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Biochar doped BiOBrxCl < 1-x > photocatalyst, preparation method and application

A photocatalyst, biochar technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc. Limits and other issues to achieve the effect of saving resources, reducing consumption, and high stability

Pending Publication Date: 2021-08-24
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional methods for treating RhB include physical methods, biological methods and chemical methods. However, traditional physical methods can only adsorb or filter RhB, but cannot completely remove RhB; chemical methods are easy to cause secondary pollution; Therefore, seeking new and efficient technologies for treating printing and dyeing wastewater has become an urgent problem to be solved.

Method used

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  • Biochar doped BiOBrxCl &lt; 1-x &gt; photocatalyst, preparation method and application
  • Biochar doped BiOBrxCl &lt; 1-x &gt; photocatalyst, preparation method and application
  • Biochar doped BiOBrxCl &lt; 1-x &gt; photocatalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: BiOBr 0.2 Cl 0.8 Preparation of photocatalyst:

[0036] (1) Weighing 9.7014g of bismuth nitrate pentahydrate and 2mL of concentrated nitric acid with a mass fraction of 68% were dissolved in 20mL of deionized water, and stirred to obtain a transparent liquid; In deionized water, quickly mix the two solutions with stirring.

[0037] (2) Centrifuge the obtained suspension at 5000r / min, collect the white precipitate, wash it with deionized water three times, dry it in the air at 60°C, and then calcinate it in the air at 300°C for 1h to obtain BiOBr 0.2 Cl 0.8 .

[0038] (3) Take 25mg BiOBr 0.2 Cl 0.8 Add 10mg / L RhB (50mL) solution, react in the dark for 30min to achieve adsorption-desorption equilibrium, then turn on a 350W xenon lamp for visible light catalytic degradation, and add a filter with a cutoff wavelength of 420nm.

[0039] According to above-mentioned method, adjust the ratio of ammonium bromide and ammonium chloride, prepare following photoca...

Embodiment 2

[0041] Embodiment 2: biochar doping BiOBr 0.2 Cl 0.8 Preparation of photocatalyst

[0042] (1) Wash the dust on the surface of the bamboo leaves with deionized water, dry them in an oven at 60° C., and grind them with a pulverizer to obtain bamboo leaf powder. The bamboo leaf powder that takes by weighing 8.00g is dissolved in the ZnCl of 350mL 1mol / L 2 In the solution, after stirring, use a 0.22 μm filter membrane to filter and wash, put it in a 60°C oven for drying, add 10mL deionized water and 8.00g NaOH for activation treatment, and store in a sealed oven for drying at 60°C. The product was placed in a quartz tube furnace for 2h, 750°C cracking reaction. Wash the cracked powder with water to neutrality and then dry at 60°C to prepare biochar. The structure of the prepared biochar is as follows: image 3 As shown, it can be seen from the transmission electron microscope image of the biochar prepared in this example that the biochar (BC) has a regular floc structure with...

Embodiment 3

[0048] Embodiment 3: biochar doping BiOBr 0.2 Cl 0.8 Preparation of photocatalyst

[0049] (1) Wash the dust on the surface of the bamboo leaves with deionized water, dry them in an oven at 60° C., and grind them with a pulverizer to obtain bamboo leaf powder. The bamboo leaf powder that takes by weighing 8.00g is dissolved in the ZnCl of 400mL 1mol / L 2 solution, stirred and washed with 0.22 μm suction filter, placed in a 60°C oven for drying, then added 10mL deionized water and 8.00g NaOH for activation treatment, sealed and stored in a 60°C oven for drying. The product was placed in a quartz tube furnace for 2.5h, 750°C cracking reaction. The cracked powder was washed with water to neutral and then dried at 60°C to prepare biochar.

[0050] (2) Weighing 9.7014g of bismuth nitrate pentahydrate and 2mL of concentrated nitric acid with a mass fraction of 68% were dissolved in 20mL of deionized water, and stirred to obtain a transparent liquid; In deionized water, quickly m...

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Abstract

The invention discloses a biochar doped BiOBrxCl < 1-x > photocatalyst and a preparation method and application thereof. The photocatalyst is biochar doped BiOBrxCl < 1-x >, and x ranges from 0 to 1; the doping amount of the biochar is metered by the mass of Bi in the BiOBrxCl < 1-x > catalyst, and the mass ratio of the biochar to the Bi in the BiOBrxCl < 1-x > catalyst is (1-20): (417.96). The preparation method of the biochar doped BiOBrxCl < 1-x > photocatalyst prepared by the method is simple and efficient, the materials are cheap, the photocatalyst is green and environment-friendly, and under the condition that a small amount of biochar is doped, the system can perform efficient catalytic degradation on rhodamine B in water under visible light.

Description

technical field [0001] The invention relates to a biochar-doped photocatalyst and a preparation method thereof, in particular to a biochar-doped BiOBr x Cl 1-x Photocatalyst, preparation method and application. Background technique [0002] Bi-based photocatalysts have the characteristics of low toxicity, rich elements and excellent activity, making them a type of catalyst that has attracted much attention in the field of visible light catalysis. However, the unique crystal structure and electronic structure of BiOX (X=Cl, Br and I), a compound of the Sillén group, has attracted more and more attention and research. However, due to the large forbidden band width of BiOCl (E g =3.20-3.50eV), only responds to ultraviolet light in sunlight. Due to the high recombination rate of photogenerated electron-hole pairs in BiOCl, its photocatalytic activity is low. BiOX's [Bi 2 o 2 ] 2+ layer and double halide ion layer nested structure can form BiOX x Y 1-x (X,Y=Cl,Br,I), su...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J35/02C02F1/30C02F101/38
CPCB01J27/06C02F1/30C02F2101/38C02F2305/10B01J35/40B01J35/39
Inventor 何欢李鸿渐季秋忆朱诺亚孙慧伦向伟铭程心滢孔祥程杨绍贵李时银
Owner NANJING NORMAL UNIVERSITY
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