1. PS-b-PAA/Cu two-dimensional nanoflowers fabricated at the liquid/liquid interface: A highly active and robust heterogeneous catalyst.
- Author
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Man, Yuecuo, Li, Shuman, Diao, Qi, Lee, Yong-Ill, and Liu, Hong-Guo
- Subjects
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CATALYTIC activity , *CATALYTIC hydrogenation , *COMPOSITE structures , *CATALYTIC reduction , *HETEROGENEOUS catalysts , *LIQUID-liquid interfaces - Abstract
PS-b-PAA/copper composite two-dimensional nanoflowers with highly heterogeneous catalytic activity and good stability was fabricated at the liquid/liquid interface. To design and prepare heterogeneous catalysts with both high catalytic activity and good stability is still a challenge. Herein, we fabricated a composite Cu/PS-b-PAA film consisting of unique nanoflowers for the heterogeneous catalytic reactions such as hydrogenation of nitroarenes in aqueous solutions at the planar liquid/liquid interface through the interfacial adsorption and self-assembly process. The nanoflowers are comprised of nanoplates with a thickness of about 10 nm. The nanoplates have layered structure composed of an inner layer of hydrophobic PS and two surface layers of hydrophilic PAA where the copper species are dispersed. The composite film exhibited high catalytic activity for the reduction of p -nitroaniline (p -NA) in aqueous solutions and the rate constant reached to 396.45 s−1 g−1. Inaddition, the composite film also showed good stability and high recyclability without any changes in the rate constant and conversion efficiency in 15 successive cycles. These should be attributed to the special structure of the composite nanoflowers. We developed an excellent heterogeneous catalyst system possessed of both high activity and good stability through delicate design and fabrication. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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