Preparation method of Cu-Fe bimetal complexing type magnetic chitosan carbon aerogel catalyst applied to wet oxidation

A bimetallic complex, wet oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of poor catalyst stability and low catalyst metal loading. , the problem of easy loss of active components, etc., to achieve the effects of good stability, low dissolution, and stable COD removal rate in effluent

Active Publication Date: 2021-01-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional catalyst preparation method uses carbon material as the carrier, transition metal as the active component, and uses the method of impregnation and roasting for loading. The catalyst prepared by this method has a low metal loading, the active component is easy to lose, and the stability of the catalyst is poor.

Method used

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  • Preparation method of Cu-Fe bimetal complexing type magnetic chitosan carbon aerogel catalyst applied to wet oxidation
  • Preparation method of Cu-Fe bimetal complexing type magnetic chitosan carbon aerogel catalyst applied to wet oxidation
  • Preparation method of Cu-Fe bimetal complexing type magnetic chitosan carbon aerogel catalyst applied to wet oxidation

Examples

Experimental program
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Effect test

example 1

[0026] Example 1. Catalyst Preparation Specific Embodiment 1

[0027] Weigh 0.03mol copper nitrate trihydrate and 0.01mol ferrous chloride tetrahydrate respectively, and dissolve them in 960ml deionized water to form a solution. And weigh 30g of chitosan in the solution to form a suspension, add 40ml of acetic acid while stirring until a sol is formed. Cu in the formed sol 2+ Concentration is 0.03mol / L, Fe 2+ The concentration is 0.01mol / L. Vacuum for 12 hours to remove air bubbles. The sol was extracted with a syringe, and 1 L of a sodium hydroxide solution with a concentration of 1.25 mol / L was added dropwise to carry out deprotonation curing for 4 hours. Soak and wash with deionized water until the filtrate is neutral, and place it in a freezer at -12°C for 12 hours. The pellets were lyophilized in a lyophilizer for 72 hours without thawing. The freeze-dried airgel was calcined at 800 °C for 2 hours in a nitrogen atmosphere to complete the carbonization process (in th...

example 2

[0038] Example 2. Catalyst Preparation Specific Embodiment 2

[0039] Weigh 0.05 mol of copper nitrate trihydrate and 0.02 mol of ferrous chloride tetrahydrate respectively, and dissolve them in 950 ml of deionized water to form a solution. And weigh 36g of chitosan in the solution to form a suspension, add 50ml of acetic acid while stirring until a sol is formed. Cu in the formed sol 2+ Concentration is 0.05mol / L, Fe 2+ The concentration is 0.02mol / L. Vacuum for 12 hours to remove air bubbles. The sol was drawn out with a syringe, and 1 L of a sodium hydroxide solution with a concentration of 1.5 mol / L was added dropwise to carry out deprotonation curing for 4 hours. Soak and wash with deionized water until the filtrate is neutral, and place it in a freezer at -12°C for 12 hours. The pellets were lyophilized in a lyophilizer for 72 hours without thawing. The freeze-dried airgel was calcined at 820°C for 2 hours in a nitrogen atmosphere to complete the carbonization proc...

example 3

[0050] Example 3. Catalyst Preparation Specific Embodiment 3

[0051] Weigh 0.08mol copper nitrate trihydrate and 0.04mol ferrous chloride tetrahydrate respectively, and dissolve them in 920ml deionized water to form a solution. And weigh 42g of chitosan in the solution to form a suspension, add 80ml of acetic acid while stirring until forming a sol. Cu in the formed sol 2+ Concentration is 0.08mol / L, Fe 2+ The concentration is 0.04mol / L. Vacuum for 12 hours to remove air bubbles. The sol was extracted with a syringe, and 1 L of a sodium hydroxide solution with a concentration of 2 mol / L was added dropwise to carry out deprotonation curing for 4 hours. Soak and wash with deionized water until the filtrate is neutral, and place it in a freezer at -12°C for 12 hours. The pellets were lyophilized in a lyophilizer for 72 hours without thawing. The freeze-dried airgel was calcined at 850°C for 2.5 hours in a nitrogen atmosphere to complete the carbonization process (in the he...

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Abstract

The invention discloses a preparation method of a Cu-Fe bimetal complexing type magnetic chitosan carbon aerogel catalyst applied to wet oxidation, and belongs to the field of environmental functionalmaterials. Chitosan carbon is used as a carrier, CuO, Cu2O, Fe3O4 and FeO are used as main active components, and the complex catalyst is prepared. According to the preparation of the catalyst, Cu-Fecomplexing type sol is prepared by utilizing the complexing action between chitosan molecules and metal ions. The preparation method comprises dropwise adding the sol into a sodium hydroxide solution, carrying out deprotonation and solidification to form small balls, washing with water, freezing, freeze-drying and calcining to prepare the magnetic aerogel catalyst. The catalyst prepared in the invention has a large specific surface area, the carrier and the metal active component are combined through complexation, the disadvantages of low loading component and easy dissolution of traditionalimpregnation methods are avoided, and the catalyst can be recovered by using an external magnetic field. When the catalyst is used for wet oxidation treatment of landfill leachate nanofiltration concentrate, it is found that the removal effect on humic acid and fulvic acid is good, and the COD removal rate can reach 74.6%-86.8%.

Description

technical field [0001] The patent relates to a catalyst preparation method for wet oxidation treatment of landfill leachate membrane filtration concentrate, which belongs to the technical field of environmental functional materials. Background technique [0002] The rapid increase in the amount of urban garbage has made the treatment of landfill leachate an urgent problem to be solved. In 2010, the Ministry of Environmental Protection issued the "Technical Specifications for Landfill Leachate Engineering (Trial)", and the nanofiltration membrane technology and reverse osmosis technology were recommended as advanced treatment processes for landfill leachate. And has been adopted in many landfills. Although membrane technology can remove most of the pollutants, it will produce about 20% to 30% membrane filtration concentrate. Especially the nanofiltration membrane concentrate has high COD, large chroma, and poor biodegradability. The total dissolved organic matter in the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/08B01J21/18C02F1/72C02F101/30C02F103/06
CPCB01J23/745B01J35/0033B01J37/082B01J37/084B01J21/18C02F1/725C02F1/722C02F2101/30C02F2103/06
Inventor 秦侠郭城睿
Owner BEIJING UNIV OF TECH
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