☆ 4.7 Article

Enhanced degradation of tetracycline under natural sunlight through the synergistic effect of Ag3PO4/MIL-101(Fe) photocatalysis and Fenton catalysis: Mechanism, pathway, and toxicity assessment

JOURNAL OF HAZARDOUS MATERIALS (2023)

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JOURNAL OF HAZARDOUS MATERIALS

Volume 449, Issue -, Pages -

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ELSEVIER

DOI: 10.1016/j.jhazmat.2023.131024

Keywords

MIL-101(Fe); Photo-Fenton catalysis; Peroxydisulfate; Tetracycline

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Abstract

In this study, Ag3PO4 was encapsulated into MIL-101(Fe) to construct a Ag3PO4/MIL-101(Fe) heterojunction composite, which effectively reduced the adverse effects of tetracycline (TC) through advanced oxidation processes. The reaction was driven by natural sunlight and did not require artificial energy sources. The composite achieved optimal TC degradation rates through photocatalysis and photo-Fenton catalysis, with the highest degradation rate achieved at a mass ratio of 5:1 for MIL-101(Fe) to Ag3PO4 in the composite. The internal conversion of matrix during the processes improved the reusability of the composite and both radical and non-radical species were found to participate in TC degradation. The degradation products and catalytic mechanism of Ag3PO4 and Ag3PO4/MIL-101(Fe) systems were also explored.

Here, we show that the adverse environmental and health effects of tetracycline (TC) can be efficiently reduced by encapsulating Ag3PO4 into MIL-101(Fe) to construct a Ag3PO4/MIL-101(Fe) heterojunction composite through advanced oxidation processes, such as Fenton catalysis, photocatalysis, and photo-Fenton catalysis. Notably, the reaction can be driven by natural sunlight and does not require any artificial energy source. Remarkably, the optimal degradation of TC can be achieved under different compositions of the composite system through photocatalysis and photo-Fenton catalysis. For photo-Fenton catalysis, the maximum degradation rate of TC (2.5730 min-1) is achieved when the mass ratio of MIL-101(Fe) to Ag3PO4 in the composite is 5:1, which is 31.65- and 3.12-fold of that in the Ag3PO4 + PDS + Sunlight and MIL-101(Fe) + PDS+ Sunlight catalyst systems, respectively. Moreover, the internal conversion of matrix during photocatalysis and Fenton catalysis processes inhibits the photocorrosion of Ag3PO4 and improves the reusability of the composite. Furthermore, it is found that both radical and non-radical species participate in the TC degradation. Besides, the degradation products and catalytic mechanism of Ag3PO4 and Ag3PO4/MIL-101(Fe) systems are explored. The toxicity

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Heterogeneous photo-Fenton catalyst α-Fe2O3@g-C3N4@NH2-MIL-101(Fe) with dual Z-Scheme heterojunction for degradation of tetracycline

Chunyan Hu, Jinke He, Jianjun Liang, Tao Lin, Qiuliang Liu

Summary: A novel photo-Fenton catalyst FGN with dual Z-scheme heterojunction was successfully prepared and it showed excellent degradation performance towards tetracycline. The optimized preparation conditions and characterization analyses confirmed the successful synthesis of FGN. The experimental results demonstrated that FGN had better light absorption ability, higher separation efficiency of photoelectrons and holes, larger specific surface area, and higher pore capacity compared to other catalysts. The effects of experimental conditions on the degradation performance were investigated and three degradation pathways of tetracycline were proposed. The structural stability and catalytic active sites of FGN were explored by comparing the XRD and XPS spectra. Additionally, the mechanism of the dual Z-scheme heterojunction was proved through various experimental methods.

ENVIRONMENTAL RESEARCH (2023)