Foam material based on heteroporous covalent organic framework as well as preparation method and application thereof

A technology of covalent organic frameworks and foam materials, applied in chemical instruments and methods, inorganic chemistry, and other chemical processes, can solve the problems of slow adsorption speed and limited application, and achieve low cost, simple preparation method, and good practicability Effect

Pending Publication Date: 2021-02-05
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the adsorption method is considered to be a simple, efficient, and non-destructive method because of its low cost, simple operation, and universal applicability to organic pollutants. Many materials, including activated carbon, carbon nanotubes, metal-organic frameworks, zeolites, etc. materials have been used as adsorbents for dye removal, these adsorbents have their own advantages, but their adsorption speed is relatively slow, which limits their application in high-throughput sample analysis

Method used

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  • Foam material based on heteroporous covalent organic framework as well as preparation method and application thereof
  • Foam material based on heteroporous covalent organic framework as well as preparation method and application thereof
  • Foam material based on heteroporous covalent organic framework as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 83 mg benzidine and 951 mg p-toluenesulfonic acid were ground in a mortar for 2 min to mix homogeneously, then, 49 mg trimesaldehyde was added to the mixture and continuously ground for 2 min to obtain a homogeneous mixture; due to benzidine and p-toluenesulfonic acid The mixing and grinding of the benzidine molecule makes the amino group (-NH 3+ ) and the sulfonic acid group (-SO 3- ), leading to the formation of p-toluenesulfonate, and then, the addition of trimesaldehyde triggers the Schiff base condensation reaction with benzidine, which finally generates covalent organic frameworks (COFs); benzidine, p- The material ratio of toluenesulfonic acid and trimesaldehyde is 0.45:5:0.3mmol, because the material prepared with this ratio has better crystallinity and faster adsorption speed for triphenylmethane dyes. Subsequently, 0.2 mL of deionized water was added to the above mixture and ground again for 15 min to form a paste.

[0044] Next, add 500mg of sodium bicarbon...

Embodiment 2

[0048] In order to analyze various properties of the TbBd-foam prepared in Example 1, infrared spectroscopy (FT-IR), X-ray diffraction (XRD), nitrogen-adsorption-desorption and thermogravimetric analysis were performed on it in this example.

[0049] Figure 2a shows the infrared spectrum of TbBd-foam, 3448cm -1 and 3363cm -1 The adsorption band at is attributed to the N-H stretching mode, 1695cm -1 The peak at and 1485cm -1 The absorption bands at are respectively assigned to C=O stretching and aromatic C-C ring stretching, 1616cm -1 The stretching at is attributed to the C=N stretching mode, which shows that the TbBd foam was successfully prepared by the Schiff base condensation reaction.

[0050] Figure 2b The XRD pattern of TbBd-foam is shown, and the diffraction peak of TbBd-foam at 3.26° matches the (100) plane, indicating that the product is well crystallized.

[0051] Figure 2c The nitrogen-adsorption-desorption isotherm diagram of TbBd-foam is shown, and TbBd...

Embodiment 3

[0055] In order to study the adsorption properties of the TbBd-foam prepared in Example 1, the following adsorption experiments were done in this example.

[0056] Experiment 1: Disperse 4.0 mg of TbBd-foam prepared in Example 1 in 4 mL of malachite green or crystal violet solution (first dissolve triphenylmethane dyes, malachite green and crystal violet with acetonitrile, and prepare 1 mg / mL stock solution, and then dilute the stock solution with deionized water to obtain triphenylmethane dyes (malachite green and crystal violet solutions) with a concentration of 2-100mg / L), and adsorb with the assistance of a vortex, and adsorb at 25°C for 30min. Then, centrifuge the two phases, and measure the concentration of free malachite green and crystal violet in the solution with a UV-visible spectrophotometer (the maximum ultraviolet absorption wavelengths of malachite green and crystal violet are 617nm and 590nm respectively).

[0057] Adsorption capacity q e (mg / g) is calculated ...

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a foam material based on a heteroporous covalent organic framework as well as a preparation method andapplication of the foam material. According to the invention, benzidine, p-toluenesulfonic acid and benzenetricarboxaldehyde are mixed and ground according to a certain ratio, and sodium bicarbonateand a small amount of deionized water are added in batches for grinding to help raw materials expand so as to form nonuniform gaps; and then through freezing, drying, heating and other methods, moisture is removed and redundant carbon dioxide released in reaction is released until the foam material based on the heteroporous covalent organic framework is generated through crystallization. Due to the porosity of the material, triphenylmethane dyes (malachite green and crystal violet) can be quickly, efficiently and massively captured and adsorbed, the material has very high thermal stability andreusability, and the practicability of the material is reflected in that the material can be applied to the field of sewage treatment and particularly can be massively applied to adsorption of the triphenylmethane dyes.

Description

technical field [0001] The invention belongs to the technical field of chemical material preparation, and in particular relates to a foam material based on a heteroporous covalent organic framework, a preparation method and application thereof. Background technique [0002] With the development of social industrialization, environmental pollution is increasing day by day. Organic dyes, as a class of important chemical pollutants, are inevitably released into the natural ecosystem during the process of synthesis and use, causing environmental water pollution and causing people's great concern. As typical representatives, triphenylmethane dyes are widely used in various industries such as textiles, leather, plastics, rubber, food, medicine, and cosmetics. These dyes are potentially carcinogenic and mutagenic, and pose a serious threat to aquatic organisms and even humans. At the same time, since triphenylmethane dyes are highly soluble in water and difficult to degrade at hig...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/226B01J20/28054C02F1/285C02F2101/308Y02C20/40
Inventor 李国梁刘继超于延新张现龙吴永宁
Owner SHAANXI UNIV OF SCI & TECH
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