Fabrication of Ag nanoparticles supported on amino-functionalized peeled-watermelon structured silica-coated nano-Fe3O4 with enhanced catalytic activity for reduction of 4-nitrophenol

Chün, Wang; Yang, Lei; Yuan, Xiaofang; Zhou, Wending; Xu, Meisong; Yang, Wanliang

doi:10.1016/j.colcom.2021.100521

Cited by 13 publications

(11 citation statements)

References 56 publications

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“…The stretching vibration of OH groups was attributed to the peak with the most characteristic shape at 3415 cm –1 that it might be related to the hydroxyl groups and absorbed water in SiO 2 . Compared to SiO 2 @Fe 3 O 4 , the peaks of the metal bands in the Ag@SiO 2 @Fe 3 O 4 spectrum shifted from 461 to 468 and 571 to 622 cm –1 , respectively, indicating that silver NPs were deposited on the SiO 2 @Fe 3 O 4 NPs . The FTIR spectra indicated a considerable change in the absorption peaks at 1021, 1443, 1634, and 3428 cm –1 , indicating that the functional groups interacted with the Ag NPs’ surface.…”

Section: Resultsmentioning

confidence: 96%

“…49 Compared to SiO 2 @Fe 3 O 4 , the peaks of the metal bands in the Ag@SiO 2 @Fe 3 O 4 spectrum shifted from 461 to 468 and 571 to 622 cm −1 , respectively, indicating that silver NPs were deposited on the SiO 2 @Fe 3 O 4 NPs. 45 The FTIR spectra indicated a considerable change in the absorption peaks at 1021, 1443, 1634, and 3428 cm −1 , indicating that the functional groups interacted with the Ag NPs' surface. The other small absorption peaks located at 616, 1077, 1355, 1629, 2923, and 3351 cm −1 correspond to several functional groups like CO, CH (stretch), C�C, CH (bending), and OH of lemon extract, respectively.…”

Section: Resultsmentioning

confidence: 98%

“…The saturation magnetization ( Ms ) values of the bare Fe 3 O 4 , SiO 2 @Fe 3 O 4 , and Ag@SiO 2 @Fe 3 O 4 NPs were found to be 78.5, 56.4, and 43.8 emu/g, respectively (Figure ). Due to the ultrafine magnetite nanocrystal composition, they displayed superparamagnetic properties and had low remanence and coercivity . The immobilization of amorphous silica and adhesion of Ag NPs caused the magnetic saturation of Fe 3 O 4 NPs to decrease.…”

Section: Resultsmentioning

confidence: 99%

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Silver-Decorated and Silica-Capped Magnetite Nanoparticles with Effective Antibacterial Activity and Reusability

Dabagh,

Haris,

Isfahani

et al. 2023

ACS Appl. Bio Mater.

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Fruits are safe, toxin-free, and biomolecule-rich raw materials that may be utilized to decrease metal ions and stabilize nanoparticles. Here, we demonstrate the green synthesis of magnetite nanoparticles which were first capped with a layer of silica, followed by the decoration of silver nanoparticles, termed Ag@SiO2@Fe3O4, by using lemon fruit extract as the reducing agent in a size range of ∼90 nm. The effect of the green stabilizer on the characteristics of nanoparticles was examined via different spectroscopy techniques, and the elemental composition of the multilayer-coated structures was verified. The saturation magnetization of bare Fe3O4 nanoparticles at room temperature was recorded as 78.5 emu/g, whereas it decreased to 56.4 and 43.8 emu/g for silica coating and subsequent decoration with silver nanoparticles. All nanoparticles displayed superparamagnetic behavior with almost zero coercivity. While magnetization decreased with further coating processes, the specific surface area increased with silica coating from 67 to 180 m2 g–1 and decreased after the addition of silver and reached 98 m2 g–1, which can be explained by the organization of silver nanoparticles in an island-like model. Zeta potential values also decreased from −18 to −34 mV with coating, indicating an enhanced stabilization effect of the addition of silica and silver. The antibacterial tests against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) revealed that the bare Fe3O4 and SiO2@Fe3O4 did not show sufficient effect, while Ag@SiO2@Fe3O4, even at low concentrations (≤ 200 μg/mL), displayed high antibacterial activity due to the existence of silver atoms on the surface of nanoparticles. Furthermore, the in vitro cytotoxicity assay revealed that Ag@SiO2@Fe3O4 nanoparticles were not toxic to HSF-1184 cells at 200 μg/mL concentration. Antibacterial activity during consecutive magnetic separation and recycling steps was also investigated, and nanoparticles offered a high antibacterial effect for more than 10 cycles of recycling, making them potentially useful in biomedical fields.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Silver-Decorated and Silica-Capped Magnetite Nanoparticles with Effective Antibacterial Activity and Reusability

Dabagh,

Haris,

Isfahani

et al. 2023

ACS Appl. Bio Mater.

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“…Thus, the degradation of these hazardous environmental pollutants is one of the main challenges in wastewater treatment. In recent years, synthetic nanozymes with peroxidase-like and/or oxidase-like activities have shown great potential for solving the environmental pollution problem resulting from a wide spectrum of organic dyes. , In this work, CV and PF were chosen as model dyes to assess the efficiency of the Fe 3 O 4 /Ag Au nanozyme for the degradation of organic pollutants. As shown in Figure S6a,b, both CV and PF were decolorized in the presence of Fe 3 O 4 /Ag Au nanozyme and H 2 O 2 , and almost colorless solutions were obtained within 1h.…”

Section: Resultsmentioning

confidence: 99%

“…Hou et al reported the Fe 3 O 4 @MIL-100(Fe) nanocomposite with dual enzymatic activity for selective detection of glutathione. To date, a variety of synthetic methods for magnetic Fe 3 O 4 NPs have been developed, such as coprecipitation, hydrothermal synthesis methods, , and electrochemical methods . The time required for the abovementioned methods is 2–8 h and some synthesis methods require even more time.…”

Section: Introductionmentioning

confidence: 99%

Composites of Fe₃O₄, Ag, and Au Nanoparticles for Dye Degradation and Selective Detection of Glutathione

Gao

Liu

et al. 2023

ACS Appl. Nano Mater.

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In comparison with the poor stability, high cost, and difficult preparation of conventional natural enzymes, nanozymes have the obvious advantages of excellent stability, high catalytic activity, multifunctionality, and large-scale preparation. Herein, a series of Fe3O4 NPs-based magnetic composite with dual enzyme-like activities (peroxidase and oxidase) were successfully synthesized by the microwave-assisted method. Among them, the Fe3O4/Ag Au nanocomposite showed the highest peroxidase-like activity due to the synergistic catalytic effect of Ag and Au bimetallic modifications. Enzyme kinetic studies revealed good kinetic parameters of the Fe3O4/Ag Au nanocomposite for peroxidase, and it also exhibited a higher affinity for TMB compared to natural horseradish peroxidase. In addition, a method for effective dye degradation and selective detection of glutathione was constructed based on its peroxidase-like activity. Importantly, the remarkable magnetic separation property and the outstanding stability proved the extensive application prospects of the nanozymes in the remediation of water pollution and some biomarker-specific detection.

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Nanostructures embedded on porous materials for the catalytic reduction of nitrophenols: a concise review

Zheng,

Teo,

Seenivasagam

et al. 2024

J Porous Mater

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Fabrication of Ag nanoparticles supported on amino-functionalized peeled-watermelon structured silica-coated nano-Fe3O4 with enhanced catalytic activity for reduction of 4-nitrophenol

Cited by 13 publications

References 56 publications

Silver-Decorated and Silica-Capped Magnetite Nanoparticles with Effective Antibacterial Activity and Reusability

Silver-Decorated and Silica-Capped Magnetite Nanoparticles with Effective Antibacterial Activity and Reusability

Composites of Fe₃O₄, Ag, and Au Nanoparticles for Dye Degradation and Selective Detection of Glutathione

Nanostructures embedded on porous materials for the catalytic reduction of nitrophenols: a concise review

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Fabrication of Ag nanoparticles supported on amino-functionalized peeled-watermelon structured silica-coated nano-Fe3O4 with enhanced catalytic activity for reduction of 4-nitrophenol

Cited by 13 publications

References 56 publications

Silver-Decorated and Silica-Capped Magnetite Nanoparticles with Effective Antibacterial Activity and Reusability

Silver-Decorated and Silica-Capped Magnetite Nanoparticles with Effective Antibacterial Activity and Reusability

Composites of Fe3O4, Ag, and Au Nanoparticles for Dye Degradation and Selective Detection of Glutathione

Nanostructures embedded on porous materials for the catalytic reduction of nitrophenols: a concise review

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Product

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Composites of Fe₃O₄, Ag, and Au Nanoparticles for Dye Degradation and Selective Detection of Glutathione