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Preparation method of high-throughput and multilayer sandwich type composite nano-filtration membrane

A composite nanofiltration membrane, sandwich technology, applied in the field of nanofiltration membrane, can solve the problems of deformation membrane flux and interception, and achieve the effect of high interception rate

Inactive Publication Date: 2017-02-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, further studies have shown that under pressure, the interlayer spacing of the film assembled by two-dimensional sheet materials will deform, which will have a great negative impact on the flux and interception of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using the polyacrylonitrile ultrafiltration membrane as the base membrane, it was first subjected to alkaline hydrolysis, then hydrolyzed with 2mol / L NaOH solution in a 55°C water bath for 30min, and then washed with deionized water until neutral. Prepare polyelectrolyte solution, take polydimethyldiallylamine chloride (PDDA) as example, take by weighing 0.48g PDDA and 0.70g sodium chloride, and it is mixed with the deionized water of 120ml, magnetically Stir for 1 hour to make it uniform, then it can be prepared as a PDDA (0.8 mg / ml) solution with a salt concentration of 0.1 mol / L. The graphite oxide aqueous solution was prepared by the improved hummers method and then diluted to 0.5 mg / ml, and the carboxylated multi-walled carbon nanotubes were prepared into a concentration of 0.1 mg / ml carbon nanotube aqueous solution with deionized water, and then the graphite oxide The alkene solution was ultrasonically dispersed for 3 hours, and the carbon nanotube solution was ul...

Embodiment 2

[0022] Using the polyacrylonitrile ultrafiltration membrane as the base membrane, it was first subjected to alkaline hydrolysis, then hydrolyzed with 2mol / L NaOH solution in a 55°C water bath for 30min, and then washed with deionized water until neutral. The second is to prepare a polyelectrolyte solution, weigh 0.3g PDDA and 0.70g sodium chloride, mix it with 120ml deionized water, and stir it magnetically at room temperature for 1 hour to make it uniform, and then it can be formulated with a salt concentration of 0.1mol / L of PDDA (0.5mg / ml) solution. The graphite oxide aqueous solution was prepared by the improved hummers method and diluted to 0.5 mg / ml, and the carboxylated multi-walled carbon nanotubes were made into a concentration of 0.25 mg / ml carbon nanotube aqueous solution with deionized water, and then the graphite oxide The alkene solution was ultrasonically dispersed for 3 hours, and the carbon nanotube solution was ultrasonically dispersed for 1 hour to obtain a...

Embodiment 3

[0025] The sulfonated polyethersulfone ultrafiltration membrane is used as the base membrane. Prepare polyelectrolyte solution, take chitosan as example, take by weighing 0.18g chitosan and 0.70g sodium chloride, and mix it with 0.2% dilute acetic acid of 120ml, magnetically stir 1h under normal temperature to make it even, namely It can be made into a chitosan (1.5 mg / ml) solution with a salt concentration of 0.1 mol / L. The self-negatively charged montmorillonite nanosheets were prepared into a 0.5 mg / ml dispersion, and the carboxylated carbon nanotubes were prepared into a 0.15 mg / ml dispersion, and the homogeneous dispersion was obtained by ultrasonication for 1 h.

[0026] After the assembly solution is prepared, fix the sulfonated polyethersulfone ultrafiltration membrane on the bottom of the container facing up. First, pour the chitosan solution into a container and let it stand for 15 minutes, then pour out the excess solution and rinse the remaining night on the surfa...

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Abstract

The invention discloses a preparation method of a high-throughput and multilayer sandwich type composite nano-filtration membrane. The preparation method includes: performing surface modification on an ultrafiltration basement membrane and (zero-dimensional or one-dimensional and two-dimensional) nano materials to allow the ultrafiltration basement membrane and the nano materials to be electronegative, and using cationic polyelectrolyte as the bridge to alternatively assemble the one-dimensional or zero-dimensional nano materials and two-dimensional sheet layers onto the ultrafiltration basement membrane to obtain the high-throughput composite nano-filtration membrane with a functional layer being two-dimensional nano materials sandwiched with one-dimensional or zero-dimensional nano materials. The preparation method has the advantages that the difficulty that the interlayer spacing of a two-dimensional nano layered membrane is small and the two-dimensional nano layered membrane is easy to deform during high-pressure filtration is solved effectively by the prepared functional layer, membrane throughput can be increased evidently, and the long-term stability of the membrane structure can be kept at the same time; the preparation method is simple in preparation process, and the prepared nano-filtration membrane is high in throughput and promising in application prospect in fields such as dye removing.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, in particular to a method for preparing a high-throughput multi-layer sandwich type composite nanofiltration membrane. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The pore size of the nanofiltration membrane is about several nanometers, and it is suitable for divalent or multivalent ions and molecular weights between 200 and 1000. It can be widely used in the fields of water softening, drinking water purification, wastewater treatment and reuse, dyes, antibiotics, polysaccharides and other chemical and biological products, purification and concentration. . The preparation methods of nanofiltration membranes mainly include interfacial polymerization, surface grafting and phase inversion methods, etc., but these methods have high requirements on the base membrane, and the operating condi...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D69/12B01D69/02B01D67/00B01D71/68B01D71/66B01D71/42B01D71/02
CPCB01D61/027B01D67/0079B01D69/02B01D69/12B01D71/021B01D71/024B01D71/42B01D71/66B01D71/68B01D2325/14
Inventor 李明明徐志伟钱晓明石睫杨彩云李翠玉焦晓宁
Owner TIANJIN POLYTECHNIC UNIV
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