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Preparation method of reverse osmosis composite membrane containing nano zeolite molecular sieves

A reverse osmosis composite membrane and nano-zeolite technology are applied in the field of preparation of a reverse osmosis composite membrane containing nano-zeolite molecular sieves, can solve problems such as no research reports, and achieve high desalination rate and water flux, good mechanical strength, and a preparation method. simple effect

Inactive Publication Date: 2011-01-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the special preparation process of the interfacial polymeric membrane, the process of adding zeolite to the reverse osmosis membrane is also different from the blending process, and when the zeolite molecular sieve is added to the water phase or oil phase, the process of film formation and the separation effect of the membrane will also be different. will vary, but no studies have reported on this

Method used

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  • Preparation method of reverse osmosis composite membrane containing nano zeolite molecular sieves
  • Preparation method of reverse osmosis composite membrane containing nano zeolite molecular sieves
  • Preparation method of reverse osmosis composite membrane containing nano zeolite molecular sieves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Disperse the LTA-type nano-zeolite molecular sieve with an average particle size of 60 nanometers in 100 ml of m-phenylenediamine aqueous solution with a concentration of 5% by weight to ensure that the concentration by weight of the LTA-type zeolite molecular sieve is 0.006%, and ultrasonically treat it for 10 minutes at room temperature to obtain a mixture 1g of polysulfone porous ultrafiltration membrane with an average pore diameter of 30 nanometers is directly immersed in the above mixture, the immersion time is 30min, the membrane is taken out, and the moisture on the surface of the membrane is naturally air-dried for 0.5h, and immediately mixed with a concentration of 0.4% by weight. 50ml of benzenetricarboxylic acid chloride n-hexane solution was subjected to interfacial polymerization reaction for 40 seconds to prepare a composite film. The composite film was dried in the air for 2 minutes, then heated in a 60°C oven for 20 minutes, and then rinsed in 40°C water ...

Embodiment 2

[0033] Disperse the LTA-type nano-zeolite molecular sieve with an average particle size of 65 nanometers into 100 ml of m-phenylenediamine aqueous solution with a concentration of 8% by weight to ensure that the concentration by weight of the LTA-type zeolite molecular sieve is 0.012%, and ultrasonically treat it for 20 minutes at room temperature to obtain a mixture 1g of polysulfone porous ultrafiltration membrane with an average pore diameter of 30 nanometers is directly immersed in the above mixture, the immersion time is 40min, the membrane is taken out, and the moisture on the surface of the membrane is naturally air-dried for 0.5h, and immediately mixed with a concentration of 0.6% by weight. 50ml of benzenetricarboxylic acid chloride n-hexane solution was subjected to interfacial polymerization reaction for 50s to prepare a composite membrane. The composite membrane was dried in the air for 2 minutes, then heated in a 60°C oven at a constant temperature for 20 minutes, a...

Embodiment 3

[0035]Disperse the LTA-type nano-zeolite molecular sieve with an average particle size of 70 nanometers in 100 ml of m-phenylenediamine aqueous solution with a concentration of 5% by weight to ensure that the concentration by weight of the LTA-type zeolite molecular sieve is 0.025%, and ultrasonically treat it for 30 minutes at room temperature to obtain a mixture 1g of polysulfone porous ultrafiltration membrane with an average pore diameter of 30 nanometers is directly immersed in the above-mentioned mixture, and the immersion time is 40min, and the membrane is taken out. 50ml of benzenetricarboxylic acid chloride n-hexane solution was subjected to interfacial polymerization reaction for 60 seconds to prepare a composite film. The composite film was dried in the air for 2 minutes, then heated in a 60°C oven at a constant temperature for 20 minutes, and then rinsed in 40°C water for 10 minutes to obtain nano Zeolite molecular sieve reverse osmosis composite membrane, the prepa...

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Abstract

The invention discloses a preparation method of a reverse osmosis composite membrane containing nano zeolite molecular sieves. The method comprises the following steps: dispersing the nano zeolite molecular sieves into polyamine aqueous solution to obtain a mixture A; dipping a polysulfone supporting membrane into the mixture A, taking out the membrane and then removing a solvent for the memebrane, carrying out interfacial polymerization on the membrane without the solvent in poly-acyl chloride solution, and after-treating the membrane after interfacial polymerization finishes to obtain the reverse osmosis composite membrane containing the nano zeolite molecular sieves; or dispersing the nano zeolite molecular sieves into the poly-acyl chloride solution to obtain a mixture B; and dipping the polysulfone supporting membrane into the polyamine aqueous solution, taking out the membrane and then removing the solvent for the membrane, carrying out interfacial polymerization on the membrane without the solvent in the mixture B, and after-treating the membrane after interfacial polymerization finishes to obtain the reverse osmosis composite membrane containing the nano zeolite molecular sieves. The reverse osmosis composite membrane containing the nano zeolite molecular sieves obtained by the preparation method of the invention has higher desalination rate, higher water flux and higher mechanical strength.

Description

technical field [0001] The invention relates to the field of preparation of reverse osmosis membranes, in particular to a preparation method of a reverse osmosis composite membrane containing nanometer zeolite molecular sieves. Background technique [0002] Reverse osmosis composite membrane, as one of the earliest industrialized membrane technologies, has been widely used in the field of seawater desalination. The reverse osmosis composite membrane is generally a membrane formed by depositing an ultra-thin functional layer on the surface of a microporous support membrane with an appropriate pore size through interfacial polymerization. The functional membrane material that has been industrialized is usually polyamide. With the increasingly serious problem of water resources, reverse osmosis technology is gradually expanding from the field of seawater desalination to wastewater treatment and other fields. Therefore, new requirements are put forward for reverse osmosis membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/10B01D69/12C02F1/44C02F103/08
CPCY02A20/131
Inventor 张林瞿新营董航陈欢林孙志林
Owner ZHEJIANG UNIV
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