A magnetic CoFe₂O₄–CNS nanocomposite as an efficient, recyclable catalyst for peroxymonosulfate activation and pollutant degradation

Abstract

Sulfate radical (SO 4 c À ) based advanced oxidation processes allow efficient degradation of refractory organics, but efficient, low-cost, and robust catalysts for such processes are still lacking. In this work, a magnetically recoverable heterogeneous catalyst was fabricated by immobilizing spinel cobalt-ferrite (CoFe 2 O 4 ) particles on graphitic carbon nitride nanosheets (CNS) using a low-cost, one-step solvothermal method. In the CoFe 2 O 4 -CNS nanocomposite, the CoFe 2 O 4 particles were evenlydistributed on the CNS surface, giving the nanocomposite a high specific surface area and significantly raised activity for peroxymonosulfate (PMS) activation and sulfonamide degradation compared to the bare CoFe 2 O 4 NPs, which were considerably aggregated. In addition, the CoFe 2 O 4 -CNS could be more efficiently separated under magnetic field and resuspended compared with the bare CoFe 2 O 4 due its larger sizes and no agglomeration. A stable activity of the nanocomposite catalyst during repeated use was also demonstrated. Our results imply high potential of CoFe 2 O 4 -CNS for sustainable water treatment and environmental remediation applications.

Cobalt sulfide nanofilm-assembled cube as an efficient catalyst for activating monopersulfate to degrade UV filter, 4,4′-dihydroxybenzophenone, in water

“…These comparisons also suggested that the degradation extent of 4HBP was greatly correlated to MPS dosages as sulfate radicals are generated from MPS instead of catalysts. On the contrary, CSNF served as a catalyst which would manipulate degradation kinetics [56,57].…”

Synthesis of Spinel Ferrite MFe2O4 (M = Co, Cu, Mn, and Zn) for Persulfate Activation to Remove Aqueous Organics: Effects of M-Site Metal and Synthetic Method

“…This tended to reduce the contact area between the catalyst and other reactants, which was not conducive to pollutant removal (Xue et al, 2007). CuFe 2 O 4 -ST had a typical morphology of a solvothermal catalyst (Ueda Yamaguchi et al, 2016;Chen et al, 2017) with high dispersion, relatively uniform spherical-like shape, and minimum particle size, which could increase the external surface area. CuFe 2 O 4 -SG particles were found to be of moderate size and irregular shape.…”

Single‐Phase Precursors for the Preparation of Spinel Ferrites via Oxalate Route: the Study of Cobalt Ferrite Synthesis

“…[20] However, due to the high temperatures (> 900 °C) employed to overcome the diffusion barrier, it allows for little control over the preparation process and the homogeneity of the product. [20] Disadvantages of the solid-state synthesis are addressed by other methods, within so called "wet chemistry", such as solgel, [21,22] solvothermal [23] and hydrothermal synthesis, [24][25][26] reverse micelle synthesis, [27] polyol-assisted synthesis, [28] coprecipitation, [29][30][31] or the thermal decomposition of a suitable precursor. [18,[32][33][34] Among the listed methods the thermal decomposition presents an interesting option, as it offers the relative simplicity of the solid-state approach as well as the option to control the process due to relatively low temperatures that are involved.…”