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Method for controllably synthesizing alkali metal titanate nanowires and converting alkali metal titanate nanowires into titanium dioxide nanowires

A technology for synthesizing titanate and titanium dioxide, which is applied in the direction of alkali metal titanate, titanium dioxide, chemical instruments and methods, etc., can solve the problems of reducing the lifetime of photogenerated electrons, achieve reduced pressure resistance requirements, good crystallinity, and low cost Effect

Inactive Publication Date: 2017-09-29
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the diameter of nanowires is large, usually up to hundreds of nanometers, and it is a polycrystalline material. Excessive grain boundaries reduce the lifetime of photogenerated electrons during the diffusion process.

Method used

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  • Method for controllably synthesizing alkali metal titanate nanowires and converting alkali metal titanate nanowires into titanium dioxide nanowires
  • Method for controllably synthesizing alkali metal titanate nanowires and converting alkali metal titanate nanowires into titanium dioxide nanowires
  • Method for controllably synthesizing alkali metal titanate nanowires and converting alkali metal titanate nanowires into titanium dioxide nanowires

Examples

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Embodiment 1

[0035] Anatase TiO 2 The molar ratio of powder to potassium hydroxide is 1:5. First, take 2 mmol of anatase in a mortar and grind for ten minutes. Then add KOH, continue to grind for about 30 minutes until it becomes viscous, transfer the mixture to a stainless steel reaction kettle with a polytetrafluoroethylene liner, and keep it at 150°C for 24h. Cool to room temperature, wash with distilled water and ethanol three times alternately. The washed product was placed in an oven at 60°C and dried for 12 hours to obtain KTiO 2 (OH) nanomaterials.

[0036] The prepared precursor KTiO 2 The X-ray powder diffraction spectrum of (OH) is as attached figure 1As shown in a, corresponding to KTiO 2 (OH) (ICSD 94776). The EDS spectrum is attached figure 1 As shown in b and 1c, the atomic ratio of K, Ti, and O is 1:1.07:3.21, which is close to the stoichiometric composition of the product. Infrared Spectrum (attached figure 1 d) at 3490cm -1 There is an O-H stretching vibration p...

Embodiment 2

[0038] With the KTiO that embodiment 1 obtains 2 (OH), calcined at 530°C for 2h in a tube furnace to obtain K 2 Ti 2 o 5 Nanowires. The collected product was dissolved in 0.1mol·L -1 Stir in hydrochloric acid solution, acidify for 2 hours, and calcinate for 2 hours at 400°C in a tube furnace to obtain the final product TiO 2 Nanowires.

[0039] as attached image 3 As shown, K 2 Ti 2 o 5 Nanowires hold KTiO well 2 (OH) nanowire morphology, the corresponding product phase is K 2 Ti 2 o 5 (JCPDS Card 76-1628).

[0040] as attached Figure 4 As shown, K 2 Ti 2 o 5 After acidification, K is still well maintained 2 Ti 2 o 5 The nanowire morphology, and the corresponding product is H 2 Ti 2 o 5 .H 2 O (JCPDS Card 47-0124).

[0041] h 2 Ti 2 o 5 .H 2 O nanowires are calcined to obtain TiO 2 Nanowires. The XRD of the calcined product is as attached Figure 5 As shown, TiO in the anatase phase 2 (JCPDS Card 21-1272), and good crystallinity. attached by...

Embodiment 3

[0043] The reaction conditions are the same as in Example 1, except that the molar ratios of anatase and potassium hydroxide are set to 1:3, 1:4, and 1:6. After the reaction, it was cooled to room temperature, washed with distilled water and ethanol three times alternately, and dried in an oven at 60° C. for 12 hours to obtain a titanate precursor. The morphology and XRD of the prepared precursor are shown in the attached Figure 8 shown. When the reaction stoichiometric ratio n(KOH):n(TiO 2 ) is 1:3, only some short nanorods are formed, and it can be seen in XRD that these nanorods correspond to K 2 Ti 8 o 17 (JCPDS Card41-1100); When the reaction stoichiometric ratio is 1:4, nanowires with a diameter of about 30nm and a length of about tens of nanowires can be seen, but it can be seen as K in the XRD diffraction peak 2 Ti 8 o 17 (JCPDS Card 41-1100) and KTiO 2 (OH) (ICSD94776) mixed phase; when the reaction stoichiometric ratio is 1:6, it corresponds to the previousl...

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Abstract

The invention provides a method for controllably synthesizing alkali metal titanate nanowires and converting the alkali metal titanate nanowires into titanium dioxide nanowires. The method comprises the following steps: (1) taking anatase and putting the anatase in a grinding mortar for grinding, adding alkali metal hydroxides and grinding the mixture till the mixture is viscous; (2) transferring the mixture into a reaction kettle, reacting under different temperatures, cooling to the room temperature after the reaction is ended, and alternately washing via distilled water and alcohol and drying to obtain titanate nanowires; (3) calcining the products obtained by the reaction in a tubular furnace to obtain alkali metal titanate nanowires; and (4) stirring and acidizing the collected products in a hydrochloric acid solution, and calcining the products in the tubular furnace to obtain the final products which are TiO2 nanowires. The titanate nanowires prepared by the method can be applied to the fields such as lithium ion batteries and photoelectric conversion; TiO2 obtained by thermal decomposition retains the shape of the nanowires, has high crystallinity, high specific surface area and certain pore structures, and can be applied to the fields such as photocatalysts, photoelectric conversion and storage devices, biomedicine and sensors.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials. It specifically involves the controllable synthesis of alkali metal titanate nanomaterials, which are acidified and heat treated to obtain TiO 2 nanowire method. The invention is expected to be applied to the fields of lithium ion batteries, photocatalysts, photoelectric conversion and storage devices, biomedicine, sensors, nanometer materials and composite materials. Background technique [0002] Alkali metal titanates occupy an important position in the field of materials science because of their good mechanical and physical and chemical properties, and have been extensively studied. Based on the unique structural characteristics of alkali metal titanate nanomaterials, it has extremely high ion exchange, transport and adsorption capabilities, and has broad application prospects in lithium-ion batteries; in addition, due to the conductivity of alkali metal titanate, it can It can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G23/07C30B29/10C30B29/62B82Y30/00B82Y40/00
CPCC01G23/005B82Y30/00B82Y40/00C01G23/07C01P2002/72C01P2004/03C01P2004/04C01P2004/16C01P2004/40C30B29/10C30B29/62
Inventor 郑文君靳岑李春刚鹿秀山
Owner NANKAI UNIV
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