Study of the preparation of TiO<sub>2</sub> powder by different synthesis methods

Sánchez-Martínez, A.; Koop-Santa, C.; Ceballos-Sánchez, O.; López-Mena, Edgar R.; González, Marco Aurélio Stumpf; Rangel-Cobián, V; Orozco-Guareño, Eulogio; García-Guaderrama, M.

doi:10.1088/2053-1591/ab21e8

Cited by 15 publications

(16 citation statements)

References 56 publications

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“…Various fabrication methods have been performed to synthesis TiO2 NPs such as sol-gel [28,29], microemuolsion, reverse micells [30][31][32][33], Co-precipitation [34,35], pyrolysis [36,37], laser ablation [38,39], chemical vapor deposition [40,41], physical vapor deposition [42,43], solvo-thermal [44,45], electrochemical deposition [46,47], mechano-chemical [48,49], combustion [50,51], sono-chemical microwave [52,53] and hydrothermal [54,55]. Among of them, the hydrothermal method possesses more benefits such as cheap cost, controllable in synthesis, productive, no needing thermal operation and low pollutions [56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Methylene Blue and Evans Blue by Iron and Sulphur Doped TiO2 Nanophotocatalyst under Ultraviolet and Visible Light Irradiation

2021

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Abstract. This research firstly aims to fabricate and characterize doped TiO2 nanoparticles (NPs) by iron and Sulphur dopants, and then the determination of the photocatalytic activity of NPs. Titanium tetraisopropoxide (TTIP), iron trichloride hexahydrate, thiouria, glacial acetic are utilized as precursors in the hydrothermal method without using a template or surfactant. The synthesized NPs are investigated by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), N2 adsorption-desorption, UV-Vis spectroscopy, UV-Vis diffuse reflectance spectroscopy (DRS) and Fourier transform infrared (FT-IR). The lattice constants, strain, stress, deformation energy density and crystallite size are investigated using Williamson-Hall (W-H) and Wagner-Halder (W-H) models by considering the different isotropic nature of the crystalline lattice. The X-ray analysis indicates the tetragonal anatase phase without dopant crystalline phases. The FE-SEM and TEM images reveal a granular shape of NPs with a mean diameter of about 35 nm. Decoloration or photodegradation of organic dyes such as methylene blue (MB) and Evans Blue (EV) under UV-Vis irradiation is a method to measure the photocatalytic activity of doped TiO2 NPs. The results indicate the significant effect of dopants on the photocatalytic activity of doped TiO2 NPs, so that in comparison with other studies, it has a higher performance and removal efficiency. The bandgap of NPs is estimated from the Kubelka-Munk theory to be 2.87 eV. Resumen. Esta investigación tiene como objetivo fabricar y caracterizar nanopartículas de TiO2 (NP) dopadas con hierro y azufre, y la actividad fotocatalítica de las NP. El tetraisopropóxido de titanio (TTIP), el tricloruro de hierro hexahidratado, la tiouria, el acético glacial fueron los precursores en la síntesi según el método hidrotermal y no se utilizó una plantilla o tensioactivo. Las NP sintetizadas se caracterizaron por difracción de rayos X (XRD), microscopía electrónica de emisión de campo (FE-SEM), espectroscopía de rayos X de dispersión de energía (EDX), microscopía electrónica de transmisión (TEM), adsorción-desorción de N2, espectroscopías UV-Vis, de reflectancia difusa UV-Vis (DRS) e infrarroja por transformada de Fourier (FT-IR). Las constantes de red, deformación, tensión, densidad de energía de deformación y tamaño de cristal se investigan utilizando modelos de Williamson-Hall (W-H) y Wagner-Halder (W-H), considerando la diferente naturaleza isotrópica de la red cristalina. El análisis de difracción de rayos X indica la fase anatasa tetragonal sin fases cristalinas dopantes. Las imágenes FE-SEM y TEM revelan una forma granular de las NP, con un diámetro promedio de aproximadamente 35 nm. La decoloración o fotodegradación de tintes orgánicos como el azul de metileno (MB) y el azul de Evans (EV) bajo irradiación UV-Vis es un método para medir la actividad fotocatalítica de las NP de TiO2 dopadas. Los resultados indican un efecto significativo de los dopantes sobre la actividad fotocatalítica de las NP de TiO2 dopadas, que, en comparación con otros estudios, tiene un mayor rendimiento y eficiencia de eliminación. La bandgap de las NP se estimó en 2.87 eV, a partir de la teoría de Kubelka-Munk.

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Section: Introductionmentioning

confidence: 99%

Photodegradation of Methylene Blue and Evans Blue by Iron and Sulphur Doped TiO2 Nanophotocatalyst under Ultraviolet and Visible Light Irradiation

2021

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“…Dodd et al [34] [35]. Also TiO 2 nanoparticles were prepared using solid-state methods [36,37], however it was not possible to isolate the anatase phase.…”

Section: Introductionmentioning

confidence: 99%

Insights of the formation mechanism of nanostructured titanium oxide polymorphs from different macromolecular metal-complex precursors

Allende

Orera

Laguna‐Bercero

et al. 2021

Heliyon

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The insight into the mechanism of the unprecedented formation of pure anatase TiO 2 from the macromolecular (Chitosan)(TiOSO 4 ) n precursor has been investigated using micro Raman spectroscopy, Scanning Electron Microscopy (SEM) and thermogravimetric/differential thermal analysis (TGA/DTA). The formation of a graphitic film was observed upon annealing of the macromolecular precursor, reaching a maximum at about 500 C due to decomposition of the polymeric chain of the Chitosan and (PS-co-4-PVP) polymers. The proposed mechanism is the nucleation and growth of TiO 2 nanoparticles over this graphitic substrate. SEM and Raman measurements confirm the formation of TiO 2 anatase around 400 C. The observation of an exothermic peak around 260 C in the TGA/DTA measurements confirms the decomposition of carbon chains to form graphite. Another exothermic peak around 560 C corresponds to the loss of additional carbonaceous residues.

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“…Moreover, the functional properties of titania are highly dependent on its morphology [28,29]. Hence, employing an appropriate method is crucial to synthesize each of the abovementioned crystalline forms selectively [30,31].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Synthesis Parameters of Nanoporous Titania Particles to Improve Structural Properties and Photocatalytic Activity

Hassankhani-Majd

Anbia

2021

Preprint

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Nanoporous materials have been widely used in many fields. However, their synthesis with uniform particle shapes, pore sizes, pore volumes, and surface areas remains a considerable challenge. Thus, choosing a suitable controllable method for synthesizing nanoporous materials is crucial to obtain appropriate properties. Herein, nanoporous titania particles (NPTPs) were prepared via the hydrothermal. This study investigated how the synthesis parameters such as the type of chelating agent, the hydrolysis method, and the drying technique affected the properties of NPTPs. The synthesis NPTPs were characterized by XRD, FESEM, and BET. The results demonstrated that when acetylacetone (ACAC) (as the chelating agent), the spray-hydrolysis (SH) method, and the freeze-drying (FD) technique were used, NPTPs achieved a more uniform particle shape, a smaller particle size, a larger pore size, a larger pore volume, and a higher surface area. Ultimately, the photocatalytic degradation (PCD) of methylene blue (MB) was examined using improved NPTPs.

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Study of the preparation of TiO₂ powder by different synthesis methods

Cited by 15 publications

References 56 publications

Photodegradation of Methylene Blue and Evans Blue by Iron and Sulphur Doped TiO2 Nanophotocatalyst under Ultraviolet and Visible Light Irradiation

Photodegradation of Methylene Blue and Evans Blue by Iron and Sulphur Doped TiO2 Nanophotocatalyst under Ultraviolet and Visible Light Irradiation

Insights of the formation mechanism of nanostructured titanium oxide polymorphs from different macromolecular metal-complex precursors

Comparative Study of Synthesis Parameters of Nanoporous Titania Particles to Improve Structural Properties and Photocatalytic Activity

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Study of the preparation of TiO2 powder by different synthesis methods

Cited by 15 publications

References 56 publications

Photodegradation of Methylene Blue and Evans Blue by Iron and Sulphur Doped TiO2 Nanophotocatalyst under Ultraviolet and Visible Light Irradiation

Photodegradation of Methylene Blue and Evans Blue by Iron and Sulphur Doped TiO2 Nanophotocatalyst under Ultraviolet and Visible Light Irradiation

Insights of the formation mechanism of nanostructured titanium oxide polymorphs from different macromolecular metal-complex precursors

Comparative Study of Synthesis Parameters of Nanoporous Titania Particles to Improve Structural Properties and Photocatalytic Activity

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Study of the preparation of TiO₂ powder by different synthesis methods