Sol-gel synthesis, characterization and photocatalytic activity of mixed oxide ZnO-Fe2O3

Hernández, Ana Cristina Gallego; Maya, Lourdes; Sánchez-Mora, E.; Sánchez, E.

doi:10.1007/s10971-006-1521-7

Cited by 149 publications

(64 citation statements)

References 26 publications

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“…Also shown is the infrared spectrum for the sample dried at 100˚C for 4 h and further annealed 800˚C for 6 h (curve e). For all as-synthesized samples the strong absorption peaks in the range of 400 -700 cm −1 could be attributed to ZnO stretching modes [28,29]. These stretching modes are indicative of successful synthesized of nanocrystalline ZnO particles as already confirmed by XRD and EDX studies.…”

Section: Resultssupporting

confidence: 71%

Synthesis and Spectroscopic Characterization of Undoped Nanocrytalline ZnO Particles Prepared by Co-Precipitation

Prakoso¹,

Saleh²

2012

MSA

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A series of undoped nanocrystalline ZnO particles were successfully synthesized at various dry temperatures (100˚C -600˚C) using coprecipitation method. The samples were characterized using a variety of experimental methods such as x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX), thermal analysis TG-DTA, UV-vis spectroscopy, infrared absorption spectroscopy (FTIR) and electron spin resonance spectroscopy (ESR). According to XRD analysis, all of our ZnO samples posses the hexagonal wurzite structure with average crystallite size increased ranging from 19 -23 nm as dry temperature increased. Optical absorption spectra show that the band gap shifted to the lower energy with increasing crystallite size. ESR measurements showed the resonance of electron centers with the g values of about 1.96. With increasing dry temperature we observed the decrease of the g values and the increase of the intensities of the ESR signal. In addition an increase in dry temperature results in a pronounce decrease of OH local vibrational modes. The results from ESR measurements are well supported by the results obtained from Infrared absorption spectroscopy and thermal analysis measurements.

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Section: Resultssupporting

confidence: 71%

Synthesis and Spectroscopic Characterization of Undoped Nanocrytalline ZnO Particles Prepared by Co-Precipitation

Prakoso¹,

Saleh²

2012

MSA

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“…There is intense absorption below the wavelength of 400 nm for commercial and self-prepared ZnO, which is known as a strong absorption of ZnO. This absorption is corresponded to a charge-transfer process from the valence band (O 2p orbits) to the conduction band (Zn 4s orbits) [45,46]. The absorption spectra of ZnO-96, ZnO-88, ZnO-75 and ZnO-67 show the characteristic absorption of ZnO.…”

Section: Uv-vis Characterizationmentioning

confidence: 99%

High-temperature steam reforming of methanol over ZnO–Al2O3 catalysts

Yang

Chen

2011

Applied Catalysis B: Environmental

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“…Evidence of the presence of zinc comes from the wider bands observed in the region of 400-700 cm -1 in the SBAZn nanocomposites spectra compared to SBA-15 [19,28,29]. The stretching modes of Zn-O appear around 460, 550 and 600 cm -1 , but these bands could be covered by the stretching bands (δ[O-Si-O], around 500 cm -1 ) of silica appearing in the same region [29][30][31][32][33]. Cell Proliferation Assays The data obtained from the cell proliferation assays is shown in Figure 6.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

ZnO:SBA-15 Nanocomposites for Potential Use in Sunscreen: Preparation, Properties, Human Skin Penetration and Toxicity

Vieira

Grice

Roberts

et al. 2018

Skin Pharmacol Physiol

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Aim: We evaluated the effects of the incorporation of zinc oxide (ZnO) nanoparticles in a mesoporous matrix, aiming to improve the textural, structural and morphological properties and verify their safety so that they can be applied in sunscreen cosmetics. Materials and Methods: ZnO nanoparticles were incorporated into an ordered mesoporous silica matrix known as Santa Barbara Amorphous-15 (SBA-15), using post-synthesis methodology. The resulting nanocomposites were characterized using X-ray diffraction, small angle X-ray scattering, N₂ adsorption-desorption isotherms, Fourier transform infrared spectroscopy, scanning electron microscopy and predicted in vitro sun protector factor (SPF) estimation. Effectiveness and safety were evaluated by antimicrobial activity, in vitro cell toxicity and non-invasive multi-photon tomography with fluorescence lifetime imaging. Results: The structure of the nanocomposites was similar to that of SBA-15, with little perturbation caused by ZnO incorporation. Nanocomposites had an increased in vitro SPF, reduced cytotoxic activity and favourable antimicrobial properties compared to ZnO. ZnO:SBA-15 nanocomposites exhibited no measurable toxicity when applied to human skin in vivo. Conclusion: Due to their suitable physicochemical properties and improved safety compared to bare ZnO nanoparticles, the ZnO:SBA-15 nanocomposites show promise for use in cosmetic applications.

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Sol-gel synthesis, characterization and photocatalytic activity of mixed oxide ZnO-Fe2O3

Cited by 149 publications

References 26 publications

Synthesis and Spectroscopic Characterization of Undoped Nanocrytalline ZnO Particles Prepared by Co-Precipitation

Synthesis and Spectroscopic Characterization of Undoped Nanocrytalline ZnO Particles Prepared by Co-Precipitation

High-temperature steam reforming of methanol over ZnO–Al2O3 catalysts

ZnO:SBA-15 Nanocomposites for Potential Use in Sunscreen: Preparation, Properties, Human Skin Penetration and Toxicity

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