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Preparation method and application of a vinyl-bridged organic silicon membrane modified by sulfonic acid group functionalization

A sulfonic acid functional and sulfonic functional technology, which is applied in the preparation of vinyl bridged silicone membranes, can solve the problems of hydrophobicity, large pore size of BTESEthy network, etc., to enhance affinity, improve water flux, reduce The effect of small effective aperture

Active Publication Date: 2022-03-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of large pore size and hydrophobicity of the existing BTESEthy network, the present invention provides a method for preparing a hydrophilic organosilicon hybrid membrane, and prepares an organosilicon that can simultaneously improve water flux and salt rejection rate. membrane

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  • Preparation method and application of a vinyl-bridged organic silicon membrane modified by sulfonic acid group functionalization
  • Preparation method and application of a vinyl-bridged organic silicon membrane modified by sulfonic acid group functionalization
  • Preparation method and application of a vinyl-bridged organic silicon membrane modified by sulfonic acid group functionalization

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Embodiment 1

[0022] Example 1: Preparation of sulfonic acid functionalized hybrid silicon membrane by post-treatment modification

[0023] The preparation method of the sulfonic acid functionalized hybrid silicon membrane of this embodiment comprises the following steps:

[0024] Step 1, preparation of mercapto-functionalized organosilica sol:

[0025] (1) Dissolve the organosilicon precursor BTESEthy and γ-mercaptopropyltriethoxysilane (MPTES) in absolute ethanol, add a certain amount of deionized water while stirring in a water bath at 40°C, and then add it dropwise A certain amount of hydrochloric acid. Stirring was continued for 2h to obtain organosilicon sol. Wherein, the molar ratio of each material is silicon source precursor: H 2 O:HCl=1:120:0.1 (wherein the molar ratio BTESEthy:MPTES=2). And keep the mass fraction of organosilicon precursor at 5.0%.

[0026] Step 2, preparation of hybrid silicon membrane modified by sulfonic acid group functionalization:

[0027] (1) Using t...

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Abstract

The invention discloses a preparation method and application of a sulfonic acid group functionalized modified vinyl bridging organic silicon membrane. Wherein the preparation method comprises the following steps: (1) dissolving vinyl bridged organosilicon precursor (BTESEthy) and MPTES in absolute ethanol, then adding a certain amount of deionized water, then adding a certain amount of hydrochloric acid dropwise, Perform hydrolysis-polymerization reaction while stirring at a certain temperature to obtain organosilicon polymerization sol. (2) Coating the obtained organosilicon sol on Al 2 o 3 The ceramic tube support body is calcined at a high temperature to obtain an organosilicon hybrid film. (3) Immerse the obtained organosilicon hybrid film in a certain concentration of acidic hydrogen peroxide solution, react for 4 hours under airtight and opaque conditions, carry out in-situ sulfonation modification, and finally obtain the sulfonic acid group functionalized modification Sexually bridged silicone hybrid membranes. After being treated with acidic hydrogen peroxide, its hydrophilicity is improved, and it shows good separation performance in the field of reverse osmosis desalination.

Description

technical field [0001] The invention belongs to the field of separation membrane preparation, and in particular relates to a preparation method and application of a sulfonic acid group functionalized modified vinyl bridging organic silicon membrane. Background technique [0002] Among many bridging silicone materials, vinyl bridging silicone materials are a class with very promising development prospects. Compared with inorganic membrane materials, this type of membrane material has better hydrothermal stability and chlorine resistance, such as 1,2-bis(triethoxysilyl)ethylene (BTESEthy), but the organic silicon prepared by BTESEthy The large pore size of the membrane is not conducive to the selective separation of water and other ions; at the same time, BTESEthy contains a hydrophobic organic bridging group (-CH=CH-), which makes the membrane exhibit a lower water content during the reverse osmosis process. permeability. This also limits the development and application of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/70B01D69/02B01D67/00B01D61/02
CPCB01D71/70B01D69/02B01D67/0006B01D61/025B01D2325/36Y02A20/131
Inventor 徐荣杨源钟璟任秀秀吴楠桦李晶
Owner CHANGZHOU UNIV