Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and base membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of consuming large organic solvents, reducing nanofiltration membranes, low mechanical strength, etc. Dispersibility, improve interlayer structure, avoid swelling separation effect

Active Publication Date: 2020-08-28
东莞市逸轩环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing single-layer nanofiltration membranes cannot meet the requirements of good retention performance and high water flux; in order to solve this problem, composite membranes are usually obtained by a composite method, which refers to coating ultrafiltration or microfiltration base membranes One layer of separation layer with micro-nano pore size, which can use different materials as the base membrane and separation layer, but there is often a large difference in swelling degree between the base membrane and the separation layer, and the binding force between the two Weaker will cause the separation layer and the base membrane to separate during the later use and cleaning process and reduce the usability of the membrane; at the same time, the separation layer will significantly affect the interception performance and flux of the composite membrane, so the preparation has good selective screening ability The separation layer plays an important role; the traditional composite method includes interfacial polymerization method or surface coating method, because the dense functional layer of the structure is thicker, it will reduce the flux of the nanofiltration membrane, and to obtain a higher flux, it must Increasing the operating

Method used

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  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
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[0036] Example 1

[0037] The preparation of graphene oxide powder: the Hummers method is used to prepare graphene oxide, specifically: add 50g of sodium nitrate to 100g of flake graphite, 300g of potassium permanganate and stir well, then add 2000ml of 98% concentrated sulfuric acid to it in an ice-water bath. After reacting for 2h, and then reacting at 30℃ for 2h, add 4L of deionized water to the reaction system, keep it at 80℃ for 30min, cool it, and then add 1L of 30% H 2 O 2 Solution; centrifugal separation, the product is pickled and dried to obtain graphene oxide powder, ready for use;

[0038] Preparation of aminocucurbit[7]urea:

[0039] (1) Dissolve 1.4g cucurbituril [7] in 40ml of toluene solvent, add acid chloride solution, the molar ratio of CB[7] to acid chloride solution is 1:14, and place the solution under an inert gas protection environment, 60~ Heat to reflux at 80°C for 12~36h, distill off toluene to obtain imidazole salt;

[0040] (2) Add 14ml of ammonia organic ...

Example Embodiment

[0050] Example 2

[0051] Preparation of base film 1

[0052] Take 1g of the graphene oxide powder prepared in Example 1 and disperse it in 100g of a 20wt% ethanol dispersion of resveratrol and sonicate it at 60°C for 10h; to obtain a graphene dispersion, add 900g of carboxymethyl hydroxypropyl guarana to it Aqueous solution of gum and polyethyleneimine (both the concentration of carboxymethyl hydroxypropyl guar gum and polyethyleneimine is 11.2wt%); stir evenly to obtain spinning solution; fill the spinning solution into the injection pump of the spinning device In, the nanofiber membrane is obtained by electrospinning, and the nanofiber membrane is removed from the metal substrate, soaked in boric acid solution, and then taken out to obtain the base membrane 1 for use; where the electrospinning voltage is 18kV, and the needle diameter of the syringe pump The flow rate of the syringe pump is 0.1mL / h, the spinning distance is 18cm, the spinning temperature is 30℃, and the relative...

Example Embodiment

[0062] Example 3

[0063] Preparation of composite nanofiltration membrane

[0064] Using a vacuum filtration method, deposit the semicucurbituril intercalated graphene dispersions 1-9 prepared in Example 1 onto the base membrane 3 prepared in Example 2 to obtain a composite nanofiltration membrane, which is sequentially denoted as CNF-1, CNF -2, CNF-3, CNF-4, CNF-5, CNF-6, CNF-7, CNF-8, CNF-9;

[0065] Different cucurbituril intercalated graphene dispersions were used as the deposition layer, combined with different base membranes to obtain composite nanofiltration membranes (denoted as CNF) as shown in Table 2;

[0066] Table 2

[0067] Numbering Sedimentary layer Basement membrane CNF-1 Dispersion 1 Basement membrane 3 CNF-2 Dispersion 2 Basement membrane 3 CNF-3 Dispersion 3 Basement membrane 3 CNF-4 Dispersion 4 Basement membrane 3 CNF-5 Dispersion 5 Basement membrane 3 CNF-6 Dispersion 6 Basement membrane 3 CNF-7 Dispersion 7 Basement membrane 3 CNF-8 Dispersion 8 Ba...

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Abstract

The invention discloses a composite nanofiltration membrane which is obtained by taking a nanofiber membrane prepared from graphene oxide, resveratrol, carboxymethyl hydroxypropyl guar gum and polyethyleneimine as raw materials by adopting an electrostatic spinning method as a base membrane and depositing cucurbituril intercalated graphene on the surface of the nanofiber membrane. According to thecucurbituril intercalated graphene, the resveratrol is used as a co-solution intercalating agent and a reducing agent, so that the distribution of cucurbituril among graphene layers is effectively improved, the interlayer distance of graphene is remarkably increased through cucurbituril intercalation, and the separation capacity of a deposited graphene membrane is effectively improved; the composite nanofiltration membrane has good stability, high organic matter rejection rate and high water flux.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane preparation, and in particular relates to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology has the advantages of high efficiency, simple equipment, convenient operation, energy saving and environmental protection, etc. The separation performance of nanofiltration membrane is between reverse osmosis membrane and ultrafiltration membrane, because of its low energy consumption, high flux and the The good interception capacity is widely used in wastewater treatment, seawater desalination and material separation and purification and other fields. [0003] Existing single-layer nanofiltration membranes cannot meet the requirements of good retention performance and high water flux; in order to solve this problem, composite membranes are usually obtained by a composite method, which refers to coating ultrafiltration or...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00
CPCB01D69/12B01D67/0079
Inventor 杨晓飞
Owner 东莞市逸轩环保科技有限公司
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