Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 3, Pages 2197-2203Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj03798h
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Funding
- National Natural Science Foundation of China [21403274, 21503259, 11474101, 21373255]
- Chinese Academy of Sciences [2015YCR001]
- Fundamental Research Funds for the Central Universities [2015ZM151]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
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A simple, clean, and efficient synthesis method has been developed for deposition of similar to 3 nm monodisperse naked'' gold nanoparticles (Au NPs) onto cellulose nanocrystal-graphene (CNC-G) hybrid sheets without the use of additional reducing and capping agents. The as-prepared catalysts (Au@CNC-G) were examined using FT-IR spectroscopy, thermogravimetric analysis (TGA), atomic force microscopy, electron microscopy, wide-angle X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). After some optimization, the Au@CNC-G catalyst exhibited robust catalytic activity, impressive stability, and good flexibility for the one-pot'' reaction of an alkyne, an amine, and an aldehyde (A(3)-coupling) in water. The catalytic activity of the Au@CNC-G catalyst could be attributed to the synergistic effect derived from the coexistence of CNC and graphene. The Au3+ ions could be in situ reduced to create fine Au NPs and simultaneously anchored on the surface of CNC-G hybrid sheets through coordination, leading to the uniform dispersion of the Au NPs. Moreover, the Au@CNC-G catalyst could be conveniently recycled and reused many times, thus lowering the cost and minimizing the environmental pollution caused by organic solvents and heavy metal ions.
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