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Polymers 2018, 10(7), 724; https://doi.org/10.3390/polym10070724

Lignin Nanosphere-Supported Cuprous Oxide as an Efficient Catalyst for Huisgen [3+2] Cycloadditions under Relatively Mild Conditions

1
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China
2
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
3
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Received: 18 April 2018 / Revised: 11 June 2018 / Accepted: 13 June 2018 / Published: 2 July 2018
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Abstract

In this work, low-cost lignin nanospheres were fabricated and further applied as an efficient and sustainable support for preparing cuprous oxide (Cu2O) “green” catalyst by using electrospraying technology. The unalloyed lignin, a special three-dimensional molecular structure, was successfully processed into uniform nanospheres under an electrospraying condition. The synthesized lignin-supported Cu2O catalyst had a well-defined nanosphere structure, and Cu2O nanoparticles with sizes less than 30 nm were supported by exposed layers of lignin nanospheres. There were C–O–Cu bonds formed between the lignin nanospheres and the metallic nanoparticles. The lignin nanospheres and the lignin nanosphere-supported catalyst werfe characterized by utilizing XRD, SEM, TEM, XPS, EDS, and TGA. The immobilization of Cu2O nanoparticles on the lignin nanospheres was beneficial for dispersion of the Cu2O nanoparticles and preventing their aggregation, which could cause catalyst deactivation, which favored the Huisgen [3+2] cycloaddition reaction. The triazole synthesis results indicated that the lignin nanosphere-supported Cu2O catalyst had a high catalytic performance with 99% yield under solvent-free conditions. Furthermore, the as-synthesized catalyst could be recycled for four times without significantly losing its catalytic activity. View Full-Text
Keywords: electrospraying technology; lignin; nanospheres; solvent-free reaction electrospraying technology; lignin; nanospheres; solvent-free reaction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhou, Z.; Peng, X.; Zhong, L.; Li, X.; Sun, R. Lignin Nanosphere-Supported Cuprous Oxide as an Efficient Catalyst for Huisgen [3+2] Cycloadditions under Relatively Mild Conditions. Polymers 2018, 10, 724.

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