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
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Examples
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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Description
Claims
Application Information
- IPC
- C01G41/00; C01G19/00; C01G23/00; B01J31/16
- Inventors
- 朱秀华; 王炜