[Preparation of Prussian Blue@Yeast Catalyst and Its Heterogeneous Fenton Performance]

A novel heterogeneous Fenton catalyst, Prussian blue@yeast (PB@yeast), was prepared via facile self-assembly synthesis. The as-synthesized composite was characterized by field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), powder X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). All of the results indicated that PB nanoparticles were uniformly dispersed on the surface of yeasts with stable core-shell morphology. Degradation of the model anionic fluorescent whitening agent CXT indicated that the PB@yeast catalyst presented a synergistic effect of adsorption and heterogeneous Fenton performance. Owing to the high adsorption capacity of yeast, the CXT molecules were easy to move to the active site of the catalyst, promoting the electron transfer between Fe(Ⅲ) and Fe(Ⅱ) and then enhancing the catalytic activity of the Fenton reaction effectively. Furthermore, the yeast support could improve the dispersity and stability of PB nanoparticles, which maintained excellent catalytic activity and stability after being recycled four times.