Influence of calcination on the morphology and crystallinity of titanium dioxide nanofibers towards enhancing photocatalytic dye degradation

Soo, Joshua Zheyan; Ang, Bee Chin; Ong, Boon Hoong

doi:10.1088/2053-1591/aaf013

Cited by 13 publications

(11 citation statements)

References 74 publications

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“…Some recent works have reported on heat treatment of titanium oxides [10][11][12][13][14]. As the treatment temperatures in their work were up to 500°C, which is much lower than that in our present work, royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Introductioncontrasting

confidence: 62%

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

et al. 2020

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Nano-size EVONIK AEROXIDE ® P25 titanium dioxide, TiO 2 , powder was heat-treated at temperatures, 700–900°C, in air. An X-ray diffraction study showed that the P25 powder is composed of approximately 20 and approximately 80 mass% of rutile and anatase phases, respectively. It was also shown that the transformation from anatase to rutile induced by high-temperature heat treatment was almost completed at 750°C, whereas a small amount (less than 3 mass%) of anatase phase was still left even in the powder heat-treated at 900°C. The transformation behaviour was consistent with results obtained by Raman scattering spectroscopy. Raman experiments also indicated that high-temperature heating induced the formation of oxide ion vacancies. Powders were dispersed in methyl orange (MO) aqueous solution, and the bleach rate of MO was measured to evaluate photocatalytic activity under ultraviolet (UV)- and visible-light irradiation. After the heat treatment, the UV-light photocatalytic performance sharply deteriorated. Interestingly, visible-light photocatalytic activity was enhanced by high-temperature heating and reached the highest performance for an 800°C-heated sample, indicating that the P25 powder obtained high visible-light photocatalytic performance after heat treatment. Even after 900°C heat treatment, the photocatalytic performance was higher than that of as-received powder. Enhancement of photocatalytic activities was discussed in relation to visible light absorption and charge carrier transfer.

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Section: Introductioncontrasting

confidence: 62%

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

et al. 2020

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“…From the initial and final concentrations of Rhodamine B the degradation efficiency was calculated for the prepared samples, and these values are summarized in Table 1 Furthermore, it can be observed that the calcined counterpart of a composite has a higher efficiency, for example, NYF-TiO 2 _calc has an efficiency of 86%, while for the corresponding non-calcined composite (NYF-TiO 2 ) this value is 49.7%. Calcination promoted crystallization (crystalline anatase is formed), thus increased the photocatalytic activity [34]. The presence of gold in some composites improved the photocatalytic activity, which could be explained as a result of charge separation [41].…”

Section: Photocatalytic Activity Under Uv Lightmentioning

confidence: 98%

“…In all cases the Au content was 1 wt.%, which was based on the fact that in the literature the 1-2 % Au content proved to be the most beneficial to improve the photocatalytic activity [33]. During the synthesis only the reduction of Au took place, because it is not possible to reduce the Ti in TiO 2 , because this process needs extremely high temperature and inert atmosphere [34].…”

Section: Synthesis Of Composites Decorated With Au Nanoparticlesmentioning

confidence: 99%

The impact of Au nanoparticles and lanthanide-doped NaYF4 on the photocatalytic activity of titania photocatalyst

Hampel

Hernádi

Baia

et al. 2021

Applied Surface Science

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…The effect of calcination on the crystallite size of samples was evaluated for the three samples 150-4-C, F180-4-C, and F180-8-C. According to Figure 8, the crystallite size of the samples increases by calcination at 500 °C for 1 h. The growth in the crystallite size of the samples after calcination is due to the reduction in activation energy of crystallization, which enhances the crystal growth rate in the as-prepared nanostructured hematite [32,33]. The enhancement of crystallite size and subsequent low density of crystalline defects of the nanostructured α-Fe2O3 crystals is desirable in some applications [34,35].…”

Section: Calcinationmentioning

confidence: 99%

Nanostructured α-Fe2O3: Solvothermal Synthesis, Characterization, and Effect of Synthesis Parameters on Structural Properties

2022

IJE

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α-Fe2O3 is a stable, cheap, and non-toxic metal oxide with many advantages and different fields of application. Many attempts have been devoted to the synthesis of α-Fe2O3 with different crystal structures and morphologies to obtain the desired properties. In this research, nanostructured α-Fe2O3 were synthesized by a facile solvothermal route. The as-obtained samples are characterized by XRD, FESEM, EDS, FTIR, and BET surface area analysis. The results showed that the as-synthesized hematite consists of nanostructures with the morphology of distorted microspheres with an average diameter in the range of 1 to 1.5 µm each composed of self-assembled nanoparticles with an average size in the range of 10 to 30 nm. The results showed that the hematite nanostructures had a specific surface area of 41.86 m 2 g -1 . The influence of temperature and duration of the solvothermal process as well as, calcination on the structural properties of the α-Fe2O3 samples was investigated. The results reveal that the crystallite size of the samples increases with increasing the temperature and duration of solvothermal treatment. Moreover, calcination leads to an increase in the crystallite size of the samples. The α-Fe2O3 nanostructures with a minimum crystallite size of 13.6 nm were synthesized at 150 °C for 4 h while the largest crystallite size of 75.4 nm was obtained at 180 °C and 8 h with subsequent calcination of the sample at 500 °C for 1 h. The results of the present study can be useful to enhance the properties of α-Fe2O3 nanostructures in various fields of application.

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Influence of calcination on the morphology and crystallinity of titanium dioxide nanofibers towards enhancing photocatalytic dye degradation

Cited by 13 publications

References 74 publications

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

The impact of Au nanoparticles and lanthanide-doped NaYF4 on the photocatalytic activity of titania photocatalyst

Nanostructured α-Fe2O3: Solvothermal Synthesis, Characterization, and Effect of Synthesis Parameters on Structural Properties

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