AI Article Synopsis

  • Porous monolithic microreactors using renewable carbonized wood and decorated with Ni/Au nanoparticles show potential for efficient catalytic applications, particularly in reducing 4-nitrophenol.
  • The unique structure enhances both mass diffusion and electron transfer, achieving a very high reduction efficiency of 99.5%.
  • The reaction mechanism involves an attraction-repulsion effect from the different electronegativities of Ni and Au, indicating the membrane's promising applications in various catalytic processes.

Article Abstract

Porous monolithic microreactors show great promise in catalytic applications, but are usually based on non-renewable materials. Herein, we demonstrate a Ni/Au nanoparticle-decorated carbonized wood (Ni/Au-CW) monolithic membrane microreactor for the efficient reduction of 4-nitrophenol. The hierarchical porous wood structure supports uniformly distributed heterobimetallic Ni/Au nanoparticles. As a consequence of these two factors, both mass diffusion and electron transfer are enhanced, resulting in a superior reduction efficiency of 99.5% as the liquor flows through the optimised Ni/Au-CW membrane. The reaction mechanism was investigated by electron paramagnetic resonance spectroscopy and density functional theory calculations. The proposed attraction-repulsion mechanism facilitated by the bimetallic nanoparticles has been ascribed to the different electronegativities of Ni and Au. The Ni/Au-CW membrane exhibits excellent catalytic performance and could be applicable to other catalytic transformations.

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Source
http://dx.doi.org/10.1016/j.jhazmat.2022.130270DOI Listing

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