CDs/CeVO<sub>4</sub> nanohybrids synergistic visible light for activation of peroxymonosulfate toward tetracycline degradation

LI Shijia; PANG Ernan

Volume 41 Issue 10

Oct. 2024

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LI Shijia, PANG Ernan. CDs/CeVO4 nanohybrids synergistic visible light for activation of peroxymonosulfate toward tetracycline degradation[J]. Acta Materiae Compositae Sinica, 2024, 41(10): 5326-5335.

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LI Shijia, PANG Ernan. CDs/CeVO₄ nanohybrids synergistic visible light for activation of peroxymonosulfate toward tetracycline degradation[J]. Acta Materiae Compositae Sinica, 2024, 41(10): 5326-5335.

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CDs/CeVO₄ nanohybrids synergistic visible light for activation of peroxymonosulfate toward tetracycline degradation

LI Shijia^{1
,
,},
PANG Ernan²

1.
Institute of Traffic Engineering, Shanxi Vocational University of Engineering Science and Technology, Taiyuan 030000, China
2.
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China

Funds: Science and Technology Innovation Fund of Shanxi Vocational University of Engineering Science and Technology (NO.202229)

Received Date: 2024-04-29
Accepted Date: 2024-06-08
Rev Recd Date: 2024-05-27

Available Online: 2024-06-25

Publish Date: 2024-10-15

Abstract

Abstract

The limited absorption of visible light and high recombination rate of photogenerated electron-hole pairs impede the practical application of CeVO₄ in photocatalysis. The unique π-conjugated structure of carbon dots(CDs) endows them with exceptional capabilities for the storing and transferring photogenerated electrons. Herein, CDs/CeVO₄ was successfully synthesized by two-step method of hydrothermal and co-precipitation, resulting in a significant enhancement of photogenerated carrier transfer and separation efficiency with the incorporation of CDs. Under visible light irradiation, CDs/CeVO₄ exhibit enhanced activity towards PMS for the degradation of tetracycline hydrochloride(TC), resulting in a 90 % degradation rate of TC after 60 minutes of reaction. The reaction rate constant is 4.1 times higher than that of CeVO₄. XPS, UV-Vis DRS, and time-resolved fluorescence spectra demonstrate that CDs/CeVO₄ exhibits a narrower band gap, an enhanced capacity for absorbing visible light, and a 15.1-fold increase in the fluorescence lifetime compared to CeVO₄. The results of EPR and XPS tests confirm the presence of abundant oxygen vacancies in CDs/CeVO₄, thereby further enhancing their capacity for activating PMS. Capture experiments of active substances show that h⁺、SO₄^·−和·OH are the active species in the reaction system, and a plausible degradation mechanism was proposed. After five cycles of experiments, the degradation rate decrease slightly, showing good photocatalytic performance. This work provide a new strategy for the degradation of organic pollutants in wastewater.
- Carbon dots,
- peroxymonosulfate (PMS),
- photocatalysis,
- advanced oxidation processes,
- tetracycline
Long Abstrsct
Innovation Points

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References(34)

References

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