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Preparation method and application of coated S-Fe/Co@C bimetallic catalyst derived from ZIF-67

A ZIF-67, bimetallic catalyst technology, applied in the field of catalysis, can solve the problems of poor stability, more metal ion leaching, and lower metal ion leaching rate, etc., to solve poor stability, enhance electron transfer rate, and solve oxidation and agglomeration Effect

Pending Publication Date: 2021-08-20
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the defects of ZIF-67 such as poor stability in water and more metal ions leaching, sulfide nano-zero-valent iron was introduced into ZIF-67, and the metal ion leaching rate was reduced through the strong electron transfer between iron-cobalt bimetals, and then carbonized to make Transformation of metal-organic frameworks into graphitic carbon frameworks

Method used

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  • Preparation method and application of coated S-Fe/Co@C bimetallic catalyst derived from ZIF-67
  • Preparation method and application of coated S-Fe/Co@C bimetallic catalyst derived from ZIF-67
  • Preparation method and application of coated S-Fe/Co@C bimetallic catalyst derived from ZIF-67

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a method for preparing a ZIF-67-derived encapsulated S-Fe / Co@C bimetallic catalyst, which specifically includes the following steps:

[0027] Step 1, 1.45g ferric chloride hexahydrate and 100mg polyvinylpyrrolidone are dissolved in the three-necked flask that 60mL 70% ethanol solution is housed, then the mixture is heated under N 2 Stir at room temperature under atmosphere for 30 minutes. Among them, polyvinylpyrrolidone was used as a dispersant; subsequently, a fresh reducing solution prepared by dissolving 0.7 g of sodium borohydride and 2.35 g of sodium dithionite in 20 mL of deionized water was added dropwise into a three-necked flask. Put the mixture in N 2 Stirring was continued for 30 minutes. Finally, the black product was separated using a magnet, and the product was washed three times each with ethanol and deionized water to remove excess sodium borohydride and sodium dithionite. The final black solid was vacuum-dried overnight in a...

Embodiment 2

[0036] This example provides a method for degrading tetrabromobisphenol A in groundwater by activating PMS with a ZIF-67-derived encapsulated S-Fe / Co@C bimetallic catalyst, which specifically includes the following steps:

[0037] Step 1. The degradation experiment was carried out in a 100 ml serum bottle at room temperature. The bimetallic catalyst S-Fe / Co@C (0.2g L -1 ) into TBBPA solution (20mg·L -1 )middle. After 30 minutes, a certain volume of PMS (0.6mM·L -1 ) solution to start the reaction. At specified time intervals, collect 1mL solution samples during the experiment, and immediately add 1mL methanol to terminate the reaction, and detect the remaining concentration of tetrabromobisphenol A.

[0038] Such as image 3 Shown is the degradation effect diagram of the ZIF-67-derived encapsulated S-Fe / Co@C bimetallic catalyst activated by PMS to remove tetrabromobisphenol A in groundwater prepared by the present invention. The PMS system alone could only directly remov...

Embodiment 3

[0040] This embodiment provides a kind of ZIF-67 derived encapsulation type S-Fe / Co@C bimetallic catalyst activation PMS ion leaching rate in the process of degrading TBBPA, specifically comprises the following steps:

[0041] The solution after the reaction in Example 2 was taken, and the concentration of iron ions and cobalt ions leached in the solution was measured by inductively coupled plasma technology.

[0042] Figure 4For the leaching rate of cobalt ion and iron ion after the material degradation reaction of the present invention, it is found that the cobalt ion and iron ion of leaching are all far lower than the discharge limit value (cobalt ion: < 1.0mg / L and iron ion: <0.3 mg / L). It fully demonstrates that S-Fe / Co@C has a low ion leaching rate and has no secondary pollution to the environment.

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Abstract

The invention provides a preparation method and application of a coated S-Fe / Co@C bimetallic catalyst derived from a zeolite imidazate framework (ZIF-67). The catalyst is prepared by taking ZIF-67 and vulcanized nano zero-valent iron (S-Fe) as precursors and carbonizing in a nitrogen atmosphere. After carbonization, the catalyst can inherit the advantages of large specific surface area, many reaction active sites, strong pollutant enrichment capacity and the like of the ZIF-67 material, and can also prevent oxidation and agglomeration of the sulfurized nano zero-valent iron. The catalyst can be used for activating peroxymonosulfate (PMS) to efficiently degrade halogenated organic pollutants, the metal ion leaching rate is low, and secondary pollution to the environment is avoided. The catalyst is an environment functional material, can be used for degrading halogenated organic pollutants in underground water, is green and environment-friendly, and has an obvious remediation effect.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a preparation method and application of an encapsulated S-Fe / Co@C bimetallic catalyst derived from ZIF-67. Background technique [0002] Advanced oxidation based on peroxymonosulfate (PMS) activation has emerged as an alternative to traditional hydroxyl radical-induced methods due to its higher redox potential, longer half-life, and better oxidation selectivity. Although metal ions in the homogeneous phase can well activate PMS for oxidation, the leaching of metal ions during the reaction will lead to secondary pollution. Therefore, the use of heterogeneous catalysts is considered as a promising alternative. Metal-organic frameworks (MOFs) have attracted extensive attention in the field of advanced oxidations due to their highly ordered structures, large specific surface areas, and tunable structural features. The high density of lacking coordination metal cations is expected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C02F1/72C02F101/34
CPCB01J27/043C02F1/722C02F1/725C02F2101/345B01J35/396
Inventor 相明辉李辉陆振潘文学钱刘
Owner SHANGHAI UNIV
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