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Graphene oxide composite membrane with pH responsiveness and preparation method and application thereof

A graphene composite, responsive technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of excellent separation performance, maintaining responsive performance, and excellent cycle performance

Inactive Publication Date: 2019-05-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no studies have been conducted to introduce the pH-responsive properties of polyethyleneimine into graphene oxide sheets.

Method used

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  • Graphene oxide composite membrane with pH responsiveness and preparation method and application thereof
  • Graphene oxide composite membrane with pH responsiveness and preparation method and application thereof
  • Graphene oxide composite membrane with pH responsiveness and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 (MB)

[0049] The pH-responsive graphene oxide composite film is realized by self-assembling graphene oxide sheets and polyethyleneimine layer by layer on the surface of the substrate. The specific structure is as follows: figure 1 shown. The specific preparation method is as follows:

[0050] (1) Add a certain amount of graphene oxide (GO) and polyvinylidene fluoride (PVDF) into dimethylacetamide (DMAc), the mass fraction of graphene oxide is controlled to be 0.2%, and the mass fraction of PVDF is 16 %, ultrasonically for one hour to disperse it.

[0051] (2) Stir the above mixture at 70° C. for 24 hours to obtain a uniformly mixed casting solution.

[0052] (3) Centrifuge the casting solution at 3000 rpm for 5 minutes to defoam, and then pass the casting solution through a scraping device to prepare a graphene oxide composite film with a thickness of 200 μm.

[0053] (4) Place the film prepared in step (3) in water, and then dry it to obtain a graphene o...

Embodiment 2

[0058] Example 2 (ML)

[0059] Compared with Example 1, the present embodiment is only different in that the branched polyethyleneimine in steps (5) and (7) is replaced by linear polyethyleneimine, and all the others are the same, and the polyethylenimine finally obtained is Ethyleneimine is a linear graphene oxide composite film, denoted as ML.

[0060] The preparation method of linear polyethyleneimine is as follows: polyethylene oxide is added to HCl solution, and the mixture is heated to 100° C. in a microwave digester for 4 hours. After the mixture was cooled to room temperature, the reaction product was collected and purified by dialysis, and finally, the purified product was freeze-dried to obtain linear polyethyleneimine.

[0061] The graphene oxide composite film of above-mentioned embodiment 1 and 2 gained is carried out infrared spectrum and XPS collection of collection of collections to detect the chemical composition of its surface, the result is as follows fig...

Embodiment 3

[0069] Embodiment 3: interception of single component organic pollutant

[0070] In order to evaluate the screening effect of graphene oxide composite membranes under different pH conditions, several representative organic pollutants were selected for separation experiments, including polyvinylpyrrolidone (PVP, molecular weight 58K), polyethylene oxide (PEO, Molecular weights of 300K and 600K) and silver nanoparticles (Ag NPs, with a size of 50 nm), the above four pollutants were stable in the pH range from 3 to 11. like Figure 9 As shown, the rejection rates of MB and ML to the above four pollutants all increased with the increase of pH. When the pH of the solution changed from 3 to 11, the retention rates of MB and ML to PVP increased from <1% to 45.5% and from 1.5% to 26.4%, respectively; the retention rates of MB and ML to PEO1 (300K) were increased from 29.6 % became 88.7% and increased from 32.6% to 81.7%; the rejection of PEO2(600K) by MB and ML increased from 56.7% ...

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Abstract

The invention discloses a graphene oxide composite membrane with pH responsiveness and a preparation method and application thereof. A graphene oxide sheet layer is crosslinked into a graphene networkthrough polycation electrolyte, and is uniformly spread on the surface of a matrix membrane, so that the morphology and performance of the graphene oxide composite membrane are adjusted. The membranehas high chemical stability and also has high permeability and filtration performance. The graphene oxide composite membrane has excellent pH response performance, and the thickness, surface hydrophilicity and hydrophobicity and pore diameter of the graphene oxide composite membrane are adjusted along with the regulation and control of external pH. According to the characteristics, the pH-responsive graphene oxide composite membrane can show selectivity to different pollutants under different pH conditions, can achieve separation and recovery of pollutants with different components, and can achieve a plurality of continuous filtration cycles. The pH-responsive graphene oxide composite membrane has extremely high stability, excellent pH responsiveness and recycling performance, and can beused in the fields of actual water body pollutant removal, multi-component pollutant separation and the like.

Description

technical field [0001] The invention relates to the technical field of novel environmental responsive materials, in particular to a pH-responsive graphene oxide composite film and its preparation method and application. technical background [0002] Environmentally responsive membrane materials can be used in the separation of substances, controlled release of drugs, and wastewater treatment. Environment-responsive porous membrane materials for separation processes, whose permeability can change with external environmental conditions, have received widespread attention. For example, by assembling poly(N-isopropylacrylamide) and graphene oxide, a thermally responsive membrane material can be prepared, and the membrane pore size can be controlled by the external temperature. However, if the feed water or membrane modules are heated from 25°C to 50°C during wastewater treatment, it will consume a very large amount of energy. In contrast, during water treatment, it is relative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/62B01D67/00B01D69/02B01D69/12B01D71/02C02F1/44C02F101/20C02F101/32C02F101/38
Inventor 陈宝梁朱小萤张丽娜
Owner ZHEJIANG UNIV
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