A kind of preparation method of boron nitride modified layered double metal hydroxide/polyvinyl alcohol separation membrane

A hydroxide, polyvinyl alcohol technology, applied in separation methods, nitrogen compounds, chemical instruments and methods, etc., can solve the problems of cluttered internal structure of separation membrane materials, decreased separation capacity, limited application, etc., to achieve excellent compatibility, Overcome the poor mechanical strength, the method is simple and easy to operate

Active Publication Date: 2022-02-08
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lack of other active groups on the LDH sheet also shows poor compatibility, which limits its application as a filler in separation membrane materials.
In research at home and abroad, the separation membrane material prepared with LDH as filler is mainly obtained by hydrothermal treatment, which makes the internal structure of the separation membrane material messy, resulting in the mixed gas H of the separation membrane material. 2 / CO 2 Decreased separation ability

Method used

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  • A kind of preparation method of boron nitride modified layered double metal hydroxide/polyvinyl alcohol separation membrane
  • A kind of preparation method of boron nitride modified layered double metal hydroxide/polyvinyl alcohol separation membrane
  • A kind of preparation method of boron nitride modified layered double metal hydroxide/polyvinyl alcohol separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the mass percentage that prepares BN-LDH and BN-LDH / PVA mass sum is the separation membrane material of 0.5%

[0028] The specific steps are:

[0029] Step 1, preparing graphite phase carbon nitride (g-C) with a mass ratio of 3:1 3 N 4 ) and boric acid (BA) mixed aqueous solution, the mixed aqueous solution was stirred at 100 ° C until the solvent distilled water evaporated, and the well-mixed g-C was collected 3 N 4 / BA powder, calcined g-C under nitrogen atmosphere 3 N 4 / BA powder to 800 ℃, natural cooling to get BN sheet;

[0030] Step 2: Add the raw materials for synthesizing layered double metal hydroxide (LDH) into 25ml distilled water to prepare solution A, and ultrasonically treat solution A for 0.5h, wherein the raw material for synthesizing LDH is 1.282g Mg(NO 3 ) 2 ·6H 2 O, 0.938g Al(NO 3 ) 3 9H 2 O and 1.502g urea, take 30mg of the prepared BN and add 25ml of distilled water to prepare solution B, and ultrasonically treat solution B...

Embodiment 2

[0032] Embodiment 2: the mass percentage of the sum of BN-LDH and BN-LDH / PVA mass is prepared as the separation membrane material of 1%

[0033] The specific preparation method is the same as in Example 1, only the consumption of PVA particles in step 3 is 0.990 g, and the consumption of BN-LDH filler is 10 mg, finally obtaining 1% BN-LDH / PVA separation membrane material, the section of the prepared separation membrane material is partially SEM picture as figure 1 shown.

Embodiment 3

[0034] Embodiment 3: the mass percentage that prepares BN-LDH and BN-LDH / PVA mass sum is the separation membrane material of 2%

[0035] The specific preparation method is the same as in Example 1, only the consumption of PVA particles in step 3 is 0.980g, and the consumption of BN-LDH filler is 20mg, finally obtains 2% BN-LDH / PVA separation membrane material, the photograph of the prepared separation membrane material is as follows figure 2 shown.

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Abstract

The invention discloses a method for preparing a boron nitride modified layered double metal hydroxide / polyvinyl alcohol separation membrane, comprising the following steps: step 1, preparing BN material; step 2, preparing BN-LDH filler; step 3, Weigh PVA particles and add distilled water, stir vigorously at 75°C to obtain a uniformly mixed PVA solution; weigh BN‑LDH, add distilled water, and stir to obtain a uniformly mixed BN‑LDH solution; mix the above two solutions, stir for 1 hour and ultrasonicate 1h to make it fully mixed, pour the uniformly mixed BN-LDH / PVA solution into a plastic petri dish, fully dry it in an oven for 2 days, ensure that the solvent evaporates completely, and obtain the BN-LDH / PVA separation membrane material, the preparation of the present invention The method avoids the disorder of the internal structure of the separation membrane material under the condition of hydrothermal treatment, and can improve the separation membrane material's resistance to the mixed gas H 2 / CO 2 separation ability.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a method for preparing a boron nitride modified layered double metal hydroxide / polyvinyl alcohol separation membrane. Background technique [0002] Industrial production of hydrogen (H 2 ) process will generate a variety of impurity gases, such as carbon dioxide (CO 2 )Wait. At present, the industry generally adopts temperature swing adsorption or pressure swing adsorption to purify H 2 , but this adsorption method is complex in operation, high in energy consumption, and difficult to obtain high-purity H 2 . [0003] Separation membrane has the advantages of low energy consumption, high efficiency, easy processing and easy operation, etc. It is a kind of mixed gas H 2 / CO 2 Separated to obtain high-purity H 2 effective material. However, the currently reported separation membranes have complex procedures and are not easy to operate, do not meet the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D53/22C01B21/064C04B35/583C04B35/626
CPCB01D67/0079B01D69/02B01D53/228C01B21/064C01B21/0648C04B35/583C04B35/626B01D2325/24
Inventor 李旭阳郭萌李奇洋孔伟光高文超刘光印谢海泉
Owner NANYANG NORMAL UNIV
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