Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 22, Pages 8491-8499Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00632a
Keywords
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Funding
- National Natural Science Foundation of China [50973085, 51273151]
- Program for New Century Excellent Talents in University [NCET-11-0415]
- National Basic Research Program of China (973 Program) [2010CB732203]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
- Fundamental Research Funds for the Central Universities
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In this work, we presented an environmentally friendly approach for the immobilization of high-density silver nanoparticles (Ag NPs) on the negatively charged surface of alginate (AL) microspheres. Quaternized cellulose (QC)-Ag nanocomposites are subsequently deposited onto the surface of AL microspheres through the electrostatic interaction between QC and AL. The density of Ag NPs immobilized on the surface of AL microspheres could be altered by varying the Ag content in QC-Ag nanocomposites. Optical microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis, transmission electron microscopy and scanning electron microscopy were employed to follow all preparation steps and to characterize the resulting functional surfaces. The catalytic activity of the composite microspheres was evaluated by reduction of p-nitrophenol to p-aminophenol by NaBH4. The results demonstrated that the obtained microspheres exhibited excellent catalytic activity with a high reaction constant of 2.75 min(-1). This was a significant enhancement compared to other Ag catalysts reported in the literature.
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