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Method for in-situ hydrothermal preparation of magnetic metal-organic framework core-shell material

A technology of magnetic metals and organic frameworks, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of cumbersome layer-by-layer self-assembly, and achieve simple synthesis methods and easy recycling Effect

Inactive Publication Date: 2017-08-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to aim at existing Fe 3 o 4 Fe 3 o 4 Functionalization, the addition of metal ion sources, cumbersome layer-by-layer self-assembly, etc., provide a method for the in-situ hydrothermal preparation of magnetic metal-organic framework core-shell materials with the advantages of simple synthesis and no need for additional metal ion sources.

Method used

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  • Method for in-situ hydrothermal preparation of magnetic metal-organic framework core-shell material
  • Method for in-situ hydrothermal preparation of magnetic metal-organic framework core-shell material
  • Method for in-situ hydrothermal preparation of magnetic metal-organic framework core-shell material

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Embodiment 1

[0031] Embodiment 1: the Fe prepared by the present invention is given below 3 o 4 Adsorption efficiency diagram of 7 organic dyes on @MIL-101(Fe) material. From Figure 8 It can be seen that the material has adsorption effect on 7 kinds of dyes, and the order of adsorption efficiency is: methylene blue>basic blue 6B>rhodamine B>acid chrome blue K>chrome black T>indigo>acid magenta, and the adsorption amount is between Between 42.0-221mg g -1 Between, this result shows that Fe 3 o 4 The @MIL-101(Fe) material can be used for the removal of dyes in water and can be used to improve water quality.

Embodiment 2

[0032] Embodiment 2: the Fe prepared by the present invention is given below 3 o 4 Adsorption behavior of methylene blue on @MIL-101(Fe) material. The adsorption behavior was studied by Langmuir and Freundlich two isotherm adsorption models. Fe at different temperatures 3 o 4 See Table 1 for the isothermal adsorption parameters of @MIL-101(Fe) to methylene blue. Table 1 shows that the Freundlich isothermal adsorption model is used to linearly fit its adsorption behavior, and the linear regression coefficient is only 0.895, while the Langmuir model fitted The linear regression coefficient reached 0.9976, indicating that its adsorption behavior conformed to the Langmuir isotherm adsorption model.

[0033] Table 1

[0034]

Embodiment 3

[0035] Embodiment 3: the Fe prepared by the present invention is given below 3 o 4 The change value of the adsorption efficiency of @MIL-101(Fe) material after several cycles. Figure 9 showed that after 4 cycles, Fe 3 o 4 The methylene blue adsorption efficiency of @MIL-101(Fe) material is still 154.7mg g -1 , keeping 70% of the original efficiency, which shows that it has good recycling efficiency.

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Abstract

The invention discloses a method for in-situ hydrothermal preparation of a magnetic metal-organic framework core-shell material, relating to preparation of core-shell materials. The invention provides a method for in-situ hydrothermal preparation of a magnetic metal-organic framework core-shell material with the advantages of being simple and convenient in synthesis and free of an additional metal ion source. The method comprises the steps of sequentially adding FeCl3.6H2O, anhydrous sodium acetate and ethylene glycol to a container, mixing evenly, transferring the mixture to a reaction kettle, carrying out heating reaction and cooling to a room temperature; washing an obtained black product by using ethanol and drying to obtain Fe3O4 microspheres; sequentially adding the obtained Fe3O4 microspheres, trimesic acid and water to the reaction kettle, mixing evenly, and carrying out heating reaction to obtain a brown solid sample; and cooling the sample to the room temperature and drying under a nitrogen condition, wherein the obtained sample is the magnetic metal-organic framework core-shell material, namely a Fe3O4@MIL-101(Fe) core-shell material.

Description

technical field [0001] The invention relates to the preparation of core-shell materials, in particular to a method for in-situ hydrothermal preparation of magnetic metal-organic framework core-shell materials. Background technique [0002] Metal-organic frameworks (Metal organic frameworks, MOFs) are a class of porous coordination polymers that use metal ions as connection points and organic ligands as supports to form a 3D extension structure in space, with adjustable pore size and modifiable channels. Surface, ultra-low density, ultra-high specific surface area and other advantages, have been used in hydrogen storage, CO 2 Capture, chemical separation, catalysis, drug delivery, biomedical imaging, and chemical sensors have been widely used. However, the application of metal-organic framework materials has problems such as separation and recovery difficulties, and operations such as centrifugation are usually required to achieve separation and recovery of materials. In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/32C02F1/28
CPCB01J20/06B01J20/223B01J20/28009B01J20/3214C02F1/288
Inventor 曾景斌李蒙蒙索比亚·阿斯兰姆薛懿桐段伟李宇龙种法运
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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