.apcata.2007.01.047
关键词
nickel nanoparticles; lower alkylammonium bromide; aqueous medium; p-nitrophenol; catalysis; p-aminophenol
Heterogeneous synthesis of monodisperse pure nickel nanoparticles in aqueous medium has been carried out using cetyltrimethylammonium bromide and a lower alkylammonium bromide mixture of tetraethylammonium bromide and tetrabutylammonium bromide. The presence of cetyltrimethylammonium bromide alone results in the formation of a mixture of nickel hydroxide and nickel nanoparticles. The particles have been characterized using TEM, EDS, XRD, TGA-DSC and FTIR. The analysis showed that particles are spherical in shape, monodisperse, face-centered-cubic with average size about 15 nm and are stable in air up to 325 degrees C. The nanoparticles have been used as a solid phase catalyst for the reduction of p-nitrophenol in the presence of hydrazine hydrate as reducing agent at different temperatures under varying conditions. The reduction process has been monitored by UV-vis analysis. The present study showed that nanoparticles are not poisoned after their repeated use in reduction of p-nitrophenol to p-aminophenol. TEM analysis also confirms that nanoparticles are stable in the dispersed medium for longer times. (C) 2007 Elsevier B.V. All rights reserved.
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