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Preparation method of boron nitride-modified layered double hydroxide/polyvinyl alcohol separation membrane

A technology of hydroxide and polyvinyl alcohol, which is applied in the direction of separation methods, nitrogen compounds, chemical instruments and methods, etc., can solve the problems of separation membrane materials such as internal structure disorder, separation ability decline, and limited application, and achieve excellent compatibility, The effect of overcoming the poor mechanical strength and the method is simple and easy to operate

Active Publication Date: 2020-09-25
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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  • Preparation method of boron nitride-modified layered double hydroxide/polyvinyl alcohol separation membrane
  • Preparation method of boron nitride-modified layered double hydroxide/polyvinyl alcohol separation membrane
  • Preparation method of boron nitride-modified layered double hydroxide/polyvinyl alcohol separation membrane

Examples

Experimental program
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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 preparation method of a boron nitride-modified layered double hydroxide / polyvinyl alcohol separation membrane. The preparation method comprises the following steps: step 1, preparing a BN material; step 2, preparing a BN-LDH filler; and 3, weighing PVA particles, adding distilled water, conducting violent stirring and mixing at 75 DEG C to obtain a uniformly mixed PVA solution, weighing BN-LDH, adding distilled water, carrying out stirring to obtain a uniformly mixed BN-LDH solution, mixing the two solutions, conducting stirring for 1 hour, carrying out ultrasonic treatment for 1 hour to fully mix the two solutions, pouring the uniformly mixed BN-LDH / PVA solution into a plastic culture dish, and carrying out sufficient drying in a drying oven for 2 days to guarantee that solvents are totally evaporated so as to obtain the BN-LDH / PVA separation membrane. According to the preparation method disclosed by the invention, the disorder of an internal structure of a separation membrane material under a hydrothermal treatment condition is avoided, and the separation capability of the separation membrane on the gas mixture H2 / CO2 can be improved.

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 Applications(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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