Visual pH response COFs material based on methoxy side chain as well as preparation method and application of visual pH response COFs material

A methoxyl and side chain technology, applied in the field of visualized pH response COFs materials and its preparation, can solve the problems of restricting wide application, difficult to realize real-time feedback of pH changes, and incapable of adding real-time monitoring

Active Publication Date: 2021-09-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these changes are microscopic and difficult to observe directly.
Most of the transitions need to be confirmed by means of response characterization, such as observing its morphology changes by scanning electron microscopy (SEM), or performing contact angle tests to characterize the hydrophilic and hydrophobic properties of its surface, etc., so it is difficult to achieve real-time feedback of pH changes, limiting its wide application
Traditional acid-base indicators such as pH test paper, methyl orange, phenolphthalein indicators, etc., they can intuitively reflect the pH value through color changes, but they cannot be added to the system for real-time monitoring

Method used

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  • Visual pH response COFs material based on methoxy side chain as well as preparation method and application of visual pH response COFs material
  • Visual pH response COFs material based on methoxy side chain as well as preparation method and application of visual pH response COFs material
  • Visual pH response COFs material based on methoxy side chain as well as preparation method and application of visual pH response COFs material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for preparing a visualized pH-responsive pCOF-OMe material based on a methoxy side chain, including the following steps:

[0034] 0.24 mmol of 2,5-dimethoxyterephthalaldehyde and 0.16 mmol of 1,3,5-tris(4-aminophenyl)benzene were weighed and placed in 40 mL of acetonitrile. The system was ultrasonicated for 5-10 min, and 2 mL of acetic acid was slowly added dropwise under ultrasonic conditions. After the dropwise addition was completed, it was allowed to stand overnight. After that, the obtained solid particles were separated from the system, washed three times with anhydrous tetrahydrofuran and methanol, and then extracted and washed with anhydrous tetrahydrofuran for 48 hours in a Soxhlet extractor. Then vacuum-dried at 50° C. for 24 h to obtain yellow solid particles (pCOF-OMe).

Embodiment 2

[0036] This example provides a method for preparing a visualized pH-responsive mCOF-OMe material based on a methoxyl side chain, including the following steps:

[0037] 0.24 mmol of 2,5-dimethoxyterephthalaldehyde and 0.16 mmol of 1,3,5-tris(3-aminophenyl)benzene were weighed and placed in 40 mL of acetonitrile. The system was ultrasonicated for 5-10 min, and 2 mL of acetic acid was slowly added dropwise under ultrasonic conditions. After the dropwise addition was completed, it was allowed to stand overnight. After that, the obtained solid particles were separated from the system, washed three times with anhydrous tetrahydrofuran and methanol, and then extracted and washed with anhydrous tetrahydrofuran for 48 hours in a Soxhlet extractor. Then vacuum-dried at 50° C. for 24 h to obtain yellow solid particles (mCOF-OMe).

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Abstract

The invention discloses a visual pH response COFs material based on a methoxy side chain as well as a preparation method and application of the visual pH response COFs material, wherein an organic covalent material is prepared from a monomer material with a methoxy group, the material presents different colors in aqueous solutions with different pH values, the color change range is changed from yellow to black, and the material is relatively obvious and intuitive. Meanwhile, the material is wide in pH indication range, and effective indication can be achieved within the pH range of 0-7. The visual pH response COFs material based on the methoxyl side chain prepared by the invention is beneficial to development and research of a series of COFs based on the pH response of the methoxyl side chain (-OMe) side chain in theoretical research; in practical application, the pH test paper capable of being regenerated and recycled can be prepared, or the pH test paper can be added into a system for real-time pH detection. The material is intuitive and rapid in color response, wide in color changing range and capable of being recycled and reused, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of COFs materials, and in particular relates to a visible pH response COFs material based on a methoxyl side chain, a preparation method and an application thereof. Background technique [0002] pH is one of the important parameters of water body. The normal operation of various life activities of living organisms, domestic water, industrial and agricultural production, and natural water cycle cannot be separated from the stability of the pH value of each component in the system. In particular, in some scientific research or application fields, such as catalytic reactions involving biomacromolecules that are sensitive to pH changes, release or diagnosis of drugs and genes, chemical reactions in which pH changes during the process, and water quality detection and treatment, etc., require There is a quick response to pH changes to ensure the normal progress of the process. Therefore, pH detection technology a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/08G01N21/80
CPCC08G12/08G01N21/80G01N2021/7759
Inventor 王娜余孝其周子文
Owner SICHUAN UNIV
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