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Trigonal structure potassium titanate and its preparing method

A single technology of potassium titanate, applied in the field of trigonal structure potassium titanate and its preparation, can solve problems such as unreported trigonal structure potassium titanate compound, avoid powder agglomeration and impurity introduction, simple process, reduce powder The effect of body synthesis temperature

Inactive Publication Date: 2007-03-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, no tripartite potassium titanate compound has been reported at home and abroad.

Method used

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  • Trigonal structure potassium titanate and its preparing method
  • Trigonal structure potassium titanate and its preparing method
  • Trigonal structure potassium titanate and its preparing method

Examples

Experimental program
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Embodiment 1

[0021] ① Raw material preparation: anatase TiO 2 , KOH and deionized water were all analytically pure. 1.146gTiO 2 Mix evenly with 27.374gKOH, and add deionized water at the same time to make it a volume of 29m1; ②Charging: Put the uniformly mixed raw materials into a 50ml stainless steel reaction kettle with a polytetraethylene liner, and tighten the seal; ③Water Thermal reaction: put the reaction kettle into a program-controlled oven, conduct a hydrothermal reaction at 160°C for 12hrs, heat up at a rate of 3°C / min., and cool with the furnace; ④Product treatment: ultrasonic dispersion for 30min., washed with deionized water for 10 times, without Disperse with water and ethanol, and dry at 80°C for 24hrs.

[0022] The rod crystals of potassium titanate obtained above have a diameter of about 10 μm, a length of about 50 μm, an aspect ratio of about 5, and a uniform particle size distribution, as shown in FIG. 2 .

Embodiment 2

[0024] ① Raw material preparation: metal Ti powder, KOH and deionized water are all analytically pure. Fully mix 1.305g of Ti powder and 85.428g of KOH with deionized water, the total water content is 33.4% (wt%); ② Loading: put the uniformly mixed raw materials into 120ml stainless steel with polytetraethylene liner ③Hydrothermal reaction: Put the reaction kettle into a program-controlled oven, 200℃ hydrothermal reaction for 48hrs, heating rate 3℃ / min, and cool with the furnace; ④Product treatment: Ultrasonic dispersion for 30min, Wash with deionized water to pH = 7, disperse with absolute ethanol, and dry in an oven at 80°C for 24hrs.

Embodiment 3

[0026] ① Raw material preparation: TiO 2 , KOH and deionized water were all analytically pure. 1.837g TiO 2 Mix evenly with 12.904g KOH, and add appropriate amount of deionized water at the same time to make the volume 23ml; ②Charging: Put the uniformly mixed raw materials into a PTFE-lined, 30ml stainless steel reaction kettle, tighten and seal ;③ Hydrothermal reaction: put the reactor into a program-controlled oven, conduct a hydrothermal reaction at 200°C for 6hrs, heat up at a rate of 3°C / min, and cool with the furnace; ④Product treatment: Ultrasonic dispersion for 30min, washing with deionized water 10 times, Disperse with absolute ethanol and dry at 80°C for 24hrs.

[0027] The average diameter of the potassium titanate nanofibers obtained above is about 20-50 nm, and the aspect ratio is 10-120, as shown in FIG. 3 .

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Abstract

The present invention provides trigonal structure potassium titanate and its preparation process, and belongs to the field of new type of inorganic functional material. The trigonal structure potassium titanate has the molecule expression of KTiO2(OH), with space group of R-3c. During the preparation, single metal titanium or its compound and potassium hydroxide as material and deionized water are filled in reactor in the filling rate of 50-85 % and made to produce hydrothermal reaction at 100-200 deg.c for 2-48 hr. The solution of single metal titanium or its compound has concentration of 0.4-3 mol / L and KOH solution has concentration of 10-40 mol / L. The produced trigonal structure potassium titanate may be used as functional ceramic crystal see, ferroelectric ceramic, cationic adsorbent, exchange material, catalyst carrier, etc.

Description

technical field [0001] The invention relates to potassium titanate with a tripartite structure and a preparation method thereof, belonging to the field of inorganic functional materials. Background technique [0002] Potassium titanate whisker is an inorganic short fiber material, usually with K 2 O nTiO 2 (n=1, 2, 4, 6, 8) to represent its composition. [0003] in TiO 2 -K 2 In the O system, there are currently three stable crystal states of potassium dititanate, potassium tetratitanate and potassium hexatitanate, all of which are monoclinic crystals with the same space group (C2 / m). K 2 Ti 2 o 5 The crystal structure of whiskers can be obtained with TiO 5 The triangular two-pyramids indicated that the triangular pyramids are connected to each other to form a layered structure, and potassium ions reside between the layers and are parallel to the fiber axis. K 2 Ti 4 o 9 The crystal structure of the whiskers is TiO 6 The octahedral edges and corners are shared a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00C04B35/462
Inventor 杨群保李永祥殷庆瑞
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI