Photoactivation preparation method for nano-AgCl/Ag visible-light catalyst

A catalyst, visible light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of difficult to achieve multiple recycling of catalysts, low effective utilization of solar energy, and easy damage to operators. problem, to achieve good application prospects, simple method, short time effect

Inactive Publication Date: 2012-05-09

TONGHUA NORMAL UNIV

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Problems solved by technology

[0007] But TiO 2 Semiconductors such as ZnO or ZnO are basically wide bandgap semiconductors. The light absorption wavelength is mainly in the ultraviolet region, and the range is narrow. Only ultraviolet light accounting for 4% of the solar spectrum range can be used, and the effective utilization rate of solar energy is low. To obtain better If the catalytic effect is high, a special high-pressure mercury lamp must be used to provide high-...

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Abstract

The invention belongs to the technical field of sewage treatment, specifically relates to a preparation method for a high activity catalyst with visible-light response ability, and an application of the catalyst in degradation of organic dyes. According to the preparation method, AgCl nanoparticles are firstly prepared in an ethylene glycol solvent with an assistant effect of polyvinylpyrrolidone; then the partial AgCl is subjected to photoreduction to form Ag nanoparticles by illumination so as to obtain the nano-AgCl/Ag composite photocatalyst. According to the present invention, the preparation method has characteristics of simpleness, fastness, mild conditions and high yield; the prepared product has high catalytic efficiency and strong light corrosion resistance, and still maintains the high catalytic activity after repeatedly using the product six times; the catalyst of the present invention does not require the special light source, and can performs the catalytic operation under sunlight or ordinary sunlight lamp simulating the sunlight, and the degraded products are CO2 and H2O, such that the catalytic operation has characteristics of simpleness, no toxic and side-effect, and short time, wherein the 100% degradation of the organic dye can be completed in 15-30 minutes.

Application Domain

Water/sewage treatment by irradiationCatalyst activation/preparation +2

Technology Topic

SolventCorrosion +13

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Examples

Experimental program(4)

Example Embodiment

[0034] Example 1:

[0035] (1) Measure about 60 mL of ethylene glycol, add 0.41 g of polyvinylpyrrolidone, heat the solution to about 25°C in a constant temperature water bath and dissolve the polyvinylpyrrolidone completely under stirring;

[0036] (2) Add 0.348g of sodium chloride to the above solution and dissolve the sodium chloride completely under stirring;

[0037] (3) Dissolve 0.428 g of silver nitrate in about 5 mL of ethylene glycol solution;

[0038] (4) Add the ethylene glycol solution obtained in step (3) dropwise to the solution obtained in step (2), and allow the reaction to continue at 25°C for 30 minutes to obtain spherical AgCl nanoparticles;

[0039] (5) Place the prepared AgCl nanoparticles together with the mother liquor under a 25W Philips cold light source fluorescent lamp and irradiate it for about 30 minutes while stirring. It can be seen that the milky white suspension gradually turns into a blue-violet suspension;

[0040] (6) Centrifuge the blue-violet suspension at 10,000 rpm, discard the upper layer, and wash once with water to obtain a blue-violet AgCl/Ag nanoparticle composite (catalyst 1);

[0041] (7) Respectively formulated concentration is 20mg.L -1 Solution of organic dyes such as methyl blue, methyl orange, rhodamine B;

[0042] (8) Disperse the AgCl/Ag nanoparticle composite into 50 mL of organic dye solution. The container used is an ordinary glass beaker and placed under simulated sunlight generated by a 25W Philips cold light source fluorescent lamp. The container is 10 cm away from the light source.

[0043] (9) At 2min, 5min, 10min, 15min and 30min after the start of catalysis, draw about 5mL of the catalytic solution for centrifugal separation, and take the supernatant to observe the catalytic effect with naked eyes and UV-visible spectroscopy.

Example Embodiment

[0044] Example 2:

[0045] (1) Measure about 60 mL of ethylene glycol, add 0.28 g of polyvinylpyrrolidone, heat the solution to about 50°C in a constant temperature water bath and dissolve the polyvinylpyrrolidone completely under stirring;

[0046] (2) Add 0.226g of sodium chloride to the above solution and dissolve the sodium chloride completely under stirring;

[0047] (3) Dissolve 0.286 g of silver nitrate in about 5 mL of ethylene glycol solution;

[0048] (4) Add the ethylene glycol solution obtained in step (3) dropwise to the solution obtained in step (2), and allow the reaction to continue at 50° C. for 20 minutes to obtain spherical AgCl nanoparticles;

[0049] (5) Place the prepared AgCl nanoparticles together with the mother liquor under a 25W Philips cold light source fluorescent lamp and irradiate it for about 20 minutes while stirring. It can be seen that the milky white suspension gradually turns into a blue-purple suspension;

[0050] (6) Centrifuge the blue-violet suspension at 10,000 rpm, discard the upper layer, and wash once with water to obtain a blue-violet AgCl/Ag nanoparticle composite (catalyst 2);

[0051] Steps (7) to (9) are the same as steps (7) to (9) of Example 1.

Example Embodiment

[0052] Example 3:

[0053] (1) Measure about 60 mL of ethylene glycol, add 0.14 g of polyvinylpyrrolidone, heat the solution to about 80°C in a constant temperature water bath and dissolve the polyvinylpyrrolidone completely under stirring;

[0054] (2) Add 0.113g of sodium chloride to the above solution and dissolve the sodium chloride completely under stirring;

[0055] (3) Dissolve 0.143 g of silver nitrate in about 5 mL of ethylene glycol solution;

[0056] (4) Add dropwise the ethylene glycol solution obtained in step (3) to the solution obtained in step (2), and allow the reaction to continue at 80° C. for 10 minutes to obtain spherical AgCl nanoparticles;

[0057] (5) Centrifugally separate the prepared AgCl nanoparticles from the mother liquor at 10,000 rpm and then disperse them into 50 mL of deionized water;

[0058] (6) The solution obtained in step (5) is irradiated under a 25W Philips cold light source fluorescent lamp while stirring for about 10 minutes. It can be seen that the milky white suspension gradually turns into a blue-purple suspension, which is centrifuged to obtain a blue-purple AgCl/ Ag nanoparticle composite (catalyst 3);

[0059] Steps (7) to (9) are the same as steps (7) to (9) of Example 1.

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Classification and recommendation of technical efficacy words

High catalytic activity

Photoactivation preparation method for nano-AgCl/Ag visible-light catalyst

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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