Abstract
Iron-based catalysts are environmentally friendly, and iron minerals are abundant in the earth's crust, with great potential advantages for PMS-based advanced oxidation process applications. However, homogeneous Fe2+/PMS systems suffer from side reactions and are challenging to reuse. Therefore, develo** catalysts with improved stability and activity is a long-term goal for practical Fe-based catalyst applications. In this study, we prepared Fe-HNTs nanoreactors by encapsulating a nitrogen-doped carbon layer with one-dimensional halloysite nanotubes (HNTs) using the molten salt-assisted method. Subsequently, Fe (Co, Ni) nanoclusters were anchored onto the nitrogen-doped carbon layer at a relatively low temperature (550℃), resulting in stable and uniform distribution of metal nanoclusters on the surface of HNTs carriers in the form of Fe-Nx coordination. The results showed that the dissolution of the molten salt and leaching of post-treated metal oxides generated numerous mesopores within the Fe-HNTs nanoreactor, leading to a specific surface area more than 10 times that of HNTs. This enhanced mass transfer capability facilitates rapid pollutant removal while exposing more active sites. Remarkably, Fe-HNTs adsorbed up to 97% of tetracycline within 60 min. In the Fe-HNTs/PMS system, the predominant reactive oxygen species has been shown to be 1O2, and the added tetracycline was degraded by more than 98% within 5 min. The removal of tetracycline was maintained above 96% in the presence of interfering factors such as wide pH (3–11) and inorganic anions (5 mM Cl−, HCO3−, NO3−, and SO42−). The investigated mechanism suggests that efficient degradation and interference resistance of the Fe-HNTs/PMS system is attributed to the synergistic effect between the rapid adsorption of porous structure and the non-radical (1O2)-dominated degradation pathway.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- M–N-C:
-
Metal-nitrogen-carbon
- HNTs:
-
Halloysite nanotubes
- Fe-HNTs:
-
Fe/N/C@HNTs
- Co-HNTs:
-
Co/N/C@HNTs
- Ni-HNTs:
-
Ni/N/C@HNTs
- TC:
-
Tetracycline
- NFA:
-
Norfloxacin
- RhB:
-
Rhodamine
- MB:
-
Methylene blue
- AOPs:
-
Advanced oxidation processes
- PMS:
-
Peroxymonosulfate
- TBA:
-
Tert-butanol
- SEM:
-
Scanning electron microscopy
- XRD:
-
X-ray diffraction
- TEM:
-
Transmission electron microscope
- EDS :
-
Energy dispersive spectroscopy
- XPS:
-
X-ray photoelectron spectroscopy
- BET:
-
Brunauer–Emmett–Teller
- FTIR :
-
Fourier transform infrared spectrometer
- EPR:
-
Electron paramagnetic resonance
- LC-MS:
-
Liquid chromatography-mass spectrometry
- ROS:
-
Reactive oxygen species
- COD :
-
Chemical oxygen demand
- FFA:
-
Furfuryl alcohol
- MeOH:
-
Methanol
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Funding
The authors acknowledge the financial support provided by the Engineering Research Center of Non-metallic Minerals of Zhejiang Province (ZD2023K04), China Postdoctoral Science Foundation (2022M723394), and Zhejiang Provincial Natural Science Foundation of China (LY24E040002).
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Qing Sun: conceptualization, methodology, data curation, and funding acquisition. Jiale Yu: methodology, writing, and visualization. Youpu Zhao: formal analysis, data curation, visualization, and writing. Hanhu Liu: review and editing and investigation. Chunsheng Li: supervision and resources. Jiajun Tao: visualization and data curation. Jian Zhang: supervision and investigation. Jiawei Sheng: project administration and funding acquisition.
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Sun, Q., Yu, J., Zhao, Y. et al. Subnano-Fe (Co, Ni) clusters anchored on halloysite nanotubes: an efficient Fenton-like catalyst for the degradation of tetracycline. Environ Sci Pollut Res 31, 28210–28224 (2024). https://doi.org/10.1007/s11356-024-32947-1
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DOI: https://doi.org/10.1007/s11356-024-32947-1