Structural and optical properties of europium-doped zinc oxide nanopowders prepared by mechanochemical and combustion reaction methods

Ivetić, Tamara; Dimitrievska, Mirjana; Gúth, I.O.; Đačanin, Lj.R.; Lukić-Petrović, S.R.

doi:10.2478/v10242-012-0012-0

Cited by 29 publications

(18 citation statements)

References 18 publications

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“…The decrease of E bg from 3.21 eV of undoped ZnO to 2.97 eV of Ce-1000 sample can be ascribed to the formation of a shallow level inside the band gap, because of impurity atoms (Ce 3+ ) introduced into the wurtzite ZnO crystalline structure. 47 These results are in agreement with UV-vis absorption results previously described and with recent reports in literature. 45 …”

Section: Resultssupporting

confidence: 93%

Inactivation of an urban wastewater indigenousEscherichia colistrain by cerium doped zinc oxide photocatalysis

et al. 2018

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Heterogeneous photocatalysis (HPC) is a subset of Advanced Oxidation Processes (AOPs) with potential future applications in water disinfection. Herein, a zinc oxide photocatalyst was doped with cerium at various atomic ratios ranging from 0 to 0.1 Ce : Zn. Keeping in mind that the application of HPC is often limited by its cost of use, a simple and easy to upscale method, that is the hydroxide induced hydrolysis of zinc nitrate in the presence of Ce 3+ followed by calcination at 300 C, was used to synthesise the catalysts. The catalysts have been characterized by different techniques such as X-ray diffraction (XRD), UV-vis diffuse reflectance (UV-vis DRS) and Raman spectroscopy. XRD results showed that Ce 3+ ions were successfully incorporated into the ZnO lattice. UV-vis DRS spectra evidenced that Ce-ZnO samples present band-gap values of about 2.97 eV, lower than those of undoped ZnO (3.21 eV). These various photocatalysts, at 0.1 g L À1 in saline 0.85%, were used to inactivate Escherichia coli previously isolated from an urban wastewater treatment plant. Higher atomic ratios of Ce in the ZnO lattice, as confirmed by XRD and Raman spectroscopy, showed significant improvements to the inactivation rate; the resulting recommended optimum cerium loading of 0.04 : 1 Ce : Zn gave multiple orders of magnitude higher rate of inactivation after 60 min of treatment when compared to un-doped ZnO. This optimum loading of cerium was faster than the de facto literature standard TiO 2 -P25 tested under identical conditions.

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Section: Resultssupporting

confidence: 93%

Inactivation of an urban wastewater indigenousEscherichia colistrain by cerium doped zinc oxide photocatalysis

et al. 2018

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“…There is a red shift in absorbance spectra of Dy-doped ZnO in comparison to that of undoped ZnO, as expected for doped materials. This red shift can be related to the formation of a shallow level inside the band gap because of impurity atoms (Dy 3+ ) introduced into the wurtzite ZnO lattice. , Another reason for this shift can be the narrow band gap originating from the charge transfer between the ZnO valence or conduction band and the Dy ion 4f level. , The energy of the band gap of ZnO and 3% Dy-doped ZnO nanoparticles estimated from the main absorption edges of the DRS spectrum is 3.02 and 2.88 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Dysprosium-Doped ZnO Nanoparticles for Photocatalysis of a Textile Dye under Visible Light Irradiation

Khataee

Soltani

Hanifehpour

et al. 2014

Ind. Eng. Chem. Res.

207

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Dy-doped ZnO nanoparticles were synthesized with a sonochemical method. X-ray diffraction, inductively coupled plasma, Fourier transform infrared spectroscopy, UV−vis diffuse reflectance spectroscopy, and scanning electron microscopy analyses confirmed the successfully synthesis and nanometric diameter of the samples. Dy-doped ZnO nanoparticles were used for photocatalytic decolorization of C. I. Acid Red 17 solution under visible light irradiation. Among different amounts of dopant agent, 3% Dy-doped ZnO nanoparticles indicated the highest decolorization. Decolorization efficiency increased from 14.3 to 57.0% with an increase in catalyst dosage from 0.25 to 1 g/L, while further increment in the catalyst dosage up to 2 g/L caused an obvious decrease in decolorization efficiency. The addition of 0.1 mM peroxydisulfate (S 2 O 8 2−) resulted in a decolorization efficiency of nearly 100% after irradiation for 180 min. The trend of inhibitory effect in the presence of different radical scavengers was Cl − > C 2 H 5 OH > HCO 3 − > CO 3 2− .

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“…Regarding Eu-doped ZnO, there is a large variety of structures reported, including thin films, rods/wires, sea urchins, cauliflower-like balls, and powders, achieved by a wide range of chemical and physical synthesis routes, including radio frequency sputtering, − pulsed laser deposition, ion implantion, , chemical vapor deposition, vapor transport deposition, ,− spray pyrolysis, , solid-state synthesis, ,, electrochemical synthesis, − combustion synthesis, − precipitation and hydro-/solvothermal synthesis, − hydrothermal microemulsion processing, sonochemically assisted precipitation, chemical solution deposition, − and metal–organic decomposition . A more detailed review of the results given in these references is provided in Review S1.…”

Section: Introductionmentioning

confidence: 99%

Fast, Low-Cost Synthesis of ZnO:Eu Nanosponges and the Nature of Ln Doping in ZnO

et al. 2020

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A low-cost template-free solution chemical route to highly porous nanocrystalline sponges of ZnO-EuO 1.5 with 0−5 mol % Eu is presented. The process uses Zn− and Eu−acetate− nitrate and triethanolamine as precursors in methanol. After evaporation of the solvent and heating at 200 °C for 3 min, crystalline ZnO:Eu sponges with minor amounts of organic residues were obtained. Heating to 400 °C replaced the organics with carbonate, which in its turn was decomposed at temperatures below 600 °C, forming ZnO:Eu sponges. Samples heated to 200− 1000 °C for 3 min were studied with XRD, SEM, TEM, TG, XPS, and IR spectroscopy. The ZnO:Eu crystallite sizes could be tuned from below 10 nm for sponges prepared at 200−500 °C, to over 100 nm range at 900 °C, without sintering of the overall microstructure. XRD showed the presence of hexagonal ZnO:Eu (or at 700−1000 °C, ZnO:Eu and cubic Eu 2 O 3 ) as the only phases present. The ZnO:Eu had slightly larger unit cell dimensions than the literature value of ZnO for samples obtained at 200−600 °C, while the unit cells of samples obtained at higher temperatures were quite close to the value of undoped ZnO. XPS showed that Eu was mainly in its 3+ state and well-distributed within the sponges but segregated at the ZnO sponge surface upon heating at 700− 1000 °C, in accordance with XRD studies showing Eu 2 O 3 formation.

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Structural and optical properties of europium-doped zinc oxide nanopowders prepared by mechanochemical and combustion reaction methods

Cited by 29 publications

References 18 publications

Inactivation of an urban wastewater indigenousEscherichia colistrain by cerium doped zinc oxide photocatalysis

Inactivation of an urban wastewater indigenousEscherichia colistrain by cerium doped zinc oxide photocatalysis

Synthesis and Characterization of Dysprosium-Doped ZnO Nanoparticles for Photocatalysis of a Textile Dye under Visible Light Irradiation

Fast, Low-Cost Synthesis of ZnO:Eu Nanosponges and the Nature of Ln Doping in ZnO

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