Microwave synthesis method for changing morphology of MIL-53-Fe by polymer

A mil-53-fe, microwave synthesis technology, applied in the field of iron-based MOFs preparation, can solve the problem of unreported

Active Publication Date: 2018-06-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to optimize the morphology of MIL-53-Fe, the common operation is to add surfactants such as polyvinylpyrrolido

Method used

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  • Microwave synthesis method for changing morphology of MIL-53-Fe by polymer
  • Microwave synthesis method for changing morphology of MIL-53-Fe by polymer
  • Microwave synthesis method for changing morphology of MIL-53-Fe by polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1gH 2 BDC (0.006mol) and 1.63gFeCl 3 ·6H 2 O (0.006mol) was dissolved in 50ml of DMF solution respectively, and magnetically stirred for 10min to fully dissolve it. H 2 BDC solution with FeCl 3 ·6H 2 The O solution was mixed, and 100 mg of poly-m-phenylenediamine was added at the same time, and magnetic stirring was continued for 0.5 h. After the dispersion was uniform, it was transferred into a microwave flask. Put the microwave flask containing the reaction solution in the microwave reactor, set the reaction parameters of the microwave reactor to 150°C, 500W, 0.5h, adjust the condensed water, and start the synthesis reaction. After the reaction, the sample was washed and purified by alternating centrifugation with ethanol and water until the centrifuged supernatant became colorless, and the centrifuged product was dried in an oven at 60°C for 12 hours to constant weight to obtain brown yellow MIL-53-Fe powder. SEM figure 1 It can be seen that the changed ...

Embodiment 2

[0029] According to the method of Example 1, the added polymer was changed to 100 mg polypyrrole, and brown MIL-53-Fe powder was prepared. SEM figure 2 It can be seen that compared with Example 1, the size of the obtained product MIL-53-Fe has changed, and it is a rectangular pyramid with a radius of about 1.1um and a length of about 3.9um.

Embodiment 3

[0031] According to the method of Example 1, the added polymer was changed to 100 mg polyaniline, and dark brown MIL-53-Fe powder was prepared. SEM image 3 It can be seen that MIL-53-Fe is still in the shape of a rectangular pyramid with a slight change in size, with a radius of about 0.9um and a length of about 4.6um.

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Abstract

The invention discloses a microwave synthesis method for changing a morphology of MIL-53-Fe by a polymer; with 1,4-terephthalic acid (H2BDC) and a trivalent iron salt as raw materials, and N,N-dimethyl formamide (DMF) as a reaction solvent, the polymer is added, microwave reaction conditions are controlled, MIL-53-Fe can be quickly synthesized and obtained, and the regular octahedron morphology ofthe MIL-53-Fe is transformed into rectangular-like cones having better material grafting, attachment and edge effects and small size advantages.

Description

technical field [0001] The invention belongs to the technical field of iron-based MOFs preparation, and in particular relates to a microwave synthesis method for polymers to change the morphology of MIL-53-Fe. Background technique [0002] As a new class of materials, metal-organic frameworks (MOFs) have attracted much attention and research recently because of their diversity, structural design and controllability, functional diversity, and high specific surface area and pore volume. Among them, iron-based MOFs are a cheap, easy-to-obtain and green branch, mainly including MIL-101-Fe, MIL-100-Fe, MIL-88-Fe and MIL-53-Fe. MIL-53-Fe has a special structural feature that can produce a reversible "breathing effect", that is, changes in the conditions of the material will cause reversible changes in the skeleton structure, so that the original octahedral single crystal can be transformed into Concave regular octahedron, spheroid, rectangular pyramid and other shapes. Compared ...

Claims

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Application Information

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IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 王海鹰汪鹏柴立元黄磊杨卫春唐崇俭杨志辉史美清王升李青竹
Owner CENT SOUTH UNIV
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