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Preparation method of polyelectrolyte self-assembled composite nonafiltration membrane based on coordination

A technology of composite nanofiltration membrane and polyelectrolyte, which is applied in the field of preparation of polyelectrolyte self-assembled composite nanofiltration membrane, can solve the problems of decreased interception performance and easy swelling, and achieves low preparation cost, strong swelling resistance and good production environment. friendly effect

Inactive Publication Date: 2012-09-26
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, aiming to solve the problems that current self-assembled nanofiltration membranes are prone to swelling in water and lead to the decline of interception performance, and adopt the method based on cross-flow filtration to prepare self-assembled nanofiltration membranes, Provide a preparation method of polyelectrolyte self-assembled composite nanofiltration membrane based on coordination

Method used

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  • Preparation method of polyelectrolyte self-assembled composite nonafiltration membrane based on coordination
  • Preparation method of polyelectrolyte self-assembled composite nonafiltration membrane based on coordination

Examples

Experimental program
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Embodiment 1

[0026] The base membrane used in this example is a polysulfone (PS) membrane with a molecular weight cut-off of 50,000 Da (Daltons), a flat ultrafiltration membrane, and the polyanion electrolyte used is polystyrene sulfonate sodium (PSS) with a molecular weight of 70,000 Da. The polycation electrolyte is poly 4-vinylpyridine (P4VP), the molecular weight is 60000Da, and its preparation steps are as follows:

[0027] (1) Prepare a PSS solution with a mass fraction of 0.4% in deionized water, add 0.25M CuCl 2 solution, making Cu 2+ with Na in PSS solution + Exchange occurs to get PSS(Cu) 1 / 2 solution;

[0028] (2) Prepare a P4VP solution with a mass fraction of 0.2% in ethanol;

[0029] (3) Rinse and soak the PS ultrafiltration base membrane with deionized water to remove the protective solution and other impurities on the surface;

[0030] (4) Under the pressure condition of 0MPa, 0.4%PSS (Cu) 1 / 2 The solution cross-flowed through the PS ultrafiltration membrane surface f...

Embodiment 2

[0039] The base film, polycation electrolyte, and polyanion electrolyte used in this embodiment are the same as in Example 1, and the preparation steps are as follows:

[0040] (1) Prepare a PSS solution with a mass fraction of 0.4% in deionized water, add 0.25M CoCl 2 solution, making Co 2+ with Na in PSS solution + Exchange, get PSS (Co) 1 / 2 solution;

[0041] (2) Prepare a P4VP solution with a mass fraction of 0.2% in ethanol;

[0042](3) Rinse or soak the PS ultrafiltration base membrane with deionized water to remove the protective solution and other impurities on the surface;

[0043] (4) Under the pressure condition of 0MPa, 0.4%PSS(Co) 1 / 2 The solution cross-flowed through the PS ultrafiltration membrane surface for 15 minutes, and self-assembled on the surface of the ultrafiltration membrane to form a thin film of polyanion electrolyte;

[0044] (5) Rinse with deionized water to remove excess polyelectrolyte solution on the membrane surface;

[0045] (6) Under ...

Embodiment 3

[0051] The base film, polycation electrolyte, and polyanion electrolyte used in this embodiment are the same as in Example 1, and the preparation steps are as follows:

[0052] (1) Prepare a PSS solution with a mass fraction of 0.4% in deionized water, add 0.25M CuCl 2 solution, making Cu 2+ Can interact with Na in PSS solution + Exchange to get PSS (Cu) 1 / 2 solution;

[0053] (2) Prepare a P4VP solution with a mass fraction of 0.2% in ethanol;

[0054] (3) Rinse or soak the PS ultrafiltration base membrane with deionized water to remove the protective solution and other impurities on the surface;

[0055] (4) Under the pressure condition of 0.1MPa, the PSS (Cu) 1 / 2 The anionic polyelectrolyte solution cross-flowed through the surface of the ultrafiltration base membrane for 15 minutes to form a polyanionic thin-layer membrane;

[0056] (5) Rinse away excess anionic polyelectrolyte solution with deionized water;

[0057] (6) Let the cationic polyelectrolyte solution flo...

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Abstract

The invention relates to a preparation method of a polyelectrolyte self-assembled composite nonafiltration membrane based on coordination. The preparation method comprises the following steps of: respectively preparing a polyanion electrolyte solution containing transition metal ions and a polycation electrolyte solution easy to form a complex together with the transition metal ions; enabling the polyanion electrolyte solution or the polycation electrolyte solution to flow through the surface of a base membrane in a cross flow way at the pressure of 0-0.5MPa, and self-assembling on the surface of the base membrane to form a polyelectrolyte lamellar membrane; washing surplus polyelectrolyte solution on the surface of the membrane by water; enabling the polyion electrolyte solution with charges opposite to the charges of the upper-layer polyion electrolyte solution to flow through the surface of the base membrane in a cross flow way, and enabling polycation electrolyte and polyanion electrolyte to undergo self-assembled reaction on the surface of the membrane through the coordination of the metal ions to form a polyelectrolyte composite membrane; washing surplus polyelectrolyte solution on the surface of the membrane by using water; and repeating the operations to enable polyelectrolyte with opposite charges to be alternatively deposited and assembled on the surface of the base membrane to obtain the polyelectrolyte self-assembled composite nonafiltration membrane. A cross flow flowing way is adopted in the method, and thus, the phenomenon that gel is easy to form in a dead-end filtration way is avoided, and a product is high in stability, strong in impact resistance and swelling resistance, simple in process, low in preparation cost and friendly to production environment...

Description

Technical field: [0001] The invention relates to a preparation method of a polyelectrolyte self-assembled composite nanofiltration membrane based on coordination, and belongs to the technical field of separation membrane preparation. Background technique: [0002] Nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis. Nanofiltration membranes have unique charging characteristics and the performance of separating divalent ions, and will play a huge role in seawater desalination and water reuse. The research on the preparation of nanofiltration membranes is mainly based on interfacial polymerization and phase inversion methods at home and abroad. In recent years, many researchers have begun to study the construction and functionalization of layer-by-layer (LBL) films. Layer-by-layer self-assembly technology is to prepare multilayer films by alternately depositing cationic and anionic polyelectrolytes, relying on the electrostatic inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00C02F1/44
Inventor 高学理苏保卫韩姗姗
Owner OCEAN UNIV OF CHINA
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