1. Hydrogen bond covalent organic aerogel material H_CA method for synthesizing OA-2, which is characterized in that: the method comprises the following steps:

the method comprises the following steps: dissolving benzene-1, 3, 5-triacyl hydrazine in an organic solvent dimethyl sulfoxide, keeping the concentration of the solution at 0.04mol/L, and naming the solution as A;

step two: dissolving 1, 5-naphthalene disulfonic acid in the solution A, keeping the concentration of the solution at 0.12mol/L and naming the solution B as the solution B;

step three: dissolving terephthalaldehyde in the solution B, keeping the concentration of the terephthalaldehyde at 0.06mol/L, and naming the terephthalaldehyde as the solution C;

the molar ratio of the solution C is as follows: benzene-1, 3, 5-trihydrazide: 1, 5-naphthalenedisulfonic acid: terephthalaldehyde ═ 2: 6: 3;

step four: placing the solution C in a constant-temperature oil bath pan, and heating and reacting at 100 ℃ for 30 minutes to obtain a yellow polymer;

step five: putting the yellow polymer obtained in the step four into a dialysis bag, taking distilled water as dialysate, removing the organic solvent, and taking out after obvious layering appears in the dialysis bag after 2-3 days to obtain an obtained product;

step six: pouring the obtained substance obtained in the fifth step into a beaker, freezing at low temperature, and then freeze-drying to obtain the hydrogen bond covalent organic aerogel material H_COA-2。

Background

Covalent Organic Polymers (COPs), an emerging porous covalent organic material, are linked by stable covalent bonds. It has received attention due to its characteristics of stable structure, high specific surface area, large porosity, modifiable structure and easy functionalization and is widely used in the fields of energy, medicine and environment. COPs are generally constructed by two types of monomers through one covalent bond, which severely limits the structural complexity and functional diversity, and the preparation of novel COPs with multifunctional structures is a problem to be solved urgently.

The invention prepares the three-component hydrogen bond covalent organic aerogel H by a simple solvothermal method_COA-2. The advantages are that: (1) introducing aromatic hydrocarbon with sulfonic acid group to synthesize H_COA-2 has active sites of hydrogen bond action while having the advantages of covalent bond, and the existence of the hydrogen bond is favorable for increasing H_CAdsorption performance of OA-2; (2) the dipole-dipole interaction caused by the polarization of oxygen and sulfur atoms allows the H produced_COA-2 has higher adsorption affinity; (3) the combined action of the hydrogen bond and the covalent bond breaks through the limitation of a single covalent bond, and provides more possibility for constructing COPs materials with multi-level sub-pore channels.

Disclosure of Invention

The invention aims to provide a hydrogen bondCovalent organic aerogel H_CA synthesis method of OA-2 comprises the following steps:

the method comprises the following steps: dissolving benzene-1, 3, 5-triacyl hydrazine in an organic solvent dimethyl sulfoxide, keeping the concentration of the solution at 0.04mol/L, and naming the solution as A;

step two: dissolving 1, 5-naphthalene disulfonic acid in the solution A, keeping the concentration of the solution at 0.12mol/L and naming the solution B as the solution B;

step three: dissolving terephthalaldehyde in the solution B, keeping the concentration of the terephthalaldehyde at 0.06mol/L, and naming the terephthalaldehyde as the solution C;

the molar ratio of the solution C is as follows: benzene-1, 3, 5-trihydrazide: 1, 5-naphthalenedisulfonic acid: terephthalaldehyde ═ 2: 6: 3;

step four: placing the solution C in a constant-temperature oil bath pan, and heating and reacting at 100 ℃ for 30 minutes to obtain a yellow polymer;

step five: putting the yellow polymer obtained in the step four into a dialysis bag, taking distilled water as dialysate, removing the organic solvent, and taking out after obvious layering appears in the dialysis bag after 2-3 days to obtain an obtained product;

step six: pouring the obtained substance obtained in the fifth step into a beaker, freezing at low temperature, and then freeze-drying to obtain the hydrogen bond covalent organic aerogel material H_COA-2。

The invention has the beneficial effects that:

the hydrogen bond covalent organic polymer material H obtained by the synthetic method of the invention_COA-2 has high chemical stability, simple synthesis method, multi-level pore channels, rich functional groups and shape plasticity.

Drawings

FIG. 1 is H of the present invention_CA schematic diagram of the synthesis of OA-2;

FIG. 2 is H synthesized according to the present invention_CA powder X-ray diffraction pattern of OA-2;

FIG. 3 is H synthesized according to the present invention_CScanning electron micrographs of OA-2;

FIG. 4 is H synthesized by the present invention_CFourier transform-infrared spectrogram of OA-2;

FIG. 5 is a synthesis of the present inventionH of (A) to (B)_CThermogravimetric curves of OA-2 under nitrogen atmosphere;

FIG. 6 is H synthesized by the present invention_CNitrogen desorption curve of OA-2;

FIG. 7 is H synthesized by the present invention_CX-ray photoelectron spectroscopy of OA-2.

Detailed Description

Synthesis of H_CThe starting materials used for OA-2 are all commercially available products.

As shown in figure 1, a hydrogen-bonded covalent organic polymer material H_CA method for synthesizing OA-2. The method comprises the following steps:

the method comprises the following steps: dissolving benzene-1, 3, 5-triacyl hydrazine in an organic solvent dimethyl sulfoxide, keeping the concentration of the solution at 0.04mol/L, and naming the solution as A;

step two: dissolving 1, 5-naphthalene disulfonic acid in the solution A, keeping the concentration of the solution at 0.12mol/L and naming the solution B as the solution B;

step three: dissolving terephthalaldehyde in the solution B, keeping the concentration of the terephthalaldehyde at 0.06mol/L, and naming the terephthalaldehyde as the solution C;

in this case, the molar ratio of the solution C is: benzene-1, 3, 5-trihydrazide: 1, 5-naphthalenedisulfonic acid: terephthalaldehyde ═ 2: 6: 3;

step four: placing the solution C in a constant-temperature oil bath pan, and heating and reacting at 100 ℃ for 30 minutes to obtain a yellow polymer;

step five: putting the yellow polymer obtained in the step four into a dialysis bag, taking distilled water as dialysate, removing the organic solvent, and taking out after obvious layering appears in the dialysis bag after 2-3 days to obtain an obtained product;

step six: pouring the obtained substance obtained in the fifth step into a beaker, freezing at low temperature, and then freeze-drying to obtain the hydrogen bond covalent organic aerogel material H_COA-2。

H synthesized by the invention_CThe powder X-ray diffraction pattern of OA-2 is shown in FIG. 2.

H synthesized by the invention_CA scanning electron micrograph of OA-2 is shown in FIG. 3.

H synthesized by the invention_CThe Fourier transform-infrared spectrum of OA-2 is shown in FIG. 4.

H synthesized by the invention_CThe thermogravimetric curve of OA-2 under a nitrogen atmosphere is shown in FIG. 5.

H synthesized by the invention_CThe nitrogen desorption curve of OA-2 is shown in FIG. 6.

H synthesized by the invention_CThe X-ray photoelectron spectroscopy analysis of OA-2 is shown in FIG. 7.