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Cd MOF (metal-organic framework) material and preparation method thereof

An organic framework, cadmium metal technology, applied in the direction of organic chemistry methods, cadmium organic compounds, 2/12 group organic compounds without C-metal bonds, etc., can solve the problem of losing high specific surface area and structural integrity, and unstable MOFs materials , easily attacked by water molecules, etc., to achieve good selective adsorption, easy to obtain, and mild reaction conditions

Inactive Publication Date: 2017-10-24
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some reports have shown that many MOFs are unstable and rapidly lose their high specific surface area and structural integrity when soaked in water.
This is because the relatively weak metal-hydrogen bonds within the structure are vulnerable to attack by water molecules leading to loss of structural integrity
Because water is ubiquitous, this shortcoming seriously hinders the application of MOFs to CO 2 adsorption

Method used

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Examples

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Effect test

Embodiment 1

[0030] Example 1: Preparation of cadmium metal organic framework material according to the present invention

[0031] 1. Preparation of cadmium metal organic framework materials with selective adsorption of carbon dioxide gas and stable water resistance:

[0032] (1) Prepare hot alkaline water with pH=7-8, measure 10mL

[0033] (2) Weigh 0.3mmol H 2 oba (4,4'-oxybibenzoic acid) and 0.15 mmol dmbpy (3,3'-dimethyl-4,4'-bipyridine) were added to the above solution together;

[0034] (3) Weigh 0.3mmol Cd(NO 3 ) 2 4H 2 O, add ethanol 5mL again, add in the above-mentioned solution together;

[0035] (4) Add the substance in step 3 into a 23mL polytetrafluoroethylene reactor, and keep it at 130°C for 72 hours under autogenous pressure. -1 Cool down to room temperature;

[0036] (5) the product that step 4 is obtained is filtered, after collecting crystal and drying, obtain colorless crystal (according to H 2 Oba calculates its yield: 48%).

[0037] 2. Characterization of cad...

Embodiment 2

[0049] Example 2: Research on thermal stability and chemical stability of cadmium metal organic framework material according to the present invention

[0050] The cadmium metal-organic framework material prepared in Example 1 was used to conduct research on thermal stability and chemical stability, and the specific methods are as follows:

[0051] 1. Research on the thermal stability of cadmium metal-organic framework materials that selectively adsorb carbon dioxide and are stable against water:

[0052] Weigh 3mg of the prepared cadmium metal organic framework material and the activated cadmium metal organic framework material respectively, and measure their thermal stability in the range of 25-800°C at a heating rate of 10°C / min.

[0053] The result is as Figure 5 Shown: when the cadmium metal organic framework material is at about 200 ℃, it loses 2 free ethanol molecules and 4 lattice water molecules in the coordination environment, and the mass loss is about 14.86%; at 2...

Embodiment 3

[0060] Example 3: Research on Selective Gas Adsorption of Cadmium Metal Organic Framework Materials According to the Present Invention

[0061] The cadmium metal-organic framework material obtained in Example 1 was used to carry out the research on gas selective adsorption, and the specific method is as follows:

[0062] The activated cadmium metal-organic frameworks have been studied on CO at 298K 2 ,CH 4 ,CO,O 2 ,N 2 and H 2 adsorption properties.

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Abstract

The invention relates to a Cd MOF (metal-organic framework) material capable of selectively adsorbing carbon dioxide gas and stable in water resistance. A chemical formula of the material is as follows: [Cd2(oba)2(dmbpy)(H2O)].2(EtOH).4(H2O), wherein oba represents 4,4'-oxy-biphenyldicarboxy, dmbpy represents 3,3'-dimethyl-4,4'-dipyridyl, and EtOH represents ethyl alcohol. 4,4'-oxy-biphenyldicarboxy and 3,3'-dimethyl-4,4'-dipyridyl are selected to synthesize a 3D MOF material with one-dimensional pores together with Cd under the hydrothermal condition. The Cd MOF material is stable in structure, and has strong water resistance, broad application prospect in the field of adsorptive separation of chemistry and chemical industry as well as the characteristics of being high in selectivity, high in adsorption capacity and resistant to water.

Description

technical field [0001] The invention belongs to the field of chemical and chemical adsorption separation, and relates to a cadmium metal organic framework material and a preparation method thereof. Background technique [0002] Metal-organic frameworks (MOFs) are zeolite-like (organic zeolite analogues) materials with a supramolecular microporous network structure formed by self-assembly of metal-ligand complexes between organic ligands and metal ions. It has the advantages of high specific surface area and pore volume, convenient synthesis, variable skeleton size, chemical modification according to the target requirements, and rich structure. It has attracted widespread attention in the fields of gas adsorption, catalysis, detection, and optoelectronic materials. [0003] CO produced by human production activities 2 is increasing rapidly, and has now become a hot spot. Therefore, from the perspective of environmental protection and sustainable development, it is urgent to...

Claims

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Application Information

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IPC IPC(8): C07F3/08B01D53/02B01J20/22
CPCB01D53/02B01D2257/504B01J20/226C07B2200/13C07F3/003Y02C20/40Y02P20/151
Inventor 马德运梁凤兰廖威林郭海福覃亮
Owner ZHAOQING UNIV
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