MOF (metal-organic framework) material with 3D-DNA network topological structure and synthesis and application thereof

A network topology and 3D-DNA technology, applied in cation exchange, water/sludge/sewage treatment, ion exchange, etc., can solve the problems of difficult operation, complex detection, low sensitivity, etc., and achieve simple process and mild conditions , will not cause the effect of secondary pollution

Active Publication Date: 2018-08-14
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional anion detection methods often include ion chromatography, chemical titration, and ion-selective electrodes, etc. The methods for removing anions usually include physical adsorption and photocatalytic reduction, etc. However, these methods require the use of large instruments, and there are complex detection and low sensitivity. , difficult operation and high cost

Method used

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  • MOF (metal-organic framework) material with 3D-DNA network topological structure and synthesis and application thereof
  • MOF (metal-organic framework) material with 3D-DNA network topological structure and synthesis and application thereof
  • MOF (metal-organic framework) material with 3D-DNA network topological structure and synthesis and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The synthesis route for the synthesis of 3D-DNA-MOF' in this example is as follows:

[0054] 1. Ligand H 2 Preparation of L

[0055]

[0056] Weigh 30-50mmol of 2,3-diaminobenzoic acid and place it in a 250ml round-bottomed flask, add 100-200mL of DMF solvent, mix well at room temperature, then add 50-70mmol of 4-pyridinecarbaldehyde dropwise, 80 It was heated at ℃ and condensed to reflux. After 5 days, it was naturally cooled to room temperature. A large amount of light gray precipitate was formed. The filter cake was filtered with suction, washed with distilled water, and dried to obtain about 8.6 g of crude product a.

[0057] Dissolve the crude product a in 900 mL of methanol and water in a mixed solution with a volume of 2:1, heat and stir to make it fully dissolved, and then quickly separate the solid-liquid phase through a vacuum suction filtration device, transfer the tan filtrate to a 1L beaker, The crystals were cultivated by the normal temperature solven...

Embodiment 2

[0067] Color response and characterization of 3D-DNA-MOF' to different anions.

[0068] Weigh 3 portions of 20 mg crystalline 3D-DNA-MOF′, soak them in 20 mL of 0.01 mol / L inorganic anion (N 3－ , SCN － , ClO 4 － ) in aqueous solution, the color of the crystals will get different responses. The ion-exchanged sample was filtered, washed and dried to give compound N 3 － @3D-DNA-MOF', SCN － @3D-DNA-MOF′, ClO 4 － @3D-DNA-MOF′, its response time is N 3 － >SCN － >ClO 4 － . We have done UV-vis, FT-IR, PXRD, AAS, XPS, SEM and ion chromatography tests on the above three compounds.

[0069] The conclusion of Example 2 is: relative to the 3D-DNA-MOF' material, the obtained compound N after ion exchange 3 － @3D-DNA-MOF', SCN － @3D-DNA-MOF′, ClO 4 － The colors of @3D-DNA-MOF′ become dark gray, dark gray and dark green respectively. Figure 11 The FT-IR spectrum shows that 3D-DNA-MOF' is at 1384cm -1 NO at 3 － The infrared characteristic peaks basically disappeared, an...

Embodiment 3

[0072] 3D-DNA-MOF' research on the selective exchange of different anions, the schematic diagram is as follows Figure 22 shown.

[0073] Use a pipette to measure 20 mL of inorganic salts (N 3 － / SCN － , N 3 － / ClO 4 － , SCN － / ClO 4 － , N 3 － / SCN － / ClO 4 － ) aqueous solution was placed in a sample bottle, 20 mg of crystals were added and filtered after soaking for 12 hours, washed with ultrapure water, and dried. Figure 15 The PXRD spectrum of the 3D-DNA-MOF' can still maintain the stability of its framework in the mixed inorganic salt solution of different components. where in N 3 － / SCN － , N 3 － / ClO 4 － and N 3 － / SCN － / ClO 4 － Among the components, the solid color changes from green to dark gray, and the component is SCN － / ClO 4 － In the inorganic salts, it turns dark gray. FT-IR spectrogram analysis, respectively soaked in the component N 3 － / SCN － , N 3 － / ClO 4 － and N 3 － / SCN － / ClO 4 － In the mixed anion solution, th...

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Abstract

The invention relates to an MOF material with the 3D-DNA network topological structure. The chemical formula is {[Cu2(HL)2NO3].NO3)n, n is a non-zero natural number, the MOF material belongs to a cubic crystal system and a (for the details of the formula, please refer to the original text) space group, is provided with 3D pore channels, meanwhile, presents a 3D-DNA double helix network topologicalstructure, and has the good thermal stability and chemical stability. The synthesis process of the material comprises the steps that ligand of H2L, a CuI acetunitrile solution, acetunitrile, HNO3, H2O are placed in a hard glass tube at the certain proportion to be sealed, and then ultrasonic treatment is conducted; a solvothermal reaction is conducted, the product is maintained for 8-16 hours atthe constant temperature of 100-140 DEG C, then the product is cooled to be at the room temperature at the speed of 3-5 DEG C / h, and vacuum excitation is conducted for 12 hours at the temperature of 100-120 DEG C. The MOF material with the 3D-DNA network topological structure can specifically bind toxic negative ions (N3-, SCN-, ClO4- and the like) in a water system, and thus the purpose of purifying the water system is achieved. Meanwhile, the MOF material is capable of rapidly identifying and efficiently removing N3-, the removing rate of N3- can reach 99% or above in a short period, and nosecondary pollution is caused.

Description

technical field [0001] The invention relates to the field of metal-organic frameworks, in particular to a MOF material with a 3D-DNA network topology and its application in specifically binding toxic anions in water. Background technique [0002] In recent years, with the continuous development of modern industry, water pollution has become increasingly serious. It will not only lead to deterioration of water quality, but also seriously endanger the safety of crops and human health. In industrially developed cities, the wanton discharge of industrial wastewater is the chief culprit of water pollution, especially the existence of some toxic ion pollutants, which has caused great harm to aquaculture, agriculture and organisms. Therefore, how to separate and remove the polluting ions in industrial wastewater is of great significance for purifying water resources, improving the quality of life and protecting the environment. In biochemistry, DNA / RNA fragments are combined with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01J39/16C02F1/42
CPCB01J39/16C02F1/42C02F2001/425C08G83/008
Inventor 黄晓春叶春荣李冕
Owner SHANTOU UNIV
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