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Method for preparing hydrotalcite composite film by back diffusion technology

A reverse diffusion and hydrotalcite technology is applied in the field of membrane separation to achieve the effects of enhanced operation stability, simple preparation process and good binding force

Inactive Publication Date: 2017-07-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention provides a method for preparing a hydrotalcite composite membrane by reverse diffusion technology, which is used for the dehydration of pervaporation organic matter, can realize the uniform growth and uniform size of hydrotalcite on the substrate, and effectively overcome the problems that many inorganic materials are difficult to nucleate on the porous substrate.

Method used

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  • Method for preparing hydrotalcite composite film by back diffusion technology

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Using a commercial porous membrane as α-Al 2 o 3 The material, in the form of a three-dimensional tube, has a membrane area of ​​10 cm 2 . The selected hydrotalcite is CoAl-CO 3 , whose precursor metal ions are cobalt nitrate and zinc nitrate, to which urea and ammonium fluoride need to be added as buffer reagents and etchant.

[0024] Preparation method of hydrotalcite ceramic composite membrane:

[0025] (1) To pretreat the commercial tubular ceramic substrate, first soak the ceramic substrate in pure hydrochloric acid for 30 minutes, rinse with deionized water and ultrasonically vibrate to remove the residual acid in the membrane pores;

[0026] (2) Soak the pickled ceramic substrate in ammonia solution for 30 minutes, rinse with deionized water and ultrasonically vibrate to remove the residual alkali in the membrane pores, and then place the ceramic substrate in an oven at a certain temperature to dry for use;

[0027] (3) cobalt nitrate and aluminum nitrate ar...

Embodiment 2

[0033] Using a commercial porous membrane as α-Al 2 o 3 The material, in the form of a three-dimensional tube, has a membrane area of ​​10 cm 2 . The selected hydrotalcite is CoAl-CO 3 , whose precursor metal ions are cobalt nitrate and zinc nitrate, to which urea and ammonium fluoride need to be added as buffer reagents and etchant.

[0034] Preparation method of hydrotalcite-like ceramic inorganic composite membrane:

[0035] (1) To pretreat the commercial tubular ceramic substrate, first soak the ceramic substrate in pure hydrochloric acid for 30 minutes, rinse with deionized water and ultrasonically vibrate to remove the residual acid in the membrane pores;

[0036] (2) Soak the pickled ceramic substrate in ammonia solution for 30 minutes, rinse with deionized water and ultrasonically vibrate to remove the residual alkali in the membrane pores, and then place the ceramic substrate in an oven at a certain temperature to dry for use;

[0037] (3) Dissolve cobalt nitrate...

Embodiment 3

[0043] Using a commercial porous membrane as α-Al 2 o 3 The material, in the form of a three-dimensional tube, has a membrane area of ​​10 cm 2 . The selected hydrotalcite is CoAl-CO 3 , whose precursor metal ions are cobalt nitrate and zinc nitrate, to which urea and ammonium fluoride need to be added as buffer reagents and etchant.

[0044] Preparation method of hydrotalcite-like ceramic inorganic composite membrane:

[0045] (1) To pretreat the commercial tubular ceramic substrate, first soak the ceramic substrate in pure hydrochloric acid for 30 minutes, rinse with deionized water and ultrasonically vibrate to remove the residual acid in the membrane pores;

[0046] (2) Soak the pickled ceramic substrate in ammonia solution for 30 minutes, rinse with deionized water and ultrasonically vibrate to remove the residual alkali in the membrane pores, and then place the ceramic substrate in an oven at a certain temperature to dry for use;

[0047] (3) Dissolve cobalt nitrate...

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Abstract

The invention relates to a method for preparing a hydrotalcite composite film by a back diffusion technology, which belongs to the technical field of membrane separation. The method comprises the following steps: a porous substrate is pre-treated, two metal ion solutions for synthesis of hydrotalcite are respectively placed at two sides of a base film, through regulation and control of two metal ionic mol ratio, precursor concentration, synthesis temperature and reaction time, the solutions containing the metal ions are diffused in a porous structure of the base film, and are subjected to a reaction to generate hydrotalcite, and then the material is dried. The method can realize uniform growth and uniform size of hydrotalcite on the substrate surface and inner part, and can effectively overcome the problem of difficult nucleation of many inorganic materials on a substrate.

Description

technical field [0001] The invention relates to a method for preparing a hydrotalcite composite membrane by reverse diffusion technology, which is used for dehydration of pervaporation organic matter and belongs to the field of membrane separation. Background technique [0002] The pervaporation membrane process is a separation technology that separates, purifies, and concentrates liquid mixtures. The upstream side of the membrane is in contact with the feed liquid, and the downstream side adopts exhaust gas purging or vacuum to form a negative pressure condition. The molecules of the feed liquid pass through the separation layer of the membrane driven by the chemical potential difference on both sides of the membrane. Pervaporation membrane separation technology has a good separation effect on systems with similar molecular volumes or similar boiling points, such as dehydration of organic solvents, removal of organic solvents from water, and separation of organic mixed solu...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/02B01D61/36
CPCB01D61/362B01D67/0044B01D69/12B01D71/02B01D71/024B01D71/025
Inventor 王乃鑫李晓婷黄政安全福纪淑兰
Owner BEIJING UNIV OF TECH
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