Self-Assembled Magnetic Pt Nanocomposites for the Catalytic Reduction of Nitrophenol

Abstract

Self-assembled nanotechnology has been used widely in various well-defined microstructures fabrication. Herein, this synthetic protocol was successfully utilized to in situ or hierarchically prepare magnetic Pt nanocomposites Fe3O4@Pt via a distinguishing two-step process. The distinction of these two pathways is due to the different synthetic processes. In the case of in situ preparation (Path I), it involves a supramolecular self-assembly of boron clusters with γ-CD on Fe3O4 substrate and then followed by in situ formation of Pt nanoparticles (NPs). But in the case of hierarchical preparation (Path II), the first step is preparing Pt NPs colloids reduced by boron clusters Cs2[closo-B12H12], and subsequent step is immobilizing the as-prepared [closo-B12H12]2–-capped Pt NPs on the Fe3O4@γ-CD. The success of these two fabrication strategies lies in the use of trifunctional boron clusters (reductant, stabilizer, and superchaotropic anchor). Both of the as-prepared Fe3O4@Pt nanocomposites showed good catalytic performance in the selective nitro-group reduction of nitroaromatics. A control test further indicated that the in situ prepared Fe3O4@Pt nanocomposites, with smaller size and higher loading of Pt NPs, exhibited a better catalytic performance and recyclability.

Magnetic Fe3O4-Supported Gold Nanoflowers with Lattice-Selected Surfaces: Preparation and Catalytic Performance

“…In addition, the XRD pattern of Fe 3 O 4 was in good agreement with the reference data (Figure S3). ,, …”

“…In addition, the XRD pattern of Fe 3 O 4 was in good agreement with the reference data (Figure S3). 38,50,59 We prepared Al 5c,d, S4, and S5). The magnetic saturation of AuNFs/Fe 3 O 4 was decreased to ∼33 emu•g −1 (Figure 4), which enabled instantaneous magnetic separation (Figure 3b).…”

Pd/Chitosan Nanoparticle Catalysts Prepared by Solid Mortar Grinding for Hydrogenation of Nitroarenes

“…However, they can be converted into corresponding amine derivatives, which may be used as possible intermediates to access industrially vital compounds through the reduction process . Several transition metals, including Fe, Ni, Co, Ru, Rh, Pt, Pd, Au, and Ag, as well as bimetals, − are employed in the hydrogenation of nitroarenes. Iron-based nanomaterials have been used as catalysts for the reduction of nitroarenes as well as supports for the loading of Pd NPs. , Despite the fact that these catalysts efficiently convert various nitroarenes into amine derivatives, there are still one or more drawbacks to these reaction processes, including the laborious catalyst preparation procedures, the use of toxic organic compounds as additives, harsh reaction conditions, etc.…”

Magnetic Mesoporous Silica Nanorods Loaded with Ceria and Functionalized with Fluorophores for Multimodal Imaging

“…Nanocomposites with unique properties and synergistic actions from different components have a great potential to be used in fields such as biomedicine, 1 , 2 catalysis, 3 , 4 and energy. 5 , 6 Mesoporous silica nanocomposites are mechanically and thermally stable, present large surface areas and pore volumes with narrow pore size distributions, and their particle and pore sizes can be controlled.…”

“…Nanocomposites with unique properties and synergistic actions from different components have a great potential to be used in fields such as biomedicine, , catalysis, , and energy. , Mesoporous silica nanocomposites are mechanically and thermally stable, present large surface areas and pore volumes with narrow pore size distributions, and their particle and pore sizes can be controlled. − These characteristics endorse mesoporous silica as an attractive platform to design nanocomposites by loading the pores with different chemical species. Such materials can encapsulate large amounts of nanoscopic cargo while maintaining their robustness and pore ordering.…”