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Method for preparing organic-inorganic nano-composite membranes by using layered inorganic nano particles

An inorganic nano and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy reassembly or agglomeration of nanosheets, achieve convenient operation, simple equipment, and overcome easy agglomeration Effect

Inactive Publication Date: 2014-05-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Many metal, non-metal oxide or hydroxide nanoparticles, clay, etc. have a layered structure, which can be effectively exfoliated by certain methods, but the exfoliated nanosheets are prone to reassembly or agglomeration during the drying process, thus in To some extent, their application is limited
There have been some reports on organic-inorganic hybrid membranes of inorganic nanomaterials with a layered structure, but there are few reports on the preparation of organic-inorganic nanocomposite membranes by exfoliating layered inorganic nanomaterials in situ

Method used

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  • Method for preparing organic-inorganic nano-composite membranes by using layered inorganic nano particles
  • Method for preparing organic-inorganic nano-composite membranes by using layered inorganic nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Preparation and in situ exfoliation of highly crystalline Zn / Al carbonate hydrotalcite

[0030] 0.20 mol of ZnSO 4 ·7H 2 O, 0.05 mol of Al 2 (SO 4 ) 3 18H 2 Add O into 135mL deionized water and stir well to dissolve to form a salt solution. Another weighed 20.90 g NaOH and 17.20 g NaOH 2 CO 3 Dissolve in 135 mL deionized water to form an alkaline solution. Mix the above two solutions well and slowly add them dropwise into 108 mL of deionized water, adjust the pH to 10, then reflux for 8 h for crystallization, filter with suction after the reaction, fully dry at 60°C, and grind into a powder for future use. use.

[0031] Disperse 0.5 g of the prepared Zn / Al hydrotalcite in 0.75 mol NaNO 3 and 0.0025 mol HNO 3 500 mL of aqueous solution, in N 2 Protect the reaction at room temperature with magnetic stirring (or shaking) for one day. After the reaction, centrifuge to remove the supernatant, wash with deionized water several times, and dry in vacuum.

...

Embodiment 2

[0037] The first step: the preparation of high crystallinity Zn / Al carbonate hydrotalcite and the steps and methods of ion intercalation exchange are as in Example 1.

[0038] 0.022 g NO 3 - The exchanged Zn / Al hydrotalcite was dispersed in 77 g DMAc, in N 2 Shake the reaction (170 rpm) for 1 day under protection, and centrifuge to remove the unexfoliated hydrotalcite to obtain a DMAc colloidal solution of Zn / Al hydrotalcite nanosheets.

[0039] Step 2: Preparation of exfoliated Zn / Al hydrotalcite nanosheets / polyethersulfone nanofiltration membrane

[0040] The formulation of the casting solution is: 22g of PES (polyethersulfone); 1g of PVP (polyvinylpyrrolidone, Mn=24000); 77g of DMAc colloidal solution of Zn / Al hydrotalcite nanosheets.

[0041] Add PVP and PES respectively to the DMAc colloidal solution of Zn / Al hydrotalcite nanosheets under constant mechanical stirring, stir well for 12 hours to fully dissolve them, and form a uniform and transparent casting solution. Fil...

Embodiment 3

[0043] The first step: the preparation of high crystallinity Zn / Al carbonate hydrotalcite and the steps and methods of ion intercalation exchange are as in Example 1.

[0044] 0.044 g NO 3 - The exchanged Zn / Al hydrotalcite was dispersed in 77 g DMAc, in N 2 Shake the reaction (170 rpm) for 1 day under protection, and centrifuge to remove the unexfoliated hydrotalcite to obtain a DMAc colloidal solution of Zn / Al hydrotalcite nanosheets.

[0045] Step 2: Preparation of exfoliated Zn / Al hydrotalcite nanosheets / polyethersulfone nanofiltration membrane

[0046] Steps and methods are as in Example 2.

[0047] Mechanical properties of the obtained Zn / Al hydrotalcite nanosheets / polyethersulfone hybrid nanofiltration membrane:

[0048] The mechanical properties of the hybrid film were tested by UTM2203 electronic universal tester (Jinan Huike Testing Equipment Co., Ltd.). The stretching rate is 5mm / min, and the stretching sensor is 100N.

[0049] In order to illustrate the super...

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Abstract

The invention belongs to the technical field of membrane preparation, and particularly relates to a method for preparing organic-inorganic nano-composite membranes by using layered inorganic nano particles, wherein the layered inorganic nano particles after being stripped by using an in-situ stripping method are used for the preparation of organic-inorganic nano-composite membranes. The method for preparing organic-inorganic nano-composite membranes by using layered inorganic nano particles disclosed by the invention is easy to operate, and simple in equipment, and can effectively overcome the disadvantages that inorganic nanomaterials are easily agglomerated, and difficult to be uniformly dispersed in the process of film forming.

Description

[0001] technical field [0002] The invention belongs to the technical field of membrane preparation, and in particular relates to a method for preparing an organic-inorganic nanocomposite membrane by exfoliating layered inorganic nanoparticles in situ. Background technique [0003] Membrane separation technology can be widely used in the fields of separation, concentration, purification and refining, and has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration, simple process and easy automatic control, etc. It has become one of the most important means in today's separation science . [0004] In the application of membrane separation technology, the separation function of the membrane mainly depends on the properties and structure of the membrane material. Single organic polymer membranes and inorganic membranes limit their applications to some extent due to their own defects. The organic-inorganic hybrid membrane ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00
Inventor 张亚涛刘金盾余亮张浩勤
Owner ZHENGZHOU UNIV
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