Annealing Control on the Anatase/Rutile Ratio of Nanostructured Titanium Dioxide Obtained by Sol-Gel

Castrejón-Sánchez, V.H.; López, Ronald Campos; Ramón-González, M.; Enríquez-Pérez, Ángeles; Camacho-López, M.A.; Villa-Sánchez, Gerardo

doi:10.3390/cryst9010022

Cited by 32 publications

(21 citation statements)

References 36 publications

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“…Figure 3 shows the Raman spectra of the (a) TiO 2 and (b) TiO 2 /Graphene samples. As it can be seen, the principal signals of anatase TiO 2 phase at 152, 400, 526 and 636 cm −1 are present in all the spectra [21]. Notice that in the range of 240-350 cm −1 low intensity signals can be observed, the small bands centered at 245 and 322 cm −1 (marked with * in figure 3) are characteristic of brookite TiO 2 [15], which further confirms the mixture of anatase and brookite phases observed by XRD measurements.…”

Section: Resultsmentioning

confidence: 62%

UV and Visible light photodegradation of methylene blue with graphene decorated titanium dioxide

Acosta-Esparza

Rivera

Pérez-Centeno

et al. 2020

Mater. Res. Express

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Photocatalytic degradation of methylene blue by graphene decorated titanium dioxide (TiO 2 ) powders heated at different temperatures was analyzed. The powders were prepared by mixing TiO 2 with graphene prepared by the modified Hummers method. A thermal treatment was applied to mixed and pure TiO 2 powders with the aim of analyze their structural dependence on temperature, and consistently their photocatalytic degradation effect on methylene blue solutions exposed to UV and visible radiation. Structural characterization of the powders was carried out by x-ray diffraction and Raman spectroscopy. When irradiated with UV, the mixed powders showed as high as 87% photocatalytic degradation, while the pure TiO 2 reached values of 59%. For visible radiation, as it is expected, the pure TiO 2 showed no activity, while the mixture presented degradation of 40%.

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Section: Resultsmentioning

confidence: 62%

UV and Visible light photodegradation of methylene blue with graphene decorated titanium dioxide

Acosta-Esparza

Rivera

Pérez-Centeno

et al. 2020

Mater. Res. Express

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“…The different band gap energies of TiO 2 were caused by their different crystallographic compositions, that is, the content of anatase and rutile. The band gap energies of pure anatase and rutile are reported in the literature as 3.2 eV and 3.0 eV, respectively [36]. The E g value of CG300 (3.25 eV) implies the presence of only anatase in CG300.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Degradation of Selected Pharmaceuticals Using g-C3N4 and TiO2 Nanomaterials

et al. 2019

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Exfoliated graphitic carbon nitride (g-C3N4) and two commercially available nanomaterials from titanium dioxide (P25 and CG300) were tested for the photocatalytic degradation of paracetamol (PAR), ibuprofen (IBU), and diclofenac (DIC). Prior to photocatalytic experiments, the nanomaterials were characterized by common methods, such as X-ray diffraction (XRD), UV–VIS diffuse reflectance spectroscopy (DRS), Fourier transformed infrared spectroscopy in attenuated total reflection mode (FTIR–ATR), transmission electron microscopy (TEM), physisorption of nitrogen, and dynamic vapor adsorption (DVS) of water. The sizes and specific surface area (SSA) of the TiO2 nanoparticles were 6 nm and 300 m2·g−1 for CG300 and 21 nm and 50 m2·g−1 for P25. The SSA of g-C3N4 was 140 m2·g−1. All photocatalytic experiments were performed under UV (368 nm), as well as VIS (446 nm) irradiation. TiO2 P25 was the most active photocatalyst under UV irradiation and g-C3N4 was the most active one under VIS irradiation. Photodegradation yields were evaluated by means of high performance liquid chromatography (HPLC) and reaction intermediates were identified using gas chromatography with mass detection (GC–MS). Paracetamol and ibuprofen were totally removed but the intermediates of diclofenac were observed even after 6 h of irradiation. Some intermediates, such as carbazole-1-acetic acid, 2,6-dichloraniline, and hydroxylated derivates of diclofenac were identified. This study showed that g-C3N4 is a promising photocatalyst for the degradation of pharmaceuticals in an aqueous environment, under visible light.

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“…Supported TiO 2 nanotubes were prepared by anodization of a titanium mesh followed by a temperature controlled annealing to acquire anatase phase, which is the most desired crystalline morphology of TiO 2 for photocatalytic applications [52]. The titanium mesh was first degreased by sonication in an acetone/methanol solution for 30 min.…”

Section: Anodization Of Titanium Meshmentioning

confidence: 99%

Comparative Study of Four TiO2-Based Photocatalysts to Degrade 2,4-D in a Semi-Passive System

Heydari

Hollman

Achari

et al. 2019

Water

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In this study, the relative efficiency of four forms of supported titanium dioxide (TiO2) as a photocatalyst to degrade 2,4-dichlorophenoxyacetic acid (2,4-D) in Killex®, a commercially available herbicide was studied. Coated glass spheres, anodized plate, anodized mesh, and electro-photocatalysis using the anodized mesh were evaluated under an ultraviolet – light-emitting diode (UV-LED) light source at λ = 365 nm in a semi-passive mode. Energy consumption of the system was used to compare the efficiency of the photocatalysts. The results showed both photospheres and mesh consumed approximately 80 J/cm3 energy followed by electro-photocatalysis (112.2 J/cm3), and the anodized plate (114.5 J/cm3). Although electro-photocatalysis showed the fastest degradation rate (K = 5.04 mg L−1 h−1), its energy consumption was at the same level as the anodized plate with a lower degradation rate constant of 3.07 mg L−1 h−1. The results demonstrated that three-dimensional nanotubes of TiO2 surrounding the mesh provide superior degradation compared to one-dimensional arrays on the planar surface of the anodized plate. With limited broad-scale comparative studies between varieties of different TiO2 supports, this study provides a comparative analysis of relative degradation efficiencies between the four photocatalytic configurations.

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Annealing Control on the Anatase/Rutile Ratio of Nanostructured Titanium Dioxide Obtained by Sol-Gel

Cited by 32 publications

References 36 publications

UV and Visible light photodegradation of methylene blue with graphene decorated titanium dioxide

UV and Visible light photodegradation of methylene blue with graphene decorated titanium dioxide

Photocatalytic Degradation of Selected Pharmaceuticals Using g-C3N4 and TiO2 Nanomaterials

Comparative Study of Four TiO2-Based Photocatalysts to Degrade 2,4-D in a Semi-Passive System

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