Flame spray pyrolysis synthesis of ceramic nanopigments CoCr2O4: The effect of key variables

Granados, Natalia Betancur; Baena, Óscar Jaime Restrepo

doi:10.1016/j.jeurceramsoc.2017.06.024

Cited by 23 publications

(4 citation statements)

References 19 publications

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“…00-022-1084), and are in strong agreement with findings from references [35,36]. On the other hand, the ZrO2 peaks exist at diffraction angles (111), ( 200), (220), and (311) with four locations of 2θ that equal to 30.2973°, 35.0778°, 50.4580°, and 59.9693°, respectively(JCDS card No.00-049-1642) [36,37]. The XRD analysis for the prepared composites confirms these findings match with the standard diffraction data for CoCr2O4 and ZrO2 [2,38].…”

Section: A Structural Propertiessupporting

confidence: 86%

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

2021

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In this project, the deep green power from spinel cobalt chromite (CoCr2O4) nano-crystals carried out using the coprecipitation method and then calcinated at 600 o C for 4 hours. This produced nano-crystal (spinel CoCr2O4) fabricated using the ultrasonic technique to link it with zirconium dioxide (ZrO2) in ratios 1:2 and 1:3, respectively. The X-ray diffraction (XRD), scan electron microscopy (SEM), and energy-dispersive X-rays (EDX), as well as ultraviolet-visible spectrophotometry used to describe the characterizations of prepared materials. The XRD analysis demonstrated that the spinel CoCr2O4 synthesis and their composites were found to be nanoparticles. XRD spectra indicated that the spinel CoCr2O4 is successfully loaded on ZrO2, because, the 2θ of ZrO2 is shifted toward a high 2θ value after spinel CoCr2O4 loaded. This case is attituded to the tiny Co 2+ and Cr 3+ ions combined with Zr 4+ in crystal lattice. The SEM images and EDX spectra of these obtained nanomaterials were found to be spherical agglomerations with an enhanced degree of surface roughness after surface fabrication. On the other side, the bandgap of spinel CoCr2O4 nanocrystals elevated from 3.2 to 4.8 eV with increasing the ZrO2 dose. Under UV-A light, the photocatalytic decolorization efficiency of Fe (II)-(luminol-Tyrosine) complex utilizing spinel CoCr2O4 nanocrystals was tested, and it increases from 17.57 % to 30.67% and 41.97% when its nanocomposite was used in 1:2 and 1:3 ratios, respectively. The elevated efficiency after modified the spinel CoCr2O4 surface with ZrO2 as nanocomposite, due to increasing the acidity of the spinel CoCr2O4 surface that enhances the adsorption of hydroxyl on its surface then generality of the hydroxyl radical, and reducing the recombination. The photoreaction using spinel CoCr2O4 nanocrystals, ZrO2, and their composites were followed pseudo-first-order kinetics depended on the complex concentration.

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Section: A Structural Propertiessupporting

confidence: 86%

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

2021

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“…Durante la síntesis, las condiciones de procesamiento y sus efectos combinados, impactan las propiedades del material, permitiendo manipular las características de los productos [37,38]. De ahí, que uno de los mayores desafíos de los investigadores es comprender la relación entre las condiciones de operación intrínsecas y extrínsecas y su influencia sobre propiedades de las partículas, obteniendo una visión integral del proceso [8], [13].…”

Section: Condiciones Del Proceso De Síntesisunclassified

Estudio general del método de síntesis de pirólisis de aerosol en llama

2021

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RESUMO Pirólisis de aerosol en llama (FSP), es una de las metodologías más prometedoras en la producción de nanopartículas a gran escala, dado su potencial de escalamiento y producción en continuo. Este artículo aborda los fenómenos químicos y físicos ocurridos durante el proceso, desde la preparación de la solución de precursores, los procesos de transformación en la llama y la formación de nanopartículas, los cuales permiten explicar las propiedades de los productos de reacción. Finalmente, se presenta el equipo de síntesis, sus componentes y la importancia del diseño del equipo sobre las propiedades de los materiales.

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“…That is the reason why the correct control and optimization of these stages can reduce the manufacturing cost without a loss of color properties, or even with their improvement [2]. Several alternative preparation methodologies have been proposed for the synthesis routes of ceramic pigments [3][4][5][6][7][8], but one of the most useful and easy to move to industrial processes, thanks to its simplicity, is coprecipitation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study of the Synthesis Variables in the Preparation of CoAl2O4 Pigment Using Microwaves to Reduce Energetic Consumption

Paulo-Redondo,

Nebot-Díaz

2023

Eng

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Due to the importance of optimizing the manufacture of ceramic pigments, motivated by the increase in prices of both raw materials and energy, and the need to control manufacturing parameters to obtain optimal conditions for the preparation of ceramic inks, two synthesis routes (traditional route and coprecipitation) and two calcination methods (traditional oven and microwave oven) are proposed to obtain the blue ceramic pigment CoAl2O4 with the aim of minimizing the use of mineralizers or flux agents and reducing energy consumption in its manufacturing. The pigments prepared were characterized by thermal analysis and structurally by XRD and SEM, with particle sizes below 300 nm observed. Finally, the colorimetric coordinates of glazed tiles with the pigments obtained were characterized. In all cases, the microwave-assisted synthesis increased the color intensity, considerably decreasing the temperature and calcination time, obtaining a particle size under 300 nm with a very narrow size distribution, and substantially improving the energy cost of its preparation and the color development of the final product. The viability of the combination of synthesis by coprecipitation and microwave calcination as a method of industrial preparation of ceramic pigments has been demonstrated.

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Flame spray pyrolysis synthesis of ceramic nanopigments CoCr2O4: The effect of key variables

Cited by 23 publications

References 19 publications

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

Facile Synthesis of Spinel CoCr2O4 and Its Nanocomposite with ZrO2: Employing in Photo‐catalytic Decolorization of Fe (II)-(luminol-Tyrosine) Complex.

Estudio general del método de síntesis de pirólisis de aerosol en llama

Study of the Synthesis Variables in the Preparation of CoAl2O4 Pigment Using Microwaves to Reduce Energetic Consumption

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