A method for preparing molecular sieve membranes by simulating functional modification of biological protein dopamine

A molecular sieve and functionalization technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems such as the difficulty in synthesizing molecular sieve membranes and affecting the performance of molecular sieve membranes

Active Publication Date: 2017-12-29
上海念诺膜技术有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In-situ hydrothermal synthesis is currently the most commonly used synthesis method, but because in-situ hydrothermal synthesis is very sensitive to the synthesis conditions and the chemical and physical properties of the carrier, a slight change in a certain synthesis condition will affect the performance of the molecular sieve membrane, so usually It is difficult to synthesize high-performance LTA-type and FAU-type molecular sieve membranes

Method used

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  • A method for preparing molecular sieve membranes by simulating functional modification of biological protein dopamine
  • A method for preparing molecular sieve membranes by simulating functional modification of biological protein dopamine
  • A method for preparing molecular sieve membranes by simulating functional modification of biological protein dopamine

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0056] Preparation of molecular sieve membrane

[0057] The growth mechanism of molecular sieve membranes shows that the growth of molecular sieve membranes is a heterogeneous nucleation process, that is, the precursors of aluminate ions and silicate ions in the synthesis solution first nucleate on the surface of the carrier, and then crystallize to form molecular sieve membranes. Therefore, promoting the nucleation of LTA-type and FAU-type molecular sieves on the surface of the carrier is of great significance to promote the growth of LTA-type and FAU-type molecular sieve membranes.

[0058] The invention provides a method for preparing a molecular sieve membrane, the preparation steps are as follows: figure 1 shown in . Specifically, the method includes: (1) providing a solid support; (2) performing functional modification on at least one main surface of the solid support, thereby introducing covalently bonded modifying agent to obtain a modified carrier surface; (3) hydro...

Embodiment 1

[0088] Embodiment 1. synthetic LTA type molecular sieve membrane

[0089] Step 1. Dopamine functional modification to synthesize the carrier of LTA molecular sieve membrane

[0090] Dissolve 0.3 g of dopamine in 50 mL of distilled water, stir and mix evenly, then add tris to control the pH of the solution to 8-10. Put the washed and dried porous alumina ceramic carrier into the above-mentioned dopamine buffer solution, react at room temperature for 20 hours, rinse with distilled water and ethanol and dry at room temperature, thereby introducing polydopamine on the carrier surface for the synthesis of LTA molecular sieve membrane .

[0091] Step 2, prepare the solution synthesized by LTA type molecular sieve membrane

[0092] Weigh a certain amount of NaOH and dissolve it in distilled water, add aluminum foil after clarification, and stir to form an aluminum solution; measure a certain amount of silica sol and add it to pre-heated distilled water, stir well; slowly add the pr...

Embodiment 2

[0095] Embodiment 2. synthetic LTA type molecular sieve membrane

[0096] Step 1. Dopamine functional modification to synthesize the carrier of LTA molecular sieve membrane

[0097] Dissolve 0.3 g of dopamine in 50 mL of distilled water, stir and mix evenly, then add tris to control the pH of the solution to 8-10. Put the washed and dried porous titanium dioxide ceramic carrier into the above-mentioned dopamine buffer solution, react at room temperature for 20 hours, rinse with distilled water and ethanol, and then dry at room temperature, thereby introducing polydopamine on the surface of the carrier for the synthesis of LTA molecular sieve membranes.

[0098] Step 2, prepare the solution for synthesizing LTA type molecular sieve membrane

[0099] The specific method is the same as step 2 of Example 1.

[0100] Step 3. In situ hydrothermal synthesis of LTA molecular sieve membrane

[0101] The specific method is the same as step three of example 1.

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Abstract

The invention provides a method for preparing a molecular sieve membrane by imitating the functional modification of biological protein dopamine. Specifically, the invention utilizes the excellent complexing performance of dopamine to prepare it on the surface of a carrier such as dopamine-modified porous alumina through a covalent bonding reaction. Produce LTA and FAU molecular sieve membranes with high separation performance. The molecular sieve membrane is prepared by the method of the invention, the nucleation and growth of the molecular sieve membrane are greatly enhanced, the prepared molecular sieve membrane is uniform and compact, and has excellent gas separation performance; the method of the invention has mild operating conditions, is easy to scale up industrially, is environmentally friendly, and has strong applicability.

Description

technical field [0001] The invention relates to the field of molecular sieve membrane synthesis, in particular, the invention provides a method for preparing homogeneous and compact LTA-type and FAU-type molecular sieve membranes with high separation performance through dopamine functional modification. Background technique [0002] Separation process is an important operation process in industrial production, widely used in chemical, pharmaceutical, food, biochemical, environmental protection and other industries. Compared with traditional separation methods such as distillation, rectification, and adsorption, membrane separation has the advantages of low energy consumption, easy operation, low investment, and no pollution. The key to the application of membrane separation technology is to develop membrane separation materials with high separation performance. Molecular sieve membranes have well-regulated pores with a single pore size distribution, and the pore size of mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D67/00B01D69/02B01J31/02B01J35/00
Inventor 黄爱生刘倩
Owner 上海念诺膜技术有限公司
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