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Preparation method for TiO2/WO3 composite powder

A composite powder, evenly mixed technology, used in chemical instruments and methods, chemical/physical processes, adsorbed water/sewage treatment, etc., can solve the problems of harsh reaction conditions, long reaction cycle, complex preparation process, etc. Low cost, short cycle time, high photodegradability effect

Active Publication Date: 2015-07-01
广西自贸区见炬科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These preparation methods have their unique advantages, but most of them have disadvantages such as complex preparation process, long reaction cycle, and harsh reaction conditions [Xie Yanzhao, Lin Ruijun, Zhao Lin, etc. Composite TiO 2 Research progress on photocatalyst preparation and photocatalytic properties[J]. Jiangxi Chemical Industry, 2014, (2).]

Method used

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  • Preparation method for TiO2/WO3 composite powder
  • Preparation method for TiO2/WO3 composite powder
  • Preparation method for TiO2/WO3 composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Mix titanium sulfate, urea, ethanol, and deionized water according to the mass ratio of titanium sulfate: urea: ethanol: deionized water = 2:0.8:8:60, and stir at 40°C for 2 hours, then add acetyl Acetone, solution A was obtained after stirring at room temperature for 0.4 h. Wherein, the addition of acetylacetone is 1.5% of the solution A mass.

[0029] 2) Add concentrated nitric acid with a mass fraction of 65% to solution A at 40°C dropwise, and fully react after dropping for 2 hours to obtain solution B. Wherein, the quality of concentrated nitric acid is 0.2% of solution B quality.

[0030] 3) At room temperature, the K 2 WO 3 2H 2 O was dissolved in deionized water to prepare K with a concentration of 0.2 mol / L 2 WO 4 aqueous solution, after magnetic stirring for 20 minutes, the pH value was adjusted to 3.0 with 3 mol / L hydrochloric acid to obtain solution C.

[0031] 4) According to the molar ratio of Ti and W elements n Ti :n W =x: (100-x), wherein x=...

Embodiment 2

[0039] 1) Mix titanium sulfate, urea, ethanol, and deionized water according to the mass ratio of titanium sulfate: urea: ethanol: deionized water = 2:0.8:8:60, stir at 40°C for 2 hours, and then add acetylacetone , solution A was obtained after stirring at room temperature for 0.4 h. Wherein, the addition of acetylacetone is 1.5% of the solution A mass.

[0040] 2) Add concentrated nitric acid with a mass fraction of 65% to solution A at 40°C dropwise, and fully react after dropping for 2 hours to obtain solution B. Wherein, the quality of concentrated nitric acid is 0.3% of solution B quality.

[0041] 3) At room temperature, the K 2 WO 4 2H 2 O was dissolved in deionized water to prepare K with a concentration of 0.2 mol / L 2 WO 4 aqueous solution, after magnetic stirring for 20 minutes, the pH value was adjusted to 3.0 with 3 mol / L hydrochloric acid to obtain solution C.

[0042] 4) According to the element molar ratio n Ti :n W =x: (100-x), where x=70, solution B ...

Embodiment 3

[0044] 1) Mix titanium sulfate, urea, ethanol, and deionized water according to the mass ratio of titanium sulfate: urea: ethanol: deionized water = 2:0.8:8:60, stir at 40°C for 2 hours, and then add acetylacetone , solution A was obtained after stirring at room temperature for 0.4 h. Wherein, the addition of acetylacetone is 1.5% of the solution A mass.

[0045] 2) Add concentrated nitric acid with a mass fraction of 65% to solution A dropwise at 40° C., stir for 2 hours and fully react to obtain solution B. Wherein, the quality of concentrated nitric acid is 0.3% of solution B quality.

[0046] 3) At room temperature, the K 2 WO 4 2H 2 O was dissolved in deionized water to prepare K with a concentration of 0.2 mol / L 2 WO 4 aqueous solution, after magnetic stirring for 20 minutes, the pH value was adjusted to 3.0 with 3 mol / L hydrochloric acid to obtain solution C.

[0047] 4) According to the molar ratio of Ti and W elements n Ti :n W =x: (100-x), wherein x=50, solu...

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Abstract

The invention discloses a preparation method for TiO2 / WO3 composite powder. The preparation method comprises the following steps: uniformly mixing titanium sulfate, urea, alcohol and deionized water, adding acetylacetone, and uniformly stirring at the room temperature to obtain a solution A; dropwise adding concentrated nitric acid into the solution A to obtain a solution B; preparing a 0.1-0.3mol / L K2WO4 aqueous solution, and regulating the pH value to 1-3.5 to obtain a solution C; mixing the solution B with the solution C. performing hydrothermal reaction to obtain the TiO2 / WO3 composite powder. According to the preparation method disclosed by the invention, the titanium sulfate, K2WO4.2H2O and the like with low price are taken as raw materials, so that the preparation cost is low; a solution containing Ti and W is prepared and a product with the advantages of low reaction temperature and short period can be prepared by adopting a one-step hydrothermal method. By using the hydrothermal method is adopted, the TiO2 / WO3 composite powder with controllable morphology, high purity, small particles and a uniform particle size can be prepared.

Description

technical field [0001] The invention belongs to the technical field of composite powder preparation, and in particular relates to a shape-controllable TiO 2 / WO 3 Preparation method of composite powder. Background technique [0002] TiO 2 It has the advantages of stable chemical properties, corrosion resistance, acid and alkali resistance, low price, and abundant reserves. But TiO 2 The band gap is large, and it can only absorb ultraviolet light <387nm, and ultraviolet light only accounts for about 4% of the total sunlight, making the semiconductor's utilization rate of sunlight not high. In addition, TiO 2 The generated electrons and holes are very easy to recombine, making the photocatalytic activity not high. For these shortcomings it is necessary to Ti0 2 Modification and modification are carried out, and the composite product after modification or modification can effectively improve the utilization rate of sunlight. [Xie Yanzhao, Lin Ruijun, Zhao Lin, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J20/06B01J20/30C02F1/30C02F1/28
Inventor 黄剑锋王彩薇曹丽云孔新刚张博烨刘倩倩宋倩茜刘雨洋罗兰李学林姚思源
Owner 广西自贸区见炬科技有限公司
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