Study of Structural and Magnetic Properties of Superparamagnetic Fe3O4–ZnO Core–Shell Nanoparticles

Shal, Alireza Ahadpour; Jafari, Atefeh

doi:10.1007/s10948-013-2469-9

Cited by 38 publications

(4 citation statements)

References 18 publications

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“…This is in good agreement with the SEM/EDS analysis results described in Figure 1 The uniform and non-aggregated nature of the composite particles can be more easily recognized in TEM images, as shown in Figure 3. Figure 3 displays (Ahadpour et al, 2013). This Fe 3 O 4 @ZnO NC morphology exhibits a typical superparamagnetic behaviour, as measured by VSM and presented in Figure 4.…”

Section: Photocatalytic Degradationmentioning

confidence: 71%

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Winatapura¹,

Dewi²,

Adi³

2016

IJTech

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A magnetic Fe 3 O 4 @ZnO nanocomposite (NC) was successfully synthesized by a wet milling method using a high energy milling (HEM) machine. The magnetic Fe 3 O 4 @ZnO NC was characterized by an X-ray Diffractometer (XRD), scanning and transmission electron microscopes (SEM and TEM), and a vibrating sample magnetometer (VSM @ZnO NC under UV irradiation were quantified by the degradation of a methylene blue (MB) dye solution. The result reveals that the photodegradation efficiency of Fe 3 O 4 @ZnO NC is favorable at pH neutral (pH = 7) reaching 100%. By increasing the MB dye concentration from 10 ppm to 40 ppm, the photodegradation efficiency decreases from 100% to 52%. The Fe 3 O 4 @ZnO NC can be easily collected by an external magnet. The magnetic Fe 3 O 4 @ZnO NC could be extended to various potential applications, such as purification processes, catalysis, separation, and photodegradation.

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Section: Photocatalytic Degradationmentioning

confidence: 71%

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Winatapura¹,

Dewi²,

Adi³

2016

IJTech

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“…The expected benefits are that the coatings of ZnO and SA may prevent aggregation and oxidation of the magnetic NPs. Further, ZnO with bandgap of around 3.37 eV could catalyze the generation of radicals (e.g., OH • ) under UV illuminaton. − The radicals should oxidize the SA molecules on the surface of MNPs and alter hydrophobicity as well as the interactions between MNPs and algae. The shift in surface hydrophobicity under UV illumination may promote the recovery of MNPs from algal slurry.…”

Section: Introductionmentioning

confidence: 99%

Recovering Magnetic Fe₃O₄–ZnO Nanocomposites from Algal Biomass Based on Hydrophobicity Shift under UV Irradiation

Agbakpe

Zhang

et al. 2015

ACS Appl. Mater. Interfaces

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Magnetic separation, one of the promising bioseparation technologies, faces the challenges in recovery and reuse of magnetic agents during algal harvesting for biofuel extraction. This study synthesized a steric acid (SA)-coated Fe3O4-ZnO nanocomposite that could shift hydrophobicity under UV365 irradiation. Our results showed that with the transition of surface hydrophobicity under UV365 irradiation, magnetic nanocomposites detached from the concentrated algal biomass. The detachment was partially induced by the oxidation of SA coating layers due to the generation of radicals (e.g., •OH) by ZnO under UV365 illumination. Consequently, the nanocomposite surface shifted from hydrophobic to hydrophilic, which significantly reduced the adhesion between magnetic particles and algae as predicted by the extended Derjaguin and Landau, Verwey, and Overbeek (EDLVO) theory. Such unique hydrophobicity shift may also find many other potential applications that require recovery, recycle, and reuse of valuable nanomaterials to increase sustainability and economically viability.

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“…Au, MoS 2 , MnO 2 , SiO 2 , ZnO, and TiO 2 have all been used for this purpose. Ahadpour Shal et al reported that the coprecipitation technique was used to make core–shell-type magnetite Fe 3 O 4 @ZnO nanostructures . To improve the adherence of ZnO to the surface of Fe 3 O 4 , the surface was next modified using trisodium citrate.…”

Section: Introductionmentioning

confidence: 99%

“…Ahadpour Shal et al reported that the coprecipitation technique was used to make core–shell-type magnetite Fe 3 O 4 @ZnO nanostructures. 22 To improve the adherence of ZnO to the surface of Fe 3 O 4 , the surface was next modified using trisodium citrate. Hong et al investigated the antioxidant capabilities of the ZnO shell by directly precipitating Fe 3 O 4 @ZnO core–shell particles on a nanoscale scale with zinc acetate and ammonium carbonate.…”

Section: Introductionmentioning

confidence: 99%

Effect on Improving CO₂ Sensor Properties: Combination of HPTS and γ-Fe₂O₃@ZnO Bioactive Glass

Oguzlar,

Zeyrek Ongun,

Deliormanlı

2023

ACS Omega

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Hydroxypyrene-1,3,6-trisulfonic acid (HPTS) dye, a fluorescent dye often used as a pH indicator, is embedded within the bioactive glass matrix and undergoes changes in its fluorescent properties when exposed to carbon dioxide (CO 2 ). The aim of the current study is to investigate the use of bioactive glass (BG) particles containing γ-Fe 2 O 3 @ZnO to enhance the CO 2 sensitivity of HPTS. X-ray diffraction, Fourier transform infrared, scanning electron microscopy, and photoluminescence spectroscopies were used to characterize the sol−gel synthesized powders. The sensing slides were prepared in the form of a thin film by immobilizing the fluorescent dye and γ-Fe 2 O 3 @ZnO-based additives into the poly(methyl methacrylate) matrix. The addition of γ-Fe 2 O 3 @ ZnO nanoparticles with bioactive glass additives to the HPTS improves the performance characteristics of the sensor, including the linear response range, relative signal variation, and sensitivity. Meanwhile, the CO 2 sensitivities were measured as 10.

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Study of Structural and Magnetic Properties of Superparamagnetic Fe3O4–ZnO Core–Shell Nanoparticles

Cited by 38 publications

References 18 publications

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Recovering Magnetic Fe₃O₄–ZnO Nanocomposites from Algal Biomass Based on Hydrophobicity Shift under UV Irradiation

Effect on Improving CO₂ Sensor Properties: Combination of HPTS and γ-Fe₂O₃@ZnO Bioactive Glass

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Study of Structural and Magnetic Properties of Superparamagnetic Fe3O4–ZnO Core–Shell Nanoparticles

Cited by 38 publications

References 18 publications

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Synthesis, Characterization, and Photocatalytic Activity of Fe3O4@Zno Nanocomposite

Recovering Magnetic Fe3O4–ZnO Nanocomposites from Algal Biomass Based on Hydrophobicity Shift under UV Irradiation

Effect on Improving CO2 Sensor Properties: Combination of HPTS and γ-Fe2O3@ZnO Bioactive Glass

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Product

Resources

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Recovering Magnetic Fe₃O₄–ZnO Nanocomposites from Algal Biomass Based on Hydrophobicity Shift under UV Irradiation

Effect on Improving CO₂ Sensor Properties: Combination of HPTS and γ-Fe₂O₃@ZnO Bioactive Glass