Microwave Synthesis, Characterization, and Photoluminescence Properties of Nanocrystalline Zirconia

Singh, A. K.; Nakate, Umesh T.

doi:10.1155/2014/349457

Cited by 114 publications

(64 citation statements)

References 35 publications

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“…The FTIR (Figure 2) was used to confirm the functional groups. The observed peak at 374-400 cm −1 was attributed to Zr-O vibration, which confirmed the ZrO 2 structure [62]. The observed peak at 551 cm −1 and around 700 cm −1 was attributed to Fe [63].…”

Section: Characterization Of Bimetallic Oxide-diatom Compositesupporting

confidence: 59%

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

Thakkar

Mitra

2017

Journal of Nanomaterials

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Frustules or the rigid amorphous silica cell wall of unicellular, photosynthetic microalgae with unique porous architecture has been used to synthesize a composite by immobilizing zirconium and iron oxides on its surface and in the pores. This was effective for removal of Se from water, which is an emerging contaminant that is a micronutrient at low concentrations but toxic at high concentrations. The adsorption isotherms followed both Langmuir and Freundlich models, and the composite was regenerable. The Langmuir maximum adsorption capacity for Se(IV) ( ) was 227 mg/g, which is among the highest ever reported. The research findings highlight the synthesis of bimetallic composite as well as the potential of diatoms as hosts for nanomaterials for use in water treatment.

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Section: Characterization Of Bimetallic Oxide-diatom Compositesupporting

confidence: 59%

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

Thakkar

Mitra

2017

Journal of Nanomaterials

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“…In addition, it is well known that the specific surface area and particle size values have an inverse relation to each other, which can be represented by Eq. (3), where S is the specific surface area (BET), 6 is a constant that is used when a spherical geometry of the particles is considerate, ρ is the specific mass of the compound and d is the particle size 49,50 . In other words, small particle sizes result in high specific surface area values.…”

Section: Resultsmentioning

confidence: 99%

Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion

et al. 2017

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In this paper, magnesium aluminate spinels were prepared by microwave-assisted combustion, using urea as fuel. In order to evaluate the effect of the urea excess used in the synthesis, its mass was added in a range of 1.0 to 2.5 times the stoichiometric amount required. The materials produced were characterized by TGA, FTIR, XRF, XRD, BET, SEM and TEM. The results demonstrated that magnesium aluminate spinel was formed in all solids, but the crystallinity degree and the specific surface area increased according to the amount of urea that was used in the synthesis. The use of excess fuel in the preparation was therefore advantageous, since it eliminated the need of the calcination step, at high temperatures, in order to stabilize the spinel phase and improve the crystallinity of the solid. The heat generated in the combustion process was sufficient to develop the formation of a nanocrystalline structure and produce high purity materials, with a save of 99.4% in energy.

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“…It is also evident that the catalysts are small in size due to the broad nature of the peaks. Crystallite sizes of catalysts were calculated using the DebyeScherrer's equation: 29 ( 1) where, D is the crystallite size, K is a shape factor with a value of 0.9, λ is the wavelength of the X-ray (0.1541 nm), β is the value of full width at half maximum (FWHM) in the radiation of (101) plane in 2θ scale, and θ is the Bragg's diffraction angle at the maximum. The crystallite sizes were found to be 23 …”

Section: Powder Xrd Analysismentioning

confidence: 99%

Comparative photocatalytic degradation of monoazo and diazo dyes under simulated visible light using Fe3+/C/S doped-TiO2 nanoparticles

Anku

Oppong²,

Shukla³

et al. 2016

ACSi

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This research work delved into the photocatalytic degradation of monoazo dye (methyl orange) and diazo dye (congo red) in aqueous solution using Fe 3+ /C/S-doped TiO 2 nanocomposites. The nanocomposites were synthesised through sol-gel method and characterized using XRD, FTIR, SEM, TEM, EDX, BET and UV-Vis. Photocatalytic degradation of the dyes was monitored under simulated visible light using pristine TiO 2 , C/S/doped-TiO 2 and Fe 3+ /C/S doped-TiO 2 with varying concentrations of Fe 3+ . The influence of catalyst doping, solution pH, and light intensity were also examined. Doping TiO 2 with Fe 3+ /C/S caused reduction in its band gap value with the resultant improvement in its visible light activity. The photocatalytic efficiency of the catalysts is given as follows: TiO 2 < C/S/TiO 2 < Fe 3+ /C/S-TiO 2 with Fe 3+ /C/S-TiO 2 (0.3% Fe 3+ ) as the best performing photocatalyst. The monoazo dye experienced higher degradation efficiency than the diazo dye. Degradation of the azo dyes was observed to decrease with increasing pH from 2 to 12. Increased visible light intensity enhanced the photodegradation efficiency of the dye. Dye decolourization was observed to be faster than its mineralization.

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Microwave Synthesis, Characterization, and Photoluminescence Properties of Nanocrystalline Zirconia

Cited by 114 publications

References 35 publications

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

Bimetallic Oxide Nanohybrid Synthesized from Diatom Frustules for the Removal of Selenium from Water

Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion

Comparative photocatalytic degradation of monoazo and diazo dyes under simulated visible light using Fe3+/C/S doped-TiO2 nanoparticles

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