Effect on the stabilization of the anatase phase and luminescent properties of samarium-doped TiO2 nanocrystals prepared by microwave irradiation

Dominguez, Rafael; Alarcón-Flores, G.; Aguilar-Frutis, M.; Alarcón, Raúl Iván Sánchez; Falcony, C.; Dorantes-Rosales, Héctor J.; González-Velázquez, Jorge Luis; Rivas-López, Diego I.

doi:10.1016/j.jallcom.2016.06.083

Cited by 17 publications

(3 citation statements)

References 74 publications

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“…To prepare powders with defined nanostructures are electrospinning (nanofibers) [38], anodization (nanotubes) [39], microemulsion (spheres) [40], hydrothermal (nanowires) [41], state solid reaction (amorphous) [42], impregnation (amorphous) [43], and sol-gel (different structures) [44]. All of them can be modified, combined with each other or coupled to different energy sources, such as microwaves [45] and ultrasounds [46], to create doped materials with unique photocatalytic properties.…”

Section: Methods Of Synthesis Of Tio 2 -Rementioning

confidence: 99%

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Pérez¹,

Torres²,

Romero³

et al. 2019

Water and Wastewater Treatment

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Rare earth doping ions can improve the spectral response of this semiconductor to the visible region. This work evaluated the dopant effect of rare earth ions such as La, Ce, Nd, Pr, Sm, Eu, and Gd in titania for the solar photodegradation of Diuron and methyl parathion. The increase in the content up to 0.5% of dopants decreases photoactivity due to the formation of photo-generated electron-hole pair recombination centers. The catalysts calcined at 500°C presented only the anatase crystalline phase and the samples doped with La and Ce at 0.1 and 0.3% were the most active in diuron solar degradation; however, when the temperature of the thermal treatment increased to 800°C, mixtures of crystalline phases were presented. The catalyst with the highest anatase content showed the best performance. The materials calcined at 500°C with better performance in diuron solar degradation were selected to to treat methyl parathion using solar light. Finally, under these conditions, an affinity was found for the dopant ions in titania and in the functional groups of the contaminating molecules (phenylurea and thiophosphate). Solar photodegradation of diuron was more effective with La and Ce, while for methyl parathion, it was Eu at 0.3%.

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Section: Methods Of Synthesis Of Tio 2 -Rementioning

confidence: 99%

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Pérez¹,

Torres²,

Romero³

et al. 2019

Water and Wastewater Treatment

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“…In recent years, the modification with rare earth (RE) metals has proven to be an efficient method to improve the photocatalytic properties of TiO 2 and to broaden its absorption to the solar spectrum [ 8 , 11 – 12 ]. Various Lewis bases can form complexes with RE-modified TiO 2 , which leads to enhanced surface adsorption properties of TiO 2 and indirectly increases the photocatalytic activity of the photocatalysts [ 13 – 14 ]. Moreover, it has been reported that the presence of RE ions slowed down the rate of the charge-carrier recombination processes [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO₂

Parnicka

Mazierski

Grzyb

et al. 2018

Beilstein J. Nanotechnol.

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Nd-modified TiO2 photocatalysts have been obtained via hydrothermal (HT) and sol–hydrothermal (SHT) methods. The as-prepared samples were characterized by X-ray diffraction (XRD), BET surface area measurements, scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), luminescence spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the synthesized samples was evaluated by the degradation of phenol in aqueous solution under irradiation with UV–vis (λ > 350 nm) and vis (λ > 420 nm) light, as well as by the degradation of gaseous toluene under irradiation with vis (λmax = 415 nm) light. It was found that Nd-modified TiO2 is an efficient photocatalyst for the degradation of phenol and toluene under visible light. XPS analysis revealed that the photocatalyst prepared via HT method contains a three-times higher amount of hydroxy groups at the surface layer and a two-times higher amount of surface defects than that obtained by the SHT method. The photocatalytic efficiency of phenol and toluene degradation under vis irradiation in the presence of 0.25% Nd-TiO2(HT) reached 0.62 and 3.36 μmol·dm−1·min−1, respectively. Photocatalytic activity tests in the presence of Nd-TiO2 and scavenger confirm that superoxide radicals were responsible for the visible light-induced degradation of the model pollutant in aqueous solution.

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“…Rare earth elements from La to Lu possess ionic radii comparable to Ca 2+ making such replacement much easier [22,23,24]. In addition, the incorporation of rare earth elements, particularly samarium, into the FAp structure increases wide ranging catalytic properties [25,26,27,28]. The catalytic efficiency of FAp also relies on its physical features.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Samarium Doped Fluorapatites and Their Catalytic Activity towards Synthesis of 1,2,4-Triazoles

2016

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An investigation was conducted into the influence of the amino acids as organic modifiers in the facile synthesis of metal incorporated fluorapatites (FAp) and their properties. The nanostructured Sm doped fluorapatites (Sm-FAp) were prepared by a co-precipitation method using four different amino acids, namely glutamic acid, aspartic acid, glycine and histidine. The materials were characterized by various techniques including X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), high resolution transmission electron microscopy (HR-TEM), N 2 -adsorption/desorption isotherm, temperature programmed desorption (TPD) and fluorescence spectrophotometry. Under similar conditions, Sm-FAp prepared using different amino acids exhibited distinctly different morphological structures, surface area and pore properties. Their activity as catalysts was assessed and Sm-FAp/Glycine displayed excellent efficiency in the synthesis of 1,2,4-triazole catalyzing the reaction between 2-nitrobenzaldehyde and thiosemicarbazide with exceptional selectivity and 98% yield in a short time interval (10 min). The study provides an insight into the role of organic modifiers as controllers of nucleation, growth and aggregation which significantly influence the nature and activity of the catalytic sites on Sm-FAp. Sm-FAp could also have potential as photoactive material.

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Effect on the stabilization of the anatase phase and luminescent properties of samarium-doped TiO2 nanocrystals prepared by microwave irradiation

Cited by 17 publications

References 74 publications

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO₂

Nanostructured Samarium Doped Fluorapatites and Their Catalytic Activity towards Synthesis of 1,2,4-Triazoles

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Effect on the stabilization of the anatase phase and luminescent properties of samarium-doped TiO2 nanocrystals prepared by microwave irradiation

Cited by 17 publications

References 74 publications

Photocatalytic Treatment of Pesticides Using TiO2 Doped with Rare Earth

Photocatalytic Treatment of Pesticides Using TiO2 Doped with Rare Earth

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO2

Nanostructured Samarium Doped Fluorapatites and Their Catalytic Activity towards Synthesis of 1,2,4-Triazoles

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Product

Resources

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Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO₂