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. 2021 Mar 26;6(13):9095-9103.
doi: 10.1021/acsomega.1c00204. eCollection 2021 Apr 6.

Novel Magnetic Fe3O4/α-FeOOH Nanocomposites and Their Enhanced Mechanism for Tetracycline Hydrochloride Removal in the Visible Photo-Fenton Process

Xinyi Huang  1 , Hui Zhou  1 , Xiaojun Yue  1 , Songlin Ran  1 , Jianhua Zhu  1   2
Affiliations

Novel Magnetic Fe3O4/α-FeOOH Nanocomposites and Their Enhanced Mechanism for Tetracycline Hydrochloride Removal in the Visible Photo-Fenton Process

Xinyi Huang et al. ACS Omega. .

Abstract

Magnetic Fe3O4/α-FeOOH heterojunction nanocomposites (denoted as Fe-NCs) have been synthesized by a fast one-pot hydrothermal method. The obtained Fe-NCs contain rich micropores with a high surface area of 135.15 m2/g. The different phases in the composites can efficiently enhance the visible-light absorption, improving the separation and transfer of photogenerated electron-hole pairs during the photocatalytic reaction. Thus, they show excellent degradation and mineralization of tetracycline (TC) over a wide pH range (5-9) in the visible photo-Fenton reaction. Especially, the catalyst exhibits the highest adsorption capacity toward TC at a neutral pH, which facilitates the surface reactions of TC with active species. Experiments evidence that the high production of photogenerated holes and superoxide radicals (O2 •-) in Fe-NCs are favorable to the high catalytic efficiency. Combined with liquid chromatography-mass spectrometry, the possible pathway toward TC degradation was proposed.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Characterization of prepared Fe-NCs-1. (a) TEM image; (b) corresponding HRTEM images; (c) XRD patterns of different samples; and (d) M–S curve (insets are the corresponding magnetic properties in the presence of an external magnetic field).
Figure 2
Figure 2
Physical and chemical properties of Fe-NCs-1. (a) UV–vis DRS spectra; (b) N2 adsorption–desorption isotherms curves. The inset is the corresponding pore diameter distribution; (c) EIS Nyquist plots; and (d) photocurrent spectra.
Figure 3
Figure 3
(a) Photocatalytic degradation of TC in different systems and (b) corresponding first-order plots (catalyst loading = 0.5 g·L–1; [H2O2] = 10 mM; [TC] = 10 mg·L–1; pH = 5; and T = 25 °C).
Figure 4
Figure 4
Effects of (a) catalyst dosage, (b) H2O2 dosage, and (c) initial pH on the catalytic degradation process. (d) TC degradation, TOC removal, and leaching ions in multi-cycle batch experiments.
Figure 5
Figure 5
XPS spectra of Fe-NCs-1. (a) Fe 2p before catalysis and (b) after catalysis.
Figure 6
Figure 6
EPR spectra for DMPO adducts in Fe-NCs-1/visible photo-Fenton systems. (a) DMPO–•OH; (b) DMPO–O2•–; and (c) radical scavenger quenching test for TC degradation in the visible photo-Fenton reaction.
Figure 7
Figure 7
Possible catalytic mechanisms for visible photo-Fenton degradation of TC by Fe-NCs-1.
Figure 8
Figure 8
Possible degradation pathway of TC toward the Fe-NCs-1 under the visible photo-Fenton process.
See this image and copyright information in PMC

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