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Organic-inorganic hybrid positive charge separation membrane

A technology of positively charged and separated membranes, which is applied in the field of organic-inorganic hybrid positively charged separation membranes, can solve problems affecting membrane stability, achieve increased sieving, stabilize charged groups, and improve membrane separation performance Effect

Active Publication Date: 2013-05-01
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the combination of CTAB and montmorillonite through electrostatic interaction rather than chemical bonds, CTAB in CTAB-montmorillonite is easily replaced under the condition of long-term use or the separated solution contains more electrolytes. And fall off, thereby affecting the stability of membrane (Environmental Chemistry, 2005, 24 (4): 397-400)

Method used

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  • Organic-inorganic hybrid positive charge separation membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of positively charged silicon-based molecular sieves

[0030] Adopt template method to prepare the positively charged silicon-based molecular sieve as described in table 1, the concrete preparation process comprises the method for following steps:

[0031] (1) Dissolving the stencil agent ethylene glycol-propylene glycol block copolymer in water.

[0032] (2) After adding 37% HCl aqueous solution to the solution of step (1) and fully stirring and dissolving, then adding trimethoxysilicon and tetraethoxysilicon with different positively charged groups as shown in Table 1, each compound The molar ratio of ethylene glycol-propylene glycol block copolymer: tetraethoxy silicon: positively charged triethoxy silicon: HCl: H 2 O=0.017:1.0:x:6.3:121.4, wherein the amount (x) of the positively charged silicon source can be adjusted as required.

[0033] (3) Reaction at 100° C. for 2 days, washing, filtering, and release agent to obtain the positively charg...

Embodiment 2

[0036] Example 2 Preparation of Organic-Inorganic Hybrid Positively Charged Separation Membrane

[0037] Using the silicon-based molecular sieve prepared in Preparation Example 1 as the inorganic raw material, an organic-inorganic hybrid positively charged separation membrane was prepared according to the following Table 2.

[0038] Table 2 Organic-inorganic hybrid positively charged separation membrane

[0039]

[0040]

[0041] The solvent, the organic polymer and the molecular sieve are mixed and vigorously stirred for 6-8 hours to ensure that the positively charged silicon-based molecular sieve is uniformly dispersed in the hydrophobic polymer. Apply the casting solution on the substrate at room temperature to form a film, place it at room temperature for 8 hours to evaporate the solvent, and then keep it in a vacuum oven at 60°C for 12 hours to obtain an organic-inorganic hybrid positively charged film Mn .

Embodiment 3

[0042] Example 3 Detection of Organic-Inorganic Hybrid Positively Charged Separation Membrane Performance

[0043] Taking "M2-SA2" in Table 2 as an example, dyes with different molecular weights and charging characteristics were used as test objects to investigate the retention characteristics of the organic-inorganic hybrid positively charged separation membrane of the present invention, as shown in Table 3. It can be seen from Table 3 that the rejection rates of Coomassie Brilliant Blue and Methyl Orange, which also have a negative charge of 1 unit, are 99% and 39%, respectively, because the chargeability of these two dyes is related to the charge of the membrane. The properties are opposite, so the membrane mainly intercepts them through the sieving mechanism. Since the molecular weight of Coomassie brilliant blue is relatively large, the membrane has a higher rejection rate for the value. As for crystal violet and methylene blue, although their molecular weight is similar ...

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Abstract

The invention relates to the field of membranes and relates to an organic-inorganic hybrid positive charge separation membrane. The separation membrane provided by the invention is prepared from an organic polymer and a positive charge silica based molecular sieve; the framework of the silica based molecular sieve is Si-O-Si; a positive charge group serving as a substituent group is connected with the framework; the mass ratio of the organic polymer to the positive charge silica based molecular sieve is 0.3-19; and the granular size of the positive charge silica based molecular sieve is 0-10 microns. The charge molecular sieve adopted in the invention is an inorganic filler; and the sieving action and electrostatic interaction of the membrane to separated substances are increased, so thatthe membrane separation performance is improved. The charge group only serves as a substituent group to be connected with Si on the framework, but not serves as the framework component structure of the molecular sieve, therefore the increment of the charge group content does not influence the tolerance and stability of the molecular sieve; the positive charge group in the membrane provided by theinvention is connected to the Si-O-Si in the molecular framework through a chemical bond, but not adsorbed onto the framework by virtue of the electrostatic interaction, so that the charge group is more stable.

Description

technical field [0001] The invention relates to the field of membranes, in particular to an organic-inorganic hybrid positively charged separation membrane. Background technique [0002] Membrane separation technology has developed rapidly since the 1950s, and has been widely used in water treatment, chemical industry, biology, medicine, food and other fields, forming a considerable industrial scale. Charged membrane refers to a separation membrane with charged groups on the surface or inside, which has charging characteristics. It can not only achieve separation through the sieving effect of the membrane aperture, but also through the electrostatic interaction between the separated substance and the membrane. Separation, which has a better separation effect than uncharged membranes, has been widely used in pervaporation, gas separation, ion exchange, and nanofiltration. Traditional charged separation membranes are mostly prepared by using charged polymers as membrane mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06
Inventor 苏仪万印华黄瑞强
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI