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Preparation method and application of photocatalyst

A technology of photocatalyst and ammonium chloride, which is applied in the field of photocatalysis, can solve the problems of high cost, cumbersome steps, and unsatisfactory photocatalytic effect, and achieve the effects of improving catalytic stability, catalytic activity, and specific surface area

Active Publication Date: 2018-11-30
BINZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the steps are cumbersome and the cost is high; although the catalyst has a large specific surface area, reaching 86 m 2 / g, but BiOCl and C 3 N 4 Only through simple physical mixing, it is difficult to significantly increase the number of contact surfaces of the two substances, resulting in unsatisfactory photocatalytic effect
[0010] Therefore, the existing BiOCl / g-C 3 N 4 The photocatalyst preparation method has the disadvantages of cumbersome steps, high cost, strict process conditions, and unsatisfactory catalytic performance of the obtained catalyst.

Method used

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  • Preparation method and application of photocatalyst
  • Preparation method and application of photocatalyst
  • Preparation method and application of photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Under the atmosphere of nitrogen gas in a closed container, guanidine hydrochloride, ammonium chloride and bismuth nitrate were mixed according to a mass ratio of 1:0.7:0.15, and then high-energy ball milling was performed for 30 minutes to obtain powder. The ball milling speed during high-energy ball milling in this embodiment 200 r / min, the ball-to-material ratio is 10:1, and the ball filling coefficient is 7%; then the mixture obtained by high-energy ball milling is moved into a closed alumina crucible, placed in a muffle furnace with air, and heated at 7°C / min to 550°C, calcined for 2.5 hours, and cooled to room temperature to obtain BiOCl / g-C 3 N 4 Layered heterojunction photocatalysts. The catalyst has a specific surface area of ​​102 m 2 / g.

[0035] Depend on figure 1 It can be seen that through the detection of nitrogen adsorption-desorption technology, it is found that in the range of relative pressure (P / Po) = 0.5-1.0, a hysteresis loop appears on the is...

Embodiment 2

[0044] Under the atmosphere of nitrogen gas in a closed container, guanidine hydrochloride, ammonium chloride and bismuth nitrate were mixed according to the mass ratio of 1:1:0.2, and then high-energy ball milling was performed for 60 minutes to obtain powder. The ball milling speed during the high-energy ball milling process was 180 rev / min, the ball-to-material ratio is 8:1, and the ball filling coefficient is 5%; then the mixture is moved into a closed alumina crucible, placed in a muffle furnace, and heated to 500°C at 3°C / min. Roasting for 3 hours, down to room temperature, to obtain BiOCl / g-C 3 N 4 Layered heterojunction photocatalysts. The catalyst has a specific surface area of ​​96 m 2 / g.

[0045] Evaluation conditions: In the waste water of 20 mg / L tetracycline hydrochloride and 20 mg / L cephradine, the mass of catalyst added is 0.6 mg / mL based on the volume of waste water, and the wavelength in the range of 420-800 nm Under the irradiation of light source, the ...

Embodiment 3

[0048] Under the atmosphere of nitrogen gas in a closed container, guanidine hydrochloride, ammonium chloride and bismuth nitrate were mixed according to the mass ratio of 1:0.5:0.1, and then high-energy ball milling was performed for 20 minutes to obtain powder. The ball milling speed during the high-energy ball milling process was 250 rpm, the ball-to-material ratio is 15:1, and the ball filling factor is 9%; then the mixture is moved into a closed alumina crucible, placed in a muffle furnace with air, and the temperature is raised to 650°C at 10°C / min. Calcined for 2.0 hours, down to room temperature, to obtain BiOCl / g-C 3 N 4 Layered heterojunction photocatalysts. The catalyst has a specific surface area of ​​90 m 2 / g.

[0049] Evaluation conditions: In 40 mg / L wastewater containing cephradine, the amount of catalyst added is 1.5 mg / mL based on the volume of wastewater, under the irradiation of a light source with a wavelength of 420-800 nm, the reaction is stirred at ...

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Abstract

The invention discloses a preparation method and application of a photocatalyst, and belongs to the field of photocatalysis. According to the preparation method, guanidine hydrochloride, ammonium chloride and bismuth nitrate are used as raw materials, and high-energy ball milling treatment is carried out in a closed container under a protective gas atmosphere, then roasting is carried out, and theBiOCl / g-C3N4 layered heterojunction photocatalyst is synthesized. The preparation method disclosed by the invention is simple in steps, the obtained catalyst is good in stability, and the degradationrate of tetracycline hydrochloride and / or cefradine in water through the use of the obtained catalyst is up to 99% or above. In the method disclosed by the invention, no solvent is used, so that themethod is environmentally friendly, economic and practical, meets the actual production requirements, and can be popularized and used in a large scale.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a preparation method and application of a photocatalyst. Background technique [0002] With the rapid development of the pharmaceutical industry, antibiotics are widely used in various regions. Antibiotics can enter the environment in many ways, such as the abuse of antibiotics and the discharge of antibiotic-containing wastewater. Due to the characteristics of high biological toxicity and antibacterial substances in antibiotic wastewater, traditional physical adsorption and biological treatment methods are not effective in treating this kind of refractory toxic organic wastewater, especially wastewater containing trace antibiotic residues. In order to solve the environmental crisis caused by antibiotic wastewater, many methods have been tried. In recent years, photocatalytic technology has attracted widespread attention as a method for treating antibiotic wastewater with wide app...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J35/10C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J27/24B01J37/082C02F2305/10C02F2101/38C02F2101/36C02F2101/34B01J35/60B01J35/39
Inventor 段永正商希礼贾冬梅张岩冲李长海
Owner BINZHOU UNIV
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