The effect of electric transport properties of titanium dioxide nanostructures on their photocatalytic activity

Сериков, Т. М.

doi:10.31489/2020ph3/13-21

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…Advances on Photocatalytic CO2 Reduction Based on CdS and CdSe Nano-Semiconductors. ACTA PHYSICO-CHIMICA SINICA, 37 (5).…”

Section: Discussionmentioning

confidence: 99%

“…Titanium dioxide (TiO2) is a promising semiconductor material in photocatalysis due to its optical, structural, electrical characteristics, high chemical stability, low toxicity, low cost and high photocatalytic activity [1][2][3][4]. Among the variety of TiO2 nanostructures, such as nanoparticles, nanostitches, nanotubes and nanothreads, materials with one-dimensional transport of charge carriers are more promising [5]. One of these is titanium dioxide nanorod (TNR), obtained by hydrothermal synthesis.…”

Section: Introductionmentioning

confidence: 99%

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Effect of TNR/Ag/rGO film area on its photocatalytic activity

Kayumova,

Savilov,

Zhanbirbayeva

et al. 2023

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This paper presents the results of a study of the effect of the area of nanocomposite films formed by titanium dioxide nanorods, silver nanoparticles and reduced graphene oxide (TNR/Ag/rGO) on its photocatalytic activity. The active area of the nanocomposite films was S=1cm2, S=1.5cm2, S=2cm2, S=3cm2. The photocatalytic activity of the samples was assessed by the value of the generated photocurrent per unit surface of the film and the photodegradation of the methylene blue dye when the surface was illuminated with a light source from a xenon lamp (300 W). A film with an area of 1 cm2 generated 0.00042 A/cm2. With increasing film area S=1.5 cm2, S=2cm2, S=3cm2, the photocurrent density was 0.00035 A/cm2, 0.00028 A/cm2, 0.00013 A/cm2, respectively. It was found that in the absence of a nanocomposite film, the degradation of the dye is negligible. When the TNR/Ag/rGO film was immersed in a dye solution, the degradation of the dye increased and amounted to 32, 59, 70 and 81 % for S=1cm2, S=1.5 cm2, S=2cm2, S=3cm2 with an irradiation duration of 240 minutes. The results obtained suggested that as the active surface area of the films increases, their photocatalytic activity decreases. The decrease in photocatalytic activity is associated with surface defects and an increase in film resistance.

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“…Advances on Photocatalytic CO2 Reduction Based on CdS and CdSe Nano-Semiconductors. ACTA PHYSICO-CHIMICA SINICA, 37 (5).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of TNR/Ag/rGO film area on its photocatalytic activity

Kayumova,

Savilov,

Zhanbirbayeva

et al. 2023

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“…After 5 minutes of deposition, the films were removed and washed several times with deionized water. The deposition time is optimal, at which the maximum photocatalytic activity of the samples is observed [11,12].…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic activity of the TIO2/Ag/rGO nanocomposite

Serikov¹,

Zhanbirbayeva²,

Baltabekov³

et al. 2022

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The paper presents the results of a study of the photocatalytic activity of films formed by titanium dioxide nanorods doped with silver nanoparticles and reduced graphene oxide. The obtained nanocomposite materials were studied by optical spectroscopy, scanning electron microscopy, X-ray diffractometry, and Raman spectroscopy. The photocatalytic activity of the samples was evaluated by generating a photocurrent when the surface was illuminated by a modulated light source of a xenon lamp. In addition, the photocatalytic activity of the samples was evaluated by the degradation of the methylene blue dye, which is a model. It was found that the introduction of silver nanoparticles and reduced graphene oxide into the pores of films made of titanium dioxide nanorods leads to an increase in the spectral sensitivity of the sample in the region of 400-500 nm. The increased sensitivity of the sample to visible light leads to an increase in photocurrent generation and is 2.3 times higher than that of the original sample. Degradation of the methylene blue dye after 100 minutes of irradiation in the presence of a TiO2/Ag/rGO sample was 19 %. This is 3 times higher than in TiO2 nanorods films and 2.3 times higher than TiO2/Ag films. The results of the conducted studies have shown that the improvement of photocatalytic activity is associated with a decrease in film resistance, an expansion of spectral sensitivity and an increase in the surface area of the nanorods.

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“…In addition, hydrogen is also applicable as a raw material in the modern chemical industry [2]. Photocatalytic reactions are suitable in other applications, for example, for the decomposition of organic pollutants [3][4][5][6], water purification [7] and reduction of carbon dioxide [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Titanium dioxide and nanostructures based on it is one of the attractive photocatalysts. Due to their physicochemical properties, TiO 2 nanostructures possess significant advantage as photocatalyst over many semiconductors [3][4][5][6][7]. However, it has some limitations.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic effect of metal nanoparticles on the photocatalytic properties of TiO₂/rGO composite

Seliverstova,

Serikov,

Nuraje

et al. 2024

Nanotechnology

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In this work, the plasmonic effect of Au and Ag nanoparticles in the heterostructure photocatalyst system (TiO2/rGO) was studied. The laser ablation approach was applied to synthesize Au and Ag nanoparticles to eliminate impurity influence in this plasmonic study. Characterizing tools such as SEM, TEM, XRD, Raman, UV–vis spectral techniques were applied to obtain morphological information and optical properties of the nanocomposites. Photocatalytic properties of ternary nanocomposities such as, TiO2/rGO/Ag and TiO2/rGO/Au, were evaluated against Methylene blue and Congo red dyes with changing concentration of plasmonic nanoparticles (Au and Ag) and it was founded that the nanocomposite with the concentration of 10–11 mol/L Au NPs in TiO2/rGO has the best photocatalytic activity. EIS study indicated that a significant decrease in resistance Rp (109 Ohms) was observed for TiO2/rGO at 10-11 mol/Lconcentration of Au and its lifetimes is 0.0118 s, supporting that TiO2/rGO/Au has the best photocatalytic activity at 10–11 mol/L Au in the TiO2/rGO nanocomposites.

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The effect of electric transport properties of titanium dioxide nanostructures on their photocatalytic activity

Cited by 4 publications

References 3 publications

Effect of TNR/Ag/rGO film area on its photocatalytic activity

Effect of TNR/Ag/rGO film area on its photocatalytic activity

Photocatalytic activity of the TIO2/Ag/rGO nanocomposite

Plasmonic effect of metal nanoparticles on the photocatalytic properties of TiO₂/rGO composite

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The effect of electric transport properties of titanium dioxide nanostructures on their photocatalytic activity

Cited by 4 publications

References 3 publications

Effect of TNR/Ag/rGO film area on its photocatalytic activity

Effect of TNR/Ag/rGO film area on its photocatalytic activity

Photocatalytic activity of the TIO2/Ag/rGO nanocomposite

Plasmonic effect of metal nanoparticles on the photocatalytic properties of TiO2/rGO composite

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Product

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Plasmonic effect of metal nanoparticles on the photocatalytic properties of TiO₂/rGO composite