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Preparation process of one-dimensional pyromelane nanometer titanium dioxide

A technology of titanium dioxide and brookite, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., to achieve the effect of simple preparation process, wide parameter adjustable range and high purity

Inactive Publication Date: 2009-08-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of high-purity brookite-type titanium dioxide nanorods by one-step hydrothermal method has not been reported.

Method used

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  • Preparation process of one-dimensional pyromelane nanometer titanium dioxide
  • Preparation process of one-dimensional pyromelane nanometer titanium dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 8 ml of isopropyl titanate and 1.50 g of sodium chloride were added to 65 ml of ammonia water with a mass fraction of 20%, and the isopropyl titanate was rapidly hydrolyzed while stirring vigorously to mix them uniformly. Then the suspension was put into a Teflon-lined stainless steel autoclave and reacted at 433K for 48 hours. After the reaction, the precipitated product was washed with a large amount of deionized water and dilute hydrochloric acid, and then dried under normal pressure at 363K for 12 hours to obtain brookite-type titanium dioxide nanorods.

[0022] The prepared nano-rods are in the shape of multiple aggregated flowers, the diameter of a single nano-rod is 20-50 nanometers, the length is 500-2500 nanometers, and the purity is over 99%.

Embodiment 2

[0024] 5 ml of isopropyl titanate and 0.55 g of potassium chloride were directly added to 50 ml of ammonia water with a mass fraction of 10%, and the isopropyl titanate was rapidly hydrolyzed while stirring vigorously to mix them uniformly. Then the suspension was put into a Teflon-lined stainless steel autoclave and reacted at 393K for 72 hours. After the reaction, the precipitated product was washed with a large amount of deionized water and dilute hydrochloric acid, and then dried under normal pressure at 353K for 18 hours to obtain brookite-type titanium dioxide nanorods.

[0025] The prepared nano-rods are in the shape of multiple aggregated flower bouquets, the diameter of a single nano-rod is 20-50 nanometers, the length is 500-1500 nanometers, and the purity is over 99%.

Embodiment 3

[0027] 7 ml of isopropyl titanate and 4.60 g of barium chloride were directly added to 55 ml of ammonia water with a mass fraction of 25%, and the isopropyl titanate was rapidly hydrolyzed while stirring vigorously to mix them uniformly. Then the suspension was put into a Teflon-lined stainless steel autoclave and reacted at 423 K for 48 h. After the reaction, the precipitated product was washed with a large amount of deionized water and dilute hydrochloric acid, and then dried under normal pressure at 333K for 24 hours to obtain brookite-type titanium dioxide nanorods.

[0028] The prepared nano-rods are in the shape of a bouquet of multiple aggregates, the diameter of a single nano-rod is 20-50 nanometers, the length is 500-2000 nanometers, and the purity is over 99%.

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Abstract

The invention relates to a preparation method of one-dimensional pyromelane (crystalline) nanometer titanium dioxide. The preparation method has the following main steps: direct hydrolysis of titanic acid ester is firstly carried out in ammonia water containing strong electrolyte inorganic salt, and then one-step hydro-thermal treatment is carried out to prepare high purity pyromelane (crystalline) titanium dioxide nano-rods. The preparation method in the invention has concise preparation process, high purity of target product (the purity being more than or equal to 99%), stable performance and wide adjustable extent of parameters, thereby being a preparation method of high-purity pyromelane (crystalline) titanium dioxide nano-rods with commercial prospect.

Description

technical field [0001] The invention relates to a preparation method of one-dimensional nano titanium dioxide, in particular to a preparation method of one-dimensional brookite (crystal) type nano titanium dioxide. Background technique [0002] Nano titanium dioxide (TiO 2 ) is widely used in environmental fields such as air purification and sewage treatment because of its good chemical stability, light corrosion resistance, safety and non-toxicity, no secondary pollution and strong photocatalytic ability. [0003] Studies have shown that: TiO 2 Catalyst performance and TiO 2 The crystal form, grain size and morphology are related. Brookite (crystal) nano-titanium dioxide rods have a special crystal structure and unique one-dimensional morphology, resulting in more excellent photoelectrochemical properties, photocatalytic properties and mechanical properties (M.Koelsch, S .Cassaignon, J.F.Guillemoles, J.R.Jolivet, Thin Solid Films 403(2002) 312-319 and J.G. Li, T.Ishigak...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 陈锋赵斌曲文武张金龙
Owner EAST CHINA UNIV OF SCI & TECH
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