Charged TiO2/polyelectrolyte composite nanofiltration membrane as well as preparation method and application thereof

A technology of composite nanofiltration membrane and polyelectrolyte, which is applied in the field of charged TiO2/polyelectrolyte composite nanofiltration membrane, can solve the problems of difficulty in obtaining nanofiltration membrane, high requirements for base membrane, and many side reactions, and achieve good photocatalytic performance , Composite membrane structure is uniform, the effect of easy operation

Active Publication Date: 2015-07-22
中科瑞阳膜技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of nanofiltration membranes is mostly to cover a very thin selective separation layer on the surface of the base membrane with better strength and larger flux. The preparation methods mainly include coating method and phase inversion method (such as patent CN 102091539A ), interfacial polymerization (such as patent CN 101254419 A, CN 101559334 A), etc., surface grafting method (such as pat

Method used

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  • Charged TiO2/polyelectrolyte composite nanofiltration membrane as well as preparation method and application thereof
  • Charged TiO2/polyelectrolyte composite nanofiltration membrane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Pretreat the base membrane to make its surface negatively charged: take the ultrafiltration membrane as the base membrane, use 1.0mol / L sodium hydroxide solution to treat the base membrane at 30°C for 30min, and then use deionized Rinse with water until the pH value is 7;

[0026] (2) Preparation of polyelectrolyte solution: Dissolve cationic polyelectrolyte polyetherimide (PEI) and anionic polyelectrolyte sodium polystyrene sulfonate (PSS) in deionized water respectively, and prepare a solution with a solubility of 5.0 g / L Polyetherimide (PEI) solution and polystyrene sulfonate sodium (PSS) solution, and the modified negatively charged PSS-TiO 2 Added to polystyrene sulfonate sodium (PSS) film-making liquid, prepared 0.2g / L nanoparticle PSS-TiO 2 Sodium polystyrene sulfonate (PSS) membrane solution, magnetically stirred for 4h;

[0027] (3) Self-assembled base layer: soak the negatively charged base film treated in step (1) in the polyetherimide (PEI) solution pr...

Embodiment 2

[0032] (1) Pretreat the base membrane to make its surface negatively charged: take the ultrafiltration membrane as the base membrane, use 1.0mol / L sodium hydroxide solution to treat the base membrane at 30°C for 30min, and then use deionized Rinse with water until the pH value is 7;

[0033] (2) Preparation of polyelectrolyte solution: Dissolve cationic polyelectrolyte polyetherimide (PEI) and anionic polyelectrolyte sodium polystyrene sulfonate (PSS) in deionized water respectively, and prepare a solution with a solubility of 5.0 g / L Polyetherimide (PEI) solution and polystyrene sulfonate sodium (PSS) solution, and the modified negatively charged PSS-TiO 2 Added to polystyrene sulfonate sodium (PSS) film-making liquid, prepared 0.2g / L nanoparticle PSS-TiO 2 Sodium polystyrene sulfonate (PSS) membrane solution, magnetically stirred for 2h;

[0034] (3) Self-assembled base layer: soak the negatively charged base film treated in step (1) in the polyetherimide (PEI) solution pr...

Embodiment 3

[0040] (1) Pretreat the base membrane to make its surface negatively charged: take the ultrafiltration membrane as the base membrane, use 2.0mol / L sodium hydroxide solution to treat the base membrane at 30°C for 30min, and then use deionized Rinse with water until the pH value is 7;

[0041] (2) Preparation of polyelectrolyte solution: Dissolve cationic polyelectrolyte polyetherimide (PEI) and anionic polyelectrolyte sodium polystyrene sulfonate (PSS) in deionized water respectively, and prepare a solution with a solubility of 5.0 g / L Polyetherimide (PEI) solution and polystyrene sulfonate sodium (PSS) solution, and the modified positively charged PEI-TiO 2 Added to the polyetherimide (PEI) film-making solution to prepare 0.12g / L nanoparticle PEI-TiO 2 Polyetherimide (PEI) film-making liquid, magnetically stirred for 4h;

[0042] (3) Self-assembled base layer: soak the negatively charged base film treated in step (1) in the polyetherimide (PEI) solution prepared in step (2) ...

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Abstract

The invention discloses a charged TiO2/polyelectrolyte composite nanofiltration membrane as well as a preparation method and an application thereof, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: firstly, the surface of a base membrane is charged, so that the base membrane and polyelectrolytes can conveniently generate an electrostatic effect; secondly, the composite nanofiltration membrane is prepared with a method for alternatively depositing anionic and cationic polyelectrolytes and performing electrostatic layer-by-layer self-assembly. Inorganic nanoparticles adopted in the preparation method are modified negatively charged/positively charged TiO2 nanoparticles; as TiO2 has the advantages of good photocatalytic performance, good hydrophilicity and the like, TiO2 is combined with layer-by-layer self-assembly to prepare the TiO2/polyelectrolyte composite nanofiltration membrane; the preparation method is simple and convenient to operate and is an environment-friendly preparation method; moreover, the prepared TiO2-containing composite nanofiltration membrane has very good hydrophilicity and charge performance, has good pollution resistance, is uniform in structure and can be used for removing divalent metal ions such as Ni<2+> and the like in wastewater as well as dye molecules such as dimethylphenol orange, eriochrome black T and the like at the same time, thereby having a good application effect.

Description

technical field [0001] The invention belongs to the technical field of membrane separation and relates to a charged TiO 2 / Polyelectrolyte composite nanofiltration membrane, preparation method and application. Background technique [0002] Nanofiltration (NF) membrane is a pressure-driven membrane between ultrafiltration (UF) membrane and reverse osmosis (RO) membrane, which was developed in the early 1980s. Due to its special charging performance and membrane pore size distribution, nanofiltration membranes play an irreplaceable role in the fields of food processing, biopharmaceuticals, petrochemicals, and wastewater treatment. At present, the preparation of nanofiltration membranes is mostly to cover a very thin selective separation layer on the surface of the base membrane with better strength and larger flux. The preparation methods mainly include coating method and phase inversion method (such as patent CN 102091539A ), interfacial polymerization (such as patent CN 10...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D71/06B01D69/12B01D69/02B01D67/00
Inventor 秦振平任晓燕郭红霞李叶张国俊王乃鑫纪树兰
Owner 中科瑞阳膜技术(北京)有限公司
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