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Heavy metal adsorbent as well as preparation method and application thereof

An adsorbent and heavy metal technology, applied in the field of heavy metal adsorbent and its preparation, can solve the problem of small proportion of functional groups and the like

Active Publication Date: 2021-08-20
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although COF has shown strong adsorption capacity for some gases, dyes and metal ions, because its rigid skeleton usually accounts for a large proportion of the overall material, and the proportion of functional groups that realize functionality is relatively small, the adsorption capacity and adsorption capacity are relatively small. There is a certain bottleneck in efficiency

Method used

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  • Heavy metal adsorbent as well as preparation method and application thereof
  • Heavy metal adsorbent as well as preparation method and application thereof
  • Heavy metal adsorbent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0041] The preparation method of described heavy metal adsorbent comprises the following steps:

[0042] S12, providing a first monomer and a second monomer, and copolymerizing the first monomer and the second monomer to obtain a covalent organic framework polymer, wherein the first monomer or the second The di-monomer contains at least one cross-linkable carbon-carbon double bond;

[0043] S14, a third monomer is provided, and a cross-linking reaction occurs with the covalent organic framework polymer, and polymer molecular chains are grafted on the covalent organic framework polymer, and the third monomer has at least one cross-linkable linked carbon-carbon double bond and at least one reactive group; and

[0044] S16, providing a modifier, and reacting with the polymer molecular chain to obtain a covalent organic framework material, wherein the modifier is a compound containing a functional group that can adsorb heavy metals, and all the compounds in the third monomer The...

Embodiment 1

[0073] Embodiment 1 Preparation of COF-V-PAO containing amidoxime group

[0074]

[0075] (1) Construction of vinyl-containing covalent organic frameworks

[0076] Weigh 22.3 mg of 1,4-dialdehyde-2,5-divinylbenzene and 28.0 mg of 1,3,5-tris(4-aminophenyl)benzene into a miniature pressure-resistant reactor, and then add 0.5 mL of n-butanol and 0.5 mL of 1,2-dichlorobenzene, the mixed cloudy solution was ultrasonicated until uniformly mixed, and then 0.1 mL of acetic acid solution with a concentration of 6 mol / L was added as a catalyst.

[0077] Place the miniature pressure-resistant reactor in liquid nitrogen to cool until it solidifies, then vacuumize the reactor and backfill it with argon. The above process of cooling-vacuumizing-backfilling with argon is repeated three times, and then the reaction system is sealed. After the mixed solution inside the glass tube reached room temperature, it was placed in an oven at 100 °C for 72 h.

[0078] After the reaction was complet...

Embodiment 2

[0084] Preparation of COF-V-PAO-0.5 grafted with shorter polymer molecular chains in Example 2

[0085] The preparation method of Example 2 is basically the same as that of Example 1, except that less acrylonitrile monomer is added in step (2), that is, the addition of 3.72 mL of acrylonitrile in step (2) in Example 1 is replaced by adding 1.86 mL of acrylonitrile was used to obtain the covalent organic framework adsorbent COF-V-PAO-0.5, and the degree of polymerization of the polymer molecular chain grafted on COF-V-PAN-0.5 was 62. Nitrogen adsorption and desorption experiments show that the specific surface area of ​​COF-V-PAO-0.5 is 761 m 2 / g.

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Abstract

The invention relates to a heavy metal adsorbent, which comprises a covalent organic framework matrix and a polymer molecular chain grafted on the covalent organic framework matrix, and the polymer molecular chain contains a functional group capable of adsorbing heavy metal; the covalent organic framework matrix is obtained through copolymerization of a first monomer and a second monomer, and the first monomer and the second monomer are connected through condensation of an aldehyde group and an amino group; and the covalent organic framework matrix comprises a plurality of orderly arranged repeated pore structure units, each pore structure unit contains 3-96 polymer molecular chains, a chain link of each polymer molecular chain contains a modification group, and the polymerization degree of the polymer molecular chains is 2-150. The invention also relates to a preparation method and application of the heavy metal adsorbent.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a heavy metal adsorbent and its preparation method and application. Background technique [0002] Targeted recovery of valuable heavy metal ions in industrial wastewater is beneficial to the sustainable development of the environment and industry. Therefore, developing an efficient adsorption material for separating, removing and recovering high-value heavy metal ions has become one of the most urgent tasks in today's society. [0003] Covalent Organic Frameworks (COF) materials are formed by covalently connecting organic repeating units with rigid symmetrical structures, and are ordered two-dimensional or three-dimensional framework materials with open porous structures. Under normal conditions, covalent bonds are irreversible. Once formed, the connection mode of adjacent repeating units is determined, making it difficult to form an ordered crystalline structure. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/226C02F1/285C02F2101/20
Inventor 郁博轩闫灏党小飞李佳惠李炯利王旭东罗圭纳王刚
Owner 北京石墨烯技术研究院有限公司
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