Dendritic Amphiphile Mediated One-Pot Preparation of 3D Pt Nanoparticles-Decorated PolyHIPE as a Durable and Well-Recyclable Catalyst.
Straightforward organization of platinum nanoparticles (PtNPs) onto a macroscopic and robust material is described. PtNPs are in situ produced and stabilized by a dendritic amphiphile, where the latter consists of a hyperbranched polyethylenimine (PEI) as core and poly(styrene-co-2-ethylhexyl acrylate (P(St-EHA)) as shell. The resulting Pt@PEI@P(St-EHA), upon mixing with biphasic water and oil (a mixture of EHA and a dimethacrylate cross-linker in toluene), can self-assemble along the water/oil (W/O) interface and result in a stable emulsion. At W/O = 80/20 (volume ratio), a high internal phase emulsion (HIPE) forms and can be radically transformed into an open-cellular and elastic monolith termed Pt-polyHIPE, with PtNPs decorated on the surface. The Pt-polyHIPE is mechanically robust, and the cross-linking homogeneity by the dimethacrylate is responsible for the strength. The Pt-polyHIPE shows an active catalytic property, as evaluated by reduction of 4-nitrophenol. The material is conveniently and well recyclable, showing no decrease in catalytic activity at least within 20 cycles. Energy-dispersive X-ray spectra and thermogravimetric analysis also support sufficient retaining of the Pt species, where the multivalent and multiligand PEI should be responsible for this property.
Institute of Functional Polymers, School of Materials Science and Engineering, Tongji University , Shanghai 201804, China.
Honghai
H
Liu
Institute of Functional Polymers, School of Materials Science and Engineering, Tongji University , Shanghai 201804, China.
Decheng
D
Wan
Institute of Functional Polymers, School of Materials Science and Engineering, Tongji University , Shanghai 201804, China.
Jiang
J
Du
Institute of Functional Polymers, School of Materials Science and Engineering, Tongji University , Shanghai 201804, China.
Ming
M
Jin
dendritic amphiphile; platinum; polyHIPE; recycle; self-assembly; supported catalyst