Synthesis and characterization of sodium titanates Na2Ti3O7 and Na2Ti6O13

Sauvet, Anne-Laure; Baliteau, S.; Lopez, C.; Fabry, P.

doi:10.1016/j.jssc.2004.09.008

Cited by 114 publications

(54 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…34 The details of these structures can be seen in the Figure 1 of reference 29. Sauvet et al 37 reported a study in which bulk Na 2 Ti 3 O 7 , under heating at 1100 °C , can be converted by a "dimerization-like" process into Na 2 Ti 6 O 13 . The presence of Na 2 Ti 6 O 13 in the decomposition products provides strong evidence that the structure and composition of the as-prepared NTTiO x is very close to Na 2 Ti 3 O 7 .…”

Section: Thermal Decomposition Of Titanate Nanotubesmentioning

confidence: 99%

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

Ferreira¹,

Filho²,

Filho³

et al. 2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Neste trabalho reportamos reações de troca iônica e decomposição térmica em nanotubos de óxido de titânio, obtidos pelo tratamento hidrotérmico de TiO 2 e NaOH. Considerando os resultados obtidos, sugerimos uma nova composição química para os nanotubos: Na 2 Ti 3 O 7 ·nH 2 O. Os resultados também indicam que a estrutura da parede dos nanotubos seria isoestrutural às lamelas observadas para o Na 2 Ti 3 O 7 bulk. Dependendo da natureza da lavagem (água deionizada ou solução ácida) executada no nanotubo após o tratamento hidrotérmico a concentração de íons Na + pode ser modificada através de um processo de troca iônica do Na + por H + . Tais resultados permitem sugerir a seguinte fórmula química geral para os nanotubos obtidos: Na 2-x H x Ti 3 O 7 ·nH 2 O (0≤ x ≤2), sendo x dependente das condições de lavagens.In this paper we report the ion exchange reactions and the thermal decomposition of titanium oxide nanotubes, obtained by hydrothermal treatment of TiO 2 and NaOH. Based on these results we propose a new composition for the as-prepared nanotubes as Na 2 Ti 3 O 7 ·nH 2 O. Our results also suggest that nanotube walls have structure similar to those observed in the layer of the bulk Na 2 Ti 3 O 7 . Depending on how the washing process is performed on the nanotubes (water or acid solutions) the Na + content can be modified via the exchange reaction of Na + by H + . Thus, a general chemical formula was also proposed: Na 2-x H x Ti 3 O 7 ·nH 2 O (0≤ x ≤2), x being dependent on the washing process.Keywords: titanate nanotubes, nanorods, TiO 2 , photocatalysis, hydrothermal treatment IntroductionThe discovery of carbon nanotubes in early 90's opened a new research area in materials science. 1 Since then, much attention has been given to the study and search for new materials with tubular structures. The understanding of nanotube formation mechanisms has significantly improved but a clear picture of this process is still an open subject. Since carbon nanotubes originate from graphite layers (graphene) a lot of effort has been devoted to prepare nanotubes from other layered materials. After carbon nanotubes the first studied inorganic nanotubes were WS 2 , MoS 2 , BN and NbS 2 . [2][3][4][5] The preparation of these nanotubes from layered materials leads to the thought that is possible to prepare nanotubes from all materials whose bulk counterpart is a layered compound. Nowadays, a considerable list of inorganic nanotubes is known and it is increasing at an amazing rate. Among the inorganic nanotubes, titanium oxide nanotubes are very attractive because these nanostructures are promising for applications as photocatalysts, UV absorbers, dye-sensitizing solar cells, self-cleaning devices, and catalyst supports. 6,7 Kasuga et al. 8 reported the preparation of titanium oxide nanotubes through hydrothermal treatment of TiO 2 -SiO 2 powders in aqueous NaOH solutions. This preparation method is very simple and inexpensive. However, a great debate has been established in the literature regarding the formation mechanism, compo...

show abstract

Section: Thermal Decomposition Of Titanate Nanotubesmentioning

confidence: 99%

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

Ferreira¹,

Filho²,

Filho³

et al. 2006

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…In recent years, sodium trititanate (Na 2 Ti 3 O 7 ) has received considerable attention due to its potential technological applications in various fields such as ion exchangers [1], photocatalysts [1][2][3][4], electrodes for secondary batteries [5], bioactive ceramics [6] and sensors [7]. Generally, it can * E-mail: junshen@hit.edu.cn be synthesized by solid state reactions [8] from TiO 2 and Na 2 CO 3 or by sol-gel methods [9].…”

Section: Introductionmentioning

confidence: 99%

First-principle calculations for electronic structure and bonding properties in layered Na2Ti3O7

Xiang

et al. 2011

Open Physics

View full text Add to dashboard Cite

Ê Ú ¾¼ Å Ö ¾¼½½ ÔØ ¾ ÂÙÐÝ ¾¼½½ ×ØÖ ØFirst-principles calculations of Na 2 Ti 3 O 7 have been carried out with density-functional theory (DFT) and ultrasoft pseudopotentials. The electronic structure and bonding properties in layered Na 2 Ti 3 O 7 have been studied through calculating band structure, density of states, electron density, electron density difference and Mulliken bond populations. The calculated results reveal that Na 2 Ti 3 O 7 is a semiconductor with an indirect gap and exhibits both ionic and covalent characters. The stability of the (Ti 3 O 7 ) 2− layers is attributed to the covalent bonding of strong interactions between O 2p and Ti 3d orbitals. Furthermore, the O atoms located in the innerlayers interact more strongly with the neighboring Ti atoms than those in the interlayer regions. The ion-exchange property is due to the ionic bonding between the Na + and (Ti 3 O 7 ) 2− layers, which can stabilize the interlayers of layered Na 2 Ti 3 O 7 structure.

show abstract

“…Sauvet et al [19] proposed that at higher temperatures sodium trititanates tend to fuse and the formation of Na 2 Ti 6 O 13 is the result of ''dimerization like'' process of Na2Ti3O7. The presence of Na2Ti6O13 in the thermal products can be considered as strong evidence that the structure and composition of titanate compound and a general formula may be assigned as Na2-xHxTi3O7.…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity

Razali¹,

Osman²,

Rozaini³

et al. 2017

Asian J. Chem.

View full text Add to dashboard Cite

Thermal stability on morphology and crystal structure of hydrothermally synthesized titanates nanotubes was investigated. Morphology study by FESEM and TEM revealed that the synthesized titanate nanotubes retained up to 500 °C before converted into nanowires and nanorods at 600 and 700 °C, respectively. The crystal structure of sodium trititanate nanotubes remained unchanged upon thermal treatment from 300 to 500 °C. However at 600 and 700 °C, the interlayer titanate in sodium trititanate samples undergo dimerization like process leading to the formation of an intermediate nanostructured hexatitanate, just before transformed into the corresponding anatase TiO2 crystals. Titanate nanotubes either trititanate or hexatitanate show low photocatalytic activity for methyl orange degradation due to their inter-layered crystal structure.

show abstract

Synthesis and characterization of sodium titanates Na2Ti3O7 and Na2Ti6O13

Cited by 114 publications

References 18 publications

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

Unveiling the structure and composition of titanium oxide nanotubes through ion exchange chemical reactions and thermal decomposition processes

First-principle calculations for electronic structure and bonding properties in layered Na2Ti3O7

Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity

Contact Info

Product

Resources

About