Gradient functional organic-inorganic hybrid membrane for advanced treatment of water, and preparation method thereof

A technology of gradient function and advanced treatment, applied in the field of membrane materials, can solve the problems of serious aggregation of nanoparticles and damage to the mechanical properties of membranes, and achieve the effect of improving water flux, improving size uniformity, and improving distribution and dispersion problems.

Active Publication Date: 2019-07-12
河南省驻马店水文水资源勘测局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in most cases, with the addition of a large number of nanoparticles, there will often be serious aggregation of nanoparticles inside the membrane, which will destroy the mechanical properties of the membrane.

Method used

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  • Gradient functional organic-inorganic hybrid membrane for advanced treatment of water, and preparation method thereof
  • Gradient functional organic-inorganic hybrid membrane for advanced treatment of water, and preparation method thereof
  • Gradient functional organic-inorganic hybrid membrane for advanced treatment of water, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] A gradient functional organic-inorganic hybrid membrane for advanced water treatment and a preparation method thereof, comprising the following steps:

[0030] S1. Preparation of casting solution: ultrasonically disperse the magnetic nanoparticles modified by interfacial polymerization in N-methylpyrrolidone, then add polyethylene glycol (400), polyethylene glycol (20000) and polyvinylidene fluoride to fully Mixing, stirring, heating, static defoaming to obtain a uniform casting solution;

[0031] The casting solution is made of the following raw materials according to mass percentage: 75% of N-methylpyrrolidone, 0.01% of magnetic nanoparticles modified by interfacial polymerization, 6% of polyethylene glycol (400), polyethylene glycol (20000) 4% and PVDF 14.99%.

[0032] The interfacial polymerization modified magnetic nanoparticles are polyamide interfacial polymerization modified magnetic sepiolite, magnetic halloysite and magnetic graphene oxide with a mass ratio o...

Embodiment 2

[0046] A gradient functional organic-inorganic hybrid membrane for water advanced treatment, and its preparation method comprises the following steps:

[0047] S1.. Preparation of casting solution: ultrasonically disperse interfacial polymerization modified magnetic nanoparticles in N-methylpyrrolidone, then add polyethylene glycol (400), polyethylene glycol (20000) and polyvinylidene fluoride Thoroughly mix, stir, heat, and stand still to defoam to obtain a uniform casting solution;

[0048] The casting solution is made of the following raw materials according to mass percentage: 75% of N-methylpyrrolidone, 0.5% of magnetic nanoparticles modified by interfacial polymerization, 6% of polyethylene glycol (400), polyethylene glycol (20000) 4% and PVDF 14.5%.

[0049] The interfacial polymerization modified magnetic nanoparticles are polyamide interfacial polymerization modified magnetic sepiolite, magnetic halloysite and magnetic graphene oxide with a mass ratio of 6:4:4.

[0...

Embodiment 3

[0052] A gradient functional organic-inorganic hybrid membrane for water advanced treatment, and its preparation method comprises the following steps:

[0053] S1.. Preparation of casting solution: ultrasonically disperse interfacial polymerization modified magnetic nanoparticles in N-methylpyrrolidone, then add polyethylene glycol (400), polyethylene glycol (20000) and polyvinylidene fluoride Thoroughly mix, stir, heat, and stand still to defoam to obtain a uniform casting solution;

[0054] The casting solution is made of the following raw materials according to mass percentage: 75% of N-methylpyrrolidone, 1% of magnetic nanoparticles modified by interfacial polymerization, 6% of polyethylene glycol (400), polyethylene glycol (20000) 4% and PVDF 14%.

[0055] The interfacial polymerization modified magnetic nanoparticles are polyamide interfacial polymerization modified magnetic sepiolite, magnetic halloysite and magnetic graphene oxide with a mass ratio of 6:4:4.

[0056]...

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Abstract

The invention provides a gradient functional organic-inorganic hybrid membrane for advanced treatment of water, and a preparation method thereof. The preparation method comprises the following steps:S1, preparing a membrane casting solution, wherein the membrane casting solution is prepared from, by mass, 70-80% of N-methylpyrrolidone, 0.01-5% of interfacial polymerization-modified magnetic nanoparticles, 5-8% of polyethylene glycol (400), 2-6% of polyethylene glycol (20000) and 10-20% of polyvinylidene fluoride; and S2, preparing the membrane: uniformly coating a stainless steel plate with the membrane casting solution under the action of an external magnetic field, pre-evaporating the solution, and shaping the pre-evaporated solution a coagulation bath to form the PVDF organic-inorganichybrid membrane with the nanoparticles distributed on the cross section of the membrane in a gradient manner. The preparation method significantly increases the water throughout, the fracture strength and the toughness of the hybrid membrane.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a gradient functional organic-inorganic hybrid membrane for advanced water treatment and a preparation method thereof. Background technique [0002] Membrane separation technology, as an emerging high-efficiency separation technology, is widely used in chemical engineering, environmental protection, light industry textiles, petroleum processing, biomedicine, energy engineering, etc. Among them, polyvinylidene fluoride (PVDF) membrane has become one of the most popular membrane materials. This is mainly due to the fact that PVDF, as a new type of fluorocarbon thermoplastic material with excellent weather resistance and chemical stability, will not become brittle or cracked after being placed outdoors at room temperature for 20 years. [0003] The preparation of PVDF organic-inorganic hybrid membranes mainly adopts the precipitation phase inversion method, and membrane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D71/82B01D71/02B01D69/02B01D67/00B01D71/58
CPCB01D67/0079B01D69/02B01D71/02B01D71/58B01D71/76B01D71/82B01D2325/24B01D2325/46
Inventor 邱小如邓清漪徐文霞王洪震孙金玺刘国强张蕊徐君可林伟
Owner 河南省驻马店水文水资源勘测局
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