Optical and photo catalytic characteristics of Ag2S/TiO2 nanocomposite films prepared by electrochemical anodizing and SILAR approach

Momeni, Mohamad Mohsen; Ghayeb, Yousef; Mozafari, A. A.

doi:10.1007/s10854-016-5240-8

Cited by 33 publications

(11 citation statements)

References 37 publications

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“…To improve the utilization efficiency of sunlight radiation and also to enhance the photocatalytic activity, fresh visible-light-driven photocatalysts with high photocatalytic activity and stability has to be designed [7, 8, 9, 10, 11]. Through a variety of reports exist in the literature on visible light photocatalysis [12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23], certain materials are more responsive to both UV and visible light. Among them, BiFeO 3 (BFO) is a well-familiar and an important semiconductor photocatalyst because of its huge response to solar radiation, band gap and high stability [24, 25, 26, 27].…”

Section: Introductionmentioning

confidence: 99%

Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst

Subramanian

Ramasamy

Karthikeyan

et al. 2019

Heliyon

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Perovskite types of nanocomposites of BiFeO 3 –GdFeO 3 (BFO-GFO) has been synthesized using sol-gel route for the first time. The nanocomposite powders were characterized by powder X-Ray diffraction (PXRD) to confirm the existence of mixed crystallographic phases. EDX analysis on nanocomposites estimates the composition of individual element present in BFO-GFO matrix. The induced strain upon loading GdFeO 3 (GFO) in BiFeO 3 (BFO) matrix has been computed with the aid of Williamson –Hall (W–H) plot. Surface morphologies of nanocomposite powders has been studied using Field Emission Scanning Electron Microscope ( FESEM) images. The observed changes in the band gap energies of nanocomposite powders due to the inclusion of GFO has been ascertained from the tauc plots. PL emission of BFO upon loading GFO found to have detected in the IR region due to defect level transition. Finally, the methylene blue dye (MB) degradation characteristics of BFO, GFO and the nanocomposite powders of BFO-GFO have also been studied. The overall results obtained has been discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst

Subramanian

Ramasamy

Karthikeyan

et al. 2019

Heliyon

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“…The doping of TiO 2 with transition metals can introduce electron capture centres that result in a decrease of electron–hole recombination centres . The photocatalytic activity of TiO 2 and TiO 2 ‐SiO 2 photocatalysts is improved if Pt, Pd, Au or Ag are used as dopants or if Pt, Pd, Au or Ag are deposited on TiO 2 but these metals are rare and expensive. Cu is a good candidate to replace expensive metals as a dopant.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

et al. 2018

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The objective of this research is to examine how Cu modification can improve the photocatalytic activity of TiO2‐SiO2, to explain the correlation between the Cu concentration and the chemical state of Cu cations in the TiO2‐SiO2 matrix, and the photocatalytic activity under UV/solar irradiation. The Cu‐modified TiO2‐SiO2 photocatalysts were prepared by a low‐temperature sol–gel method from organic Cu, Si and Ti precursors with various Cu concentrations (0.05–3 mol %). The sol–gels were dried at 150 °C to obtain the photocatalysts in a powder form. The photocatalytic activity was determined by using a fluorescence‐based method of terephthalic acid decomposition. An up to three times increase in photocatalytic activity is obtained if the TiO2‐SiO2 matrix is modified with Cu in a narrow concentration range from 0.05 to 0.1 mol %. At higher Cu loadings, the photocatalytic activity of the Cu‐modified photocatalysts is lower than that of the un‐modified reference TiO2‐SiO2 photocatalyst. XRD was used to show that all Cu‐modified TiO2‐SiO2 composites with different Cu concentrations have the same crystalline structure as un‐modified TiO2‐SiO2 composites. The addition of Cu does not change the relative ratio between the anatase and brookite phases or unit cell parameters of the two TiO2 crystalline structures. We used Cu K‐edge X‐ray absorption near edge structure and extended X‐ray absorption fine structure analyses to determine the valence state and local structure of Cu cations in the Cu‐modified TiO2‐SiO2 photocatalysts. The results elucidate the mechanism responsible for the improved photocatalytic activity. In samples with a low Cu content, which exhibit the highest activity, Cu−O−Ti connections are formed, which suggests that the activity enhancement is caused by the attachment of CuII cations on the surface of the photocatalytically active TiO2 nanoparticles, so CuII cations may act as free‐electron traps, which reduce the intensity of recombination between electrons and holes at the TiO2 photocatalyst surface. At higher Cu loadings no additional Cu−O−Ti connections are formed, instead only Cu−O−Cu connections are established. This indicates the formation of amorphous or nanocrystalline copper oxide, which hinders the photocatalytic activity of TiO2.

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“…Different evaluations of photocatalytic ability under visible light demonstrated the superior photocatalytic ability of C-TiO2 materials compared to unmodified materials. Momeni et al (2016aMomeni et al ( , 2016b) reported fabrication of nitrogen, carbon, and iron multiple-codoped titanium dioxide nanotubes by depositing method on TiO2 nanotube surface as a new high-performance photocatalyst. At the same time, these authors also synthesized the photocatalytic nanocomposite films of Ag2S/TiO2 by electrochemical anodizing and successive ionic layer adsorption and reaction approach (Momeni et al 2016a(Momeni et al , 2016b.…”

Section: Introductionmentioning

confidence: 99%

Characterization and application of C–TiO₂ doped cellulose acetate nanocomposite film for removal of Reactive Red-195

Pham

Ngo

et al. 2020

Chemical Engineering Communications

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Optical and photo catalytic characteristics of Ag2S/TiO2 nanocomposite films prepared by electrochemical anodizing and SILAR approach

Cited by 33 publications

References 37 publications

Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst

Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Characterization and application of C–TiO₂ doped cellulose acetate nanocomposite film for removal of Reactive Red-195

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Optical and photo catalytic characteristics of Ag2S/TiO2 nanocomposite films prepared by electrochemical anodizing and SILAR approach

Cited by 33 publications

References 37 publications

Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst

Investigations on the enhanced dye degradation activity of heterogeneous BiFeO3–GdFeO3 nanocomposite photocatalyst

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO2‐SiO2 Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Characterization and application of C–TiO2 doped cellulose acetate nanocomposite film for removal of Reactive Red-195

Contact Info

Product

Resources

About

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Characterization and application of C–TiO₂ doped cellulose acetate nanocomposite film for removal of Reactive Red-195