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Multifunctional acid-base indication filter membrane and preparation method thereof

An acid-base indicating and multi-functional technology, which is applied in the field of multi-functional acid-base indicating filter membrane and its preparation, can solve the problems of narrow response range of detection unit, large ecological environment harm, limited application fields, etc., and achieves low biological toxicity, The aperture can be intelligently adjusted and the effect of wide application fields

Active Publication Date: 2021-10-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, pH acid-base indicator test paper is the most commonly used and most convenient detection method, but limited by the narrow response range of the detection unit, the detection function of this pH test paper is generally composed of methyl red and bromocresol green. , Thymol blue and phenolphthalein and other chromogenic substances are synergistically realized, not only the preparation process is complicated, but also these chromogenic substances are more harmful to the ecological environment and have higher biological toxicity, which limits their application fields (such as the field of biomedicine)

Method used

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  • Multifunctional acid-base indication filter membrane and preparation method thereof
  • Multifunctional acid-base indication filter membrane and preparation method thereof
  • Multifunctional acid-base indication filter membrane and preparation method thereof

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preparation example Construction

[0035] A preparation method for an acid-base indicating filter membrane, comprising the following steps:

[0036] A) Mix absolute ethanol, nanoparticles and ammonia water evenly under the protection of an inert gas, add a silane coupling agent drop by drop, react under an inert gas atmosphere at 50-70°C, and collect the solid particles by centrifugal washing; take the solid particles and trigger Reagent (preferably 2-bromoisobutyryl bromide, benzophenone or N-carbazole dithioformic acid 1,4-p-dimethylbenzene diester) was reacted, and the solid precipitate was collected by centrifugal washing.

[0037] B) Grafting the nanoparticles with the initiator on the surface and the color-developing substance, solvent (preferably a mixture of trifluoroethanol and water or methanol, a mixture of isopropanol and water, deionized water, acetone), other initiators And / or the catalyst is mixed evenly, after repeated vacuum pumping and inert gas circulation, react at 70-80°C for 6-24h to obtai...

Embodiment 1

[0043] Add 50ml of absolute ethanol, 5g of nano-silicon dioxide particles, and 50μL of ammonia water to a 150ml round-bottomed flask in sequence, and pass nitrogen gas. After stirring until fully mixed, add 1ml of 3-aminopropyltriethoxysilane dropwise. (APTES) silane coupling agent, after reacting for 12 hours under a nitrogen atmosphere at 60 ° C, the silica solid particles at the bottom were collected by centrifugation at 6000 rpm. Take 5g of the nano-silica particles synthesized above, add 0.3ml of dry pyridine at 0°C in turn, add 5ml of 2-bromoisobutyryl bromide dropwise, react at room temperature for 12 hours, and collect the precipitated solid at the bottom by centrifugation at 6000rpm particles. Take 500mg of silica solid particles of the above-mentioned grafting initiator, and add 2.48g of chromogenic substance, 4ml of methanol, 4ml of trifluoroethanol, 100μL of Me6TREN, 38mg of CuBr in sequence, after several times of vacuum pumping-N 2 After cycling, the system was ...

Embodiment 2

[0045] Add 50ml of absolute ethanol, 5g of nano-silicon dioxide particles, and 50μL of ammonia water to a 150ml round-bottomed flask in sequence, and feed nitrogen gas for 15min. After stirring evenly, add 5ml of 3-aminopropyltriethoxysilane (APTES) dropwise. ) silane coupling agent, after reacting for 12 hours under a nitrogen atmosphere at 60° C., the silica solid particles at the bottom were collected by centrifugal washing at 6000 rpm. Take 5g of the above-mentioned synthesized nanoparticles, and add another 100mg RAFT reagent into a 25ml flask, and add 2g of chromogenic substance SVBP, 0.1gAIBN, 6ml of deionized water in turn, and after several times of vacuum pumping-through N 2 After cycling, the system was reacted at 75° C. for 24 h. Finally, the silicon dioxide modified by the chromogenic substance is self-assembled and accumulated on the polytetrafluoroethylene membrane substrate by suction filtration.

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Abstract

The invention relates to the field of detection materials, and discloses a multifunctional acid-base indication filter membrane and a preparation method thereof. The filter membrane comprises a substrate membrane and color developing nanoparticles attached to the surface of the substrate membrane, wherein the color developing nanoparticles are nanoparticles formed by polymerizing and modifying the surface of a color developing substance; and the color developing substance is prepared from 4-pyridineethanesulfonic acid and 4-chloromethylstyrene through a substitution reaction. The color developing substance disclosed by the invention can realize rapid and sensitive color change under an acid-base change condition; and the biotoxicity of the color developing substance is low. The preparation method comprises the following steps: firstly, grafting a pH-responsive polymer brush (the color developing substance) on the surfaces of the nanoparticles, and then attaching the nanoparticles to the surface of the substrate membrane in a self-assembling manner, so the obtained multifunctional acid-base indication filter membrane has efficient and rapid pH value detection performance; and meanwhile, the filter membrane has the advantages of intelligently adjustable aperture, low bacterial adhesion, desorption regeneration performance, excellent dynamic antifouling property and the like, and has wide research prospects in the fields of environmental detection and chemical filtration.

Description

technical field [0001] The invention relates to the field of detection materials, in particular to a multifunctional acid-base indicating filter membrane and a preparation method thereof. Background technique [0002] The pH value of acidity and alkalinity is an important indicator of the state of matter in nature. The properties of matter and the changes in various environments can be objectively evaluated by the pH value of its state. [0003] At present, the means of detecting the pH value are mainly divided into two types: the detection of the change of the physical conductivity of the system environment and the detection of the change of the chemical color reaction. Among them, pH acid-base indicator test paper is the most commonly used and most convenient detection method, but limited by the narrow response range of the detection unit, the detection function of this pH test paper is generally composed of methyl red and bromocresol green. The synergistic realization of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16C08F292/00C08F212/14
CPCB01D39/16C08F292/00B01D2239/0407B01D2239/10C08F212/30
Inventor 杨晋涛倪乙凤王晓宇张冬郑司雨
Owner ZHEJIANG UNIV OF TECH
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