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Composite nanofiltration membrane adopting tannic acid-titanium as isolation layer and preparation method of composite nanofiltration membrane

A composite nanofiltration membrane and tannic acid technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of environmental and biological harm, low membrane permeability, high operating pressure, etc. Friendly, stable surface structure, easy to operate

Inactive Publication Date: 2018-11-23
XIAMEN UNIV OF TECH
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  • Summary
  • 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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  • Composite nanofiltration membrane adopting tannic acid-titanium as isolation layer and preparation method of composite nanofiltration membrane

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preparation example Construction

[0014] The embodiment of the present invention proposes a preparation method of a composite nanofiltration membrane using tannic acid-titanium as a separation layer, comprising the following steps:

[0015] S1, immersing the basement membrane in an aqueous solution containing tannic acid;

[0016] S2, adding a metal titanium salt to in-situ generate a tannic acid-titanium cross-linked functional surface layer on the base membrane to obtain a composite nanofiltration membrane.

[0017] Further, in a preferred embodiment of the present invention, the base membrane is selected from one of polysulfone porous membrane, polyethersulfone porous membrane, polyacrylonitrile porous membrane and polyvinylidene fluoride porous membrane. The adhesiveness of the functional groups of tannic acid makes it suitable for a variety of basement membranes.

[0018] Further, in a preferred embodiment of the present invention, the concentration of tannic acid in the aqueous tannic acid solution is 0...

Embodiment 1

[0025] First, the polysulfone-based membrane is directly immersed in an aqueous solution containing 10.5mmol / L tannic acid; 10.5mmol / L titanium tetrachloride is added (that is, the molar ratio of tannic acid / titanium salt is 1 / 1), and the reaction is carried out at room temperature. After 9 hours, the tannic acid-titanium functional surface layer was finally deposited in situ on the polysulfone base membrane to obtain a composite nanofiltration membrane. After rinsing several times with deionized water, the prepared composite membrane was kept in water.

Embodiment 2

[0027] Example 2 is basically the same as Example 1, except that the reaction time is 1 h.

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Abstract

The invention provides a composite nanofiltration membrane adopting tannic acid-titanium as an isolation layer and a preparation method of the composite nanofiltration membrane, which relates to the technical field of membranes. The preparation method of the composite nanofiltration membrane adopting tannic acid-titanium as the isolation layer comprises the following steps: soaking a basic membrane in an aqueous solution containing tannic acid; and adding a metal titanium salt, in-situ growing a tannic acid-titanium cross-linked functional surface layer on the basic film, and obtaining the composite nanofiltration membrane. The preparation method is simple in operation, mild in conditions, low in cost, and environmentally friendly. The composite nanofiltration membrane adopting the tannicacid-titanium as the isolation layer is prepared by adopting the method. The composite nanofiltration membrane has excellent isolation function, anti-pollution performance and antibacterial activity.

Description

technical field [0001] The invention relates to the field of membrane technology, and in particular to a composite nanofiltration membrane with tannic acid-titanium 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 nano-scale pore diameter is generally compounded on a porous support base film. 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 the most common me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/12B01D69/02B01D67/00C02F1/44C02F101/34C02F101/36C02F101/38C02F103/30
CPCB01D61/027B01D67/0079B01D69/02B01D69/12B01D71/06B01D2325/30B01D2325/36C02F1/442C02F2101/34C02F2101/36C02F2101/38C02F2101/40C02F2103/30
Inventor 吴慧青谢琳郑心月毛龙刘跃军
Owner XIAMEN UNIV OF TECH
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