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Phytic acid-metal ion complex composite nano-filtration membrane and preparation method thereof

A composite nanofiltration membrane and metal ion technology, which is applied in the field of phytic acid-metal ion complex composite nanofiltration membrane and its preparation, can solve the problems of environmental and biological harm, low membrane permeability, and high operating pressure. Achieve the effects of good binding stability, high retention rate and easy operation

Active Publication Date: 2018-10-19
XIAMEN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems, for example, the small monomer molecules and organic solvents used are harmful to the environment and organisms, are easily polluted during use, and the membrane has low permeability and high operating pressure and high energy consumption.

Method used

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  • Phytic acid-metal ion complex composite nano-filtration membrane and preparation method thereof
  • Phytic acid-metal ion complex composite nano-filtration membrane and preparation method thereof
  • Phytic acid-metal ion complex composite nano-filtration membrane and preparation method thereof

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preparation example Construction

[0017] The present invention proposes a kind of preparation method using phytic acid-metal ion complex as the composite nanofiltration membrane of separating layer, comprises the following steps:

[0018] S1, performing surface pretreatment on the porous support membrane;

[0019] S2, immersing the porous support membrane in an aqueous solution containing phytic acid to react for a period of time;

[0020] S3, then immersing the porous support membrane in an aqueous solution containing a metal salt to react for a period of time, depositing in situ on the porous support membrane to form a cross-linked functional surface layer of a phytic acid-metal ion complex to obtain a composite nanofiltration membrane.

[0021] Further, in a preferred embodiment of the present invention, the porous support membrane is selected from one of polyacrylonitrile porous membrane, polysulfone porous membrane, polyethersulfone porous membrane and polyvinylidene fluoride porous membrane.

[0022] Fu...

Embodiment 1

[0030] First, immerse the polysulfone porous support membrane in a 2mol / L sodium hydroxide aqueous solution, treat it at 50°C for 1 hour, take it out and wash it; then directly immerse the modified polysulfone porous support membrane in an aqueous solution containing 20mmol / L phytic acid for 30min; take it out Blow dry, then immerse in 20mmol / L ferric chloride solution, react at room temperature for 5 minutes, and finally deposit in situ on the polysulfone porous support membrane to form a functional surface layer of phytic acid-metal ion complex to obtain a composite nanofiltration membrane. After rinsing several times with deionized water, the prepared composite membrane was kept in water.

Embodiment 2

[0032] Embodiment 2 is basically the same as Embodiment 1, except that the concentration of ferric chloride solution is 5 mmol / L.

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Abstract

The invention provides a composite nano-filtration membrane using a phytic acid-metal ion complex as a separation layer, and a preparation method thereof, and relates to the field of membrane technologies. First, the surface of a polymer porous support membrane is pretreated, and then a phytic acid-metal ion complex functional surface layer is deposited on the modified porous support membrane by one step. The surface layer has a strong chemical force with the porous support membrane, is uniform and stable in structure, and has very high hydrophilicity. The prepared composite nano-filtration membrane has excellent separation function, anti-pollution performance and long-term use stability. The preparation method provided by the invention is simple and convenient to operate, mild in condition, low in cost and environmentally friendly, and has prospects in industrial production and commercial application.

Description

technical field [0001] The invention relates to the field of membrane technology, and in particular to a composite nanofiltration membrane with a phytic acid-metal ion complex as a separation layer and a preparation method thereof. Background technique [0002] The preparation and performance optimization of high-performance nanofiltration membranes are the core of nanofiltration membrane separation technology. The composite method is currently the most widely used and most effective method for preparing nanofiltration membranes. In this method, a layer of ultra-thin surface layer with nanometer pore size is compounded on a porous supporting porous supporting membrane. Since the surface layer and the support layer can be made of different materials, the appropriate surface layer and support layer can be selected respectively to optimize performance in terms of selectivity, permeability, chemical and thermal stability. At present, the interfacial polymerization method is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/12B01D67/00B01D61/02C02F1/44C02F101/30
CPCB01D61/027B01D67/0079B01D69/12B01D71/06C02F1/442C02F2101/308
Inventor 吴慧青余延锋曾丽萍许航宇毛龙刘跃军
Owner XIAMEN UNIV OF TECH
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