A facile template method to fabricate one-dimensional Fe3O4@SiO2@C/Ni microtubes with efficient catalytic and adsorption performance?

CrystEngComm Pub Date: 2021-09-21 DOI: 10.1039/D1CE01104A

Abstract

Herein, we report a facile approach for preparing Fe3O4@SiO2@C/Ni microtubes, which could be used as both a catalyst and adsorbent. During the synthetic process, two coating layers (SiO2 and PDA-Ni2+ layers) are polymerized on the surface of MoO3@FeOOH in turn with an extended St?ber method using MoO3 microrods as sacrificing templates. Notably, the coating of inorganic SiO2 and organic PDA-Ni2+ layers and the removal of MoO3 cores are easily achieved simultaneously in ammonia solution with a one-step reaction. Interestingly, the coated silica not only protects the Fe3O4 nanoparticles, but also suppresses the reverse electron transfer from PDA to Fe3O4 in a calcination process, which leads to the in situ reduction of Ni2+ that enhances the dispersibility and density of the Ni nanoparticles. The resulting Fe3O4@SiO2@C/Ni hybrid microtubes can be used as a catalyst towards the reduction of 4-nitrophenol (4-NP) in the presence of NaBH4. Meanwhile, they also exhibit highly selective adsorption on His-rich proteins (BHb). Moreover, the hybrid microtubes can be conveniently separated with an extra magnetic field due to the presence of Ni and Fe3O4, and they show good cyclic stability, which is important for practical applications.

Graphical abstract: A facile template method to fabricate one-dimensional Fe3O4@SiO2@C/Ni microtubes with efficient catalytic and adsorption performance
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