Enhanced photocatalytic activity of europium doped TiO2 under sunlight for the degradation of methyl orange

Khade, G. V.; Gavade, N. L.; Suwarnkar, M. B.; Dhanavade, Maruti J.; Sonawane, Kailas D.; Garadkar, K. M.

doi:10.1007/s10854-017-6883-9

Cited by 32 publications

(15 citation statements)

References 45 publications

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“…Therefore, much effort has been expended to reduce the recombination rate of TiO 2 and to enhance its photocatalytic efficiency under both UV and visible light irradiation. Several approaches have been undertaken, including doping with non-metals such N, C and S [33][34][35][36], transition metals (TM) including Fe, Co, Cr, Cu, Mo and Ta [37][38][39][40][41][42][43] or rare earth metals such as Ce, La, Eu and Ga [44][45][46][47][48][49], inducing structural defects such as Ti 3+ or oxygen vacancies [50][51][52], and coupling TiO 2 with noble metals [14,53,54], narrow bandgap semiconductors [55,56], hydroxyapatite [57] or graphene [54] giving rise to TiO 2 -based hybrid structures with improved properties. Among the different approaches, the incorporation of dopants in low concentrations into the TiO 2 lattice have been shown to be a simple an effective way to reduce the electron-hole recombination rate and enhance absorption in the visible region of the electromagnetic spectrum.…”

Section: Introductionmentioning

confidence: 99%

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

et al. 2019

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TiO 2 and TM-doped TiO 2 (TM = Re, Ru) anatase crystalline nanopowders were synthesized by a simple hydrothermal method. Samples with nominal TM/Ti ratio of 0.01 were prepared for this study. Their structural, microstructural and optical properties were studied. The lattice parameters of the different prepared samples were calculated and their mean crystallite sizes determined to be in the range 15-7 nm, the lower values being obtained for the doped crystallites. The samples' specific surface areas were determined and correlated with their mean crystallite sizes. The incorporation of the dopant elements results in an increase of the optical absorption in the visible range. The samples' optical bandgap and Urbach energies were calculated from UV-Vis diffuse reflectance spectra. The photocatalytic behavior of the synthesized samples was investigated for the rhodamine B and phenol degradation processes, the kinetics of the different photo-oxidation reactions being also studied. The results showed that doping either with Re or Ru can lead to enhancement of the TiO 2 photocatalytic efficiency and that, among the synthesized samples Ru-doped TiO 2 is the most efficient photocatalyst for both the Rhodamine B and phenol photodegradation reactions.

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Section: Introductionmentioning

confidence: 99%

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

et al. 2019

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“…By doping metal ions, impurity levels form near the bottom of CB or the top of VB, leading to the narrowing of the TiO 2 band gap. For the degradation of organic compounds under VL irradiation, many researchers have synthesized TiO 2 doped with various metal ions (M-TiO 2 ) by the sol–gel method. − Typical procedures are as follows: titanium alkoxides dissolved into alcohols are added dropwise to aqueous acidic solution containing metal ions, and then, the obtained mixture is evaporated, dried, and sintered. Sol–gel synthesis can be easily conducted without any special equipment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixed Valence States of Platinum Ion Dopants on the Photocatalytic Activity of Titanium Dioxide under Visible Light Irradiation

Nishiyama

Yamazaki

2017

ACS Omega

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Titanium dioxide doped with the Pt ion (Pt–TiO 2 ) was synthesized by a sol–gel method using only water as the solvent and conducting dialysis. The photocatalytic activity for the degradation of 4-chlorophenol (4-CP) on Pt–TiO 2 was not affected by the Brunauer–Emmett–Teller specific surface area under visible light (VL) irradiation. X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure measurements revealed that only the Pt(IV) ion existed in the TiO 2 bulk and both Pt(II) and Pt(IV) were present near the Pt–TiO 2 surface. Pt(IV) is most likely substituted in the Ti(IV) site of the TiO 2 lattice because of their similar ionic sizes. Quantitative analysis of Pt(II) was performed in the XPS measurements, indicating that the amount of Pt(II) on the surface increased with an increase in the doping amount from 0.2 to 1.0 atom %. We synthesized 0.5 atom % Pt–TiO 2 with various Pt(II)/Pt(IV) ratios by changing the Ti(OC 3 H 7 ) 4 concentration used in the sol–gel synthesis. The 4-CP conversion on Pt–TiO 2 increased linearly with an increase in the Pt(II)/Pt(IV) ratios. A similar relationship was obtained with Pt–TiO 2 , which was prepared by a conventional sol–gel method in ethanol–water mixed solvent. Therefore, the Pt(II)/Pt(IV) ratio is a key factor affecting the photocatalytic activity of Pt–TiO 2 under VL irradiation. Our results indicate that controlling the mixed valence states of the doped metal ions is a new strategy to developing highly active metal-ion-doped TiO 2 under VL irradiation.

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“…This behavior may be interpreted considering the recent results reported for the Eu 3+ doped TiO 2 systems. It has been proposed that Eu 3+ doping successfully enhances the photocatalytic activity of TiO 2 , by reducing the recombination of electron/hole pairs by trapping photogenerated electrons 35 , 45 , 46 . In the present case, it seems reasonable that the Eu 3+ doped NaYF 4 system plays a similar role, decreasing the electron–hole recombination of the TiO 2 anatase component under UV irradiation, thus enhancing the photocatalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and photocatalytic properties of nanostructured lanthanide doped β-NaYF4/TiO2 composite films

Pennisi

Pellegrino

Licciardello

et al. 2022

Sci Rep

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The photocatalytic approach is known to be one of the most promising advanced oxidation processes for the tertiary treatment of polluted water. In this paper, β-NaYF4/TiO2 composite films have been synthetized through a novel sol–gel/spin-coating approach using a mixture of β-diketonate complexes of Na and Y, and Yb3+, Tm3+, Gd3+, Eu3+ as doping ions, together with the TiO2 P25 nanoparticles. The herein pioneering approach represents an easy, straightforward and industrially appealing method for the fabrication of doped β-NaYF4/TiO2 composites. The effect of the doped β-NaYF4 phase on the photocatalytic activity of TiO2 for the degradation of methylene blue (MB) has been deeply investigated. In particular, the upconverting TiO2/β-NaYF4: 20%Yb, 2% Gd, x% Tm (x = 0.5 and 1%) and the downshifting TiO2/β-NaYF4: 10% Eu composite films have been tested on MB degradation both under UV and visible light irradiation. An improvement up to 42.4% in the degradation of MB has been observed for the TiO2/β-NaYF4: 10% Eu system after 240 min of UV irradiation.

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Enhanced photocatalytic activity of europium doped TiO2 under sunlight for the degradation of methyl orange

Cited by 32 publications

References 45 publications

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

Effect of Mixed Valence States of Platinum Ion Dopants on the Photocatalytic Activity of Titanium Dioxide under Visible Light Irradiation

Synthesis, characterization and photocatalytic properties of nanostructured lanthanide doped β-NaYF4/TiO2 composite films

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