Synthesis of titania with high specific surface area

A technology with high specific surface area and synthesis method, which is applied in the field of titanium oxide synthesis with high specific surface area, can solve the problems of no specific surface area data and photocatalytic activity, difficult removal of template agent, poor effect of organic matter, etc., and achieve stable organic matter activity and low cost , The effect of high activity of organic matter

Inactive Publication Date: 2004-09-08
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method of preparing this material is to use organic amines or copolymers as templates, and use hydrothermal synthesis or sol-gel methods. [2] , the mesoporous TiO prepared by this method 2 The powder has a good pore structure, but there are problems such as difficult removal of the template agent, complicated process, and high cost.
[0006] Starting from potassium tetratitanate, monoclinic TiO can be obtained by heat-treating its hydrated ion-exchange product 2 [3] , however due to this TiO 2 The specific surface area is small, and the effect of photocatalytic degradation of organic matter is poor [4]
Starting from potassium dititanate, TiO can be obtained 2 polycrystalline fiber [5] , however there is no report on its specific surface area data and photocatalytic activity

Method used

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  • Synthesis of titania with high specific surface area
  • Synthesis of titania with high specific surface area
  • Synthesis of titania with high specific surface area

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ① Anatase TiO 2 , Industrial Grade K 2 CO 3 (purity 98wt%), H 2 O is uniformly mixed, where TiO 2 / K 2 O=2.5 (mol ratio), water content 20wt%; ②Apply the mixed reaction materials evenly on the alumina backing plate, the reaction temperature is 1000°C, the reaction time is 2 hours, and the sintered products are potassium dititanate and tetratitanic acid Potassium mixed crystals; ③After the sintered product is dispersed in water, it is placed in an aqueous solution of 50°C and 5 times of pH=8 to react for 8 hours. The amount is less than 5wt% of the product weight; ④Washing, filtering, and drying at 20-50°C for 12 hours to obtain a hydrated product with a specific surface area of ​​268m 2 / g; ⑤ Crystallized in air at 500°C for 2 hours, the obtained TiO 2 The crystal form is anatase and monoclinic TiO 2 Mixed crystals, the morphology is whisker-like, the specific surface area is 105m 2 / g.

[0018] The photocatalytic experiment uses a cylindrical photochemical rea...

Embodiment 2

[0020] ①Amorphous titanium dioxide, potassium nitrate, H 2 O is uniformly mixed, where TiO 2 / K 2 O=3 (mol ratio); ②Apply the mixed reaction materials evenly on the alumina backing plate, the reaction temperature is 810°C, the reaction time is 1 hour, and the sintered product is potassium dititanate; ③After the sintered product is dispersed in water, Placed at 60° C., 20 times the potassium nitrate solution containing K+ ion concentration of 2mol / L to react for 10 hours, then stirred in an aqueous nitric acid solution with a pH of 1 for 8 hours, until the potassium content in the solid phase was less than 5wt% of the product weight; ④ Wash with water, filter, and dry at 20-50°C for 12 hours to obtain a hydrated product with a specific surface area of ​​200m 2 / g; ⑤ hydrothermal crystallization at 200°C for 1 hour to obtain anatase TiO 2 and a small amount of rutile TiO 2 , the shape of the product is granular, the equivalent diameter is 1-5μm, and the specific surface area...

Embodiment 3

[0022] Anatase TiO 2 , Industrial Grade K 2 CO 3 (purity 98wt%), H 2 O is uniformly mixed, where TiO 2 / K 2 O=3 (mol ratio), water content 30wt%; ②Apply the mixed reaction materials evenly on the alumina backing plate, the reaction temperature is 1000°C, the reaction time is 3 hours, and the sintered products are potassium dititanate and tetratitanic acid Potassium mixed crystal; ③ After the sintered product is dispersed in water, it is placed in an aqueous solution of 80°C and 40 times of pH = 10 to react for 12 hours. The amount is less than 5wt% of the product weight; ④Washing, filtering, and drying at 20-50°C for 12 hours to obtain a hydrated product with a specific surface area of ​​150m 2 / g; ⑤ In a round-bottomed flask with a condensing reflux device, dehydrate at a constant temperature of 150-250°C in glycerin (normal pressure) for 24 hours, filter, wash with ethanol, and dry at 80°C. The crystal form of the obtained product is eight Titanic acid type, the shape ...

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Abstract

The synthesis of titania with high specific surface area includes sintering titanium compound and potassium compound material to obtain potassium titanate containing potassium dititanate crystal; dispersing the sintering product in water, reactionalkali solution of 1-50 times in pH not less than 8 at 20-100 deg.c for over 4 hr; hydration treatment in acid solution to obtain hydrated product with potassium content less than 5 wt% and specific surface area over 100 sq m / g; heat treatment and crystallization to obtain the titania mixture with excellent photocatalytic activity and specific surface area over 50 sq m / g. The said production process uses no template and is simple and low in cost, and the product is crystal whisker, fiber or grain of diameter or equivalent diameter 0.1-10 micron and may be used as catalyst or catalyst carrier used, especially, in photocatalytic field. It is more easily in separation and recovery than nano level titania.

Description

Technical field: [0001] The invention belongs to the technical field of catalyst preparation, in particular to a method for synthesizing titanium oxide with a high specific surface area. technical background: [0002] Titanium dioxide (TiO 2 ) is easily stimulated by light to generate photogenerated electrons and holes, and using it as a photocatalyst to degrade organic pollutants in water is an emerging research field developed in the past 20 years [1] . For example, it can degrade toxic organic pollutants that are difficult to degrade, such as organic halogenated hydrocarbons, polychlorinated biphenyls, organic phosphorus compounds, and polycyclic aromatic hydrocarbons, which are strongly carcinogenic and mutagenic. [0003] A large number of studies have shown that the size of the specific surface area and the type of crystal form determine the level of photocatalytic activity of titanium dioxide. Ensure TiO 2 At the same time, it has the crystal form of anatase and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/00
Inventor 陆小华何明杨祝红冯新郑仲暴宁钟
Owner NANJING UNIV OF TECH
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