Compound visible photocatalyst, and preparation method and application thereof

A catalyst and visible light technology, which is applied in the field of composite visible light catalyst and its preparation, can solve the problems of low photocatalytic performance, low quantum efficiency, and research on bactericidal performance of CTF, and achieve good application prospects and high-efficiency bactericidal performance.

Active Publication Date: 2015-12-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used TiO2-based photocatalysts have the disadvantages of low quantum efficiency and low solar energy utilization.
In response to these problems, the researchers studied TiO 2 A large number of modification studies have been carried out, including various metal and non-metal element doping, noble metal surface deposition, semiconductor recombination, dye sensitization, etc., and some progress has been made, but the low quantum efficiency and solar energy have not been fundamentally solved. These two major problems of low utilization rate have prompted researchers to further turn their attention to non-TiO 2 A series of compounds, trying to develop new and efficient photocatalysts and broaden the response range of photocatalysts
[0004] In our previous work, we found that under visible light irradiation, covalent triazine organic polymer (CTF) can photolyze water to produce hydrogen, but did not study the bactericidal performance
Moreover, due to the low quantum efficiency of CTF catalysts, photogenerated electrons and holes are easy to recombine, resulting in low photocatalytic performance of CTF.

Method used

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  • Compound visible photocatalyst, and preparation method and application thereof
  • Compound visible photocatalyst, and preparation method and application thereof
  • Compound visible photocatalyst, and preparation method and application thereof

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preparation example Construction

[0023] The specific preparation method of the composite visible light catalyst of the present invention comprises the following steps:

[0024] (1) Preparation of covalent triazine polymer

[0025] Under the condition of stirring at 0°C, add 40mL trifluoromethanesulfonic acid into 5.12g terephthalonitrile, change the oil bath and raise the temperature to 30°C, after standing for 3 days, the obtained solid is rinsed with 160-200mL of dichloromethane , and then washed with ammonia water; then add 200-250mL ammonia water and stir overnight, wash with water and centrifuge, and finally wash with methanol and centrifuge once to obtain a solid precipitate; reflux the solid with methanol at 90°C for 36h, then dichloromethane in Reflux at 70°C for 36 hours, and vacuum dry at 80°C for 12 hours to obtain a covalent triazine polymer;

[0026] (2) Preparation of AgBr / CTF complex

[0027] Add 0.169-1.518g of hexadecyltrimethylammonium bromide into 50mL of distilled water, heat and dissolv...

Embodiment 1

[0032] The preparation of embodiment 1Ag / AgBr / CTF composite

[0033] Add 0.169g of cetyltrimethylammonium bromide into a beaker with 50mL of distilled water, heat and dissolve in a water bath at 70°C, add 0.5g of the prepared CTF, stir and dissolve for 60min, then add 0.079g of AgNO 3 , continue to stir for 4 hours, then centrifuge, wash the precipitate with distilled water and absolute ethanol, and dry it at 80°C to obtain an AgBr / CTF composite with a loading capacity of AgBr of 10%; In a quartz tube, stir and pass hydrogen for 30 minutes, irradiate for 2 hours under a 400nm xenon lamp, centrifuge, dry, and grind to obtain the Ag / AgBr / CTF composite with a loading of Ag element of 10%.

Embodiment 2

[0034] The preparation of embodiment 2Ag / AgBr / CTF composite

[0035] Add 0.506g of cetyltrimethylammonium bromide into a beaker filled with 50mL of distilled water, heat and dissolve in a water bath at 70°C, add 0.5g of the prepared CTF, stir and dissolve for 60min, then add 0.236g of AgNO 3 , continue to stir for 4 hours, then centrifuge, wash the precipitate with distilled water and absolute ethanol, and dry it at 80°C to obtain an AgBr / CTF composite with a loading capacity of AgBr of 30%; In a quartz tube, after stirring and passing hydrogen for 30 minutes, irradiate for 2 hours under a 400nm xenon lamp, centrifuge, dry, and grind to obtain an Ag / AgBr / CTF composite with an Ag element loading of 30%.

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Abstract

The invention discloses a compound visible photocatalyst, and a preparation method and an application thereof, and belongs to the technical fields of material preparation and photocatalysis. The compound visible photocatalyst is a Ag/AgBr/CTF compound, and is prepared through the following steps: preparing CTF through adopting a liquid phase synthesis technology, loading AgBr on the CTF, and reducing parts of AgBr by a photoreduction technology to load elemental Ag on the above obtained AgBr/CTF compound. The compound visible photocatalyst prepared in the invention has the advantages of high active component utilization rate and efficient photocatalysis sterilization effect, and can be used as a photocatalysis bactericide.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a composite visible light catalyst with high-efficiency bactericidal activity and its preparation method and application. Background technique [0002] In recent years, with the improvement of people's living standards, people pay more and more attention to the hygiene of working and living environments, and various antibacterial functional materials have emerged as the times require. Among them, photocatalysts have attracted extensive attention of researchers because of their mild reaction conditions, no secondary pollution, and the ability to utilize sunlight. Compared with traditional fungicides, photocatalysts can effectively deal with the toxic and pyrogenic substances released by bacteria after death. [0003] Photocatalytic technology is an advanced oxidation technology, the principle of which is that photocatalysts such as tita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30A01N59/16A01P3/00A01P1/00
Inventor 毕进红李晓芬何运慧李留义方伟梁诗景刘明华
Owner FUZHOU UNIV
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