Visible light-induced degradation of organic dyes by niobium tellurium oxides ANbTeO6 (A = Rb, Cs) with β-pyrochlore structure

Belousov, Artem S.; Сулейманов, Е. В.; Parkhacheva, Alina A.

doi:10.1016/j.matlet.2022.133081

Cited by 12 publications

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“…The RbTe 1.5 W 0.5 O 6 , CsTeMoO 6 , and RbNbTeO 6 photocatalysts were prepared via a solid-state reaction, as described in previous works [ 13 , 51 ]. Briefly, stoichiometric amounts of CsNO 3 (99%), RbNO 3 (99%), TeO 2 (99%), MoO 3 (99%), WO 3 (99%), or Nb 2 O 5 (99%) were mixed in an agate mortar and sintered at 700–750 °C for 24 h in a platinum crucible at a heating rate of 5 °C/min.…”

Section: Methodsmentioning

confidence: 99%

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Photocatalytic Synthesis of Materials for Regenerative Medicine Using Complex Oxides with β-pyrochlore Structure

Семенычева

Chasova

Fukina

et al. 2023

Life

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Graft copolymerization of methyl methacrylate onto cod collagen was carried out under visible light irradiation (λ = 400–700 nm) at 20–25 °C using the RbTe1.5W0.5O6, CsTeMoO6, and RbNbTeO6 complex oxides with β-pyrochlore structure as photocatalysts. The as-prepared materials were characterized by X-ray diffraction, scanning electron microscopy, and UV-Vis diffuse reflectance spectroscopy. It was also found that RbNbTeO6 with β-pyrochlore structure was not able to photocatalyze the reaction. Enzymatic hydrolysis of the obtained graft copolymers proceeds with the formation of peptides with a molecular weight (MW) of about 20 and 10 kDa. In contrast to collagen, which decomposes predominantly to peptides with MW of about 10 kDa, the ratio of fractions with MW of about 10 kDa and 20 kDa differs much less, their changes are symbatic, and the content of polymers with MW of more than 20 kDa is about 70% after 1 h in the case of graft copolymers. The data obtained indicate that synthetic fragments grafted to the collagen macromolecule do not prevent the hydrolysis of the peptide bonds but change the rate of polymer degradation. This is important for creating network matrix scaffolds based on graft copolymers by cross-linking peptides, which are products of enzymatic hydrolysis.

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Section: Methodsmentioning

confidence: 99%

“…The details of physicochemical properties of the prepared materials are presented in our previous works [ 15 , 51 ].…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic Synthesis of Materials for Regenerative Medicine Using Complex Oxides with β-pyrochlore Structure

Семенычева

Chasova

Fukina

et al. 2023

Life

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Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A₂O‐V₂O₅‐2TeO₃ (A=Rb, Cs) System

et al. 2023

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Two new isostructural compounds with composition of Rb + V 3 + 0.125 V 5 + 0.625 Te 6 + 1.25 O 6 and Cs + V 3 + 0.125 V 5 + 0.625 Te 6 + 1.25 O 6 have been synthesized by solid-state reaction. The crystal structure has been determined by X-ray diffraction analysis using Rietveld refinement. Both compounds possess β-pyrochlore structuretype with cubic space group Fd-3 m (Z = 8); the unit cell parameters: a = 10.04120(27) Å for RbV 0.75 Te 1.25 O 6 Å and a = 10.09119(23) Å for CsV 0.75 Te 1.25 O 6 . The oxidation states of vanadium and tellurium have been confirmed by X-ray photoelectron spectroscopy. The compounds contain vanadium in mixed valence state (3 + and 5 +). The compounds possess the unusual narrow band gap for oxide compounds -in the infrared (IR) range (~0.6 eV). The schematic electronic structure of the compounds has been estimated using XPS, UPS and electronic conductivity data; however, the shifts of the top of the valence edge and the bottom of the conduction band in the water conditions have been calculated using theoretical approximation. The thermal behavior of obtained compounds has been studied by differential thermal analysis. RbV 0.75 Te 1.25 O 6 and CsV 0.75 Te 1.25 O 6 melts at low temperatures (~500 °C) with decomposition and weight loss. The RbV 0.75 Te 1.25 O 6 powder decomposes to amorphous phase, whereas CsV 0.75 Te 1.25 O 6 transform into new β-pyrochlore compound with another composition.

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Methods for Preparation of Pyrochlore Oxides and Their Effect on the Photocatalytic Activity

Belousov

2023

Green Chemistry and Sustainable Technology

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Visible light-induced degradation of organic dyes by niobium tellurium oxides ANbTeO6 (A = Rb, Cs) with β-pyrochlore structure

Cited by 12 publications

References 14 publications

Photocatalytic Synthesis of Materials for Regenerative Medicine Using Complex Oxides with β-pyrochlore Structure

Photocatalytic Synthesis of Materials for Regenerative Medicine Using Complex Oxides with β-pyrochlore Structure

Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A₂O‐V₂O₅‐2TeO₃ (A=Rb, Cs) System

Methods for Preparation of Pyrochlore Oxides and Their Effect on the Photocatalytic Activity

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Visible light-induced degradation of organic dyes by niobium tellurium oxides ANbTeO6 (A = Rb, Cs) with β-pyrochlore structure

Cited by 12 publications

References 14 publications

Photocatalytic Synthesis of Materials for Regenerative Medicine Using Complex Oxides with β-pyrochlore Structure

Photocatalytic Synthesis of Materials for Regenerative Medicine Using Complex Oxides with β-pyrochlore Structure

Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A2O‐V2O5‐2TeO3 (A=Rb, Cs) System

Methods for Preparation of Pyrochlore Oxides and Their Effect on the Photocatalytic Activity

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Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A₂O‐V₂O₅‐2TeO₃ (A=Rb, Cs) System