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Application of crystal face controllable bismuth oxybromide catalyst in selective oxidative degradation of pollutants

A bismuth oxybromide and catalyst technology are applied in the application field of crystal face-controllable bismuth oxybromide catalyst in the selective oxidation and degradation of pollutants, and can solve the problem of pH applicable range, unknown resistance to environmental interference, difficult advanced oxidation water treatment Process, poor catalytic activity and other problems, to achieve the effect of huge application potential, low leakage rate, strong anti-interference

Pending Publication Date: 2021-11-19
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recent studies have attempted to use the flower-like BiOBr microsphere material (mixed crystal phase) to activate PMS to degrade organic pollutants, but its catalytic activity is poor (only up to 86.6% bisphenol A is removed within two hours), and the catalytic reaction pathway is Mixed pathway, that is, the generated superoxide anion (·O 2 – ), singlet oxygen (1O 2 ), SO 4 · - Both OH and OH play a certain role in the degradation of pollutants
Moreover, the applicable pH range and the ability to resist environmental interference of the material are unknown
Therefore, the existing BiOBr materials are difficult to be used in advanced oxidation water treatment process

Method used

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  • Application of crystal face controllable bismuth oxybromide catalyst in selective oxidative degradation of pollutants
  • Application of crystal face controllable bismuth oxybromide catalyst in selective oxidative degradation of pollutants
  • Application of crystal face controllable bismuth oxybromide catalyst in selective oxidative degradation of pollutants

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preparation example Construction

[0039] The invention provides a method for preparing a bismuth oxybromide catalyst with controllable crystal planes, comprising: S1) mixing a bismuth source, a potassium source and nitric acid in water, adjusting the pH value of the mixed solution to weak acidity, and obtaining a precursor solution; S2) heating the precursor solution to carry out a hydrothermal reaction to obtain a bismuth oxybromide catalyst with controllable crystal facets.

[0040] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0041] Mix the bismuth source, the potassium source and nitric acid in water; the bismuth source is preferably an inorganic bismuth salt, more preferably bismuth nitrate; the potassium source is preferably an inorganic potassium salt, more preferably potassium halide, and more preferably potassium bromide The molar ratio of the bismuth source to the potassium source is preferably 1: (1-1.5), more...

Embodiment 1

[0052] Add 1.94 g of bismuth nitrate pentahydrate into the beaker, add 10 mL of 1 mol / L nitric acid solution, and stir to dissolve.

[0053] Take another clean beaker, add 0.595g potassium bromide, add 50mL deionized water, stir to dissolve.

[0054] Under continuous magnetic stirring, the bismuth nitrate solution was slowly added dropwise to the potassium bromide solution. After mixing and stirring, the pH value of the mixed solution was adjusted to 6 with 2 mol / L sodium hydroxide solution to obtain a milky white precursor solution.

[0055] The obtained milky white precursor solution was transferred to a polytetrafluoroethylene reactor liner with a capacity of 100 ml. After putting on a stainless steel kettle cover, put it in an oven and gradually raise the temperature to 160 degrees Celsius, carry out a hydrothermal reaction for 12 hours, and then cool it down naturally. Dry in a blast drying oven at 60 degrees Celsius to obtain BiOBr material powder, which is denoted as B...

Embodiment 2

[0069] Embodiment 2: BiOBr-PMS system is used for actual water sample and multiple pollutant treatment

[0070] Add the BiOBr-{010} material powder obtained in Example 1 into a 10mg / L bisphenol solution, and then add 5mM / L sodium carbonate, sodium bicarbonate, sodium chloride, sodium sulfate and potassium nitrate to test The effect of common anions in the system, Figure 7 is the degradation rate curve of bisphenol A in the BiOBr-{010} / PMS system in the presence of common anions in the aqueous environment. Depend on Figure 7 It can be seen that within 20 minutes, different anions common in the water environment have little effect on the degradation of bisphenol A in the BiOBr-PMS system, among which carbonate and bicarbonate can significantly improve the removal efficiency of bisphenol A, which may be Associated with the hydrolysis of carbonate and bicarbonate resulting in a weakly alkaline environment. Chloride ions, nitrate ions and sulfate ions had little effect on the ...

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Abstract

The invention provides application of a crystal face controllable bismuth oxybromide catalyst in activation of peroxymonosulfate. Compared with the prior art, bismuth oxybromide is added into water containing organic pollutants, peroxymonosulfate is added for oxidative degradation, the leakage rate of metal bismuth in the process is low, bismuth oxybromide does not change before and after reaction, the material can be recycled, no toxic by-product is generated, the anti-interference performance is high, pollutants can be efficiently and selectively removed in a relatively wide pH range (4-10), and the application has huge application potential in the field of actual water treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to the application of a crystal face controllable bismuth oxybromide catalyst in the selective oxidation degradation of pollutants. Background technique [0002] Advanced oxidation technology based on persulfate has broad application prospects in environmental pollution control, especially in the removal of refractory organic pollutants. The key to determining the application effect of this type of technology lies in the use of high-efficiency catalysts. At present, low-cost transition metal oxide catalysts are often used to activate PMS to generate sulfate radicals (SO 4 · - ) and hydroxyl radicals (·OH) to degrade various organic pollutants. However, in the actual water treatment application, this technology has problems such as being interfered by environmental ions (such as chloride ions, bicarbonate ions) and dissolved organic matter, generating toxic inte...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J27/06B01J37/10C02F101/30
CPCC02F1/725B01J27/06B01J37/10C02F2101/30B01J35/23
Inventor 李文卫席寒陈飞柳后起
Owner UNIV OF SCI & TECH OF CHINA
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