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Two-dimensional layered zeolite molecular sieve membrane with high separation stability as well as preparation method and application thereof

A zeolite molecular sieve membrane and two-dimensional layered technology, which is applied in the field of high separation stability two-dimensional layered zeolite molecular sieve membrane and its preparation, can solve the problems of uncontrollable growth process, poor application and promotion, and complicated preparation conditions. Achieve good separation and selectivity, easy preparation and simple operation

Active Publication Date: 2021-01-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing methods for preparing zeolite membranes by in-situ growth are secondary growth on hollow fiber membranes. The preparation conditions are complicated, the growth process is uncontrollable, the base membrane is single, and the application and promotion are not strong, and they are all applied in gas separation. , no application in filtration and separation of pollutants in water treatment

Method used

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  • Two-dimensional layered zeolite molecular sieve membrane with high separation stability as well as preparation method and application thereof
  • Two-dimensional layered zeolite molecular sieve membrane with high separation stability as well as preparation method and application thereof
  • Two-dimensional layered zeolite molecular sieve membrane with high separation stability as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0041] A method for preparing a two-dimensional layered zeolite molecular sieve membrane with high separation stability, the steps are as follows:

[0042] (1) Add 10.7ml cycloheximide, 1.4g sodium hydroxide and 0.75g sodium aluminate to 185ml distilled water and stir, add 38.4ml silica sol (30%) to the system to make a mixed solution, and mix the mixed solution After stirring and aging for 5 hours, it was transferred to a polytetrafluoroethylene-lined stainless steel kettle, and crystallized at 150 ° C for 16 days. After the crystallization was completed, it was washed to neutrality and dried to obtain a zeolite precursor (MCM-22( P));

[0043] (2) After stirring the zeolite precursor (MCM-22(P)): CTAB:TPAOH=1:4:1 at room temperature for 16 hours, washing and centrifuging to remove excess swelling agent, the swollen MWW group zeolite MCM-22 was obtained ( S), take 1g of MCM-22(S) and 10ml of hydroxyl-terminated polybutadiene and mix it with ultrasonic for 24 hours to make a ...

Embodiment 2

[0046] A method for preparing a two-dimensional layered zeolite molecular sieve membrane with high separation stability, the steps are as follows:

[0047] (1) Add 12.49ml cycloheximide, 1.8g sodium hydroxide and 0.36g sodium aluminate to 133ml distilled water and stir, add 36.58ml silica sol (30%) to the system to make a mixed solution, and mix the mixed solution After stirring and aging for 24 hours, it was transferred to a polytetrafluoroethylene-lined stainless steel kettle, and crystallized at 160 ° C for 21 days. After the crystallization was completed, it was washed to neutrality and dried to obtain a zeolite precursor (MCM-22( P));

[0048] (2) After stirring the zeolite precursor (MCM-22(P)): CTAB:TPAOH=1:5.6:2.4 at room temperature for 16 hours, washing and centrifuging to remove excess swelling agent, the MWW group zeolite MCM-22 ( S), take 1 g of MCM-22 (S) and 10 ml of hydroxyl-terminated polybutadiene and stir in chaotic flow for 1 hour to prepare a 10% two-dime...

Embodiment 3

[0051] A method for preparing a two-dimensional layered zeolite molecular sieve membrane with high separation stability, the steps are as follows:

[0052] (1) 0.17g Al 2 (SO 4 ) 3 18H 2 O and 0.4ml H 2 SO 4 Add 300ml of distilled water, dissolve and add 1.86g [C 22 h 45 -N + (CH 3 ) 2 -C 6 h 12 -N + (CH 3 ) 2 -C 6 h 13 ]Br 2 and 12.7ml of ethanol, then 0.5g of NaOH was added, and 15.4ml of tetraethyl orthosilicate was added dropwise to the above system under vigorous stirring to make a mixed solution. In a stainless steel kettle lined with vinyl fluoride, crystallize at 160°C for 7 days. After the crystallization, wash with water until neutral, and dry to obtain the zeolite precursor (MFI);

[0053] (2) Stir 1 g of zeolite precursor (MFI) and 10 ml of carboxyl-terminated polybutadiene in chaotic flow for 1 hour to prepare a 10% two-dimensional zeolite suspension.

[0054] (3) After diluting 10% of the two-dimensional zeolite suspension to 1g / L with toluene,...

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Abstract

The invention relates to a two-dimensional layered zeolite molecular sieve membrane with high separation stability, which is prepared by vacuum filtration of stripped two-dimensional zeolite suspension onto a support body, and is prepared by creatively diluting the two-dimensional zeolite suspension, loading the diluted two-dimensional zeolite suspension onto the support body through vacuum filtration, and drying the loaded two-dimensional zeolite suspension to obtain the two-dimensional layered zeolite molecular sieve membrane with high separation stability. The two-dimensional layered zeolite molecular sieve membrane with high separation stability is simple to operate and good in performance, can realize accurate screening of nano-molecules, has membrane stability, good water flux and good separation selectivity for molecular pollutants of 2 nm or above, is high in membrane stability, and is simple and convenient to prepare, And a new possibility is provided for the application of zeolite in water treatment.

Description

Technical field: [0001] The invention relates to a two-dimensional layered zeolite molecular sieve membrane with high separation stability and its preparation method and application, belonging to the technical field of membrane preparation of functional materials. Background technique: [0002] In recent years, with the increasing global warming and increasing population, the shortage of fresh water resources and water pollution have become increasingly serious. Water treatment technology is to remove pollutants in water and improve water quality through physical, chemical, physical and biological methods, so that the water body meets the water quality requirements. The complexity of pollutants and strict water quality standards have made many traditional methods unable to meet the needs of the current stage. Therefore, in the case of ever-decreasing water resources, it is particularly important to find efficient, energy-saving, and green water treatment technologies to sol...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01D71/02B01D67/00C02F1/44
CPCC01B39/04B01D71/028B01D67/0051C02F1/44C01P2004/03C01P2004/01Y02C20/40
Inventor 王志宁纪晓妍杜聪慧
Owner SHANDONG UNIV
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