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A kind of hydrotalcite-like composite forward osmosis membrane support layer and preparation method thereof

A technology of forward osmosis membrane and hydrotalcite, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve the effect of simple preparation process, low cost and increased thermal stability

Active Publication Date: 2017-12-12
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes hydrotalcite-like modified structure of the forward osmosis membrane support layer, which has not been reported in the literature at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Polysulfone / MgAl-CO 3 The preparation of the hydrotalcite-like composite forward osmosis membrane support layer, the specific steps are:

[0024] (1) 9.6g Mg(NO 3 ) 2 ·6H 2 O and 4.7g Al(NO 3 ) 3 9H 2 O was prepared by adding 50ml of pure water to a salt solution, which was added dropwise to 2.65g Na 2 CO 3 Add 50ml of pure water to the aqueous solution. Use 4M NaOH to control its pH=12. After the mixed solution was stirred at room temperature for 12 hours, MgAl-CO 3 - LDH with a particle size of 30-50 nm. Then it was washed with pure water to pH = 7, and washed with acetone for 3 times before use.

[0025] (2) 0.12g MgAl-CO 3 - LDH was added to a mixed solvent of 33g methylpyrrolidone and 11g dimethylformamide, after ultrasonication for 30min, 6g polysulfone was added, stirred at room temperature for 8h, static defoaming for 15h, and a hydrotalcite-like / polysulfone composite casting was obtained. Membrane fluid. Then scrape the film on a clean glass plate...

Embodiment 2

[0027] Based on polysulfone / MgAl-CO 3 Preparation and performance test of hydrotalcite-like composite forward osmosis membrane

[0028] The polysulfone / MgAl-CO that embodiment 1 prepares 3The dense side of the hydrotalcite-like composite forward osmosis membrane support layer was placed in an aqueous solution of 3.4wt% m-phenylenediamine for 2 minutes, and after taking it out, the excess solution droplets on the surface were blown off with an air knife, and then the dense side was placed in 0.15wt% 1 , 3,5-Benzoyl chloride in Isopar-G organic solution for 1min, after taking it out, heat it with 95°C deionized water for 2min, then soak it in 200ppm sodium hypochlorite aqueous solution and 1000ppm sodium bisulfite aqueous solution for 2min and 0.5min respectively After taking it out, it was heat-treated with 95 degree deionized water for 2 minutes to obtain a hydrotalcite-like composite forward osmosis membrane.

[0029] At 25°C, the performance of the prepared hydrotalcite-li...

Embodiment 3

[0031] Polyethersulfone / MgAl-CO 3 The preparation of the hydrotalcite-like composite forward osmosis membrane support layer, the specific steps are:

[0032] (1) 9.6g Mg(NO 3 ) 2 ·6H 2 O and 4.7g Al(NO 3 ) 3 9H 2 O was prepared by adding 50ml of pure water to a salt solution, which was added dropwise to 2.65g Na 2 CO 3 Add 50ml of pure water to the aqueous solution. Use 4M NaOH to control its pH=12. After the mixed solution was stirred at room temperature for 12 hours, MgAl-CO 3 - LDH with a particle size of 30-50 nm. Then it was washed with pure water to pH = 7, and washed with acetone for 3 times before use.

[0033] (2) 0.16g MgAl-CO 3 -LDH was added to a mixed solvent of 21g methylpyrrolidone and 21g dimethylacetamide, after ultrasonication for 30min, 8g polyethersulfone was added, stirred at room temperature for 8h, static degassing for 15h, and a hydrotalcite-like / polyethersulfone composite was obtained Material casting solution. Then use a 100 μm spatula t...

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Abstract

The invention relates to a hydrotalcite-like composite forward osmosis membrane support layer and a preparation method thereof. The composition of the composite supporting layer includes a polymer body and hydrotalcite-like nanoparticle additive materials, and is characterized in that the hydrotalcite-like nanoparticle is highly dispersed in the polymer. The preparation method of the composite support layer comprises the steps of synthesizing and washing the hydrotalcite-like nanoparticles, mixing the hydrotalcite-like nanoparticles and polymers in an organic solvent, forming a film, and phase inversion. The hydrotalcite-like composite forward osmosis membrane support layer prepared by the present invention has higher porosity and hydrophilicity, and effectively increases the thermal stability of the support layer and the pore diameter of the support layer surface, and reduces the internal concentration polarization phenomenon , has important application prospects in the preparation of forward osmosis membranes.

Description

technical field [0001] The invention relates to a hydrotalcite-like composite forward osmosis membrane support layer and a preparation method thereof. Background technique [0002] With the growth of the world's population and the development of the social economy, the scarcity and pollution of water resources have increasingly restricted the social economy and even threatened the survival and development of human beings. Faced with increasingly serious water resource problems, water treatment technology has been widely developed, especially membrane water treatment technology, which has become an important water treatment technology because of its advantages of low energy consumption, small footprint, and good water quality. , reverse osmosis (reverse osmosis, RO) technology is one of the more mature development. However, reverse osmosis requires external pressure, so the energy consumption is relatively large, and there are also problems such as the membrane is easily pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D71/68B01D67/00
Inventor 王强逯鹏梁帅
Owner BEIJING FORESTRY UNIVERSITY
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