Visible-light-induced photocatalyst and preparation method and application thereof

A photocatalyst, zeolite material technology, applied in molecular sieve catalysts, chemical instruments and methods, botanical equipment and methods, etc., can solve problems such as hindering the wide application of photocatalysts, difficulty in large-scale production and application, and complex photocatalyst synthesis, etc. Achieve excellent photocatalytic performance, improve photocatalytic activity, and low cost.

Inactive Publication Date: 2020-11-10
鲁雪
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most photocatalysts in the prior art can only be excited by ultraviolet light
Ultraviolet light accounts for only 4% of the solar spectrum, which seriously hinders the widespread application of photocatalysts
[0003] In addition, the preparation of photocatalysts needs to consider the cost and scale, but the synthesis of photocatalysts in the prior art is complicated and costly, and it is currently difficult to produce and apply them on a large scale

Method used

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  • Visible-light-induced photocatalyst and preparation method and application thereof
  • Visible-light-induced photocatalyst and preparation method and application thereof
  • Visible-light-induced photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 39.6 g of trimethyladamantane ammonium hydroxide aqueous solution (25% by mass fraction) and 19.5 g of tetraethoxysilane were dissolved in 4.05 g of water and stirred evenly. Then add 1.05g aluminum triethoxide to this solution and stir well. Subsequently, the above solution was transferred to a high-pressure reactor, and heated in an oven for 6 days at a heating temperature of 140° C. to obtain a white product. The resulting white product was centrifuged, washed, dried and ground. Then the product is placed in a tube furnace for calcination for 8h, the calcination atmosphere is an oxygen-helium gas atmosphere, wherein the volume fraction of oxygen is controlled at 0%, 2.5%, 5%, 10%, 15%, and the calcination temperature is 550 ℃. When the oxygen volume fraction is 2.5%-10%, it can ensure that all (or most) of the organic template is converted into a single form of carbon, and the carbon content is about 2%-10%. This carbon will enter the zeolite framework in the form...

Embodiment 2

[0086] Dissolve 89.6g of tetraethylammonium hydroxide, 0.53g of sodium chloride and 1.44g of potassium chloride in 59.4g of water, and stir evenly at room temperature to form solution A. Mix 29.54g of silicon dioxide (purity 99%) with solution A, stir well, and use it as solution B. Solution C was formed by dissolving 0.33 g of sodium hydroxide and 1.79 g of sodium chlorate in 20 g of water. Solution B and solution C were mixed and stirred evenly, then transferred to a high-pressure reactor for heating at a heating temperature of 135° C. for 20 hours. The resulting product was collected, dried and ground, and then the product was calcined in a tube furnace. The calcining atmosphere was an oxygen-helium gas atmosphere, wherein the volume fraction of oxygen was 0.1%, 1.5% and 10%, respectively, and the calcining temperature was 550°C, the calcination time is 8h. Since the content of the organic template in the BEA zeolite is lower than that of the CHA zeolite, the volume fract...

Embodiment 3

[0093] 0.05g of the carbon-modified CHA type (carbon content 7%) prepared by calcining under 5% oxygen in Example 1 above or the carbon-modified BEA type prepared by calcining under 1.5% oxygen in Example 2 The zeolite photocatalyst (7% carbon content) was dispersed in 50 mL of rhodamine B dye solution, and the concentration of rhodamine B was 50 ppm. At room temperature, irradiate with a 300-watt xenon lamp equipped with a UV intercept filter as a visible light source (≥420nm), take 2 mL of the suspension every 20 minutes for centrifugation, and then take 1 mL of the supernatant, and use UV-visible light spectrophotometry The concentration of rhodamine B was detected by the instrument.

[0094] like Figure 17 It was shown that under visible light irradiation, the carbon-modified CHA-type zeolite photocatalyst can completely degrade rhodamine B within 60 min, exhibiting an excellent ability of visible light-driven photocatalytic degradation of pollutants. In contrast, pure ...

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Abstract

The invention provides a visible-light-induced photocatalyst, and a preparation method and application thereof. The invention first provides a carbon-modified zeolitic material. The carbon-modified zeolitic material comprises carbon existing in the form of being doped into a zeolitic framework and/or attached to interiors of pores, wherein the content of carbon is 0.01%-90% based on 100% of the total weight of the zeolitic material. According to the preparation method, an organic template agent in parent zeolite can be converted into carbon by regulating and controlling calcining conditions inthe preparation process of zeolite, so the carbon is doped into the framework of the zeolite and/or attached into zeolite holes, and thus, the energy band gap width of the zeolite is effectively reduced, and the zeolite is converted into a visible-light-induced photocatalyst from a non-visible-light-induced material. The carbon-modified visible-light-induced zeolite photocatalyst provided by theinvention is safe to use, free of biotoxicity and excellent in photocatalytic performance, has the potential of large-scale production and application, and can be widely applied to the fields of air purification, water pollution prevention and control, sterilization and disinfection, deodorization and the like.

Description

technical field [0001] The invention relates to a visible light catalyst and its preparation method and application, belonging to the technical field of functional materials. Background technique [0002] Semiconductor photocatalysts can generate holes and electrons with redox effects under suitable light sources (such as sunlight), which can be used to efficiently degrade pollutants. Therefore, photocatalytic technology is considered to be an effective way to solve the problem of environmental pollution. However, most photocatalysts in the prior art can only be excited by ultraviolet light. Ultraviolet light accounts for only 4% of the solar spectrum, which seriously hinders the widespread application of photocatalysts. [0003] In addition, the preparation of photocatalysts needs to consider the cost and scale, but the synthesis of photocatalysts in the prior art is complicated and costly, and it is currently difficult to produce and apply them on a large scale. Conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J35/02A01N59/00A01N59/06C02F1/30C02F1/50C02F1/28B01D53/74B01D53/86B01J20/18B01D53/72B01J20/30C02F101/38C02F101/30
CPCB01J35/004B01J29/7015B01J29/7007B01J35/023C02F1/30C02F1/281A01N59/00A01N59/06B01J20/18B01D53/8668B01D53/74C02F2305/10C02F2101/38C02F2101/308C02F2303/04
Inventor 鲁雪
Owner 鲁雪
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