Novel Keggin-type polyoxometallate compound as well as preparation method and application thereof

An oxoate compound and polymetallic technology, applied in the directions of tin compounds, tungsten compounds, titanium compounds, etc., can solve the problems of low photocatalytic efficiency, inability to mineralize organic matter, and inability to make full use of it, and achieve a simple preparation method and easy raw materials. The effect of obtaining and improving the decolorization and degradation ability

Inactive Publication Date: 2012-10-24
DALIAN JIAOTONG UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

However, in some cases, due to the formation of stable intermediates, TiO 2 Organic matter cannot be completely mineralized, and due to TiO 2 The photocatalytic efficiency of TiO is low, mainly using ultraviolet light less than 400nm (while the ultraviolet light in solar light energy is less than 5%), and cannot make full use of the abundant energy in nature - solar energy, people began to look for other materials with TiO 2 Photocatalytic materials with different catalytic mechanisms

Method used

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  • Novel Keggin-type polyoxometallate compound as well as preparation method and application thereof
  • Novel Keggin-type polyoxometallate compound as well as preparation method and application thereof
  • Novel Keggin-type polyoxometallate compound as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] ① Dissolve 18.2g of sodium tungstate in 100ml of deionized water, adjust the pH of the system to 7~8 with glacial acetic acid to obtain solution A;

[0040] ②Accurately measure 5.55ml, 0.273mol / L TiCl 4 Solution, get solution B;

[0041] ③Add solution B to solution A, stir evenly, adjust the pH value of the system to 4.5-5.5 with glacial acetic acid, and reflux for 15-30 minutes at 70℃;

[0042] ④ Dissolve 1.075g of stannous sulfate in 10ml of deionized water, adjust the pH value of the system to 5~5.5 with 0.2g / ml sodium acetate aqueous solution to obtain solution C;

[0043] ⑤ Under nitrogen protection, add 30ml of solution C to step ③, heat to 95°C, reflux for 1.5h, add 20ml of 0.25g / ml KCl aqueous solution 10 minutes before the end of the reaction;

[0044] ⑥ After the reaction, the solution is cooled to room temperature and filtered to remove insoluble materials. Add 100-150ml of absolute ethanol to the above solution, stir slowly, and after a yellow solid precipitates, filt...

Embodiment 2

[0053] Take 20ml, 5mg / L Reactive Red 24 aqueous solution in a beaker, add 20mg K 6 TiW 11 O 39 Sn Ⅱ ·7H 2 O catalyst (concentration of catalyst in solution: 1g / L), placed in outdoor sunlight for 5 hours, the average temperature is 20℃. After 5 hours of photocatalytic degradation, the decolorization rate of Reactive Red 24 aqueous solution was 65%. Image 6 In this example, the ultraviolet-visible spectra before (a) and after (b) of photolysis. It can be seen from the figure that the absorption peak of the aqueous solution of Reactive Red 24 in the visible region is significantly reduced, indicating that the molecular azo bond has been destroyed .

Embodiment 3

[0055] For the initial pH of the solution=5, 20ml, 5mg / L acid scarlet 3R aqueous solution, add 20mgK 6 TiW 11 O 39 Sn Ⅱ ·7H 2 O catalyst (the concentration of the catalyst in the solution: 1g / L), photodegraded in outdoor sunlight for 5 hours, its decolorization rate reached 80.3%, and most of the azo groups of the acid scarlet have been destroyed.

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Abstract

The invention relates to a novel Keggin-type polyoxometallate compound, wherein the molecular formula of the compound is K6TiW11O39Sn II.7H2O, and the compound has a Keggin structure. The polyoxometallate compound which is prepared according to the invention has a simple preparation method, and raw materials are easily obtained; the polyoxometallate compound as a photocatalyst can have better decoloring and degrading capabilities for organic dye wastewater of reactive red 24 or a reactive red 24-like structure under the condition of visible light; and the novel Keggin-type polyoxometallate compound has wide application prospects in the aspect of degrading the organic dye wastewater.

Description

Technical field [0001] The invention relates to a Keggin type polyoxometalate photocatalyst, in particular to a Keggin type polyoxometalate photocatalyst with high catalytic activity in the visible light range. Background technique [0002] In recent years, with the continuous growth of population and the rapid development of industry, my country's water pollution situation has become more and more severe. With the rapid development of my country's industrial production, a large number of pollutants continue to enter the natural world, causing serious pollution to the natural environment. Most of these pollutants exist in the atmosphere and water bodies, and the pollution to water bodies is more serious. my country’s water pollution can be basically divided into five categories from the source, namely: industrial pollution, agricultural pollution, domestic pollution, shipping pollution, and aquaculture pollution. Among them, industrial pollution is the main source of water pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C01G19/00C01G23/00B01J31/16
Inventor 朱秀华王炜史福有穆军董学伟
Owner DALIAN JIAOTONG UNIVERSITY
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