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Polyoxometallate and compound, preparation method and application thereof

A technology of polyoxometalates and complexes, applied in chemical instruments and methods, water treatment of special compounds, water pollutants, etc. Problems such as low utilization of light energy

Active Publication Date: 2018-08-03
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a polyoxometalate and its composite, preparation method and application, aiming at solving the problem of the existing polyoxometalate with small specific surface area, low utilization rate of light energy, easy solubility in The problem of water not being recycled

Method used

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  • Polyoxometallate and compound, preparation method and application thereof
  • Polyoxometallate and compound, preparation method and application thereof
  • Polyoxometallate and compound, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Polyoxometalate compounds (NH 4 ) 3 PW 11 O 39 Preparation of Sn:

[0062] Step 1: Weigh ammonium phosphotungstate and stannous chloride in a mass ratio of 1:2, add them into 20 mL of distilled water respectively, and dissolve them ultrasonically to obtain stannous chloride solution and ammonium phosphotungstate dispersion;

[0063]Step 2: Pour the stannous chloride aqueous solution into the ammonium phosphotungstate dispersion liquid and ultrasonically mix evenly to obtain a mixed dispersion liquid;

[0064] Step 3: Adjust the pH of the mixed dispersion to 1.0, place the pH-adjusted mixed solution in a water bath, heat in a water bath at 60°C for 3 hours, cool, filter with suction, and dry at 40°C to obtain polyoxometalates. compound.

Embodiment 2-5

[0066] The polyoxometalate compound (NH 4 ) 3 PW 11 O 39 The preparation method of Sn is the same as that in Example 1, and the specific reaction conditions are shown in Table 1.

[0067] Table 1 embodiment 2-5 reaction conditions

[0068] Example

(NH 4 ) 3 PW 12 O 40 and SnCl 2 mass ratio

pH

2

1:3

1.5

3

1:1

2.0

4

1:2

2.5

5

1:0.5

3.0

[0069] Taking Example 4 as an example, characterization was carried out, and the characterization results were as follows:

[0070] Scanning electron microscope SEM ( Figure 1a and Figure 1b ), it can be seen that after doping with transition metal tin, the particles become smaller, the particle distribution is uniform, and the particles are fluffy. This fluffy structure is conducive to the contact between the pollutants and the catalyst and improves the photocatalytic activity of the catalyst. Figure 1c and Figure 1d for (NH 4)3 PW 12 O 40 and (NH 4 )...

Embodiment 6

[0094] Complexes of polyoxometalates (NH 4 ) 3 PW 11 O 39 Sn / TiO 2 Preparation of:

[0095] Step a, according to the mass ratio of 1:2, weigh the polyoxometalate and titanium dioxide nanoparticles prepared in Example 4, add in 30 mL of absolute ethanol, dissolve by ultrasonic, polyoxometalate dispersion and titanium dioxide dispersion ;

[0096] Step b. Add the titanium dioxide dispersion into the polyoxometalate dispersion and mix evenly with ultrasonics, mix well, adjust the pH to 1.0, transfer to a water bath at 60°C, heat in a water bath for 3 hours, cool, filter and wash with suction, Dry at 40°C and grind to obtain powder (NH 4 ) 3 PW 11 O 39 Sn / TiO 2 catalyst of light.

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Abstract

The invention relates to the field of inorganic non-metallic material preparation, and particularly discloses polyoxometallate and a compound, a preparation method and application thereof. The molecular formula of polyoxometallate is (NH4)3PW11O39Sn, polyoxometallate has a Keggin structure, and the grain size is 10nm to 30nm. A catalyst, which is applied in the degradation of organic pollutant acid scarlet 3R, not only has excellent catalytic activity under visible light, but also has the advantages of simple separation and recyclability, and is an environment-friendly catalyst.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic non-metallic materials, in particular to a polyoxometalate and a composite thereof, a preparation method and application thereof. Background technique [0002] Dyes are widely used in textile, leather, food, plastic, cosmetics and electronics industries. According to statistics, the global annual output of organic synthetic dyes exceeds 700,000 tons, and about 20% of them are lost into industrial wastewater during production and use. The environmental problems caused by these low-concentration, high-toxicity, and refractory organic dyes have seriously affected human health. Therefore, the decolorization and removal of organic dye wastewater is of great significance. Photocatalytic technology is powered by solar energy and can be carried out under mild conditions at room temperature and pressure. It is simple and fast, and has no secondary pollution. In recent years, it has attra...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/38
CPCC02F1/30B01J27/24C02F2305/10C02F2101/38C02F2101/308B01J35/39
Inventor 岳琳孙文会廉静罗晓张迎段二红
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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