Cadmium-based metal-organic framework material as well as preparation method and application thereof

An organic framework, metal-based technology, applied in the field of advanced porous and luminescent materials, can solve the problems of MOF materials such as microscopic reaction process, topology and performance are difficult to predict, poor thermal stability and water stability.

Active Publication Date: 2020-06-09
CHONGQING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the open MOF materials that have been reported so far have poor thermal and water stability, and it is difficult to predict the microscopic reaction process, topology and performance of MOF materials.

Method used

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  • Cadmium-based metal-organic framework material as well as preparation method and application thereof
  • Cadmium-based metal-organic framework material as well as preparation method and application thereof
  • Cadmium-based metal-organic framework material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take the material according to the following specific mass or volume: H 4 etc(17.3mg, 0.05mmol), tpt(15.5mg, 0.05mmol), Cd(NO 3 ) 2 4H 2 O (30.8 mg, 0.1 mmol), CH 3 CN (3mL), H 2 O (7 mL). Put the above material in 25mL polytetrafluoroethylene liner, stir for about 0.5h, seal it in a stainless steel reaction kettle, place the reaction kettle in an electric blast oven and raise the temperature to 140°C, after 4 days of reaction, cool naturally to room temperature, A bulk crystal sample was obtained, which was filtered from the mother liquor, washed with distilled water, and dried naturally in air at room temperature.

[0032] To the prepared crystal sample, carry out powder diffraction test with Shimadzu XRD-6100 type X-ray diffractometer (see figure 1, abscissa—angle; ordinate—diffraction intensity), the peaks of the test spectrum and the peaks of the crystal structure simulation spectrum (software Mercury) can be well matched, indicating that the structure of the...

Embodiment 2

[0049] Take the material according to the following specific mass or volume: H 4 etc(17.3mg, 0.05mmol), tpt(15.6mg, 0.05mmol), Cd(NO 3 ) 2 4H 2 O (30.8 mg, 0.1 mmol), CH 3 CN (3mL), H 2 O (7mL), HNO 3 solution (30uL, 7mol / L, 0.21mmol). Put the above material in 25mL polytetrafluoroethylene lining, stir for about 0.5h, seal it in a stainless steel reaction kettle, place the reaction kettle in an electric blast oven and raise the temperature to 160°C, react for 5 days, and cool it down to room temperature naturally. A bulk crystal sample was obtained, which was filtered from the mother liquor, washed with distilled water, and dried naturally in air at room temperature.

[0050] The product was characterized by powder X-ray diffraction, and the data obtained were similar to those in Example 1. It shows that the crystal structure prepared by Example 2 does not change, and the product has a higher purity.

[0051] This embodiment is repeated several times, and actually obta...

Embodiment 3

[0053] Take the material according to the following specific mass or volume: H 4 etc(17.3mg, 0.05mmol), tpt(15.6mg, 0.05mmol), Cd(NO 3 ) 2 4H 2 O (30.8 mg, 0.1 mmol), CH 3 CN (3mL), H 2 O (7 mL). Put the above material in 25mL polytetrafluoroethylene liner, stir for about 0.5h, seal it in a stainless steel reaction kettle, place the reaction kettle in an electric blast oven and raise the temperature to 150°C, react for 6 days, and cool it down to room temperature naturally. A bulk crystal sample was obtained, which was filtered from the mother liquor, washed with distilled water, and dried naturally in air at room temperature.

[0054] The product was characterized by powder X-ray diffraction, and the data obtained were similar to those in Example 1. It shows that the crystal structure prepared by Example 2 does not change, and the product has a higher purity.

[0055] This embodiment is repeated many times, Cd 2 - The quality of MOF is maintained at 17.2-21.3 mg, and ...

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Abstract

The invention provides a cadmium-based metal-organic framework material. The chemical general formula of the material is {[Cd2 (etc) (tpt) 4/3] (H2O) 9} n, the material belongs to a trigonal system, the space group is P-3c, and the cell parameters are as follows: a=27.3972(7) angstroms, b=27.3972(7) angstroms, c=37.081 angstroms, and V=24104(2) angstrom<3>. In the chemical general formula, a component etc<4-> is obtained by removing four protons from semi-rigid quaternary organic carboxylic acid H4etc, the structure of the H4etc is shown as a formula I, and the structure of a component tpt isshown as a formula II. The preparation conditions of the cadmium-based metal-organic framework material are mild, and the yield can reach 56%. The framework material has good water stability, has thermal stability close to 400 DEG C, emits blue fluorescence at 473nm at room temperature, has a specific surface area BET value of 624.43m<2>/g and an N2 adsorption value of 165.27cm<3> (STP)/g at 77K temperature, and can be used for storage and preliminary identification of aluminum ions and heavy metal barium ions.

Description

technical field [0001] The invention belongs to the field of advanced porous and luminescent materials, and specifically relates to a cadmium-based metal-organic framework material and its preparation method and application. Background technique [0002] Porous material is a material with a network structure composed of interconnected or closed pores, which are commonly found in nature such as wood, cork, sponge and coral, etc.; according to whether the pores are connected, they can be divided into open pores ( Or called open), semi-open and closed cells and other types. From the perspective of sustainable development, open-pore materials are favored by humans. Restricted by natural resources, artificial synthesis has been an important source of porous materials since the middle of the 20th century. Modern technology can prepare metal, ceramic, glass, and supramolecular porous materials, and these materials are gradually being used in storage, insulation, buffering, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C09K11/06G01N21/31G01N21/64
CPCC08G83/008C09K11/06C09K2211/1425C09K2211/1466C09K2211/188G01N21/314G01N21/6428
Inventor 黄坤林吴越陈新郭媛媛张如意夏刚
Owner CHONGQING NORMAL UNIVERSITY
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