Structural, optical and photoluminescence studies of sol-gel synthesized pure and iron doped TiO2 photocatalysts

Komaraiah, Durgam; Radha, Eppa; Kalarikkal, Nandakumar; Sivakumar, J.; Reddy, M.V. Ramana; Sayanna, R.

doi:10.1016/j.ceramint.2019.03.170

Cited by 91 publications

(50 citation statements)

References 62 publications

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“…Based on this, and the results of a previous X-ray photoelectron spectroscopy (XPS) study that revealed the coexistence of Co 2+ and Co 3+ on the surface of Co-doped TiO 2 NPs [25], and by comparing the cationic radius values of Co 2+ (0.74 Å), Co 3+ (0.61 Å), Fe 2+ (0.76 Å), and Fe 3+ (0.65 Å) to that of Ti 4+ (0.68 Å) [25,28,30,31,32], we hypothesize that some of the doping elements were incorporated into the structures of Titania and replaced the titanium ions, which induced a perturbation in anatase crystal structure; as a result, the crystallinity decreased and the peak position shifted. A similar behavior was reported in the literature [15,28,32,33].…”

Section: Resultsmentioning

confidence: 99%

“…The photoluminescence technique is useful to study the separation and recombination of excited electrons and holes [30,66]. Therefore, all samples were characterized by PL.…”

Section: Resultsmentioning

confidence: 99%

“…These observations evidenced that the optical properties of TiO 2 nanoparticles were significantly affected, and it was suggested that doping TiO 2 with Fe or Co may significantly suppress the electron-hole pair recombination [19,30,38,70,71], which can also be favorable for photocatalytic reactions [72,73].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

et al. 2019

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Pure TiO2 and Fe- and Co-doped TiO2 nanoparticles (NPs) as photocatalysts were synthesized using wet chemical methods (sol-gel + precipitation). Their crystalline structure and optical properties were analyzed using X-ray diffraction (XRD), Raman spectroscopy and Fourier-transform infrared (FTIR) spectroscopy, ultraviolet-visible light (UV-Vis) diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of the synthesized nanoparticles was evaluated through degradation of carbamazepine (CBZ) under UV-A and visible-light irradiations. The XRD and Raman analyses revealed that all synthesized nanomaterials showed only the anatase phase. The DRS results showed that the absorption edge was blue-shifted for Fe-doped TiO2 NPs. The decrease in charge recombination was evidenced from the PL investigation for both Co-doped and Fe-doped TiO2 nanomaterials. An enhancement in photocatalytic degradation of carbamazepine in aqueous suspension under both UV-A light and visible-light irradiations was observed for Fe-doped Titania NPs by comparison with pure TiO2. These results suggest that the doping cations could suppress the electron/hole recombination. Therefore, the photocatalytic activity of TiO2-based nanomaterials was enhanced.

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Section: Resultsmentioning

confidence: 99%

“…The photoluminescence technique is useful to study the separation and recombination of excited electrons and holes [30,66]. Therefore, all samples were characterized by PL.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

et al. 2019

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“…The Raman modes shifted towards longer wavenumber side and the peaks intensity decrease whereas width increases because of the lattice distortion and presence of defect levels. The phonon lifetime of the metal ion‐doped titania films is estimated using the uncertainty relation 20 . The estimated phonon lifetimes for the T2, F7, C7, N7, and A7 films are 4.71 × 10 −13 , 3.032 × 10 −13 , 3.467 × 10 −13 , 3.197 × 10 −13 and 2.219 × 10 −13 s, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, for the charge reoccurrence for electroneutrality in metal ion‐doped TiO 2 , O 2− can easily escape to trap photoinduced holes (Equation ) and generate hydroxide radicals (Equation ). Metal ions can act as photoinduced hole trappers (Equation ) 20,62–66 . The generated hydroxide radicals (OH˙) (Equations , and ) have a more oxidation power and can depollute the organic pollutants thoroughly (Equation ).…”

Section: Resultsmentioning

confidence: 99%

Effect of metal ions doping on structural, optical properties and photocatalytic activity of anatase TiO₂ thin films

Komaraiah

Radha

Reddy

et al. 2020

Surface & Interface Analysis

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The metal ion‐doped (Fe3+, Co2+, Ni2+ and Ag+) TiO2 nanocrystalline thin films were spin‐coated on glass substrates. The grazing incidence X‐ray diffractometer (GIXRD), SEM, energy‐dispersive X‐ray Spectroscopy (EDX), Raman, UV–VIS and a fluorescence spectrometer were employed to study the structural, compositional and optical properties of metal‐doped TiO2 films. As revealed by GIXRD, all the metal‐doped TiO2 thin films were found to anatase tetragonal crystal structure. The deposited films were optimized using annealing temperature (550°C) to get high‐quality crystalline films with the anatase phase. The thin films with the specific surface area of Fe‐, Co‐, Ni‐ and Ag‐doped anatase TiO2 nanocrystals are 152.18, 88.25 96.68 and 178.38 m2/g, respectively, which has been calculated by GIXRD results. Optical transmittance spectra were used to determine the thickness, band gap energy and refractive index of metal‐doped TiO2 thin films. The characteristic vibrational Raman modes also revealed that the films were found to be anatase phase. The intensity of luminescence emission decreases with the doping of metal ions. Metal‐doped TiO2 films exhibit strong photocatalytic performance than undoped TiO2 films. The degradation efficiencies typically increase with the different dopants for the visible‐light degradation of methylene blue (MB) and methyl orange (MO). Moreover, the photocatalytic activity (PCA) of silver ion‐doped titania thin film is found to be better than that of Fe3+‐, Co2+‐, and Ni2+‐doped TiO2 films.

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Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

et al. 2020

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Titanium dioxide (TiO2) has the advantages of strong photocatalytic activity, non‐toxicity, and low cost, and so on. It has always occupied a dominant position in many photocatalytic materials, especially nanoscale spherical TiO2 has the characteristics of high specific surface area and pore‐volume, and so on. Therefore, Degussa P25, as a typical representative of the nanoscale spherical structure, is currently the only material produced on a large scale. According to the structure, nanoscale spherical TiO2 can be divided into three types: solid, core‐shell, and hollow spheres. However, there is still a lack of the latest review on the synthetic doping and application of nanoscale spherical TiO2. Therefore, we first describe the degradation mechanism of nanoscale spherical TiO2 and summarize the latest progress of its synthesis strategy in this review, including doping and other modification techniques, and finally introduce the application of nanoscale spherical TiO2 photocatalytic degradation of volatile organic compounds, dye wastewater, antibiotics, pesticides, and oily wastewater. Through this review, it is helpful for researchers to further understand the synthesis and application of nanoscale spherical TiO2, hoping to continuously improve the disadvantages and photocatalytic activity of nanoscale spherical TiO2, and promote the widespread application of nanoscale spherical TiO2 on an industrial scale.

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Structural, optical and photoluminescence studies of sol-gel synthesized pure and iron doped TiO2 photocatalysts

Cited by 91 publications

References 62 publications

Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

Effect of metal ions doping on structural, optical properties and photocatalytic activity of anatase TiO₂ thin films

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

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Structural, optical and photoluminescence studies of sol-gel synthesized pure and iron doped TiO2 photocatalysts

Cited by 91 publications

References 62 publications

Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

Effect of metal ions doping on structural, optical properties and photocatalytic activity of anatase TiO2 thin films

Progress on the nanoscale spherical TiO2 photocatalysts: Mechanisms, synthesis and degradation applications

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Product

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Effect of metal ions doping on structural, optical properties and photocatalytic activity of anatase TiO₂ thin films

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications