Abstract
In this study, a ternary magnetically separable nanocomposite of silver nanoparticles (AgNPs) embedded in magnetic graphene oxide (Ag/Fe3O4@GO) was designed and synthesized. Beta-cyclodextrin was used as a green reducing and capping agent for decorating of AgNPs on Fe3O4@GO. The fabricated material was characterized using X-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy, vibrating sample magnetometry, and energy-dispersive X-ray spectroscopy. The catalytic properties of the prepared Ag/Fe3O4@GO for the reduction of 4-nitrophenol (4-NP) and methylene blue (MB) dye with sodium borohydride were investigated in detail. The morphological and structural studies revealed that Fe3O4 and AgNPs with a mean size of 12 nm were uniformly distributed on the GO sheet at high densities. The catalytic tests showed that Ag/Fe3O4@GO exhibited an ultrafast catalytic reduction of 4-NP and MB with a reduction rate constant of 0.304 min−1 and 0.448 min−1, respectively. Moreover, the catalyst demonstrated excellent stability and reusability, as evidenced by the more than 97% removal efficiency maintained after five reuse cycles. The Ag/Fe3O4@GO catalyst could be easily recovered by the magnetic separation due to the superparamagnetic nature of Fe3O4 with high saturated magnetization (45.7 emu/g). Besides, the formation of networking between the formed AgNPs and β-CD through hydrogen bonding prevented the agglomeration of AgNPs, ensuring their high catalytic ability. The leaching study showed that the dissolution of Fe and Ag from Ag/Fe3O4@GO was negligible, indicating the environmental friendliness of the synthesized catalyst. Finally, the high catalytic performance, excellent stability, and recoverability of Ag/Fe3O4@GO make it a potential candidate for the reduction of organic pollutants in wastewater.
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All data generated or analyzed during this study are included in this published article.
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This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 104.05-2019.03.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Van Dat Doan, Ngoc Vy Nguyen, and Thi Lan Huong Nguyen. The first draft of the manuscript was written by Van Thuan Le, and all authors commented on previous versions of the manuscript. Writing—review and editing was performed by Vy Anh Tran. All authors read and approved the final manuscript.
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Doan, VD., Nguyen, NV., Nguyen, T.LH. et al. High-efficient reduction of methylene blue and 4-nitrophenol by silver nanoparticles embedded in magnetic graphene oxide. Environ Sci Pollut Res 30, 71543–71553 (2023). https://doi.org/10.1007/s11356-021-13597-z
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DOI: https://doi.org/10.1007/s11356-021-13597-z