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

Ferreira, Odair P.; Filho, A. G. Souza; Filho, J. Mendes; Alves, Oswaldo Luiz

doi:10.1590/s0103-50532006000200025

Cited by 98 publications

(105 citation statements)

References 28 publications

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Section: Introductionmentioning

confidence: 99%

“…15 Thus, as-prepared nanotubes will most likely correspond more closely to the sodium titanate Na 2 Ti 3 O 7 structure. 16,17 The most acceptable composition of the as-prepared nanotubes is Na 2-x H x Ti 3 O 7 •nH 2 O (0 ≤ x ≤ 2), where the sodium content can vary according to the washing conditions (acid solutions or pure water). 16 In view of the many technological applications of the titanate nanotubes, understanding their chemical, structural and morphological stabilities in several media and their thermal stabilities under several kinds of treatments is an important issue.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 The most acceptable composition of the as-prepared nanotubes is Na 2-x H x Ti 3 O 7 •nH 2 O (0 ≤ x ≤ 2), where the sodium content can vary according to the washing conditions (acid solutions or pure water). 16 In view of the many technological applications of the titanate nanotubes, understanding their chemical, structural and morphological stabilities in several media and their thermal stabilities under several kinds of treatments is an important issue. [18][19][20][21][22][23][24] Furthermore, the knowledge of the surface properties of such nanostructured materials is a key point for understanding their reactivity, and potentializing their technological applications.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 The most acceptable composition of the as-prepared nanotubes is Interaction of Sodium Titanate Nanotubes with Organic Acids and Base…”

mentioning

confidence: 99%

“…16 The band at 470 cm -1 is related to Ti-O-Ti vibrations of the interconnected octahedra that are rigid units responsible for the formation of the nanotube walls. 16 The products obtained after the interaction of Na-TiNT with phenylphosphonic acid, using different process parameters, presented new bands in the FTIR spectra. The same spectral features were observed for all products, so that we show here only the FTIR spectrum for the sample obtained for 48 h at 100 º C (curve b in Figure 1).…”

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Interaction of sodium titanate nanotubes with organic acids and base: chemical, structural and morphological stabilities

Rodrigues¹,

Ferreira²,

Alves³

2010

J. Braz. Chem. Soc.

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Este trabalho relata a interação de nanotubos de titanato de sódio (Na-TiNT) com soluções aquosas de ácido benzóico, ácido fenilfosfônico e anilina. Os Na-TiNT foram obtidos através do tratamento hidrotérmico de TiO 2 em solução aquosa de NaOH. Os resultados obtidos através de FTIR, XRD, TEM e análise elementar mostraram que a estabilidade química, estrutural e morfológica dos nanotubos está relacionada à natureza química do meio (básico ou ácido) e às condições de tratamento (temperatura e tempo de contato). A fase α-fenilfosfonato de titânio(IV) foi formada a partir da interação dos Na-TiNT com ácido fenilfosfônico; a quantidade da nova fase foi dependente do tempo de contato e sua cristalinidade da temperatura. Porém, TiO 2 ou nanotubo de titanato contendo H + foram obtidos, em função das condições de tratamento, a partir da interação dos Na-TiNT com ácido benzóico. Quando os Na-TiNT interagiram com a anilina nenhuma mudança estrutural, morfológica ou composicional foi observada.This work reports the interaction of sodium titanate nanotubes (Na-TiNT) with aqueous solutions of benzoic and phenylphosphonic acids and of aniline. The Na-TiNT were obtained from hydrothermal treatment of TiO 2 in aqueous NaOH solution. The results obtained from FTIR, XRD, TEM and elemental analyses showed that the chemical, structural and morphological stability of the nanotubes is related to the medium (acidic or basic) and to the treatment conditions (temperature and contact time). A titanium(IV) α-phenylphosphonate phase was obtained from interaction between Na-TiNT and phenylphosphonic acid. The amount and crystallinity of the new phase were dependent of the contact time and temperature, respectively. On the other hand, TiO 2 or protonrich titanate nanotubes were formed, depending on treatment conditions, from interaction between Na-TiNT and benzoic acid. When Na-TiNT interacted with aniline, no chemical, morphological or compositional change was observed.Keywords: titanium oxide, titanium oxide nanotubes, phase transformation, adsorption, carboxylic acid IntroductionIntensive investigation on physical and chemical properties of inorganic one-dimensional (1D) nanostructures such as nanotubes, nanofibers and nanorods has been reported. 1 In particular, titanate nanotubes have attracted great attention from the scientific community due to their potential applications in biosensors, electronic, optical, magnetic, electrochromic and solar cell devices, as well as in heterogeneous photocatalysis. [2][3][4][5][6][7][8][9] Additionally, 1D titanate nanostructures have also been used as support for the immobilization of myoglobin, 10 and as host for platinum oxide and lithium intercalation. 11,12 Titanate nanotubes can be prepared by hydrothermal treatment of TiO 2 powders (anatase or rutile) in aqueous NaOH solutions. 13,14 Although the preparation method is very simple, there is still a great debate in the literature related to the atomic structure and chemical composition of the nanotubes produced by this method. The exact determina...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…16,17 The most acceptable composition of the as-prepared nanotubes is Interaction of Sodium Titanate Nanotubes with Organic Acids and Base…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Interaction of sodium titanate nanotubes with organic acids and base: chemical, structural and morphological stabilities

Rodrigues¹,

Ferreira²,

Alves³

2010

J. Braz. Chem. Soc.

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Highly Efficient, Irreversible and Selective Ion Exchange Property of Layered Titanate Nanostructures

Li¹,

Zhang²,

Chen³

et al. 2011

Adv Funct Materials

234

133

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Layered titanates (Na2Ti3O7·nH2O) with exchangeable sodium cations located in the interlayer have been synthesized by simple hydrothermal treatment of Ti precursor in concentrated NaOH solutions. By proper control of the synthesis conditions, different morphologies of nanofibers and nanosheets are obtained. The metastable layered structure of the titanates collapses during the ion exchange, resulting in irreversible ion exchange. Target cations (eg., Ag+, Cu2+, Pb2+ and Eu3+) are completely concentrated from water and then tightly immobilized in the interlayer which is of great significance for the removal and subsequent safe disposal of hazardous metal cations. The ion exchange of the nanosheets is much more efficient than that of the nanofibers and other inorganic ion exchangers due to the larger surface area, less stable layered structure and larger amount of interlayer water of the nanosheets. The ion exchange of the titanates is also very selective. Valence, hardness, and radius of cations are main factors affecting the selectivity. Cations trapped in the interlayer are released by an acid‐induced phase transformation of the titanate nanosheets to rutile. Then the rutile can be used as a new Ti precursor to synthesize the titanate nanostructures, resulting in a full cycle of material use. The nanosheets may find applications in the decontamination and safe disposal of radioactive and heavy metal cations and also in the collection of valuable cations from water.

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Elongated Titanate Nanostructures and Their Applications

2009

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Recent advances in the synthesis, characterisation and applications of elongated titanate and TiO2 nanostructures (including nanotubes, nanofibres and nanorods) are reviewed. The physicochemical properties of nanostructures, such as high surface area, efficient ion‐exchange properties, electron and proton conductivity and high aspect ratio, are described in connection with a particular application. Practical aspects of the preparation, stability and transformation of elongated titanates are considered. A critical survey of the literature is provided together with the development of prospectiveenergy applications of elongated titanates in catalysis, photocatalysis, electrocatalysis, solar cells, fuel cells, lithium batteries and hydrogen storage. Other applications utilising the high aspect ratio of elongated nanostructures include biomedical implants, sensors, drug delivery systems and smart, tribological composite coatings. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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

Cited by 98 publications

References 28 publications

Interaction of sodium titanate nanotubes with organic acids and base: chemical, structural and morphological stabilities

Interaction of sodium titanate nanotubes with organic acids and base: chemical, structural and morphological stabilities

Highly Efficient, Irreversible and Selective Ion Exchange Property of Layered Titanate Nanostructures

Elongated Titanate Nanostructures and Their Applications

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