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Biomimetic mineralization preparation method of polyelectrolyte/calcium carbonate composite nanofiltration membrane

A composite nanofiltration membrane and polyelectrolyte technology, which is applied in the field of biomimetic mineralization preparation of polyelectrolyte/calcium carbonate composite nanofiltration membrane, can solve the problems of large particle size of calcium carbonate inorganic particles, inability to control particle size, and lack of flexibility. , to achieve good application effect, good biological functionality, and easy operation.

Inactive Publication Date: 2013-08-28
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] The patent with the publication number CN102553461A discloses an inorganic / organic composite nanofiltration membrane, in which the inorganic calcium carbonate is formed by in-situ precipitation reaction of soluble calcium salt and soluble carbonate, and the obtained composite membrane is uniform and controllable, with stable performance. However, this method can only control the dispersion uniformity of calcium carbonate, but cannot regulate its particle size, and the particle size of calcium carbonate inorganic particles obtained is relatively large; Hao Wei (Chem.Mater.2007,19,1974-1978) A carbon dioxide (CO 2 ) gas phase diffusion method to prepare artificial calcium carbonate imitation shell composite film, this film is first self-assembled layer by layer diazo resin cross-linked polyacrylic acid film (DAR / PAA) on the quartz substrate, and then, will be covered with DAR / PAA The quartz substrate is immersed in a certain concentration of CaCl 2 In solution, the adsorption of Ca 2+ After that, it is placed in a closed container containing ammonium carbonate, and the ammonium carbonate decomposes at a certain temperature, and the produced CO 2 Diffused on the surface of the quartz substrate, and the Ca on the surface of the film 2+ Mineralization reaction to obtain an artificial imitation shell composite film
The polymer layer used in this method is polyacrylic acid cross-linked by diazo resin, and the obtained calcium carbonate has a uniform particle size. its specific application in real life

Method used

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  • Biomimetic mineralization preparation method of polyelectrolyte/calcium carbonate composite nanofiltration membrane

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Embodiment 1

[0025] A biomimetic mineralization preparation method of polyelectrolyte / calcium carbonate composite nanofiltration membrane, such as figure 1 shown, including the following steps:

[0026] Step 101: immerse the base film in a 1.0-8.0 g / L cationic polyelectrolyte solution containing 0.01 mol / mL-0.1 mol / mL soluble calcium salt;

[0027] Step 102: After 10-30 minutes, rinse with deionized water;

[0028] Step 103: immerse in 1.0-8.0 g / L anionic polyelectrolyte solution;

[0029] Step 104: After 10-30 minutes, take it out and wash it thoroughly with deionized water to obtain Ca-containing 2+ Polyelectrolyte composite membrane organic matrix pre-organized layer;

[0030] Step 105: placing the obtained polyelectrolyte composite membrane organic matrix pre-organized layer in an airtight container containing decomposable carbonate powder;

[0031] Step 106: In a constant temperature environment of 30-60°C, the gas phase diffusion of carbon dioxide produced by the decomposition of...

Embodiment 2

[0034] A preparation method for biomimetic mineralization of a polyelectrolyte / calcium carbonate composite nanofiltration membrane, comprising the steps of:

[0035] Step 100: using a polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of less than 100,000 as the base membrane, treating the base membrane with 0.5 mol / L sodium hydroxide solution for 2 hours, and then washing with deionized water until neutral;

[0036] Step 101: immerse the polyacrylonitrile-based membrane treated in step 100 in 8.0 g / L PEI polyelectrolyte solution containing 0.1 mol / mL calcium acetate;

[0037] Step 102: After 10 minutes, rinse with deionized water;

[0038]Step 103: immerse in 8.0g / L PSS polyelectrolyte solution again;

[0039] Step 104: Take it out after 10 minutes, and wash it thoroughly with deionized water. Repeat the above operation once to obtain the polyelectrolyte composite membrane Ca 2+ pre-organization layer;

[0040] Step 105: the polyelectrolyte composi...

Embodiment 3

[0044] This embodiment is roughly the same as Embodiment 2, except that the following steps are added between step 100 and step 101, specifically as follows:

[0045] Immerse the polyacrylonitrile-based membrane treated in step 100 in 8.0g / L polyethyleneimine (PEI) polyelectrolyte solution, take it out after immersion for 10min, and wash it fully with deionized water; then place it in 8.0g / L polyelectrolyte solution Sodium styrene sulfonate (PSS) polyelectrolyte solution, take it out after 10min, fully wash with water, dry and set aside to obtain polyelectrolyte composite membrane;

[0046] The calcium carbonate inorganic matter in the polyelectrolyte / calcium carbonate composite film obtained by this method has a structure closer to that of the inorganic matter in living organisms (such as shells), has better biological functionality, and has a uniform structure and stable performance.

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Abstract

The invention relates to a preparation method of a composite nanofiltration membrane and especially relates to a biomimetic mineralization preparation method of a polyelectrolyte / calcium carbonate composite nanofiltration membrane. The biomimetic mineralization preparation method comprises polyelectrolyte composite membrane Ca<2+> pre-organization layer formation and polyelectrolyte composite membrane biomimetic mineralization. An inorganic precursor is subjected to interface molecule identification by the polyelectrolyte so that a pre-organization structure is formed; and a biomimetic mineralization reaction is carried out in a way of simulation of CO2 biological uptake and transformation into calcium carbonate minerals in nature. The biomimetic mineralization preparation method is a green preparation method. The polyelectrolyte / calcium carbonate composite nanofiltration membrane obtained by the biomimetic mineralization preparation method has a uniform structure and can be used for removing divalent metal ions such as Ni<2+>, Cd<2+>, Cu<2+>, Zn<2+>, Mg<2+> and Ca<2+> in waste water and has good use effects.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane, in particular to a bionic mineralization preparation method of a polyelectrolyte / calcium carbonate composite nanofiltration membrane with a shell-like structure. Background technique [0002] As a newly developed pressure-driven membrane separation process, nanofiltration membrane has been widely used in the purification and concentration of biochemical reagents, Desalination of salt water, industrial wastewater treatment, advanced treatment of drinking water and material recovery and other fields. At present, commercial nanofiltration membranes are mostly prepared by interfacial polymerization (such as patents with publication numbers CN102641667A, CN102151499A, and CN1806901A), but this method has high requirements on the base membrane and many side reactions, making it difficult to obtain ultra-thin nanofiltration membranes The layer-by-layer self-assembly method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/28B01D71/60B01D69/12B01D67/00
Inventor 郭红霞耿常乐谷新月秦振平张国俊崔素萍纪树兰
Owner BEIJING UNIV OF TECH
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