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A gradient functional organic-inorganic hybrid membrane for advanced water treatment and its preparation method

A gradient function and advanced treatment technology, applied in the field of membrane materials, can solve the problems of severe aggregation of nanoparticles and damage to the mechanical properties of the membrane, and achieve the effects of improving water flux, increasing interaction, and improving size uniformity

Active Publication Date: 2021-08-31
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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  • A gradient functional organic-inorganic hybrid membrane for advanced water treatment and its preparation method
  • A gradient functional organic-inorganic hybrid membrane for advanced water treatment and its preparation method
  • A gradient functional organic-inorganic hybrid membrane for advanced water treatment and its preparation method

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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 present invention provides a gradient functional organic-inorganic hybrid membrane for advanced water treatment and a preparation method thereof, comprising the following steps: S1. Preparation of casting solution: the casting solution is calculated by mass percentage, and its composition Made from the following raw materials: 70-80% of N-methylpyrrolidone, 0.01-5% of magnetic nanoparticles modified by interfacial polymerization, 5-8% of polyethylene glycol (400), 2-8% of polyethylene glycol (20000) 6% and polyvinylidene fluoride 10-20%; S2. Membrane production: under the action of an external magnetic field, the casting solution is evenly coated on a stainless steel plate, and after pre-evaporation, it enters a coagulation bath to form a nano The PVDF organic membrane-inorganic hybrid membrane with gradient distribution of particles in the membrane section can significantly improve the water flux, fracture strength and 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 Patents(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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