Size and shape effects of MnFe₂O₄ nanoparticles as catalysts for reductive degradation of dye pollutants

Abstract

• Size and shape-dependent MnFe₂O₄ NPs were prepared via a facile method.

• Ligand-exchange chemistry was used to prepare the hydrophilic MnFe₂O₄ NPs.

• The catalytic properties of MnFe₂O₄ NPs toward dye degradation were fully studied.

• The catalytic activities of MnFe₂O₄ NPs followed Michaelis–Menten behavior.

• All the MnFe₂O₄ NPs exhibit selective degradation to different dyes.

The magnetic nanoparticles that are easy to recycle have tremendous potential as a suitable catalyst for environmental toxic dye pollutant degradation. Rationally engineering shapes and tailoring the size of nanocatalysts are regarded as an effective manner for enhancing performances. Herein, we successfully synthesized three kinds of MnFe₂O₄ NPs with distinctive sizes and shapes as catalysts for reductive degradation of methylene blue, rhodamine 6G, rhodamine B, and methylene orange. It was found that the catalytic activities were dependent on the size and shape of the MnFe₂O₄ NPs and highly related to the surface-to-volume ratio and atom arrangements. Besides, all these nanocatalysts exhibit selectivity to different organic dyes, which is beneficial for their practical application in dye pollutant treatment. Furthermore, the MnFe₂O₄ NPs could be readily recovered by a magnet and reused more than ten times without appreciable loss of activity. The size and shape effects of MnFe₂O₄ nanoparticles demonstrated in this work not only accelerate further understanding the nature of nanocatalysts but also contribute to the precise design of nanoparticles catalyst for pollutant degradation.

Graphical abstract

Keywords

Dye degradation / MnFe ₂O ₄ nanoparticles / Size and shape-control

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