Abstract
Transition metal-based (M = Fe, Cu, etc.) catalytic systems are generally popular in advanced oxidation processes; however, the difficulty in restoring their active oxidation state, i.e., Mn +1 → Mn+, limits their performance during the degradation of organic pollutants. Here, a novel strategy of constructing an electron-rich center via systematic intercalation of ultrathin-reduced graphene oxide (rGO) sheets into hydroxide-based materials was introduced to accelerate M(n +1)/Mn+ redox cycles of transition metal-based (M = Fe, Cu) heterogeneous catalysts (M-Hydroxide/rGO). According to the first-order kinetic model, the fabricated M-Hydroxide/rGO was more reactive than the corresponding hydroxides or rGO during peroxymonosulfate (PMS) activation. The first-order observed degradation rates (kobs) of 4-chlorophenol (4-CP) were found in the order of Fe-Hydroxide/rGO (kobs = 0.152 min−1) > Cu-Hydroxide/rGO (kobs = 0.091 min−1) > Zn-Hydroxide/rGO (kobs = 0.021 min−1). Moreover, the prepared best Fe-Hydroxide/rGO catalyst exhibited 6–43-fold high pollutant removal reactivity than catalyst precursors (Fe-Hydroxide/NO3 and rGO), conventional benchmark catalysts (CuO, Co3O4, CuOFe3O4, and Fe3O4), and various Fe3+-based co-catalytic systems (such as Fe3+/WS2 and Fe3+/MoS2). The better efficiency was ascribed to the electron-rich domain (C = O, O–C = O) of interlayered rGO, allowing the constant regeneration of Fe2+ via efficient electron transfer and the production of diverse reactive species, i.e., sulfate radicals (•SO4−), hydroxyl (•OH) radicals, and singlet oxygen (1O2). Moreover, a suitable degradation pathway of 4-CP, passing through diverse reactive species, was proposed. This study highlights the vital role of rGO in improving the activity and stability of Fe-based hydroxide catalysts by accelerating Fe3+/Fe2+ redox cycle through regular feeding of electrons.
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Acknowledgements
The authors acknowledge the analysis and testing center of Huazhong University of Science and Technology, Wuhan, China, and the support of the Fundamental Research Funds for Central Universities, the Open Research Fund of the State Key Laboratory of Polymer Physics and Chemistry, and the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University, Saudi Arabia, for funding this work through the Large Groups Project under grant number RGP2/447/44. The authors also acknowledge the support of the Unit of Bee Research and Honey Production at King Khalid University, Abha, Saudi Arabia.
Funding
This work was supported by the BRICS STI Framework Programme 3rd call 2019 (2018YFE0123700), the National Natural Science Foundation of China (21774039, 51973076), and the Deanship of Scientific Research at King Khalid University Saudi Arabia through the Large Group Project (RGP2/447/44).
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Ajmal Shahzad, Jawad Ali, and Muhammad Wajid Ullah. The first draft of the manuscript was written by Ajmal Shahzad, and all authors commented on previous versions of the manuscript. Muhammad Asif Javed, Fida Hussain, Sehrish Manan, Khalid Ali Khan, Thamer Alomayri, and Weam Abdul Raheem M contributed to the data curation and preparation of figures. Guang Yang and Khalid Ali Khan acquired funding. Muhammad Wajid Ullah and Guang Yang edited and proofread the manuscript. All authors read and approved the final version of the manuscript.
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Shahzad, A., Ali, J., Ullah, M.W. et al. Fe-based dual-center heterogeneous catalyst assisted with reduced graphene oxide for the activation of peroxymonosulfate. Adv Compos Hybrid Mater 6, 185 (2023). https://doi.org/10.1007/s42114-023-00757-7
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DOI: https://doi.org/10.1007/s42114-023-00757-7