Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process

Ban, Takayuki; Asano, Kentaro; Takai-Yamashita, Chika; Ohya, Yutaka

doi:10.1039/d0na00376j

Cited by 8 publications

(2 citation statements)

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“…The majority of the reports about titanium phosphates synthesis rely on the utilization of humidity-sensitive, volatile and toxic titanium derivatives such as titanium tetrachloride [ 33 , 34 , 35 , 36 , 37 ], titanium tetraisopropoxide [ 38 , 39 , 40 ] or titanium tetrabutoxide [ 41 , 42 , 43 ]. Phosphatization of titania occurs with phosphoric acid or with water-soluble phosphate salts.…”

Section: Resultsmentioning

confidence: 99%

Microspherical Titanium-Phosphorus Double Oxide: Hierarchical Structure Development for Sensing Applications

Korina

Abramyan

Bol’shakov

et al. 2023

Sensors

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Stable, water-soluble titanium complexed with mandelic acid was used as a precursor for titanium phosphorus double oxide obtained in hydrothermal conditions in the presence of phosphoric acid. Surprisingly, hydrolysis of organic complexes provided a microstructured sphere with narrow size distribution, low aggregation and a small fraction of morphological irregularities. Obtained microspheres had a complex structure comprised of flakes, whose size could be manipulated with temperature conditions. Samples were found to be electrochemically active against sulcotrione, a well-recognized herbicide. Electrochemical sensors based on the synthesized microspheres were successfully adapted for natural water reservoir analysis and exhibited low levels of detection of 0.61 µM, limit of quantification of 1.86 µM, wide dynamic linear range from 2 to 200 µM, good selectivity, excellent reproducibility and in-time stability.

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Section: Resultsmentioning

confidence: 99%

Microspherical Titanium-Phosphorus Double Oxide: Hierarchical Structure Development for Sensing Applications

Korina

Abramyan

Bol’shakov

et al. 2023

Sensors

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“…Unfortunately, converting the morphology of the bulk structure into ultrathin nanosheets is challenging because the intralayer coordination bonds are easily broken during synthesis. Wet bottom-up chemical synthesis has been demonstrated to be the most favorable approach for preparing ultrathin nanosheets with high yields [ 33 , 34 ]. It should also be noted that this synthesis protocol prevents the grown ultrathin nanosheets from stacking together.…”

Section: Introductionmentioning

confidence: 99%

Bromine Ion-Intercalated Layered Bi2WO6 as an Efficient Catalyst for Advanced Oxidation Processes in Tetracycline Pollutant Degradation Reaction

Chava,

Kang

2023

Nanomaterials

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The visible-light-driven photocatalytic degradation of pharmaceutical pollutants in aquatic environments is a promising strategy for addressing water pollution problems. This work highlights the use of bromine-ion-doped layered Aurivillius oxide, Bi2WO6, to synergistically optimize the morphology and increase the formation of active sites on the photocatalyst’s surface. The layered Bi2WO6 nanoplates were synthesized by a facile hydrothermal reaction in which bromine (Br−) ions were introduced by adding cetyltrimethylammonium bromide (CTAB)/tetrabutylammonium bromide (TBAB)/potassium bromide (KBr). The as-synthesized Bi2WO6 nanoplates displayed higher photocatalytic tetracycline degradation activity (~83.5%) than the Bi2WO6 microspheres (~48.2%), which were obtained without the addition of Br precursors in the reaction medium. The presence of Br− was verified experimentally, and the newly formed Bi2WO6 developed as nanoplates where the adsorbed Br− ions restricted the multilayer stacking. Considering the significant morphology change, increased specific surface area, and enhanced photocatalytic performance, using a synthesis approach mediated by Br− ions to design layered photocatalysts is expected to be a promising system for advancing water remediation.

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Anisotropic Crystal Growth of Layered Vanadates with Bulky Interlayer Cations

Ban

Konishi

Mizuno

et al. 2023

Cryst. Res. Technol.

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The crystallization behavior of layered tetramethylammonium octavanadate [N(CH 3 ) 4 ]V 8 O 20 including both V 4+ and V 5+ during hydrothermal synthesis is examined. According to the Bravais-Friedel-Donnay-Harker law, layered metalate crystals with bulky interlayer cations tend to have shapes with large surfaces parallel to the metalate layers; however, small rodlike crystals elongated along the direction normal to the vanadate layers are produced at the early stage of crystallization. As the crystallization proceeds, the crystal shapes are changed to large belt-like and platelike ones with the largest surfaces parallel to the vanadate layers. If sols containing only the small rodlike crystals formed at the early stage of crystallization are prepared, they will be useful for the fabrication of thin films with the vanadate layers vertically aligned normal to the substrate surface. Furthermore, ultrasonic treatment of the aqueous suspensions of the [N(CH 3 ) 4 ]V 8 O 20 crystals leads to their exfoliation to a thickness of several tens of nanometers. For the relation between crystal shapes and crystallographic directions, the small crystals obtained using ultrasonic treatment are different from the ones formed at the early stage of crystallization. Probably, the morphology of the small rodlike crystals formed at the early stage of crystallization is attributed to the metastable growth form.

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Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process

Abstract:
Highly water-dispersible flake-like titanophsphate nanosheets were synthesized by one-pot process controlling the acid–base reactions between Ti species, phosphoric acid, and the hydroxides of bulky cations in very weakly basic aqueous sols.

Cited by 8 publications

References 35 publications

Microspherical Titanium-Phosphorus Double Oxide: Hierarchical Structure Development for Sensing Applications

Microspherical Titanium-Phosphorus Double Oxide: Hierarchical Structure Development for Sensing Applications

Bromine Ion-Intercalated Layered Bi2WO6 as an Efficient Catalyst for Advanced Oxidation Processes in Tetracycline Pollutant Degradation Reaction

Anisotropic Crystal Growth of Layered Vanadates with Bulky Interlayer Cations

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Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process

Abstract: Highly water-dispersible flake-like titanophsphate nanosheets were synthesized by one-pot process controlling the acid–base reactions between Ti species, phosphoric acid, and the hydroxides of bulky cations in very weakly basic aqueous sols.

Cited by 8 publications

References 35 publications

Microspherical Titanium-Phosphorus Double Oxide: Hierarchical Structure Development for Sensing Applications

Microspherical Titanium-Phosphorus Double Oxide: Hierarchical Structure Development for Sensing Applications

Bromine Ion-Intercalated Layered Bi2WO6 as an Efficient Catalyst for Advanced Oxidation Processes in Tetracycline Pollutant Degradation Reaction

Anisotropic Crystal Growth of Layered Vanadates with Bulky Interlayer Cations

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Abstract:
Highly water-dispersible flake-like titanophsphate nanosheets were synthesized by one-pot process controlling the acid–base reactions between Ti species, phosphoric acid, and the hydroxides of bulky cations in very weakly basic aqueous sols.