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Red mud-based heterogeneous catalyst, preparation method and pollutant degradation method

A heterogeneous catalyst and pollutant technology, applied in water pollutants, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low degradation efficiency and high catalyst cost, to promote uniform mixing and increase contact probability Effect

Active Publication Date: 2020-11-24
ZHENGZHOU UNIV
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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a red mud-based heterogeneous catalyst and its preparation method and pollutant degradation method, which solves the problem of high cost and low degradation efficiency of catalysts used in the degradation of organic pollutants in the prior art. question

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  • Red mud-based heterogeneous catalyst, preparation method and pollutant degradation method
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  • Red mud-based heterogeneous catalyst, preparation method and pollutant degradation method

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preparation example Construction

[0063] The present invention also provides a preparation method of red mud heterogeneous catalyst, comprising the following steps:

[0064] Step 1: Mix red mud and biomass evenly to obtain a mixture;

[0065] Step 2: heating the mixture, and performing a carbonization reaction under an inert atmosphere (for example, nitrogen or argon), to obtain a reaction product;

[0066] Step 3: cooling, washing and drying the reaction product in sequence to obtain a red mud heterogeneous catalyst.

[0067] The reaction formula involved in the above-mentioned preparation method is as follows:

[0068] C+Fe 2 o 3 → Fe 3 o 4 +CO

[0069] CO+3Fe 2 o 3 →2Fe 3 o 4 +CO 2

[0070] C+Fe 3 o 4 →3Fe 0 +4CO

[0071] Compared with the prior art, the beneficial effect of the preparation method of the red mud heterogeneous catalyst provided by the present invention is basically the same as that of the above-mentioned red mud heterogeneous catalyst, and will not be repeated here.

[0072]...

Embodiment 1

[0102] The red mud heterogeneous catalyst used in this embodiment has a particle size of 0.125 mm and a biomass particle size of 0.15 mm. The preparation method of the red mud heterogeneous catalyst is as follows:

[0103] Step 1: uniformly mix red mud and biomass to obtain a mixture, the mass ratio of red mud and biomass is 5:1;

[0104] Step 2: Raise the temperature to 200°C at a heating rate of 5°C / min, heat the mixture once, and keep it for 1 hour; raise the temperature to 1000°C at a heating rate of 10°C / min, heat the mixture after the first heating, and keep it warm 1.5h obtains reaction product;

[0105] Step 3: cooling the reaction product in sequence, washing with ethanol and deionized water, and drying to obtain a red mud heterogeneous catalyst. The yield of the catalyst is 83.67%, and the particle size of the catalyst is 0.125-0.15mm. Catalysts have a large specific surface area and a porous structure (see figure 1 ), and the infrared spectroscopic analysis of th...

Embodiment 2

[0107] The red mud heterogeneous catalyst used in this embodiment has a particle size of 0.15 mm and a biomass particle size of 0.25 mm. The preparation method of the red mud heterogeneous catalyst is as follows:

[0108] Step 1: uniformly mix red mud and biomass to obtain a mixture, the mass ratio of red mud and biomass is 1:1;

[0109] Step 2: Raise the temperature to 250°C at a heating rate of 10°C / min, heat the mixture once and keep it warm for 1.5h; raise the temperature to 800°C at a heating rate of 8°C / min, and heat the mixture after the first heating, Insulated for 2h to obtain the reaction product;

[0110] Step 3: cooling the reaction product in sequence, washing with methanol and deionized water, and drying to obtain a red mud heterogeneous catalyst. The yield of the catalyst is 67.48%, and the particle size of the catalyst is 0.125-0.15mm.

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Abstract

The invention discloses a red mud-based heterogeneous catalyst, a preparation method and a pollutant degradation method, belongs to the technical field of heterogeneous catalysts, and solves the problems of high cost and low degradation efficiency of a catalyst for organic pollutant degradation in the prior art. The red mud-based heterogeneous catalyst is prepared by carbonization reaction of redmud and biomass, and the mass ratio of the red mud to the biomass is 5: 1-1: 2. The preparation method includes the steps: uniformly mixing the red mud and the biomass; performing heating carbonization reaction on mixture; and sequentially cooling, cleaning and drying reaction products to obtain the red mud-based heterogeneous catalyst. The degradation method includes the steps: mixing the red mud-based heterogeneous catalyst, organic pollutant water solution and oxidizing agents; and performing stirring reaction on the mixture to degrade organic pollutants in the organic pollutant water solution. The red mud-based heterogeneous catalyst, the preparation method and the pollutant degradation method can be used for degrading the organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous catalysts, and in particular relates to a red mud-based heterogeneous catalyst, a preparation method, and a pollutant degradation method. Background technique [0002] Red mud is a strong alkaline solid waste produced by the alumina industry. Every ton of alumina produced will produce 1.0 to 2.5 tons of red mud. The stock of red mud in my country is about 400 to 800 million tons. Red mud has fine particles, strong alkalinity and heavy metal content, which is harmful to the environment. From the perspective of resources, red mud contains valuable metals such as iron, aluminum, titanium, and rare earths. However, the grades of the above-mentioned metals are low, and the economic efficiency of recycling is poor. The development of high-value functional materials is of great significance to the comprehensive utilization of red mud. Significance. [0003] Utilizing the physical and chemical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/72C02F101/30
CPCB01J23/745C02F1/722C02F2101/30
Inventor 王重庆曹亦俊
Owner ZHENGZHOU UNIV
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