Effects of sodium content on the microstructures and basic dye cation exchange of titanate nanotubes

Lee, Chung‐Kung; Wang, Cheng-Cai; Juang, Lain-Chuen; Lyu, Meng-Du; Hung, Shui-Hung; Liu, Shin-Shou

doi:10.1016/j.colsurfa.2007.10.008

Cited by 63 publications

(29 citation statements)

References 36 publications

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“…Unfortunately, there is only limited amount of published, systematic works [25] showing the effect of the surface charge on dye molecules on their ability to adsorb on the surface of titanate nanotubes. Such studies would help to improve the performance of dye sensitized cells, by tailored selection of a dye with a higher affinity towards the surface of titanate nanotubes, as compared to previous studies in which negatively charged dyes were characterized by a limited adsorption on the surface of nanotubes.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

et al. 2010

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The adsorption of dye molecules from aqueous solution onto the surface of titanate nanotubes (which have been synthesized via an alkaline hydrothermal treatment) has been studied. The ionic charge on the dye molecules was found to affect their ability to adsorb onto the titanate nanotube surface. In the case of (cationic) methylene blue, the adsorption was preferable on the negatively charged surface of titanate nanotubes rather than on positively charged P25 TiO 2 nanoparticles. In the case of (anionic) Eriochrome Black T dye, the opposite trend was found. Herein, the dynamics of dye adsorption and the effect of pH on the adsorption capacity are considered.

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Section: Introductionmentioning

confidence: 99%

The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

et al. 2010

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“…Examples include the use of high-surface-area elongated titanates as low-cost adsorbents for chromatography [47,210] and for dye removal from wastes of stained fabrics in the textile industry. [168] The high surface area and the acidic nature of nanotubular titanate surfaces also render these materials useful as a coating for quartz crystal microbalance devices. For example, various amines have been detected in the gas phase, which is relevant to the monitoring of chemical warfare agents.…”

Section: Other Applicationsmentioning

confidence: 99%

“…The potential advantage of titanate nanotubes as electrodes for DSSCs can be realised by utilising the phenomenon of better (relative to TiO 2 NP) adsorption of the positively charged dyes from aqueous solution on the surface of negatively charged titanate nanotubes, [168] allowing a compact monolayer of dye to be deposited with a capacity of over 1000 molecules per nanotube. Such a dense loading of dye would allow the thickness of the light-absorbing layer of the electrode to be reduced from typical values of several microns to much lower values and decrease the electron diffusion distance, which would potentially improve the charge collection.…”

Section: Solar Cellsmentioning

confidence: 99%

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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“…Adsorption-related applications of TNTs derived from hydrothermal method depend on the cation exchange properties, the availability of internal pore volume, and the surface hydrophilicity of TNTs, that are all easily affected by the synthetic conditions, including reaction time, synthesis temperature, acid concentration during washing, and calcination temperature (Kasuga 2006;Lee et al 2007aLee et al , 2007bLee et al , 2008aLee et al , 2008bWeng et al 2006;Yoshida et al 2005;Yu et al 2006aYu et al , 2006b. With the caion-exchange property and high specific pore volume, TNTs may offer a special environment for adsorption of cations, such as basic dyes and heavy metal ions, through the cation exchange mechanism (Lee et al 2007a(Lee et al , 2007b(Lee et al , 2008aLiu et al 2009;Nie and Teh 2010;Xiong et al 2010;Sheng et al 2011;Huang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of pore structure and surface chemical characteristics on the adsorption of organic vapors on titanate nanotubes

et al. 2012

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Effects of pore structure and surface chemical characteristics of titanate nanotubes (TNTs) on their adsorptive removal of organic vapors were investigated. TNTs were prepared via a hydrothermal treatment of TiO 2 powders in a 10 M NaOH solution at 150°C for 24 h, and subsequently washed with HCl aqueous solution of different concentrations. Effects of acid washing process (or the sodium content) on the microstructures and surface chemical characteristics of TNTs were characterized with nitrogen adsorption-desorption isotherms, FTIR, and water vapor adsorption isotherms. For the adsorption experiments, gravimetric techniques were employed to determine the adsorption capacities of TNTs for four organic vapors with similar heats of vaporization (i.e., comparable heats of adsorption) but varying dipole moments and structures, including n-hexane, cyclohexane, toluene, and methyl ethyl ketone (MEK), at isothermal conditions of 20 and 25°C. The experimental data were correlated by well-known vapor phase models including BET and GAB models. Isosteric heats of adsorption were calculated and heat curves were established. Equilibrium isotherms of organic vapors on TNTs were type II, characterizing vapor condensation to form multilayers. The specific surface area (and pore volume) and hydrophilicity of TNTs were the dominating factors for the determination of their organic vapors adsorption capacity. The GAB isotherm equation fitted the experimental data more closely than the BET equation. The heats of adsorption showed that the adsorption of organic vapors on TNTs was primarily due to physical forces and adsorbates with larger polarity might induce a stronger interaction with TNTs.

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Effects of sodium content on the microstructures and basic dye cation exchange of titanate nanotubes

Cited by 63 publications

References 36 publications

The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

The Effect of Ionic Charge on the Adsorption of Organic Dyes onto Titanate Nanotubes

Elongated Titanate Nanostructures and Their Applications

Effects of pore structure and surface chemical characteristics on the adsorption of organic vapors on titanate nanotubes

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