17O and 29Si Solid State NMR Study of Atomic Scale Structure in Sol-Gel-Prepared TiO2-SiO2 Materials

Dirken, P.J.; Smith, Mark E.; Whitfield, H. J.

doi:10.1021/j100001a059

Cited by 115 publications

(107 citation statements)

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“…To date the only 17 O information reported from Ti-O-Si linkages in well-defined crystalline compounds has been from fresnoite [20] and Li 2 TiOSiO 4 [28]. In fresnoite a resonance at 190 ppm was observed from the Ti-O-Si unit but no other parameters could be deduced.…”

Section: Implications For Observation Of Ti-o-si Linkagesmentioning

confidence: 99%

“…For the crystalline materials with Ti-O-Si linkages the 17 O NMR shows second-order quadrupolar lineshapes (at least at lower applied magnetic fields). However in amorphous TiO 2 -SiO 2 gels a featureless 17 O resonance from Ti-O-Si is observed [20,21]. These 17 O Ti-O-Si lines are also broadened by chemical shift dispersion so that the highest applied magnetic field may not be optimum for observing 17 O NMR from such gels.…”

Section: Implications For Observation Of Ti-o-si Linkagesmentioning

confidence: 99%

“…Hence the coordination and bonding of oxygen can be distinguished through the 17 O isotropic chemical shift (δ iso ), which spans a large range ≈ 1500 ppm, and quadrupolar coupling parameters (C Q the quadrupole coupling constant and η the asymmetry parameter). Studies of connectivity between different metallic atoms in transition metal-oxo systems using 17 O NMR have recently been reported [15][16][17][18] but little work has been published on Si-O-Ti containing systems in the solid state [19][20][21]. The main drawback of 17 O NMR is its poor sensitivity due to its low natural abundance (0.037%).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solid State NMR Interaction Parameters of Oxygens Linking Titanium and Silicon in Crystalline Cyclic Titanodiphenylsiloxanes

Gervais

Babonneau

Hoebbel

et al. 2000

Solid State Nuclear Magnetic Resonance

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Section: Implications For Observation Of Ti-o-si Linkagesmentioning

confidence: 99%

Section: Implications For Observation Of Ti-o-si Linkagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solid State NMR Interaction Parameters of Oxygens Linking Titanium and Silicon in Crystalline Cyclic Titanodiphenylsiloxanes

Gervais

Babonneau

Hoebbel

et al. 2000

Solid State Nuclear Magnetic Resonance

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“…There are two main resonances, one at $0 parts in 10 6 and the other at $180 parts in 10 6 . By comparison with NMR data from TiO 2 ±SiO 2 gels (Dirken et al, 1995), these can be assigned to SiÐOÐSi at 0 parts in 10 6 and SiÐOÐTi at 180 parts in 10 6 . There is also a minor peak at $540 parts in 10 6 , which is probably OTi 3 .…”

Section: Thementioning

confidence: 91%

A study of Li₂TiOSiO₄ and Li₂TiOGeO₄ by X-ray powder and electron single-crystal diffraction, ¹⁷O MAS NMR and O K-edge and Ti L _2,3-edge EELS

et al. 1999

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X-ray powder and electron single-crystal diffraction of crystals of Li 2 TiOSiO 4 and Li 2 TiOGeO 4 showed them to be tetragonal, space group P4/nmm unit-cell parameters a 6X4379 2, c 4X40032 2 A Ê for Li 2 TiOSiO 4 and a 6X6110 8, c 4X4372 6 A Ê for Li 2 TiGeO 4 . The compounds are isostructural with their sodium analogues but are considerably compressed along the c axis owing to the smaller size of lithium compared with sodium atoms. Square-pyramidal TiO 5 groups are joined in these compounds by tetrahedral SiO 4 and GeO 4 groups, respectively. 17 O nuclear magnetic resonance spectra of the two compounds, isotopically enriched with 17 O, showed peaks due to the apical titanyl, TiÐO, and basal, bridging, TiÐOÐSi or TiÐOÐGe, oxygen atoms of the title compounds. By comparison with reference spectra, oxygen K edges and titanium L 2,3 edges of electron energy-loss spectra were tentatively assigned.

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“…The absorption peaks at about 1630 and 3430 cm −1 are attributed to the bending and stretching vibrations of surface water molecules. Finally, the bands at 470, 800, and 1096 cm −1 are associated with the Si-O-Si deformation pattern, and symmetric and asymmetric stretching vibration, respectively [13,18]. These bands are stronger in the R-TiO2/SiO2 sample than in the other two, indicating that the Si present in the aquatic plant leaves was introduced to the resulting TiO2/SiO2 composites.…”

Section: Components Structures and Morphologies Of Tio 2 /Sio 2 Phomentioning

confidence: 97%

Biotemplated Mesoporous TiO2/SiO2 Composite Derived from Aquatic Plant Leaves for Efficient Dye Degradation

Yan

Guo

et al. 2017

Catalysts

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Abstract:The biotemplating technique is an environmental-protective high-efficiency new technology by which the resulting TiO 2 may simultaneously attain the duplication of structure and self-doping elements from biotemplate materials, which is highly desirable for photocatalytic applications. In this paper, aquatic plant leaves-including reed, water hyacinth, and duckweed-were used as both templates and silicon precursors to successfully synthesize biomorphic TiO 2 /SiO 2 composite with mesoporous structures. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 adsorption-desorption, and UV-visible diffuse reflectance spectra were applied to characterize the microstructures of the samples. The results show that all TiO 2 /SiO 2 composites are mainly composed of an anatase phase with mesoporous structure and possess high specific surface area. Compared with commercial Degussa P25 TiO 2 , all TiO 2 /SiO 2 samples display intensive light-harvesting efficiency, particularly in the visible light range. The activities were evaluated by using gentian violet as a target for photocatalytic degradation experiments under simulated solar irradiation. The TiO 2 /SiO 2 samples templated by reed and water hyacinth leaves exhibit high activity, while the TiO 2 /SiO 2 samples obtained from duckweed are inferior to P25 in the degradation of gentian violet. A synergistic effect of SiO 2 incorporation and structural construction through biotemplating is proposed to be beneficial to photocatalytic activity.

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17O and 29Si Solid State NMR Study of Atomic Scale Structure in Sol-Gel-Prepared TiO2-SiO2 Materials

Cited by 115 publications

References 3 publications

Solid State NMR Interaction Parameters of Oxygens Linking Titanium and Silicon in Crystalline Cyclic Titanodiphenylsiloxanes

Solid State NMR Interaction Parameters of Oxygens Linking Titanium and Silicon in Crystalline Cyclic Titanodiphenylsiloxanes

A study of Li₂TiOSiO₄ and Li₂TiOGeO₄ by X-ray powder and electron single-crystal diffraction, ¹⁷O MAS NMR and O K-edge and Ti L _2,3-edge EELS

Biotemplated Mesoporous TiO2/SiO2 Composite Derived from Aquatic Plant Leaves for Efficient Dye Degradation

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17O and 29Si Solid State NMR Study of Atomic Scale Structure in Sol-Gel-Prepared TiO2-SiO2 Materials

Cited by 115 publications

References 3 publications

Solid State NMR Interaction Parameters of Oxygens Linking Titanium and Silicon in Crystalline Cyclic Titanodiphenylsiloxanes

Solid State NMR Interaction Parameters of Oxygens Linking Titanium and Silicon in Crystalline Cyclic Titanodiphenylsiloxanes

A study of Li2TiOSiO4 and Li2TiOGeO4 by X-ray powder and electron single-crystal diffraction, 17O MAS NMR and O K-edge and Ti L 2,3-edge EELS

Biotemplated Mesoporous TiO2/SiO2 Composite Derived from Aquatic Plant Leaves for Efficient Dye Degradation

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A study of Li₂TiOSiO₄ and Li₂TiOGeO₄ by X-ray powder and electron single-crystal diffraction, ¹⁷O MAS NMR and O K-edge and Ti L _2,3-edge EELS