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Polyvinyl alcohol composite nanofiltration membrane preparation method

A composite nanofiltration membrane and polyvinyl alcohol technology, which is applied in the field of filtration membranes, can solve the problems of easy shedding of surface inorganic materials, high retention rate of divalent ions, affecting the service life of membranes, etc., and achieves easy industrial production, simple process and low cost. low cost effect

Inactive Publication Date: 2016-01-06
BEIJING ORIGIN WATER FILM TECH
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Problems solved by technology

However, the method of polymerizing inorganic materials through chemical bond self-assembly on the surface of the membrane must have the problem that the surface inorganic materials are easy to fall off in practical applications, which affects the service life of the membrane.
[0006] Nanofiltration is a low-pressure driven membrane between reverse osmosis and ultrafiltration. It has a high rejection rate for multivalent anions and organic compounds with a molecular weight above 300, and has a high separation effect on organic mixed solutions containing multivalent salts. Poor, the current commercial composite nanofiltration has a low rejection rate of monovalent ions and a high rejection rate of divalent ions, which cannot achieve the purpose of separating organic matter and salts

Method used

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  • Polyvinyl alcohol composite nanofiltration membrane preparation method

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preparation example Construction

[0026] Such as figure 1 As shown, the preparation method of the polyvinyl alcohol composite nanofiltration membrane according to the embodiment of the present invention comprises the following steps:

[0027] S1. Prepare a mixed aqueous solution of polyvinyl alcohol and inorganic nanoparticles.

[0028] S2. Providing a dialdehyde, and mixing the dialdehyde with water to obtain a dialdehyde crosslinking agent solution.

[0029] S3. Mix the mixed aqueous solution in step S1 and the binary aldehyde crosslinking agent solution in step S2, and then coat it on the polysulfone membrane, and leave it to stand to obtain a composite membrane.

[0030] S4, placing the composite membrane at a predetermined temperature for a predetermined time to obtain a polyvinyl alcohol composite nanofiltration membrane.

[0031] Therefore, according to the preparation method of the polyvinyl alcohol composite nanofiltration membrane of the embodiment of the present invention, the method has simple pr...

Embodiment 1

[0053] Mix 5% polyvinyl alcohol PVA-GH-20 and 0.5% titanium dioxide with a particle size of 50-150 nanometers, add 30% glycerin, dispersant is n-butanol, add 0.4% sulfuric acid after stirring, and then mix with the prepared Mix the 1.8% glutaraldehyde aqueous solution evenly and put it into the feed liquid tank of a small slit extrusion coater, place the wetted polysulfone base film on the coater, and control the coater to mix polyvinyl alcohol and dialdehyde The mixed solution was evenly coated on the polysulfone-based membrane and left to stand for 2 minutes; then the composite membrane was treated at 100°C for 5 minutes to form the polyvinyl alcohol nanofiltration membrane; the molecular weight cut-off of the polysulfone-based membrane was between 4-6 Ten thousand.

[0054] The polyvinyl alcohol composite nanofiltration membrane prepared by the above method has a rejection rate of 2.91% to 200ppmNaCl solution under 0.41MPA, a rejection rate of 10.96% to magnesium sulfate, a...

Embodiment 2

[0056] The preparation method of this example is substantially the same as that of Example 1 above, except that in this example, the polyvinyl alcohol is 4% Selvol540, the inorganic nanoparticles are 0.05% nano-MOF-5, and the heating temperature is adjusted to 100°C.

[0057] The polyvinyl alcohol composite nanofiltration membrane prepared by this method has a rejection rate of 1.54% to 200ppmNaCl solution under 0.41MPA, a rejection rate of 5.8% to magnesium sulfate, a rejection rate of 90.3% to PEG600, and a rejection rate of 80.1% to PEG400. %, the flux is 78LMH.

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Abstract

The invention discloses a polyvinyl alcohol composite nanofiltration membrane preparation method. The method includes the following steps that S1, a mixed aqueous solution of polyvinyl alcohol and inorganic nanoparticles is prepared; S2, dialdehyde is provided, added into water and evenly mixed, and a dialdehyde cross-linking agent solution is prepared; S3, the mixed aqueous solution in the first step and the dialdehyde cross-linking agent solution in the second step are mixed and are coated on a polysulfone membrane, and still standing is carried out to obtain a composite membrane; S4, the composite membrane is placed for a preset period of time at a preset temperature to obtain a polyvinyl alcohol composite nanofiltration membrane. The polyvinyl alcohol composite nanofiltration membrane preparation method is simple in process and low in cost, and facilitates industrial production. Besides, the polyvinyl alcohol composite nanofiltration membrane prepared through the method can intercept small molecular substances of organic matter with the molecular weight being 400, almost all univalent and divalent inorganic salt can pass the membrane, and the membrane has high water flux.

Description

technical field [0001] The invention relates to the technical field of filter membranes, in particular to a preparation method of a polyvinyl alcohol composite nanofiltration membrane. Background technique [0002] Nanofiltration membranes are favored for their low operating pressure, high rejection rate of high-valent salts, and high rejection rate of organic matter. [0003] Similar to reverse osmosis, nanofiltration technology has become a key water purification technology with its advantages of high efficiency, environmental protection, safety, energy saving, and easy operation, and is called "the water treatment technology of the 21st century". It has a lower operating pressure and has a certain degree of selective permeability for the interception of substances in water. The composite membrane is to polymerize an ultra-thin and dense separation layer on the porous support layer. At present, the main and most widely used method for preparing nanofiltration membranes is...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D69/12B01D67/00
Inventor 陈亦力张翠苗夏建中于云李伟
Owner BEIJING ORIGIN WATER FILM TECH
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