Abstract
A reduced graphene oxide (RGO) supported Fe3O4-MnO2 nanocomposite (Fe3O4-MnO2@RGO) was successfully prepared for catalytic degradation of oxytetracycline (20 mg/L) by potassium persulfate (PS) and adsorption removal of mixture of Pb2+, Cu2+, and Cd2+ ions (each 0.2 mM) in the synchronous scenario. The removal efficiencies of oxytetracycline, Pb2+, Cu2+, and Cd2+ ions were observed as high as 100%, 99.9%, 99.8%, and 99.8%, respectively, under the conditions of [PS]0 = 4 mM, pH0 = 7.0, Fe3O4-MnO2@RGO dosage = 0.8 g/L, reaction time = 90 min. The ternary composite exhibited higher oxytetracycline degradation/mineralization efficiency, greater metal adsorption capacity (Cd2+ 104.1 mg/g, Pb2+ 206.8 mg/g, Cu2+ 70.2 mg/g), and better PS utilization (62.6%) than its unary and binary counterparts including RGO, Fe3O4, Fe3O4@RGO, and Fe3O4-MnO2. More importantly, the ternary composite had good magnetic recoverability and excellent reusability. Notably, Fe, Mn, and RGO could play a synergistic role in the improvement of pollutant removal. Quenching results indicate that surface bounded SO4•– was the major contributor to oxytetracycline decomposition, and the -OH groups on the composite surface shouldered a significant role in PS activation. The results indicate that the magnetic Fe3O4-MnO2@RGO nanocomposite has a good potential for removing organic-metal co-contaminants in waterbody.
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Data availability
The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- SR-AOPs:
-
Sulfate radical (SO4•–)-based advanced oxidation processes
- GO:
-
Graphene oxide
- RGO:
-
Reduced graphene oxide
- OTC:
-
Oxytetracycline
- XRD:
-
X-ray diffraction
- SEM:
-
Scanning electron microscopy
- TEM:
-
Transmission electron microscopy
- EDS:
-
Energy-dispersive spectroscopy
- FT-IR:
-
Fourier transform infrared spectroscopy
- BET:
-
Brunauer–Emmett–Teller
- DTA:
-
Differential thermal analysis
- TG:
-
Thermogravimetry
- PS:
-
Potassium persulfate
- TBA:
-
Tert-butyl alcohol
- ICP-OES:
-
Inductively coupled plasma optical emission spectrometer
- TOC:
-
Total organic carbon
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Funding
This study was funded by the Science & Technology Plan Projects of Education Department of Jiangxi Province (no. GJJ212619).
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Mang Lu: corresponding author, paper writing, experimental design. Xue-jiao Wu: data analysis. Chu-xing Wan: Fe3O4-MnO2@RGO preparation and experimental experiments. Qiu-ping Gong: Fe3O4-MnO2 preparation and experimental experiments. Jia-xin Li: Fe3O4-MnO2@RGO preparation and experimental experiments. Shuang-shuang Liao: Fe3O4-MnO2 preparation and experimental experiments. Yu-an Wang: Fe3O4@RGO preparation and experiments. Shu-hao Yuan: Fe3O4@RGO preparation and experiments.
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Highlights
• The synthesized Fe3O4-MnO2@RGO nanocomposite is a novel catalyst/adsorbent.
• High removal of oxytetracycline and metal ions was obtained.
• The nanocomposite has excellent catalysis and adsorption ability.
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Lu, M., Wu, Xj., Wan, Cx. et al. Evaluation of Fe3O4-MnO2@RGO magnetic nanocomposite as an effective persulfate activator and metal adsorbent in aqueous solution. Environ Sci Pollut Res 30, 51125–51142 (2023). https://doi.org/10.1007/s11356-023-25911-y
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DOI: https://doi.org/10.1007/s11356-023-25911-y