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Manganese dioxide-magnetic biochar composite catalyst as well as preparation method and application thereof

A technology of composite catalyst and manganese dioxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of difficult recovery of manganese dioxide and pollutant adsorption capacity Weakness and other problems, to achieve the effect of shortening the migration path, improving the effective utilization rate, and good adsorption performance

Active Publication Date: 2020-01-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problems that manganese dioxide is not easy to recycle and has weak adsorption capacity for pollutants, the present invention obtains a multilayer structure catalytic material with simple process, low cost and high catalytic activity and a preparation method thereof, that is, a manganese dioxide-magnetic Biochar composite catalyst and preparation method thereof

Method used

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  • Manganese dioxide-magnetic biochar composite catalyst as well as preparation method and application thereof
  • Manganese dioxide-magnetic biochar composite catalyst as well as preparation method and application thereof
  • Manganese dioxide-magnetic biochar composite catalyst as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0043] In this embodiment, the steps of the preparation method of the manganese dioxide-magnetic biochar catalyst are as follows:

[0044] 1) Put the grapefruit peel as biomass in a crucible, cover it and put it in a muffle furnace, pyrolyze it for 2 hours under oxygen-limited conditions at 800°C to generate biochar, wash it with deionized water and absolute ethanol, respectively After washing three times, dry, grind and sieve to obtain biochar A;

[0045] 2) Add 5.56g of ferrous sulfate heptahydrate and 3.244g of ferric chloride to 500ml of deionized water and mix uniformly to prepare an iron salt solution. Add 3g of biochar A to the iron salt solution and mix evenly (at this time, the biochar A The mass concentration is 2 mg / mL, the mass concentration of ferrous ions in the ferrous salt is 0.48 mg / mL, and the mass concentration of ferrous ions in the ferric salt is 0.96 mg / mL), so that the ferrous ions and ferrous ions are uniformly dispersed on the surface of the biochar; Add 1...

Embodiment 2

[0055] The manganese dioxide-magnetic biochar prepared in Example 1 and each control material were added to the solution containing potassium persulfate and 4-chlorophenol, and the concentration of each material added was 0.2g / L, 4-chlorophenol The concentration is 10mg / L, the potassium persulfate concentration is 10mmol / L, react for 180 minutes, take samples at 0, 5, 10, 20, 30, 45, 60, 90, 120, and 180 minutes to determine the concentration of 4-chlorophenol . The experimental results are as Figure 5 As shown, it can be seen that the manganese dioxide-magnetic biochar can still effectively activate potassium persulfate and has a better removal rate for 4-chlorophenol. However, the activity of manganese dioxide-biochar and manganese dioxide-ferric oxide is much lower than that of manganese dioxide-magnetic biochar. This is because the magnetic biochar can still retain the α-manganese dioxide structure, while the ferroferric oxide and biochar destroy its structure. In additi...

Embodiment 3

[0057] The manganese dioxide-magnetic biochar prepared in Example 1 and the control materials were added to the 4-chlorophenol solution, the concentration of each material added was 0.2g / L, and the concentration of 4-chlorophenol was 10mg / L. Reaction for 180 minutes, samples were taken at 0, 5, 10, 20, 30, 45, 60, 90, 120, and 180 minutes to determine the concentration of 4-chlorophenol. The experimental results are as Figure 7 As shown, it can be seen that both manganese dioxide-biochar and manganese dioxide-magnetic biochar have a certain adsorption capacity for 4-chlorophenol, while manganese dioxide and manganese dioxide-ferric tetroxide have a certain adsorption capacity for 4-chlorophenol. The adsorption capacity of chlorophenol is very weak.

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Abstract

The invention discloses a manganese dioxide-magnetic biochar composite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) pyrolyzing biomass under anaerobic or oxygen-limited conditions to generate biochar, washing with water and alcohol for three times respectively, drying, grinding and sieving; 2) uniformly stirring a ferricsalt and a ferrous salt in an aqueous solution, then adding the prepared biochar, and then adding an alkali liquor; under heating, conveying an obtained coprecipitate into ferroferric oxide, and obtaining magnetic biochar; washing with watert for three times, drying, grinding and sieving; 3) adding the magnetic biochar into a manganese salt solution, and uniformly stirring; then adding a potassium permanganate solution, uniformly mixing and heating at a high temperature for a period of time. The method is simple in process, low in cost, and is capable of achieving large-scale industrial production. The prepared manganese dioxide-magnetic biochar composite catalyst is excellent in catalytic performance, can be applied to degradation and removal of various pollutants, is easy to recycle, and is an efficient catalyst.

Description

Technical field [0001] The invention relates to the technical field of environmental catalytic material preparation, in particular to a manganese dioxide-magnetic biochar composite catalyst and a preparation method and application thereof. Background technique [0002] With the development of industry, the types of pollutants discharged into the environment have increased dramatically. Some organic pollutants are difficult to remove by common biological methods due to their refractory characteristics. Therefore, in recent years, a large number of studies on the application of advanced oxidation technology to the treatment of refractory organic pollutants have been carried out. Persulfate is an economical and efficient in-situ repair oxidant. Manganese dioxide can activate persulfate to produce singlet oxygen to degrade organic pollutants. It is considered to be a promising persulfate due to its wide distribution in nature, low ecotoxicity, easy preparation, and high catalytic ac...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/28C02F1/72C02F101/34C02F101/36
CPCB01J23/8892B01J23/002C02F1/283C02F1/72C02F2101/345C02F2101/36B01J35/33
Inventor 朱小萤周豪陈宝梁
Owner ZHEJIANG UNIV
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