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Irreversible covalent organic framework for efficiently and selectively recovering gold and preparation method

A technology of covalent organic frameworks and compounds, applied in the field of precious metal recovery in aqueous solution, can solve the problems of irreversible covalent organic frameworks that cannot be directly synthesized, poor chemical stability, slow adsorption rate, etc., and achieves fast adsorption kinetics, high selectivity, high The effect of high crystallinity and stability

Active Publication Date: 2019-12-24
JIANGNAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention aims at the disadvantages of slow adsorption rate, poor chemical stability and low adsorption capacity of existing gold adsorbents, and provides a fast and highly selective recovery of amide covalent organic framework and its preparation method. The imine bond in the valent organic framework was replaced by an amide bond to obtain a covalent organic framework with high crystallinity and stability irreversible amide bond. The introduced amide bond endowed the prepared covalent organic framework with fast and highly selective adsorption of gold in aqueous solution. Ability to selectively recover precious metal gold in aqueous solution
The present invention not only provides a highly stable irreversible covalent organic framework and its preparation method, solves the problem that the irreversible covalent organic framework cannot be directly synthesized, but also provides a new solution for the efficient recovery of gold resources

Method used

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  • Irreversible covalent organic framework for efficiently and selectively recovering gold and preparation method
  • Irreversible covalent organic framework for efficiently and selectively recovering gold and preparation method
  • Irreversible covalent organic framework for efficiently and selectively recovering gold and preparation method

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Embodiment 1

[0044]Preparation of an amide covalent organic framework with high efficiency and selective recovery of gold: A highly stable and crystallinity amide covalent organic framework was prepared by monomer exchange method, which realized the efficient and selective recovery of gold in aqueous solution, including Follow the steps below:

[0045] 1) 36.4mg 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (Tz), 34.5mg 4,4'-biphenyldicarbaldehyde (BA), 3.5mg tris Scandium fluoromethanesulfonate was dissolved in a mixed solvent of dioxane and mesitylene (2:1, 3mL) respectively to obtain a uniform mixed solution by ultrasonication, and the above reaction solution was reacted at 60°C for 1 day;

[0046] 2) After the reaction tube was cooled to room temperature, 30.5 mg of terephthaloyl chloride was added and reacted at 4°C for 2 days after ultrasonication for 10 minutes. The obtained red solid was washed three times with 10 mL of tetrahydrofuran, extracted with acetone, and finally vacuum-dried t...

Embodiment 2

[0053] Preparation of an amide covalent organic framework for efficient and selective recovery of gold: the steps and method are basically the same as in Example 1, except that the 4,4'-biphenyldicarbaldehyde in step 1 is replaced by terephthalaldehyde, With other conditions unchanged, the characterization results of the obtained covalent organic framework were similar to those in Example 1, and the yield of the obtained covalent organic framework with amide bonds was 84.4%.

Embodiment 3

[0055] Preparation of an amide covalent organic framework for efficient and selective recovery of gold: the steps and methods are basically the same as in Example 1, except that 2,4,6-tris(4-aminophenyl)-1 in step 1 , 3,5-triazine was replaced by p-1,3,5-tri(4-aminophenyl)benzene, the obtained covalent organic framework characterization results were similar to those in Example 1, and the resulting amide bond covalent organic framework produced The rate is 81.8%.

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Abstract

The invention discloses an irreversible covalent organic framework for efficiently and selectively recovering gold and a preparation method, and belongs to the technical field of recovery of preciousmetals in aqueous solutions. According to the preparation method, trifluoromethanesulfonic acid metal salt is used as a catalyst, a parent covalent organic framework is prepared by adopting a solvothermal method, and then an exchange reaction is carried out by using a corresponding structural unit, so that the irreversible amide covalent organic framework material is prepared. According to the preparation method, the preparation problem of the high-stability irreversible covalent organic framework is solved; and the introduced amido bond endows the covalent organic framework with the capability of quickly and highly selectively recovering precious metal gold in an aqueous solution, and the covalent organic framework can be repeatedly used, so that the application of the covalent organic framework as an efficient adsorbent in the field of adsorption separation is expanded, and a novel material is provided for efficiently recovering or removing metal salts of acids.

Description

technical field [0001] The invention specifically relates to a non-reversible covalent organic framework for efficiently and selectively recovering gold and a preparation method thereof, belonging to the technical field of precious metal recovery in aqueous solution Background technique [0002] In addition to being one of the most common jewelry, gold also has a wide range of applications in our daily life in fields such as electronics, medicine and catalysis. The extensive use of gold not only leads to a large amount of energy consumption of this precious metal, but also poses a great threat to the ecological environment. Therefore, recovery of gold from secondary resources such as discarded electronic equipment is of great importance from both economic and environmental perspectives. Currently, there are many techniques for recovering gold from aqueous solutions, such as adsorption, precipitation, solvent extraction, and ion exchange. Adsorption methods using porous mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C08G83/00C22B7/00C22B11/00C02F101/20
CPCB01J20/22B01J2220/4812C02F1/285C02F2101/20C08G83/008C22B7/005C22B11/00Y02P10/20
Inventor 钱海龙孟范琳严秀平
Owner JIANGNAN UNIV
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