Composite nanofiltration membrane with heavy metal interception capability

A composite nanofiltration membrane and heavy metal technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of low mechanical strength, reduced membrane usability, weak binding force, etc., to avoid swelling separation, The effect of improving mechanical strength and increasing interlayer spacing

Active Publication Date: 2020-08-28
中煤(北京)环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nanofiltration membranes are widely used in wastewater treatment because of their low energy consumption, high flux, and good retention capacity for ions and organics, but the existing single-layer nanofiltration membranes cannot meet the requirements of good retention performance and high flux ; In order to solve this problem, a composite membrane is usually obtained by a composite method. The composite method refers to a separation layer with a micro-nano pore size on the ultrafiltration or microfiltration base membrane, and it can use different materials as the base membrane and the separation layer. , but there is often a large difference in swelling between the basement membrane and the separation layer, and the weak binding force between the two causes the separation of the separation layer and the basement membrane in the later use and cleaning process and reduces the membrane. Usability; at the same time, the separation layer will significantly affect the interception performance and flux of the composite membrane, so the preparation of a separation layer with good selective screening ability plays an important role; the traditional composite method includes interfacial polymerization or surface coating method, due to the structure The dense functional layer of the nanofiltration membrane is thicker, which will reduce the flux of the nanofiltration membrane. In order to obtain a higher flux, the oper...

Method used

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  • Composite nanofiltration membrane with heavy metal interception capability
  • Composite nanofiltration membrane with heavy metal interception capability
  • Composite nanofiltration membrane with heavy metal interception capability

Examples

Experimental program
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Embodiment 1

[0036] Preparation of graphene oxide powder: adopt the Hummers method to prepare graphene oxide, specifically: add 50g sodium nitrate and 300g potassium permanganate to 100g flake graphite and stir evenly, then add 2000ml98% concentrated sulfuric acid to it under the condition of ice water bath After reacting for 2h, and then reacting at 30°C for 2h, add 4L of deionized water to the reaction system, keep it at 80°C for 30min, cool, then add 1L of 30% H 2 o 2 solution; centrifuged, and the product was acid-washed and dried to obtain graphene oxide powder for use;

[0037] Preparation of aminocucurbit[7]urea:

[0038] (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, put the solution in an environment protected by inert gas, 60~ Heating to reflux at 80°C for 12-36 hours, distilling off the toluene to obtain imidazolium salt;

[0039] (2) Add 14ml of ammonia organic solution (7m...

Embodiment 2

[0053] Preparation of nanofibrous base film

[0054] Preparation of Basement Film 1

[0055] Take 5 g of the graphene oxide powder prepared in Example 1 and disperse it in 1 L of 30 g / L tyrosine hydrochloric acid solution (the concentration of the hydrochloric acid solution is 1 mol / L), and ultrasonicate at 60° C. for 10 h; to obtain a graphene dispersion, add 50g carboxymethyl hydroxypropyl guar gum and 100g polyacrylamide; fully stir to obtain the spinning solution; inject the spinning solution into the syringe pump of the spinning device, and obtain the nanofiber membrane through electrospinning, and the nanofiber membrane is obtained from Take it off the metal substrate, soak it in boric acid and glutaraldehyde mixed solution, take it out to obtain the base film 1, and set it aside; wherein, the electrospinning voltage is 14kV, the needle diameter of the syringe pump is 1mm; the flow rate of the syringe pump is 0.1mL / h , the spinning distance is 16cm, the spinning tempera...

Embodiment 3

[0070] Preparation of Composite Nanofiltration Membrane with Heavy Metal Retention Capability

[0071] (1) Preparation of aminocucurbituril intercalated graphene oxide dispersion (same as Example 1)

[0072] (2) preparation of base film (same as embodiment 2)

[0073] (3) Deposit the aminocucurbituril intercalated graphene dispersion 1-9 obtained in the embodiment onto the base film in step (2) by vacuum filtration to obtain a composite nanofiltration membrane with heavy metal interception capacity, which is sequentially denoted as LNF- 1. LNF-2, LNF-3, LNF-4, LNF-5, LNF-6, LNF-7, LNF-8, LNF-9;

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Abstract

The invention discloses a composite nanofiltration membrane with heavy metal interception capability. The composite nanofiltration membrane is obtained by depositing amino cucurbituril intercalated graphene on a porous base membrane, wherein the base membrane is a nanofiber membrane prepared by taking graphene oxide, tyrosine, carboxymethyl hydroxypropyl guar gum and polyacrylamide as raw materials and adopting an electrostatic spinning method. The composite nanofiltration membrane has good stability and high water flux, has good interception capability on divalent/high-valent anions, heavy metal ions and anionic dyes, and is expected to be applied to treatment of heavy metal and organic dye polluted wastewater.

Description

technical field [0001] The invention belongs to the field of preparation of nanofiltration membranes, in particular to a composite nanofiltration membrane with heavy metal retention capacity. Background technique [0002] In recent years, with the development of the economy and the advancement of global industrialization, industrial wastewater contains a variety of heavy metals and organic dyes and other refractory pollutants that pose a threat to human health; the treatment of industrial wastewater has become one of the environmental problems that need to be solved urgently. 1. With the development of membrane separation technology, the use of membrane separation technology to treat wastewater pollution is popular because of its low cost and environmental friendliness; [0003] Nanofiltration membranes are widely used in wastewater treatment because of their low energy consumption, high flux, and good retention capacity for ions and organics, but the existing single-layer n...

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 中煤(北京)环保股份有限公司
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