Role of an intermediate phase in solid state reaction of hydrous titanium oxide with potassium carbonate

Liu, Chang; Lü, Xiaohua; Yu, Gang; Feng, Xin; Zhang, Qitu; Xu, Zhongzi

doi:10.1016/j.matchemphys.2005.05.022

Cited by 35 publications

(18 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Depending on the initial materials, this peak slightly shifts (Ti-series: 280 cm −1 , TAV-series: 284 cm −1 , TN-series: 273 cm −1 ). Besides, Raman peaks of various TiO 2 phases could be found at higher values, namely for Ti series (442, 657, 815, and 917 cm −1 ), TAV series (446, 666, and 920 cm −1 ), and TN series (442 and 722 cm −1 ) [53,54,55]. The peaks at about 442 and 446 cm −1 were assigned to the Ti–O bending vibration involving three-fold oxygen coordination, whereas the peaks at about 657, 666, 722, 815 cm −1 were assigned to the Ti–O bending and stretching vibration involving two-fold oxygen coordination.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4 summarizes the evolution of the Raman peak intensities as a function of the KOH concentrations for the different samples. To be precise, for this estimate the relative intensities of the Ti–O–K contributions (Ti series: 280 cm −1 , TAV series: 284 cm −1 , TN series: 173, and 273 cm −1 ) and that of the various Ti–O phases (Ti series: 442, 657, 815, and 917 cm −1 , TAV series: 446, 666, 827, and 920 cm −1 , TN series: 722 cm −1 ) have been taken into account for both components, respectively [53,54,55]. As can be seen, the intensities clearly increase with higher concentration of the KOH solution for all different substrate materials.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Lee

Kim

et al. 2015

Nanomaterials

View full text Add to dashboard Cite

Nanostructured potassium-incorporated Ti-based oxides have attracted much attention because the incorporated potassium can influence their structural and physico-chemical properties. With the aim of tuning the structural and physical properties, we have demonstrated the wet corrosion process (WCP) as a simple method for nanostructure fabrication using various Ti-based materials, namely Ti–6Al–4V alloy (TAV), Ti–Ni (TN) alloy and pure Ti, which have 90%, 50% and 100% initial Ti content, respectively. We have systematically investigated the relationship between the Ti content in the initial metal and the precise condition of WCP to control the structural and physical properties of the resulting nanostructures. The WCP treatment involved various concentrations of KOH solutions. The precise conditions for producing K-incorporated nanostructured titanium oxide films (nTOFs) were strongly dependent on the Ti content of the initial metal. Ti and TAV yielded one-dimensional nanowires of K-incorporated nTOFs after treatment with 10 mol/L-KOH solution, whereas TN required a higher concentration (20 mol/L-KOH solution) to produce comparable nanostructures. The obtained nanostructures revealed a blue-shift in UV absorption spectra due to the quantum confinement effects. A significant enhancement of the photocatalytic activity was observed via the chromomeric change and the intermediate formation of methylene blue molecules under UV irradiation. This study demonstrates the WCP as a simple, versatile and scalable method for the production of nanostructured K-incorporated nTOFs to be used as high-performance photocatalysts for environmental and energy applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Lee

Kim

et al. 2015

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…1, an obvious change in the diffraction patterns does not appear after the molten salt treatment. These results suggest that the nano-lamellar compounds are probably amorphous [27].…”

Section: Resultsmentioning

confidence: 76%

Fabrication of the photocatalyst thin films of nano-structured potassium titanate by molten salt treatment and its photocatalytic activity

Takaya

Miyazawa

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

“…Preparation of initial materials K 2 Ti 4 O 9 whiskers were prepared by a controlled calcination method. 17,18 First, anhydrous K 2 CO 3 was mixed with anatase TiO 2 nanoparticles at a molar ratio of n(TiO 2 )/n(K 2 CO 3 ) ¼ 3. Then 2.883 kg of K 2 CO 3 was completely dissolved in 2.5 L deionized water.…”

Section: Methodsmentioning

confidence: 99%

Scalable synthesis of high-purity TiO₂ whiskers via ion exchange method enables versatile applications

et al. 2019

View full text Add to dashboard Cite

In this work, high-purity titanium dioxide (TiO 2 ) whiskers with different crystal forms were synthesized via ion exchange and controlled calcination methods. TiO 2 whiskers are of 5-10 mm in length with a lengthto-diameter ratio of 10-20. A systematic investigation was established to explore the hydration process of K + /H + exchange, anatase-rutile transformation in the calcination process and the applications of TiO 2 whiskers. Compared with the other strategies previously used for the synthesis of TiO 2 whiskers, it was found that large-scale production was obtained under mild reaction conditions, which represented a facile and mild route for industrial production and expanded the versatile applications of TiO 2 whiskers. Moreover, with the addition of nano TiO 2 colloid as a special accelerant, the calcination process yielding uniform morphology and controllable crystal form was explored. Confirmatory experiments indicated that anatase and rutile TiO 2 whiskers respectively show excellent photocatalytic activities and unique carrier performance for fabricating functional whiskers.

show abstract

Role of an intermediate phase in solid state reaction of hydrous titanium oxide with potassium carbonate

Cited by 35 publications

References 23 publications

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Fabrication of the photocatalyst thin films of nano-structured potassium titanate by molten salt treatment and its photocatalytic activity

Scalable synthesis of high-purity TiO₂ whiskers via ion exchange method enables versatile applications

Contact Info

Product

Resources

About

Role of an intermediate phase in solid state reaction of hydrous titanium oxide with potassium carbonate

Cited by 35 publications

References 23 publications

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Preparation and Photocatalytic Activity of Potassium- Incorporated Titanium Oxide Nanostructures Produced by the Wet Corrosion Process Using Various Titanium Alloys

Fabrication of the photocatalyst thin films of nano-structured potassium titanate by molten salt treatment and its photocatalytic activity

Scalable synthesis of high-purity TiO2 whiskers via ion exchange method enables versatile applications

Contact Info

Product

Resources

About

Scalable synthesis of high-purity TiO₂ whiskers via ion exchange method enables versatile applications