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Heterojunction type Fenton-like catalyst and preparation method thereof, and special system and method

A catalyst and heterojunction technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve unsatisfactory effects of fluorine-containing wastewater, low concentration that can be treated by adsorption method, and sludge Problems such as high moisture content, to achieve the effect of facilitating transfer, promoting effective decomposition, and increasing specific surface area

Pending Publication Date: 2021-11-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical precipitation method is widely used in industry, but the sludge produced during the precipitation process has high moisture content, low recovery value, and difficult disposal, while the treatment concentration of adsorption method is low, the price is relatively high, and it is easy to cause secondary pollution
Advanced oxidation technology is relatively mature for the treatment of high COD wastewater, but due to the strong electronegativity of fluorine, it is easy to cause catalyst poisoning, and the effect of treating fluorine-containing wastewater is not ideal

Method used

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  • Heterojunction type Fenton-like catalyst and preparation method thereof, and special system and method
  • Heterojunction type Fenton-like catalyst and preparation method thereof, and special system and method
  • Heterojunction type Fenton-like catalyst and preparation method thereof, and special system and method

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Effect test

Embodiment 1

[0045] like figure 1 As shown, the dedicated system for catalyst degradation of high COD fluorine-containing wastewater includes a reaction module, a heat exchange module, a precipitation module, and an exhaust gas absorption module. The reaction module includes a reaction tank 6, wherein the top of the reaction tank 6 is provided with a safety valve 11, a pressure gauge 12 and an exhaust valve 13, and the inside of the reaction tank 6 is divided into two catalytic reaction zones a and b and an outlet zone c. Area c is divided into two parts, and the tops of area a and area b of the catalytic reaction area communicate with both parts of area c. The two catalytic reaction zones of the reaction tank 6 are provided with alternately stacked catalyst filling areas 7 and θ rings 8. The interior of the reaction tank 6 is divided into two catalytic reaction zones. The upper part is provided with a demister 9. The side of the reaction tank 6 The wall is provided with a liquid level se...

Embodiment 2

[0057] (1) LaFe 0.7 Cu 0.3 o 3 preparation of

[0058] According to the molar ratio of 1:0.7:0.3, weigh 2.1650 g of lanthanum nitrate hexahydrate, 1.4140 g of iron nitrate nonahydrate, and 0.3624 g of copper nitrate trihydrate, and dissolve them in 10 mL of distilled water to obtain liquid A. According to the total molar ratio of lanthanum, iron, copper metal ions and maleic acid molar ratio of 1:1.3, weigh 1.5089g maleic acid and 0.05g Z-type foaming agent and dissolve them in 40mL distilled water to obtain liquid B. Add it dropwise to liquid A at a flow rate of 0.5mL / min, and stir the whole dropping process in a water bath at 80°C. React until a sol-gel form is formed, dry the resulting gel in a blast drying oven at 80°C overnight, grind to obtain a precursor powder, then raise the temperature of the precursor powder to 600°C at 5°C / min, keep it warm for 2 hours, and continue to heat at 5°C Raise the temperature to 800°C per minute, keep it warm for 2 hours, and obtain m...

Embodiment 3

[0068] (1) LaFe 0.5 Cu 0.5 o 3 preparation of

[0069] According to the molar ratio of 1:0.5:0.5, weigh 2.1650 g of lanthanum nitrate hexahydrate, 1.0100 g of iron nitrate nonahydrate, and 0.6040 g of copper nitrate trihydrate, and dissolve them in 10 mL of distilled water to obtain liquid A. According to the total molar ratio of lanthanum, iron and copper metal ions to citric acid molar ratio of 1:1.2, weigh 2.5217g of citric acid and 0.05g of G-type foaming agent and dissolve them in 40mL of distilled water to obtain liquid B. Add dropwise to liquid A at a flow rate of mL / min, and the entire dropping process is carried out with stirring in a water bath at 80°C. React until a sol-gel form is formed, dry the resulting gel in a blast drying oven at 85°C overnight, grind to obtain a precursor powder, then raise the temperature of the precursor powder to 600°C at 5°C / min, keep it warm for 2 hours, and then continue for 5 ℃ / min to 800 ℃, heat preservation for 2h, after natural...

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Abstract

The invention discloses a heterojunction type Fenton-like catalyst for degrading high-COD fluorine-containing wastewater and a preparation method and application thereof, and a special system and method, wherein the heterojunction type Fenton-like catalyst has the general formula of LaFe(1-x)CuxO3 / YMoS2, x is 0.1-0.5, and Y is 0.1-0.5. The catalyst disclosed by the invention is obtained by doping Cu into LaFeO3 to obtain LaFe(1-x)CuxO3 and then carrying out compound modification on LaFe(1-x)CuxO3 and a semiconductor MoS2. The matched treatment system is high in fluorine corrosion resistance and resistant to strong acid and strong alkali, secondary pollution caused by gas emission is eradicated, secondary pollution caused by iron mud solid waste is avoided, meanwhile, waste gas absorption treatment and effective collection of fluorine elements are achieved, and environment friendliness is achieved. By adopting the catalyst and the matched treatment special system, the structural problems that high-COD fluorine-containing wastewater is difficult to treat, high in cost and the like can be solved, pollution is reduced, and sustainable development is promoted.

Description

technical field [0001] The invention relates to a composite catalyst, a preparation method and a special system and method, in particular to a heterojunction Fenton-like catalyst with high catalytic activity, good fluorine resistance, and capable of effectively degrading high-COD fluorine-containing wastewater and its The preparation method and the special supporting processing special system and method. Background technique [0002] The application of fluorine-containing products involves industrial production such as metal smelting, organic fluorine, phosphate fertilizers, pesticides, glass, electrolytic aluminum, pharmaceuticals and semiconductors. Among them, fluorine-containing organic polymer materials are widely used in fluorine refrigerants, fluorine coatings, fluorine rubber, fluorine Resin products, etc. According to statistics, fluorine-containing polymers account for about 20% of the total fluorine consumption in the entire fluorine chemical industry, and the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J23/83C02F1/72B01D53/18B01D53/14C02F101/14
CPCB01J27/051B01J23/83B01J23/002C02F1/725B01D53/18B01D53/14B01J2523/00C02F2101/14C02F2209/08B01J2523/17B01J2523/3706B01J2523/842
Inventor 吴敏张冰洁
Owner SOUTHEAST UNIV
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