Synthesis, characterization and environmental remediation applications of polyoxometalates-based magnetic zinc oxide nanocomposites (Fe3O4@ZnO/PMOs)

Ammar, Saad H.; Abdulnabi, Waqar A.; kader, Huda D. Abdul

doi:10.1016/j.enmm.2020.100289

Cited by 27 publications

(13 citation statements)

References 29 publications

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“…Among the oxides, ZnO has been thoroughly investigated because of its properties, such as a wide band gap (~3.35 eV) with a high exciton binding energy of (~60 meV), wurtzite crystal structure, piezoelectric properties, and relatively low cost [36,37], which make it a suitable candidate for energy conversion/storage, high-performance electronics, photocatalysis, sensors, solar cells, and supercapacitors [38][39][40][41][42]. In addition, it is applied in environmental remediation [43,44], as a biocide, and as a nanofertilizer in agriculture [45,46].…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Syntheses of ZnO and Their Structures

et al. 2021

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ZnO has many technological applications which largely depend on its properties, which can be tuned by controlled synthesis. Ideally, the most convenient ZnO synthesis is carried out at room temperature in an aqueous solvent. However, the correct temperature values are often loosely defined. In the current paper, we performed the synthesis of ZnO in an aqueous solvent by varying the reaction and drying temperatures by 10 °C steps, and we monitored the synthesis products primarily by XRD). We found out that a simple direct synthesis of ZnO, without additional surfactant, pumping, or freezing, required both a reaction (TP) and a drying (TD) temperature of 40 °C. Higher temperatures also afforded ZnO, but lowering any of the TP or TD below the threshold value resulted either in the achievement of Zn(OH)2 or a mixture of Zn(OH)2/ZnO. A more detailed Rietveld analysis of the ZnO samples revealed a density variation of about 4% (5.44 to 5.68 gcm−3) with the synthesis temperature, and an increase of the nanoparticles’ average size, which was also verified by SEM images. The average size of the ZnO synthesized at TP = TD = 40 °C was 42 nm, as estimated by XRD, and 53 ± 10 nm, as estimated by SEM. For higher synthesis temperatures, they vary between 76 nm and 71 nm (XRD estimate) or 65 ± 12 nm and 69 ± 11 nm (SEM estimate) for TP =50 °C, TD = 40 °C, or TP = TD = 60 °C, respectively. At TP = TD = 30 °C, micrometric structures aggregated in foils are obtained, which segregate nanoparticles of ZnO if TD is raised to 40 °C. The optical properties of ZnO obtained by UV-Vis reflectance spectroscopy indicate a red shift of the band gap by ~0.1 eV.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Syntheses of ZnO and Their Structures

et al. 2021

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“…Despite the saturation of Fe 3 O 4 @ZnO-Bru NCs decreased to 33.56 International Journal of Nanomedicine 2022:17 https://doi.org/10.2147/IJN.S372377 DovePress 3389 Dovepress emu•g -1 due to the loading of Bru in comparison with the 41.50 emu•g -1 of Fe 3 O 4 @ZnO, their magnetic response was not influenced because they were gathered together within 5 min under an external magnetic field (Figure 2D insert), which indicated a great magnetic response ability. In consideration of other nano biomaterials based on Fe 3 O 4 @ZnO, 20,21 it can be inferred that Fe 3 O 4 @ZnO-Bru NCs had good magnetic separating and targeting properties. They, therefore, have the potential of magnetic targeting.…”

Section: Resultsmentioning

confidence: 99%

Smart Fe3O4@ZnO Core-Shell Nanophotosensitizers Potential for Combined Chemo and Photodynamic Skin Cancer Therapy Controlled by UVA Radiation

Ren¹,

Yi²,

Pan³

et al. 2022

IJN

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Photodynamic therapy (PDT) is a non-invasive therapeutic modality that is used for several types of cancer and involves three essential elements (light, photosensitizer (PS), and oxygen). However, clinical PS is limited by the low yield of reactive oxygen species (ROS) and a long retention time. Therefore, developing a low-cost PS that can significantly increase ROS yield in a short time is of utmost importance. Methods: In this study, brusatol (Bru) was loaded on the surface of ultraviolet A (UVA)-responsive zinc oxide (ZnO)-coated magnetic nanoparticles (Fe 3 O 4 @ZnO-Bru). The PS was well characterized by transmission electron microscopy (TEM), Fourier Transform infrared spectroscopy (FTIR), a superconducting quantum interference device, and dynamic light scattering (DLS). 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) and Hoechst staining were used to determine the inhibitory effect of Fe 3 O 4 @ZnO-Bru on squamous cell carcinoma cells (SCC) with or without UVA radiation. Intracellular ROS levels and expression of the Nrf2 signaling pathway were also determined. Results: FTIR showed that Bru was successfully loaded on Fe 3 O

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“…Thus, Fe3O4 nanoparticles have been utilized as catalyst/support and co-catalyst in a variety of reactions including Fenton-type oxidations, Hydrogenation of arenes and olefins, Oxidation of alcohols/olefins and nitro compound reduction (Ma et al, 2019;Vieira et al, 2020). In the past decade, the use of zinc oxide in the fabrication of magnetic core@shell structures has increased remarkably (Ammar et al, 2020;Wang et al, 2016;Wu et al, 2012). This is mainly attributed to the semiconducting property of ZnO and to the fact that it is much cheaper than TiO2 (Bahtiar et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of Fe3O4@ZnO-supported Pd nanoparticles for oxidation and hydrogenation reactions in liquid systems

Souto

Razini²,

Kauffmann³

et al. 2022

RSD

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In this work Pd nanoparticles immobilized on a hybrid solid support comprised of Fe3O4 coated by a ZnO layer were synthesized by a green method which makes use of water, a biological substrate from a local plant (Rhamnidium elaeocarpum) and inexpensive Fe3+ and Zn2+ salts. 1H-NMR and 13C-NM revealed β-sitosterol as the main component of the biological substrate. The catalytic support containing Pd nanoparticles was applied in three model solid-liquid catalytic systems, namely: alcohol oxidation, nitrocompound reduction and olefin hydrogenation. For the alcohol oxidation, benzyl alcohol was used as the substrate in a solvent-free condition with high selectivity towards benzaldehyde, and a single sample of the catalyst could be recycled up to 11 times before any loss of activity could be detected. TOF (turnover frequency) as high as 13,686 h-1 for the substrate oxidation was achieved with an average yield rate of 45.4% for formation of benzaldehyde and 81.6% of average substrate conversion after 6 catalytic cycles. For the hydrogenation experiments using cyclohexene and 4-nitrophenol as model substrates, conversion as high as 96% to 4-aminophenol and cyclohexane, respectively, was achieved after 30 minutes of reaction. Furthermore, a single sample of the catalyst could be recycled for up to 17 times for the reduction of 4-nitrophenol, and 21 times in the hydrogenation of cyclohexene. Catalytic recycling for all studied reactions was straightforward after due to the superparamagnetic property of the material, and catalyst isolation after each batch could be rapidly carried out using a Nd magnet. These results suggests that a highly active and stable catalytic system based on Pd nanoparticles supported on a multifunctional solid could be fabricated using green and inexpensive biomass under operationally simple synthesis conditions.

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Synthesis, characterization and environmental remediation applications of polyoxometalates-based magnetic zinc oxide nanocomposites (Fe3O4@ZnO/PMOs)

Cited by 27 publications

References 29 publications

Room Temperature Syntheses of ZnO and Their Structures

Room Temperature Syntheses of ZnO and Their Structures

Smart Fe3O4@ZnO Core-Shell Nanophotosensitizers Potential for Combined Chemo and Photodynamic Skin Cancer Therapy Controlled by UVA Radiation

Green synthesis of Fe3O4@ZnO-supported Pd nanoparticles for oxidation and hydrogenation reactions in liquid systems

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