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Metal ion-organic acid complex in-situ cross-linked composite membrane and preparation and application thereof

A metal ion and in-situ cross-linking technology, applied in the field of composite membranes, can solve problems such as the difficulty in preparing thin polymer composite membranes, achieve good universality, overcome high concentration, and reduce mass transfer resistance

Active Publication Date: 2022-07-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problem that the existing cross-linking method is difficult to prepare a thin polymer composite membrane with stable performance

Method used

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  • Metal ion-organic acid complex in-situ cross-linked composite membrane and preparation and application thereof
  • Metal ion-organic acid complex in-situ cross-linked composite membrane and preparation and application thereof
  • Metal ion-organic acid complex in-situ cross-linked composite membrane and preparation and application thereof

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preparation example Construction

[0033] The invention provides a metal ion-organic acid complex-assisted in-situ cross-linked polymer composite membrane and a preparation method and application thereof, which mainly include the following steps:

[0034] (1) Anchoring the cross-linked layer on the surface of the polymer support layer

[0035]Place the polymer support layer in 0.5-3.0M NaOH solution for alkali treatment for 15-60 minutes, then soak in deionized water to remove the adsorbed alkali solution; then soak the alkali-treated polymer support layer in the metal ion solution Take it out after 3-30 minutes, wash off the residual solution on the surface of the support layer with deionized water; then take it out after soaking in an organic acid solution for 3-30 minutes, and wash off the residual solution on the surface of the support layer with deionized water. Repeat the above steps until the surface has enough cross-linking reaction sites, and after drying, a polymer support layer with a cross-linked la...

Embodiment 1

[0053] Example 1 is an in-situ cross-linked chitosan composite membrane, and the support layer of the composite membrane is a polyacrylonitrile hollow fiber membrane. The preparation process of the composite membrane includes the following steps:

[0054] (1) The polyacrylonitrile hollow fiber membrane was alkali-treated at 50° C. for 30 minutes.

[0055] (2) Soak the alkali-treated polyacrylonitrile support layer in FeCl 3 In the solution for 5 minutes, the residual solution on the surface of the support layer was washed with deionized water; then, it was soaked in a phytic acid solution for 5 minutes, and the residual solution on the surface of the support layer was washed with deionized water.

[0056] (3) A chitosan / acetic acid aqueous solution with a mass fraction of 1 wt % was prepared, and the solution was fully stirred until it was completely dissolved. The two ends of the support layer prepared in step (2) are blocked with epoxy resin quick-drying adhesive, soaked i...

Embodiment 2

[0058] The experimental operation is the same as that of Example 1, the difference is that after completing step (2), it continues to soak in FeCl 3 solution once.

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Abstract

The invention relates to a metal ion-organic acid complex in-situ cross-linked composite membrane as well as preparation and application thereof, and belongs to the field of membrane separation. The preparation method comprises the following steps: anchoring a crosslinking component on the surface of the polymer supporting layer in advance in the form of a metal ion-organic acid complex to form the crosslinking layer, and then carrying out in-situ crosslinking on the polymer on the surface of the crosslinking layer to prepare the polymer selection layer, thereby obtaining the polymer composite membrane. The polymer composite membrane is prepared by preferentially anchoring the crosslinking layer to crosslink the polymer in situ, so that the formation of a thin and compact polymer selection layer is facilitated, and the mass transfer resistance is reduced. When the prepared polymer composite membrane is applied to dehydration of an organic solvent (ethanol), compared with a polymer composite membrane prepared by a traditional cross-linking method, the separation performance is obviously improved.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more particularly, relates to a composite membrane of metal ion-organic acid complex in-situ cross-linking and its preparation and application. Background technique [0002] Membrane separation technology has low energy consumption, high efficiency and convenient operation. It has been widely used in petrochemical, pharmaceutical separation, environmental treatment and other fields, and has become one of the most popular and important methods in the industry. The core of membrane separation technology lies in the research and development of separation membranes. The ideal separation membrane needs to have excellent separation performance and mechanical properties. Therefore, composite membranes composed of a porous support layer and a separation selection layer are favored by researchers. Among them, the porous support layer is mainly used to enhance the mechanical properties of the membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00B01D61/02B01D61/00B01D61/36
CPCB01D69/125B01D69/105B01D67/0093B01D67/0088B01D61/027B01D61/002B01D61/025B01D61/362Y02A20/131
Inventor 王艳夏庆
Owner HUAZHONG UNIV OF SCI & TECH
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