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Non-reversible thioureaconnected covalent organic framework for rapidly removing mercury and preparation method and application thereof

A technology of covalent organic framework and thiourea, which is applied in chemical instruments and methods, other chemical processes, ion exchange, etc., can solve the problems of skeleton structure destruction and adverse effects of skeleton structure, etc.

Active Publication Date: 2021-09-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that common COFs functionalization methods have adverse effects on the skeleton structure, the present invention proposes a COFs functionalization strategy that combines functional groups and linkage bonds into one
The present invention not only provides a COFs functionalization strategy that combines functional groups and linkages into one, solves the problem of post-modification resulting in the destruction of the skeleton structure, and greatly improves the performance of functionalized COFs in applications. And it provides a new solution for the efficient removal of heavy metal mercury in aqueous solution

Method used

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  • Non-reversible thioureaconnected covalent organic framework for rapidly removing mercury and preparation method and application thereof
  • Non-reversible thioureaconnected covalent organic framework for rapidly removing mercury and preparation method and application thereof
  • Non-reversible thioureaconnected covalent organic framework for rapidly removing mercury and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of a covalent organic skeleton of high-efficiency high selective adsorbent mercury: a covalent organic skeleton JNU-3 prepared by a solvent heat method was prepared, and mercury in an aqueous solution was achieved. Efficient and high selective adsorption. Includes the following steps:

[0030] (1) 1,3,5-trimethylphenylene phenol (TP) (21.0 mg, 0.1 mmol), 1,1 '- (1,4-phenyl) double thiourea (PA-S) (33.9) Mg, 0.15 mmol), N, N-dimethylacetamide DMAC (0.8 mL) and mixtures of o-dichlorobenzene (0.2 mL) were ultra-mixed in 35 ml of Swings tube (OD 26 × L 125mm). liquid. Then, 12 mol / L, glacial acetic acid (0.1 mL) was added, further ultrasound for 5 minutes to perform freeze pump - thaw-degassing cycle. The test tube was then sealed, and the reaction solution was allowed to stand at 60 ° C for 3 days.

[0031] (2) The resulting red precipitate was collected by centrifugation, and was rinsed with N, N-dimethylformamide (DMF). The crude product was extracted with meth...

Embodiment 2

[0034] Preparation of a covalent organic skeleton of highly efficient high selective adsorption of mercury: steps and methods are substantially identical to Example 1, and different in step 1 in step 1 - (1,4- Phenyl) double thiourea (PA-S) is replaced with 1, 1 '- (1, 1'-biphenyl) 4,4'-double thiourea (BD-S), and prepared covalent organic skeleton surface Similar to Example 1, the resulting thiourea covalent organic skeleton was 75.2%.

Embodiment 3

[0036] Preparation of a covalent organic skeleton of highly efficient high selective adsorption of mercury: steps and methods are substantially identical to Example 1, and different in step 1 in step 1 - (1,4- Phenyl) double thioua (PA-S) is replaced by 1, 1 '- (2-methyl-1,4-phenyl) double thiourea, and the resulting covalent organic skeleton surface is similar to those of Example 1. The yield of the obtained thiourea covalent organic skeleton was 72.9%.

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Abstract

The invention provides a non-reversible thiourea connected covalent organic framework for rapidly removing mercury and a preparation method thereof. A covalent organic framework is prepared by adopting a solvothermal method, and the non-reversible thiourea connected functionalized covalent organic framework with high crystallinity, large specific surface area and strong stability is formed through special tautomerism of a non-reversible thiourea connected ketone-imine structure from a reversible enol-imine structure. The problem that the pore properties, such as the specific surface area, the pore capacity and the crystallinity, of the material are reduced after the covalent organic framework is functionally modified can be solved, a strategy method for realizing COFs functionalization by combining a functional group and a connecting bond into one is provided; moreover, the introduced thiourea function key endows the prepared covalent organic framework with the capability of quickly adsorbing mercury in a water solution with high selectivity and high capacity, a new solution is provided for efficiently removing heavy metal mercury in the water solution, and the application of the covalent organic framework as an efficient adsorbent in the field of adsorption separation is expanded.

Description

Technical field [0001] The present invention belongs to the fine metal removal technology in the aqueous solution, in particular, refers to a covalent organic skeleton, a non-reverse thiourea, which rapidly removes mercury, and its preparation method thereof. Background technique [0002] A covalent organic skeleton as an outstanding representation of the crystalline porous polymer, due to its ordered periodic rigid structure and large porosity, there is a wide range of applications in the fields of adsorbents, catalysts, sensors, and semiconductors. Different constructors make COFs a convenient function modified platform, which is deeply influenced by the physical chemistry properties of COFs, including stability, primary guest interaction and photoelectric performance. Adjustable functionality gives COFS special nature to meet various application requirements. For example, COFs after modification with a hairdictive group can be used to handle, catalytic, and sensing. The introd...

Claims

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Application Information

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IPC IPC(8): C08G12/12B01J20/26B01D15/08
CPCC08G12/12B01J20/262B01D15/08
Inventor 钱海龙杨静严秀平
Owner JIANGNAN UNIV
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