The crucial role of W6+, P5+and N3− dopant ions in the anatase TiO2 crystal lattice for enhanced photocatalytic activity under the irradiation of UV/solar light: Structure-reactivity correlation

Abraham, Cisy; Devi, L. Gomathi

doi:10.1016/j.matchemphys.2019.02.061

Cited by 10 publications

(3 citation statements)

References 61 publications

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“…The second is due to the reaction of β-and α-TCP with CaO, as in the BHA-1BaZrO 3 composite. The third is the formation of the Sigma-Ba 2 P 2 O 7 and Ba 3 P 2 O 8 phases due to the diffusion of phosphorus (ion radius: 0.38 Å [66]) into the Ba-O (2.948 Å [67]) gap. It has been concluded that these phases prevent the formation of TCPs, in a free form.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential of Barium Zirconate on the Sinterability and Properties of Bovine Hydroxyapatite

Pazarlıoğlu¹

2023

Ceramics - Silikaty

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In the present study, the potential of barium zirconate (BaZrO 3 ; 1-5 wt. %) on the sinterability, and properties of bovine hydroxyapatite (BHA) was evaluated. BHA decomposed into beta and alpha-tricalcium phosphate (β and α-TCP) at a 4.7 % rate. Tetracalcium phosphate (TTCP) was detected as the decomposition phase in the BaZrO 3 added BHAs, and it increased up to 10.7 % with an increasing BaZrO 3 ratio. In addition to TTCP, the phases of BaZrO 3 , Ba 2 ZrO 4 , σ-Ba 2 P 2 O 7 , Ba 3 P 2 O 8 and CaZrO 3 were detected in the composites. The addition of BaZrO 3 at an amount of 3 wt. % has a higher potential than the others to improve the sinterability and properties of BHA. It contributed to the increase in the fracture toughness from 0.99 ± 0.13 to 1.80 ± 0.12 MPa•m 1/2 and the compressive strength from 115. 75 ± 4.27 to 173.66 ± 13.61 MPa, and the decrease in the brittleness index from 4.24 ± 0.31 to 2.45 ± 0.15 µ -1/2 . The in-vitro bioactivity of BHA also increases with the additional BaZrO 3 . However; it is recommended to be used in applications that do not require load bearing in the human body due to its insufficient fracture toughness.

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential of Barium Zirconate on the Sinterability and Properties of Bovine Hydroxyapatite

Pazarlıoğlu¹

2023

Ceramics - Silikaty

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“…The activation energy for substitutional incorporation of N 3-ions in the TiO 2 lattice is quite high and the potential barrier for such incorporation can be extensively reduced by the presence of W 6+ ion in the crystal lattice [5]. Two W 6+ ions can replace three Ti 4+ ions leading to the formation of titanium vacancy (V Ti ) and similarly two N 3-ions can replace three O 2ions creating one oxygen vacancy (V o ) for maintaining the charge neutrality of the solid [8]. These structural defects and surface W=O entities extends the photoresponse of WNT to the visible region [8].…”

Section: Introductionmentioning

confidence: 99%

“…Two W 6+ ions can replace three Ti 4+ ions leading to the formation of titanium vacancy (V Ti ) and similarly two N 3-ions can replace three O 2ions creating one oxygen vacancy (V o ) for maintaining the charge neutrality of the solid [8]. These structural defects and surface W=O entities extends the photoresponse of WNT to the visible region [8]. In the present research study, WNT catalyst was surface modified with curcumin (Cur-WNT) and potassium curcuminate (K 3 Cur-WNT) molecules and these molecules show absorption maximum (λ max ) at 417 and 550 nm, respectively.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic and photosensitization reactions of surface modified W6+ and N3‒ doped TiO2 with curcumin/potassium curcuminate molecules

Abraham

Devi

2021

J Sol-Gel Sci Technol

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Curcumin and potassium curcuminate molecules were anchored on W 6+ and N 3doped TiO 2 catalyst (WNT) surface by wet impregnation method and were designated as Cur-WNT and K 3 Cur-WNT. The XPS and FTIR techniques confirm the surface anchoring of curcumin and potassium curcuminate molecules on the surface of WNT through enolate linkage. K 3 Cur-WNT catalyst possesses multiple charge trapping states involving dopant energy levels, inherently created defect levels/surface states. Hence the mean free path of the photogenerated electrons is decreased in this catalyst by trapping and detrapping events. The energy band positions of valence band (E VB ), conduction band (E CB ) and Fermi energy (E F ) were determined from the electronegativity values of the atoms present in the catalyst sample and also from the valence band X-ray photoelectron spectroscopic (VBXPS) studies. Energetically the position of conduction band (CB) and W 5d dopant energy levels were found to be located below the lowest unoccupied molecular orbital (LUMO) of curcumin and potassium curcuminate molecules in Cur-WNT and K 3 Cur-WNT samples. This suitable excited singlet energy band position (S 1 ) of sensitizer molecule facilitates the electron transfer process to the CB/W 5d energy levels of the WNT catalyst. The accumulated electrons in CB/W 6+ dopant energy level influence the position of E F within the band gap. The observed higher quantum efficiency of K 3 Cur-WNT sample compared to all the other catalysts can be accounted to the narrowed band gap, generated shallow traps, reduced particle size, enhanced photosensitivity and its higher capability in generating reactive singlet oxygen species.

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Enhancing oxygen reduction activity of α-MnO2 by defect-engineering and N doping through plasma treatments

Liu

et al. 2023

J Mater Sci

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The crucial role of W6+, P5+and N3− dopant ions in the anatase TiO2 crystal lattice for enhanced photocatalytic activity under the irradiation of UV/solar light: Structure-reactivity correlation

Cited by 10 publications

References 61 publications

Evaluation of the Potential of Barium Zirconate on the Sinterability and Properties of Bovine Hydroxyapatite

Evaluation of the Potential of Barium Zirconate on the Sinterability and Properties of Bovine Hydroxyapatite

Photocatalytic and photosensitization reactions of surface modified W6+ and N3‒ doped TiO2 with curcumin/potassium curcuminate molecules

Enhancing oxygen reduction activity of α-MnO2 by defect-engineering and N doping through plasma treatments

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