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Preparation method and application of ultra-micro silver-loading titanium dioxide photocatalyst

A technology of silver-loaded titanium dioxide and photocatalyst, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of long preparation time, low preparation efficiency, and silver loading. The problem of high content, to achieve the effect of good dispersibility, reduced compound rate, and low silver content

Pending Publication Date: 2018-07-13
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the preparation method of the silver-loaded titanium dioxide nanocomposite photocatalyst disclosed in this patent document is relatively flexible, it also has the defects of high silver-loaded content, long preparation time, and low preparation efficiency.

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  • Preparation method and application of ultra-micro silver-loading titanium dioxide photocatalyst

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preparation example Construction

[0032] A preparation method of an ultra-trace amount of silver-loaded titanium dioxide photocatalyst, comprising the following steps:

[0033] A, mixing step, in the ethanol solution that is dissolved with titanium dioxide P25, add silver nitrate alcohol solution, the solution after mixing is placed in ultrasonic breaker and disperses;

[0034] B, photoreaction step, the solution after dispersion is poured in the quartz reactor, irradiates with 300W mercury lamp and feeds nitrogen to prevent the nano-state silver that reduction generates from being oxidized;

[0035] c. Drying step: Centrifuge the solution after the photoreaction, remove the supernatant, put the precipitate into a vacuum freeze dryer for freeze-drying, take it out after 36 hours of freeze-drying and grind it, and then obtain an ultra-trace amount of silver-loaded titanium dioxide photocatalyst .

[0036] In said step a, the ethanol solution having titanium dioxide P25 dissolved is obtained by dissolving titan...

Embodiment 1

[0058] A preparation method of an ultra-trace amount of silver-loaded titanium dioxide photocatalyst, comprising the following steps:

[0059] S1, mixing step

[0060] Dissolving p25: Add 0.8g of titanium dioxide P25 into a beaker, add 74mL of absolute ethanol, stir mechanically until completely dissolved;

[0061] Preparation of silver nitrate alcohol solution: Weigh 0.0126g of silver nitrate, add 100mL of absolute ethanol to dissolve, take 6ml of the above solution and add it dropwise to the P25 solution. The time is 30 minutes.

[0062] S2, photoreaction step

[0063] Add the solution obtained in the mixing step into a photochemical reaction quartz reactor, add a magnetic plastic rotor, and adjust the speed to 400r / min to make the solution more uniform. Adjust the power of the mercury lamp to 300W, and the irradiation time is 30min.

[0064] S3, drying step

[0065] The solution obtained in the photoreaction step was poured into a centrifuge tube, and the centrifuge sp...

Embodiment 2

[0068] A preparation method of an ultra-trace amount of silver-loaded titanium dioxide photocatalyst, comprising the following steps:

[0069] S1, mixing step

[0070] Dissolving p25: Add 0.8g of titanium dioxide P25 into a beaker, add 77mL of absolute ethanol, stir until completely dissolved;

[0071] Preparation of silver nitrate alcohol solution: Weigh 0.0126g of silver nitrate, add 100mL of absolute ethanol to dissolve, take 3ml of the above solution and add it dropwise to the P25 solution. for 30min.

[0072] S2, photoreaction step

[0073] Add the solution obtained in the mixing step into a photochemical reaction quartz reactor, add a magnetic plastic rotor, and adjust the speed to 400r / min to make the solution more uniform. Adjust the power of the mercury lamp to 300W and irradiate for 30min.

[0074] S3, drying step

[0075] The solution obtained in the photoreaction step was poured into a centrifuge tube, and the centrifuge speed was set to 7000 revolutions per m...

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Abstract

The invention discloses a preparation method of an ultra-micro silver-loading titanium dioxide photocatalyst, which belongs to the field of the preparation of inorganic metal oxide nano composite materials. The preparation method is characterized by comprising the following steps: a, mixing: adding a silver nitrate alcoholic solution in an ethanol solution with dissolved titanium dioxide P25, anddispersing the mixed solution in an ultrasonic crushing instrument; b, photoreaction: pouring the dispersed solution into a quartz reactor, illuminating by using a 300W mercury lamp, introducing nitrogen to prevent nano silver generated in a reduction manner from being oxidized; and c, drying: centrifuging the solution subjected to photoreaction, removing supernatant, freeze drying precipitates ina vacuum freeze drying machine, after freeze drying for 36 hours, taking out the precipitates, and grinding, thus obtaining the ultra-micro silver-loading titanium dioxide photocatalyst. The ultra-micro silver-loading titanium dioxide photocatalyst disclosed by the invention has the advantages of very low silver content, good dispersity, large specific surface area, short entire preparation time,and capability of greatly increasing the preparation efficiency.

Description

technical field [0001] The invention relates to the field of preparation of inorganic metal oxide nanocomposite materials, in particular to a preparation method and application of an ultra-trace silver-loaded titanium dioxide photocatalyst. Background technique [0002] Currently, heavy metal pollution in the water environment poses a serious threat to public health and ecosystems due to the increasing industrialization process. Cr(VI) has been generally recognized as a non-degradable toxic metal ion in the aquatic environment. Traditional degradation methods, such as reduction, precipitation, ferrite method, etc. still have the inevitable defects of high cost or secondary pollution. Therefore, it is very necessary to explore a cost-effective Cr(VI) reduction technology. [0003] Titanium dioxide P25 is currently the most valued photocatalyst with broad application prospects due to its stable chemical properties, non-toxic and harmless, and non-selective degradation of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50C02F1/30C02F101/22
CPCC02F1/30B01J23/50C02F2101/22B01J35/39
Inventor 蒲生彦陈虹宇候雅琪薛圣炀杨曾
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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