Preparation method and application of polyethyleneimine-crosslinked graphene oxide/titanium dioxide-laminated composite film

A technology of polyethyleneimine and titanium dioxide, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as film rupture, unstable mechanical properties of graphene oxide film, and falling off of graphene oxide particles , to achieve stable separation performance, dense and clear microscopic layered structure, and complete and continuous macroscopic structure

Inactive Publication Date: 2017-08-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the graphene oxide film has good mechanical properties and stability under dry conditions, the mechanical properties of the graphene oxide film will become unstable when it is in a humid or water environment, and the graphene oxide particles are easy to decompose from the film. fall off, resulting in rupture of the film

Method used

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  • Preparation method and application of polyethyleneimine-crosslinked graphene oxide/titanium dioxide-laminated composite film
  • Preparation method and application of polyethyleneimine-crosslinked graphene oxide/titanium dioxide-laminated composite film
  • Preparation method and application of polyethyleneimine-crosslinked graphene oxide/titanium dioxide-laminated composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) One-step synthesis method to prepare graphene oxide / titanium dioxide nanocomposites

[0027] In a 250mL beaker, add 12.5mg graphene oxide, 40mL deionized water, ultrasonic 3h; add 60mg Ti(SO 4 ) 2 , the mixed solution was heated at 60°C for 24 hours, centrifuged, and washed with water; the obtained product was dispersed in 40mL of water, and 1mol / L ammonia water was added dropwise to pH=10 to obtain a stable graphene oxide / titanium dioxide dispersion.

[0028] (2) Preparation of polyethyleneimine cross-linked graphene oxide / titanium dioxide layered composite film

[0029] Stir the graphene oxide / titanium dioxide dispersion prepared in step 1 for 30 minutes, add 25 mg of polyethyleneimine, ultrasonicate for 1 hour, and use a mixed cellulose membrane with a pore size of 0.22 μm as the base membrane for the obtained colloidal solution, vacuum filter for 12 hours , treated at 0°C for 30 minutes to obtain a polyethyleneimine-crosslinked graphene oxide / titanium dioxide ...

Embodiment 2

[0034] (1) One-step synthesis method to prepare graphene oxide / titanium dioxide nanocomposites

[0035] In a 250mL beaker, add 25mg graphene oxide, 40mL deionized water, ultrasonic 3h; add 60mg Ti(SO 4 ) 2 , the mixed solution was heated at 60°C for 24 hours, centrifuged, and washed with water; the obtained product was dispersed in 40mL of water, and 1mol / L ammonia water was added dropwise to pH=10 to obtain a stable graphene oxide / titanium dioxide dispersion.

[0036] (2) Preparation of polyethyleneimine cross-linked graphene oxide / titanium dioxide layered composite film

[0037] Stir the graphene oxide / titanium dioxide dispersion prepared in step 1 for 30 minutes, add 25 mg of polyethyleneimine, ultrasonicate for 1 hour, and use a mixed cellulose membrane with a pore size of 0.22 μm as the base membrane for the obtained colloidal solution, vacuum filter for 12 hours , and treated at 50° C. for 1 h to obtain a polyethyleneimine-crosslinked graphene oxide / titanium dioxide la...

Embodiment 3

[0039] (1) One-step synthesis method to prepare graphene oxide / titanium dioxide nanocomposites

[0040] In a 250mL beaker, add 50mg graphene oxide, 40mL deionized water, ultrasonic 3h; add 60mg Ti(SO 4 ) 2 , the mixed solution was heated at 60°C for 24 hours, centrifuged, and washed with water; the obtained product was dispersed in 40mL of water, and 1mol / L ammonia water was added dropwise to pH=10 to obtain a stable graphene oxide / titanium dioxide dispersion.

[0041] (2) Preparation of polyethyleneimine cross-linked graphene oxide / titanium dioxide layered composite film

[0042] Stir the graphene oxide / titanium dioxide dispersion prepared in step 1 for 30 minutes, add 25 mg of polyethyleneimine, ultrasonicate for 1 hour, and use a mixed cellulose membrane with a pore size of 0.22 μm as the base membrane for the obtained colloidal solution, vacuum filter for 12 hours , treated at 100°C for 2 hours to obtain a polyethyleneimine-crosslinked graphene oxide / titanium dioxide lay...

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Abstract

The invention provides a preparation method and application of a polyethyleneimine-crosslinked graphene oxide / titanium dioxide-laminated composite film. The preparation method comprises the following preparation steps: taking graphene oxide, and dispersing the graphene oxide into deionized water for carrying out ultrasonic operation in a 250mL beaker to obtain graphene oxide dispersion liquid; adding Ti(SO4)2, heating a mixed solution under the condition of 60 DEG C for 24 hours, centrifuging, washing with water and drying to obtain a graphene oxide / titanium dioxide nanocomposite material; dispersing the graphene oxide / titanium dioxide nanocomposite material into water; dropwise adding ammonium hydroxide and adjusting a PH value to obtain graphene oxide / titanium dioxide dispersion liquid; then adding an amino polymer and carrying out ultrasonic dissolving; taking a mixed cellulose membrane as a base membrane in an obtained colloidal solution, and carrying out vacuum suction filtering at given temperature to obtain the polyethyleneimine-crosslinked graphene oxide / titanium dioxide-laminated composite film. In the polyethyleneimine-crosslinked graphene oxide / titanium dioxide-laminated composite film disclosed by the invention, by means of polyethyleneimine, the laminated composite film has more stable separating performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, in particular to a preparation method and application of polyethyleneimine crosslinked graphene oxide / titanium dioxide layered composite film. Background technique [0002] Dye wastewater is one of the main harmful industrial wastewater, which mainly comes from the dye and dye intermediate production industry. It is composed of the mother liquor of crystallization of various products and their intermediates, materials lost during the production process, and sewage from washing the ground. With the continuous growth of the dye industry, its production wastewater has become a major source of water pollution. Therefore, how to remove dye molecules in wastewater has always been the focus of attention and research hotspot. [0003] Membrane separation technology, a high-tech developed due to its advantages of high efficiency, low energy consumption, easy oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00C02F1/44
CPCB01D67/0079B01D71/26C02F1/44
Inventor 笪祖林孟敏佳张骥李毅李彬榕
Owner JIANGSU UNIV
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