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Novel polyoxometallate compound, preparation method thereof and application thereof

A technology of oxo-salt compounds and multi-metals, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low photocatalytic efficiency, inability to fully utilize, and Mineralization of organic matter and other issues, to achieve the effect of simple preparation method, good decolorization and degradation ability, and easy access to raw materials

Inactive Publication Date: 2012-09-12
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • 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 relatively low, and it mainly uses ultraviolet light less than 400nm (while the ultraviolet light in solar energy is less than 5%). It 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 polyoxometallate compound, preparation method thereof and application thereof
  • Novel polyoxometallate compound, preparation method thereof and application thereof
  • Novel polyoxometallate compound, preparation method thereof and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] ①Dissolve 18.2g of sodium tungstate in 100ml of deionized water, and adjust the pH value of the system to 6-7 with glacial acetic acid to obtain solution A;

[0038] ② 1.61g, ZrOCl 2 Dissolve in 10ml deionized water to obtain solution B;

[0039] 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 then reflux at 70°C for 15-30 minutes;

[0040] ④ Dissolve 1.075g of stannous sulfate in 10ml of deionized water, and adjust the pH value of the system to 5-5.5 with 0.2g / ml sodium acetate aqueous solution to obtain solution C;

[0041] ⑤Under nitrogen protection conditions, add 30ml of solution C to step ③, raise the temperature to 95°C, reflux for 1.5h, add 20ml, 0.25g / ml KCl aqueous solution 10min before the end of the reaction;

[0042] ⑥ Cool the solution to room temperature after the reaction, remove insoluble matter by filtration, add 100-150ml of absolute ethanol to the above solution, stir slowly, af...

Embodiment 2

[0051] Take 20ml, 5mg / L Acid Scarlet 3R aqueous solution in a beaker, add 20mgK 6 wxya 11 o 39 sn II 12H 2 O catalyst (the concentration of the catalyst in the solution: 1g / L), placed in the outdoor sunlight for 5 hours, with an average temperature of 20°C. After photocatalytic degradation for 5 hours, the decolorization rate of Acid Scarlet 3R aqueous solution was 65%. Figure 6 It is the ultraviolet-visible spectrogram before (a) and after (b) of the photolysis of this embodiment. It can be seen from the figure that the absorption peak of Acid Scarlet 3R aqueous solution in the visible region is significantly reduced, indicating that its molecular azo bond has been destroyed. , and the solution after photolysis has a large absorption in the ultraviolet region, indicating that a new intermediate product is generated.

Embodiment 3

[0053] For solution initial pH=4, 60ml, 15mg / L methyl red solution, add 15mgK 6 wxya 11 o 39 5n II 12H 2 O catalyst (the concentration of the catalyst in the solution: 0.25g / L), placed in the outdoor sunlight for 1h, the decolorization rate reached 96.9%, most of the azo group of methyl red has been destroyed.

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Abstract

The invention relates to a novel polyoxometallate compound, wherein the molecular formula of the compound is K6ZrW11O39Sn<II>.12H2O and has a Keggin structure. The polyoxometallate compound prepared in the invention has the advantages of simple preparation method and easily available raw materials; the polyoxometallate compound can be used as a photocatalyst, and can well decolor and degrade organic dye wastewater having an acid brilliant scarlet or acid brilliant scarlet-like structure under visible light conditions; and the polyoxometallate compound has wide application prospects in the organic dye wastewater degradation.

Description

technical field [0001] The invention relates to a polyoxometalate photocatalyst, in particular to a polyoxometalate photocatalyst with high catalytic activity in the visible light range. Background technique [0002] With the development of my country's industrialization, the printing and dyeing industry is also developing rapidly, and the discharge of dye wastewater is also increasing day by day. A large amount of wastewater flows into the environment. With the rapid development of the dye industry and the advancement of finishing technology, new auxiliaries and dye finishing agents are widely used in the printing and dyeing industry, which further increases the difficulty of printing and dyeing wastewater treatment. The direct discharge of dye wastewater has seriously damaged water bodies, soils, and ecosystems, posing a great threat to the ecological environment and human health. Printing and dyeing wastewater has become one of the main harmful and difficult-to-treat indu...

Claims

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Application Information

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IPC IPC(8): B01J23/30C02F1/30C02F103/30
CPCY02W10/37
Inventor 朱秀华王炜刘佳欢穆军董学伟
Owner DALIAN JIAOTONG UNIVERSITY
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