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Porous material loaded multi-metal composite Fenton-like catalyst and preparation method and application thereof

A porous material and multi-metal technology, applied in the field of composite Fenton-like catalysts, can solve problems such as complex preparation process, unfavorable application, poor catalyst stability, etc., achieve high specific surface area, and broaden the effect of pH limit range

Pending Publication Date: 2022-02-08
HUBEI JUNJI WATER TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent has the following deficiencies in the actual use process: (1) The essence of the synthesis method is to precipitate the active metal oxides on the inner surface of the sepiolite pores by the impregnation method. As the catalytic degradation reaction proceeds, the Fe-Co oxides are easily It falls off from the sepiolite channel, resulting in poor catalyst stability; (2) Since the hardness of sepiolite decreases after absorbing water, it becomes soft, and the hardness recovers after drying, and the structure of the supported Fe-Co oxide is prone to occur before and after the reaction. change, the dispersion is reduced, and the deactivation of the catalyst is accelerated to a certain extent
This patent has the following defects: (1) in the actual degradation process, the dosage of hydrogen peroxide is relatively large, which is not conducive to the application in actual engineering
(2) The synthesized Fe-Na oxide is loaded in the pores of the molecular sieve, and as the reaction progresses, the oxides fall off from the surface of the molecular sieve and the pores, which reduces the stability of the catalyst
However, the preparation process is relatively complicated, and there are problems of solid-liquid separation and continuous operation in practical applications.

Method used

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  • Porous material loaded multi-metal composite Fenton-like catalyst and preparation method and application thereof
  • Porous material loaded multi-metal composite Fenton-like catalyst and preparation method and application thereof
  • Porous material loaded multi-metal composite Fenton-like catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of multi-metal composite type Fenton catalyst supported by porous material, its steps are:

[0036] (1) Prepare a mixed solution of iron sulfate and nickel chloride with a concentration of 1mol / L, in which the molar ratio of iron salt to nickel salt is 1:1, and soak activated alumina particles with a particle size of 3-5 mm in the mixed solution for 12 hours , dried at 80°C for 5 hours after filtering;

[0037] (2) Roast the product obtained from the above drying at 500°C for 5 hours, take it out and let it cool to room temperature for later use. figure 1 For the XRD spectrum of the compound type Fenton catalyst prepared in this embodiment, as can be seen from the figure, the diffraction peak of the compound type Fenton catalyst prepared in this embodiment is similar to that of Fe 2 o 3 The characteristic peaks of , NiO are consistent, and there is no significant difference before and after the reaction, indicating that the consumption of ...

Embodiment 2

[0040] A kind of preparation method of multi-metal composite type Fenton catalyst supported by porous material, its steps are:

[0041] (1) Prepare a mixed solution of ferric nitrate and manganese chloride with a concentration of 0.1mol / L, in which the molar ratio of iron salt to manganese salt is 0.8:0.2, and soak activated alumina particles with a particle size of 2 to 3 mm in the mixed solution 12h, after filtering, dry at 80°C for 5 hours;

[0042] (2) The above-mentioned dried product was roasted at 300° C. for 5 hours, and then taken out and allowed to cool to room temperature for later use.

[0043] Fenton-like catalytic degradation of landfill leachate experiment: Take 100g of composite Fenton-like catalyst and place it in a 500mL conical flask, add 300mL of landfill leachate with initial pH adjusted to 3, add 100mg / L hydrogen peroxide, and take samples at regular intervals to measure COD Concentration, repeated use results see image 3 , it can be seen from the figu...

Embodiment 3

[0045] A kind of preparation method of multi-metal composite type Fenton catalyst supported by porous material, its steps are:

[0046] (1) Prepare a mixed solution of ferric nitrate, nickel chloride and copper chloride with a concentration of 0.5mol / L. The molar ratio of ferric nitrate, nickel chloride and copper chloride is 0.7:0.2:0.1, impregnating the molecular sieve with the mixed solution Soak in water for 15 hours, filter and dry at 80°C for 5 hours;

[0047] (2) Roast the above-mentioned dried product at 400° C. for 5 hours, take it out and let it cool to room temperature for later use.

[0048] Fenton-like catalytic degradation of landfill leachate experiment: take 100 g of the composite Fenton-like catalyst prepared in this example and place it in a 500 mL Erlenmeyer flask, add 300 mL of landfill leachate whose initial pH was adjusted to 5, add 100 mg / L hydrogen peroxide, and Take a sample for a certain period of time to measure the COD concentration, and see the re...

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Abstract

The invention relates to the technical field of composite Fenton-like catalysts, in particular to a porous material loaded multi-metal composite Fenton-like catalyst and a preparation method and application thereof. The porous material loaded multi-metal composite Fenton-like catalyst comprises a porous material and metal oxide loaded on the porous material, and the metal oxide comprises ferric oxide and at least one transition metal oxide; in the metal oxide, the molar percentage of ferric oxide is 50%-80%. The porous material loaded multi-metal composite Fenton-like catalyst has a relatively high specific surface area through the structural characteristics of the porous material, so that more effective catalytic reaction contact surfaces are exposed, and more adsorption sites and catalytic active sites are provided; iron ions released by the catalyst can synergistically participate and promote double oxidation to generate hydroxyl radicals, so that the reaction process is accelerated; the amount of hydrogen peroxide and the amount of the catalyst needed to be added in the reaction process are small, and the catalyst can continuously and stably play a catalytic role.

Description

technical field [0001] The invention relates to the technical field of composite Fenton-like catalysts, in particular to a porous material-supported multi-metal composite Fenton-like catalyst, its preparation method and application. Background technique [0002] Fenton-like technology is an advanced oxidation water treatment technology that has been studied more in recent years. The hydroxyl radicals generated in the reaction system have high oxidizing properties, and their oxidizing properties are second only to oxyfluorides. They are highly active and non-selective , can effectively degrade a variety of biodegradable organic pollutants. Many scholars have carried out a lot of research on Fe-based metal oxides as Fenton-like catalysts, and made great progress. However, since iron oxide is magnetic, it is easy to agglomerate, which reduces the exposure of active sites, which is not conducive to the efficient degradation of pollutants by the catalyst, resulting in a rate of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/889B01J29/00C02F1/72
CPCB01J23/755B01J23/8892B01J29/00C02F1/725C02F1/722C02F2305/026
Inventor 刘鲁建阮霞张琴董俊刘卫勇李绍俊刘松陶威
Owner HUBEI JUNJI WATER TREATMENT
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