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Molecules 2013, 18(10), 12609-12620; doi:10.3390/molecules181012609

Size Effect of Gold Nanoparticles in Catalytic Reduction of p-Nitrophenol with NaBH4

1,2, 1, 2,* , 3,*  and 1,*
1 Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China 2 Department of Physics, Faculty of Science, Ningbo University, Ningbo 315211, China 3 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
* Authors to whom correspondence should be addressed.
Received: 2 September 2013 / Revised: 1 October 2013 / Accepted: 6 October 2013 / Published: 11 October 2013
(This article belongs to the Section Organic Synthesis)
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Gold nanoparticles (Au NPs) were prepared by reducing HAuCl4 with NaBH4. Their average particle sizes could be tuned in the range of 1.7 and 8.2 nm, by adjusting the amount of NaBH4 used during synthesis. The obtained Au NPs (colloids) were then loaded onto a commercial Al2O3 support to prepare Au/Al2O3 catalysts with tunable Au particle sizes. An optimal pH value (5.9) of the Au colloid solution was found to be essential for loading Au NPs onto Al2O3 while avoiding the growth of Au NPs. Au NPs and Au/Al2O3 catalysts were tested in the reduction of p-nitrophenol with NaBH4. Interestingly, the catalytic activity depended on the size of Au NPs, being the highest when the average size was 3.4 nm. Relevant characterization by UV-Vis, TEM, and XRD was conducted.
Keywords: gold catalysts; alumina; p-nitrophenol; nanoparticles; size effect gold catalysts; alumina; p-nitrophenol; nanoparticles; size effect
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lin, C.; Tao, K.; Hua, D.; Ma, Z.; Zhou, S. Size Effect of Gold Nanoparticles in Catalytic Reduction of p-Nitrophenol with NaBH4. Molecules 2013, 18, 12609-12620.

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