Effect of phase composition on the photocatalytic activity of titanium dioxide obtained from supercritical antisolvent

Silva, Elisângela P. da; Winkler, Manuel E.G.; Giufrida, Willyan Machado; Cardozo‐Filho, Lúcio; Alonso, Christian Gonçalves; Lopes, Jardel B.O.; Rubira, Adley F.; Silva, Rafael

doi:10.1016/j.jcis.2018.09.098

Cited by 28 publications

(15 citation statements)

References 49 publications

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“…Anatase has been reported to have a band gap about 3.2 eV. The lowest energy band gap of TiO 2 -800 composed of only the rutile phase is 3.05 eV and well correlated with the report of Da Silva et al [20] who also found the energy band gap of the rutile phase was 3.05 eV.…”

Section: Resultssupporting

confidence: 83%

“…There are many synthesis methods such as hydrothermal [18], microwave [19], supercritical antisolvent [20], and sol-gel [21] methods for preparation of TiO 2 nanoparticles. Hydrothermal, microwave, and supercritical antisolvents provided high purity and high surface equipment for TiO 2 synthesis, whereas the sol-gel method can be undertaken at atmospheric pressure and room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Calcination Temperature on Photocatalytic Activity of Synthesized TiO2 Nanoparticles via Wet Ball Milling Sol-Gel Method

et al. 2020

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In this work, TiO2 nanoparticles were successfully synthesized with narrow size distribution via a wet ball milling sol-gel method. The effect of calcination temperature on photocatalytic activity was observed from particle size, crystallite size, and phase transition of TiO2 nanoparticles. Increasing calcination temperature increased particle size, crystallite size, and the crystallinity of synthesized TiO2. Phase transition depended on variation in calcination temperatures. A two-phase mixture of anatase and brookite was obtained with lower calcination temperature whereas a three-phase mixture appeared when calcination temperature was 500–600 °C. With higher temperature, the rutile phase kept increasing until it was the only phase observed at 800 °C. Anatase strongly affected the photocatalytic activity from 300 °C to 600 °C while the particle size of TiO2 was found to have a dominant effect on the photocatalytic activity between 600 °C and 700 °C. A mixture of three phases of TiO2-600 exhibited the highest methylene blue degradation with the rate constant of 9.46 × 10−2 h−1 under ultraviolet (UV) irradiation.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effect of Calcination Temperature on Photocatalytic Activity of Synthesized TiO2 Nanoparticles via Wet Ball Milling Sol-Gel Method

et al. 2020

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“…It is worthwhile to note that, as far as we know, only two papers were focused on the preparation by SAS process of TiO 2 to be used as photocatalyst [37,38]. Therefore, the effectiveness of SAS precipitation for photocatalytic applications is still unexplored.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

et al. 2019

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In this work, the synthesis of zinc oxide (ZnO) photocatalyst from thermal decomposition of zinc acetate (ZnAc) nanoparticles obtained by supercritical antisolvent (SAS) precipitation was investigated. The optimization of calcination conditions of the SAS ZnAc was carried out, studying the effect of temperature (in the range 300–600 °C) on the production of ZnO nanoparticles. In particular, it was demonstrated that the organic residues in ZnO and its particle size, thus the specific surface area, strongly affect the photocatalytic performances. SAS micronization of ZnAc produces regular nanoparticles with a mean diameter of about 54.5 ± 11.5 nm, whereas unprocessed ZnAc is characterized by very large crystals. The experimental results evidenced that ZnAc prepared by SAS process calcined at 500 °C showed a regular nanometric structure (mean diameter: 65.0 ± 14.5 nm) and was revealed to be the best choice for the photocatalytic removal of crystal violet dye (CV). In fact, the photocatalytic activity performances of ZnO nanoparticles prepared by this route were higher with respect to that of ZnO from unprocessed ZnAc calcined at 500 °C (which is characterized by irregular tetrapods with mean size 181.1 ± 65.5 nm). The optimized photocatalyst was able to assure the complete CV decolorization in 60 min of UV irradiation time and a mineralization degree higher than 90% after 120 min of treatment time.

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“…Among them, semiconductor heterogeneous photocatalysis has enormous potential to treat organic contaminants, having gained growing acceptance as an effective wastewater treatment method to degrade a broad variety of harmful compounds. Although a wide variety of semiconductors have been reported to be effective photocatalysts [4][5][6][7][8][9][10][11][12][13], TiO 2 is still the most widely used semiconductor in photocatalysis because it is a cost effective non-toxic compound, chemically and biologically inert, thermally stable, superhydrophilic, and capable of promoting the oxidation of numerous organic compounds [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

et al. 2019

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TiO 2 and TM-doped TiO 2 (TM = Re, Ru) anatase crystalline nanopowders were synthesized by a simple hydrothermal method. Samples with nominal TM/Ti ratio of 0.01 were prepared for this study. Their structural, microstructural and optical properties were studied. The lattice parameters of the different prepared samples were calculated and their mean crystallite sizes determined to be in the range 15-7 nm, the lower values being obtained for the doped crystallites. The samples' specific surface areas were determined and correlated with their mean crystallite sizes. The incorporation of the dopant elements results in an increase of the optical absorption in the visible range. The samples' optical bandgap and Urbach energies were calculated from UV-Vis diffuse reflectance spectra. The photocatalytic behavior of the synthesized samples was investigated for the rhodamine B and phenol degradation processes, the kinetics of the different photo-oxidation reactions being also studied. The results showed that doping either with Re or Ru can lead to enhancement of the TiO 2 photocatalytic efficiency and that, among the synthesized samples Ru-doped TiO 2 is the most efficient photocatalyst for both the Rhodamine B and phenol photodegradation reactions.

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Effect of phase composition on the photocatalytic activity of titanium dioxide obtained from supercritical antisolvent

Cited by 28 publications

References 49 publications

Effect of Calcination Temperature on Photocatalytic Activity of Synthesized TiO2 Nanoparticles via Wet Ball Milling Sol-Gel Method

Effect of Calcination Temperature on Photocatalytic Activity of Synthesized TiO2 Nanoparticles via Wet Ball Milling Sol-Gel Method

Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

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