Infrared Absorption Studies on Peroxy Titanium Sulphate

Jere, G.V.; Patel, C. C.

doi:10.1139/v62-238

Cited by 33 publications

(14 citation statements)

References 4 publications

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“…Peroxog roups are found to be coordinated in af airly rare m 3h 2 :h 2 :h 2 bridgingm ode recently reported in the crystal structure of lanthanide complexes [Ln 4 (O 2 ) 2 Cl 8 (Py) 10 ],Py (Ln = Sm, Eu, Gd;p y= pyridine), heterobimetallic Zn 4 Ln 7 (Ln = Gd, Dy) nanosized clusters and [Tb 3 (O 2 )(pic) 9 ] 2À (pic = picolinate). [13] The OÀOb ond length of the peroxidel igands in Th(O 2 )(SO 4 )(H 2 O) 2 equals ca.…”

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confidence: 81%

Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate

Bonato

Virot

Dumas

et al. 2019

Chemistry A European J

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The preparation and structural characterization of an original Th peroxo sulfate dihydrate, crystallizing at room temperature in the form of stable 1D polymeric microfibres is described. A combination of laboratory and synchrotron techniques allowed solution of the structure of the Th(O2)(SO4)(H2O)2 compound, which crystallizes in a new structure type in the space group Pna21 of the orthorhombic crystal system. Particularly, the peroxide ligand coordinates to the Th cations in an unusual μ3‐η2:η2:η2 bridging mode, forming an infinite 1D chain decorated with sulfato ligands exhibiting simultaneously monodentate and bidentate coordination modes.

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mentioning

confidence: 81%

Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate

Bonato

Virot

Dumas

et al. 2019

Chemistry A European J

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“…Compared to Rutile-H2 TiO 2 (characterized in our recent publication [34]), similarly, the broad band centered at 3400 cm −1 and the sharp band at 1630 cm −1 can be detected, which represent the stretching and bending vibrations of surface OH groups [46,47], and the small peak at 2357 cm −1 representing bonds containing carbon [46,48,49] can be attributed either to adsorbed CO 2 or residual contamination from the TiO 2 precursor. At 900 cm −1 a new peak was observed, which can be attributed either to free or complexed -OeO-vibrations [49,50] or the vibration of TieO bonds within the triangular peroxy titanyl group [48,51,52]. Most importantly, in case of pH3_55 sample, TieOeO stretching vibrations (representing peroxo groups at 667 cm -1 [44,49,53,54]) could be detected, in contrast with Rutile-H2 (and pH3_70) titania, where it was deduced, that the quantity of the peroxo groups was under the threshold of detection of the IR spectrometer and it was only observable by the more sensitive XPS measurements [34].…”

Section: Infrared and Raman Spectroscopy Measurementsmentioning

confidence: 99%

Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

et al. 2018

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A B S T R A C TIn the present study hydrogen peroxide was applied during the synthesis of titanium dioxide (TiO 2 ) photocatalysts to anchor peroxo groups onto the surface to enhance visible light excitability. The effect of changes in the pH value and crystallization temperature was investigated. As-prepared peroxo-titania were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), infrared spectroscopy (IR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was investigated using phenol as model contaminant under visible light irradiation. IR and XPS measurements confirmed the presence of peroxo groups in the samples, moreover Raman and XPS measurements showed the formation of amorphous sodium titanate. Photocatalytic activity measurements pointed out, that most efficient as-prepared photocatalyst exceeded the photocatalytic performance of all reference materials. The cause of the enhanced photocatalytic activity was attributed to the enhanced visible light excitability and considerable amount of peroxo groups, which were not stable after the reusability experiments of the photocatalysts, suffering a redox reaction with the relatively high amount of Ti 3+ , resulting Ti 4+ and surface OH groups. Therefore, the loss of peroxo groups and concomitantly photocatalytic activity was observed. (Z. Pap).Catalysis Today xxx (xxxx) xxx-xxx 0920-5861/

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“…The band at 1385 cm -1 can be assigned to adsorbed carbonates on surfaces of TiO 2 , formed probably by the adsorption of CO 2 from air [47]. Surface-adsorbed sulfate ions are probably responsible for a small band at 1100 cm -1 [48]. The peak located at ~ 463 cm -1 in the FT-IR spectrum is likely due to the vibration of the Ti–O bond [49].…”

Section: Resultsmentioning

confidence: 99%

Hydrogen peroxide route to Sn-doped titania photocatalysts

Štengl

Grygar

Henych

et al. 2012

Chemistry Central Journal

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BackgroundThe work aims at improving photocatalytic activity of titania under Vis light irradiation using modification by Sn ions and an original, simple synthesis method. Tin-doped titania catalysts were prepared by thermal hydrolysis of aqueous solutions of titanium peroxo-complexes in the presence of SnCl4 or SnCl2 using an original, proprietary "one pot" synthesis not employing organic solvents, metallo-organic precursors, autoclave aging nor post-synthesis calcination. The products were characterized in details by powder diffraction, XPS, UV–vis, IR, and Raman spectroscopies, electron microscopy and surface area and porosity measurementsResultsThe presence of tin in synthesis mixtures favors the formation of rutile and brookite at the expense of anatase, decreases the particle size of all formed titania polymorphs, and extends light absorption of titania to visible light region >400 nm by both red shift of the absorption edge and introduction of new chromophores. The photocatalytic activity of titania under UV irradiation and >400 nm light was tested by decomposition kinetics of Orange II dye in aqueous solutionConclusionsDoping by Sn improves titania photoactivity under UV light and affords considerable photoactivity under >400 nm light due to increased specific surface area and a phase heterogeneity of the Sn-doped titania powders.

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Infrared Absorption Studies on Peroxy Titanium Sulphate

Abstract: The infrared absorption spectrum of peroxy titanium sulphate has been studied in the region from 2 to 23 and the various bands are characterized. The sulphate group in the compound is shown to have C2c sylllllletry, indicating its bidentate nature.

Cited by 33 publications

References 4 publications

Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate

Deciphering the Crystal Structure of a Scarce 1D Polymeric Thorium Peroxo Sulfate

Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

Hydrogen peroxide route to Sn-doped titania photocatalysts

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