Preparation method of graphene oxide water treatment membrane capable of generating surface nanobubbles in situ

A technology of nano-bubbles and water treatment membranes, applied in chemical instruments and methods, osmosis/dialysis water/sewage treatment, membrane technology, etc., can solve the problems of large flow resistance and difficulty in achieving ideal permeability of the membrane, and achieve the improvement of permeability , Reduce fluid flow resistance, simple process effect

Active Publication Date: 2021-07-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be noted that although graphene oxide membranes have the above advantages and have shown excellent permeability in the fields of pervaporation and gas separation, they are limited by the strong interaction bet

Method used

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  • Preparation method of graphene oxide water treatment membrane capable of generating surface nanobubbles in situ
  • Preparation method of graphene oxide water treatment membrane capable of generating surface nanobubbles in situ
  • Preparation method of graphene oxide water treatment membrane capable of generating surface nanobubbles in situ

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1, prepare the graphene oxide water treatment membrane that can generate surface nano bubbles in situ, the steps are as follows:

[0023] Step 1, the preparation of graphene oxide-polyfluoroaniline composite:

[0024] 21 mg of graphene oxide was added to a mixed solution of 20 mL of isopropanol and 100 mL of 1M hydrochloric acid, and ultrasonicated for 60 min to obtain a good dispersion. Then 11.25 mM ammonium persulfate was added to the above dispersion to form an aqueous phase. Meanwhile, 7.5 mM 2-fluoroaniline was dissolved in 100 mL of dichloromethane to form an oil phase. Then the water phase was carefully poured into the oil phase, and the reaction was carried out at 0°C for 72 hours. The product was filtered, washed several times with deionized water and ethanol, and dried in vacuum at 60°C to obtain a graphene oxide-polyfluoroaniline composite. The electron microscope image of the complex is shown in image 3 shown.

[0025] Step 2. Preparation of...

Embodiment 2

[0028] Embodiment 2, preparation of geometry-chemical double heterogeneous graphene oxide water treatment membrane, its preparation process is basically the same as embodiment 1, the only difference is: in step 1, the concentration of ammonium persulfate is changed from 11.25mM to 1.5mM, 2 -The concentration of fluoroaniline was changed from 7.5mM to 1.0mM, and the geometric-chemical double heterogeneous graphene oxide water treatment membrane was finally prepared.

[0029] The pure water flux of the geometric-chemical double heterogeneous graphene oxide water treatment membrane made in embodiment 2 is 14.24±4.3L / (m 2 h), the rejection rate of corn oil / water emulsion (mass fraction of corn oil is 0.1%) is 99.1±0.9%.

Embodiment 3

[0030]Embodiment 3, preparation of geometry-chemical double heterogeneous graphene oxide water treatment membrane, its preparation process is basically the same as embodiment 1, the only difference is: in step 1, the concentration of ammonium persulfate is changed from 11.25mM to 3.75mM, 2 -The concentration of fluoroaniline was changed from 7.5mM to 2.5mM, and finally a geometric-chemical double heterogeneous graphene oxide water treatment membrane was prepared.

[0031] The pure water flux of the geometric-chemical double heterogeneous graphene oxide water treatment membrane prepared in Example 3 is 938.81±33L / (m 2 h), the rejection rate of corn oil / water emulsion (mass fraction of corn oil is 0.1%) is 98.1±1.9%.

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Abstract

The invention discloses a preparation method of a graphene oxide water treatment membrane capable of generating surface nanobubbles in situ. The preparation method comprises the following steps of growing a polymer nano array on the surface of graphene oxide in situ by adopting an oxidative polymerization method to prepare a compound, dispersing the compound in a solvent to obtain dispersion liquid, and carrying out vacuum filtration on the surface of the microfiltration membrane to form a membrane, carrying out heat treatment, enabling the hydrophobic polymer nano array to shrink from swelling, and enabling the nanosheets to generate wrinkles by virtue of strong cohesion, so as to obtain the graphene oxide water treatment membrane capable of generating surface nanobubbles in situ. The membrane is prepared by adopting vacuum filtration and heat treatment methods, and the process is simple; the membrane is immersed in water, gas in the water can be enriched on the surface of the membrane to form surface nanobubbles by the hydrophobic region, the stable existence of the surface nanobubbles can be maintained by the hydrophilic region and the geometric fold structure, the physical and chemical characteristics of the wall surface of a membrane pore channel are changed by the generation of the surface nanobubbles, and a solid-liquid interface part is converted into a low-friction gas-liquid interface; the fluid flow resistance is obviously reduced, and the membrane permeability is effectively improved.

Description

technical field [0001] The invention relates to the technical field of water treatment membrane preparation, in particular to a method for preparing a graphene oxide water treatment membrane capable of generating surface nanobubbles in situ. Background technique [0002] The scarcity of water resources and the intensification of water pollution have become two major challenges restricting the high-quality development of human society in the 21st century. Therefore, efficient water treatment technology has become a major demand. As a green separation technology, membrane separation technology has developed rapidly in recent years. Membrane separation technology is a separation technology that separates, concentrates and purifies a mixed system under the action of an external driving force. It has been widely used in seawater desalination, brackish water desalination, industrial wastewater and domestic sewage advanced treatment and recycling. and other fields. [0003] Membr...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D69/02B01D71/60C02F1/44
CPCB01D71/021B01D71/60B01D69/02B01D67/0079C02F1/44Y02A20/131
Inventor 姜忠义马宇张润楠
Owner TIANJIN UNIV
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