High-efficient reduction of methylene blue and 4-nitrophenol by silver nanoparticles embedded in magnetic graphene oxide
- Authors
- Doan, V.-D.; Nguyen, N.-V.; Nguyen, T.L.-H.; Tran, V.A.; Le, V.T.
- Issue Date
- Jun-2023
- Publisher
- SPRINGER HEIDELBERG
- Keywords
- 4-Nitrophenol; Graphene oxide; Magnetic nanocatalyst; Methylene blue; Reduction; Silver nanoparticles
- Citation
- Environmental Science and Pollution Research, v.30, no.28, pp.71543 - 71553
- Journal Title
- Environmental Science and Pollution Research
- Volume
- 30
- Number
- 28
- Start Page
- 71543
- End Page
- 71553
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88412
- DOI
- 10.1007/s11356-021-13597-z
- ISSN
- 0944-1344
- 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. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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