Application of an Ion-Exchange Model to the Synthesis of Fibrous Titanate Derivatives

He, Meiyu; Feng, Xin; Lu, Xiao; Ji, Xiao Yan; Liu, Chang; Bao, Ning; Xie, Jing Wei

doi:10.1252/jcej.36.1259

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…During this process, a water gradient developed between solution/solid interface and interior of the fiber. Depending on synthesis conditions and available water, different titanates can be formed as in eqs and and via different phase transformation routes. , The XRD spectrum of the acid treated intermediate product dried at 120 °C for 12 h was compared with that of the precursor in Figure . Diffraction patterns correspond to both H 2 Ti 2 O 5 ·H 2 O and H 2 Ti 5 O 11 ·H 2 O were identified clearly in the acid treated titanate.…”

Section: Resultsmentioning

confidence: 99%

“…Depending on synthesis conditions and available water, different titanates can be formed as in eqs 2 and 3 and via different phase transformation routes. 46,47 The XRD spectrum of the acid treated intermediate product dried at 120 °C for 12 h was compared with that of the precursor in Figure 8…”

Section: Formation Mechanism Of the Coherent Bicrystalline Interfacia...mentioning

confidence: 99%

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Enhanced Photocatalytic Activity in Anatase/TiO₂(B) Core−Shell Nanofiber

et al. 2008

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A bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K 2 Ti 2 O 5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO 2 (B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO 2 (B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2 (B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50% increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO 2 (B) nanofibers. Anatase and TiO 2 (B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO 2 (B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO 2 (B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials.

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Section: Resultsmentioning

confidence: 99%

Section: Formation Mechanism Of the Coherent Bicrystalline Interfacia...mentioning

confidence: 99%

Enhanced Photocatalytic Activity in Anatase/TiO₂(B) Core−Shell Nanofiber

et al. 2008

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“…Given the problem of the complex effects of these factors on the ion-exchange process of K 2 Ti 4 O 9 , on the basis of the experimental information about the intermediate products and potassium ion titration curves reported by Sasaki [32], we first combined the mass balance equation with the ion-exchange equilibrium equation to correlate the equilibrium constants. Then multi-stage ionexchange equilibrium models were established in order to study the thermodynamics of the ion-exchange process systematically, and to study the influence of factors such as acid concentration, composition of the solid phase and initial amount of water [31,33,34] on the ion-exchange process. The results showed that the pH value of the solution and the initial amount of water are the key operating parameters controlling the molar ratio of TiO 2 to K 2 O in the products.…”

Section: Control Of the Ion-exchange Rate In The Synthesis Of Potassimentioning

confidence: 99%

Non-equilibrium thermodynamics analysis and its application in interfacial mass transfer

Lü

Liu

2011

Sci. China Chem.

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Interfacial transfer plays an important role in multi-phase chemical processes. However, it is difficult to describe the complex interfacial transport behavior by the traditional mass transfer model. In this paper, we describe an interfacial mass transfer model based on linear non-equilibrium thermodynamics for the analysis of the rate of interfacial transport. The interfacial transfer process rate J depends on the interface mass transfer coefficient K, interfacial area A and chemical potential gradient  at the interface. Potassium compounds were selected as model systems. A model based on linear non-equilibrium thermodynamics was established in order to describe and predict the transport rate at the solid-solution interface. Together with accurate experimental kinetic data for potassium ions obtained using ion-selective electrodes, a general model which can be used to describe the dissolution rate was established and used to analyze ways of improving the process rate. chemical engineering, non-equilibrium thermodynamics, interface transport, process rate

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