Microwave-assisted route for synthesis of nanosized metal oxides

Lagashetty, Arunkumar; Havanoor, Vijayanand; Basavaraja, S.; Balaji, S.; Venkataraman, A.

doi:10.1016/j.stam.2007.07.001

Cited by 104 publications

(46 citation statements)

References 21 publications

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“…The oxygen vacancies quantity in MAH samples is more elevated than MPP samples [19,24,85] (FTIR results in Figure S2, and PL results in Figure S3), which modifies the RhB degradation mechanism, improving the MAH photocatalytic efficiency. .…”

Section: Consequently [As] Is Incorporated Into Kinetic Rate (K) Thmentioning

confidence: 99%

“…Hence, MPP method does not allow morphology control or size distribution, producing almost quasi-spherical particles, while MAH method is an easy, fast and principally inexpensive method in synthesized materials with enhanced properties. MAH methods demonstrate several advantages as one-step synthesis method with controlled size and shape since no high temperature, or high pressure is needed [22][23][24][25]. In particular, Niederberger et al have shown that microwave-assisted nonaqueous sol-gel method is an efficient procedure for obtaining nanocrystalline metal oxides, including ZnO and transition metal doped ZnO nanoparticles, within just a few minutes [25].…”

Section: Introductionmentioning

confidence: 99%

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The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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Photocatalytic materials can perform oxidative and reductive reactions over their surfaces when excited with light. Intrinsic characteristics of the material such as superficial area, morphological structure, and crystalline phase exposition play a fundamental role in the corresponding reaction paths. However, especially in doped semiconductors, as ZnO:N, less is known about how the synthesis parameters affect the morphologies and the photocatalytic activity simultaneously. To solve this issue, ZnO and ZnO:N samples were obtained using microwave-assisted hydrothermal and modified polymeric precursor methods of synthesis. Samples morphologies were characterized by TEM and FE-SEM. Crystallographic phases were observed by XRD and optical characteristics by DRS. XPS results confirmed the doping process. Degradation of Rhodamine-B and Cr(VI) reduction were employed as probe reactions to investigate their photocatalytic activity. Although the crystallographic structure of these powders maintains the ZnO hexagonal wurtzite structure, the optical properties and morphologies, and photocatalytic activities present different behaviors. Also, density functional theory calculations were employed to determine the specific features related to electronic structure, morphology, and photocatalytic activity.Different synthesis methods produce a singular behavior in the physicochemical properties of materials, and the doping effect produces various modifications in RhB degradation and Cr(VI) reduction for each synthesis method. Crystal face exposition and morphologies are related to the improvement in the photocatalytic activity of the materials.

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Section: Consequently [As] Is Incorporated Into Kinetic Rate (K) Thmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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“…No further heat treatment is required for sample production. Microwaves are also used in synthesis to improve the nanometer size fraction of particles 16 and to enhance structural and morphological properties for the nanomaterials 17,18 . In addition, microwaves appear today as a new technology for the development of the green chemistry, with synthesis methods involving preparation procedures based on solvent-free or reduced amount of reactants 14 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Activity of Pure Anatase Tio2 and Pt-Tio2 Nanoparticles Synthesized by Green Microwave Assisted Route

Filippo

Carlucci²,

Capodilupo³

et al. 2015

Mat. Res.

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High-yield, rapid and facile synthesis of elongated pure anatase titania nanoparticles has been achieved through a nonaqueous microwave-based approach. The residual organics onto nanoparticles surfaces were completely removed through a new treatment under ozone flow, at room temperature in air. Such an ozone cleaning method revealed an effective inexpensive dry process of removing organic contaminants from nanoparticles surfaces. The TiO 2 elongated nanoparticles having a length of 13.8 ± 5.5 nm and a diameter of 9.0 ±1.2 nm were characterized by powder X-Ray diffraction, transmission electron microscopy, selected area diffraction, BET surface area analyzer and FT-IR spectroscopy. Photocatalytic evaluation demonstrated that the as-synthesized ozone-cleaned TiO 2 nanoparticles and TiO 2 nanoparticles loaded with platinum possess excellent Rhodamine B performance with respect to both commercial spherical nanotitania P25 and P25 loaded with platinum. This could be attributed to the anatase phase purity, small size, large specific surface area and clean surfaces of the prepared nanoparticles.

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“…39 As can be noted from the spectrum of each sample, the peak in the range of 1010 -1079 cm . 40 The appearance of these bands indicates that the MoO 3 is strongly dispersed on the surface of CeO 2 -ZrO 2 catalyst.…”

Section: Resultsmentioning

confidence: 89%

Synthesis, Characterization and Catalytic Application of MoO₃/CeO₂-ZrO₂Solid Heterogeneous Catalyst for the Synthesis of Benzimidazole Derivatives

Rathod¹,

Lande²,

Arbad³

2010

Bulletin of the Korean Chemical Society

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A series of MoO3/CeO2-ZrO2 catalysts with different Mo content (8 -20 wt %) were prepared by simple co-precipitation followed by impregnation method and were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), energy dispersive spectroscopic (EDS) techniques. The prepared materials were tested for catalytic activity by the synthesis of benzimidazole derivatives using condensation of aromatic aldehydes and o-phenylenediamine by conventional and microwave method. Obtained results reveal that the catalytic activity increases with increase in Mo wt % loading. The best catalytic activity was obtained with 20 wt % MoO3/CeO2-ZrO2. The particle size or crystallite size was estimated using Debye-Scherrer equation. After completion of reaction, the catalyst can be recovered efficiently and reused with consistent activity.

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Microwave-assisted route for synthesis of nanosized metal oxides

Cited by 104 publications

References 21 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Enhanced Photocatalytic Activity of Pure Anatase Tio2 and Pt-Tio2 Nanoparticles Synthesized by Green Microwave Assisted Route

Synthesis, Characterization and Catalytic Application of MoO₃/CeO₂-ZrO₂Solid Heterogeneous Catalyst for the Synthesis of Benzimidazole Derivatives

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Microwave-assisted route for synthesis of nanosized metal oxides

Cited by 104 publications

References 21 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Enhanced Photocatalytic Activity of Pure Anatase Tio2 and Pt-Tio2 Nanoparticles Synthesized by Green Microwave Assisted Route

Synthesis, Characterization and Catalytic Application of MoO3/CeO2-ZrO2Solid Heterogeneous Catalyst for the Synthesis of Benzimidazole Derivatives

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Synthesis, Characterization and Catalytic Application of MoO₃/CeO₂-ZrO₂Solid Heterogeneous Catalyst for the Synthesis of Benzimidazole Derivatives