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Hybrid composite membrane based on polydopamine functionalized graphene and preparation and application

A technology of polydopamine and functionalization, applied in chemical instruments and methods, membrane technology, petroleum industry, etc., can solve the problems of reduced swelling resistance and defects, and achieve reduced swelling, low cost, and simple and controllable preparation process Effect

Active Publication Date: 2016-07-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lack of groups on the surface of graphene that can form a strong interaction with the polymer matrix will cause defects in the interface between the polymer matrix and the filler (referred to as the hybrid interface), which will reduce the anti-swelling ability of the film.

Method used

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  • Hybrid composite membrane based on polydopamine functionalized graphene and preparation and application
  • Hybrid composite membrane based on polydopamine functionalized graphene and preparation and application
  • Hybrid composite membrane based on polydopamine functionalized graphene and preparation and application

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: prepare the composite membrane of 2% of filling amount (being the mass ratio of graphene composition and matrix in filler), comprise the following steps:

[0021] Step 1, preparation of functionalized graphene: disperse graphene oxide nanosheets in deionized water, the amount of graphene oxide used is determined according to the required ratio according to the quality of Pebax used in the subsequent steps, and the ratio is 2%. Become the suspension liquid of concentration 0.3g / L, ultrasonic dispersion 15min; Dissolve trometamol (trade name Trizma base) in deionized water and be made into the solution of 0.04mol / L; Said suspension liquid and solution equivolume Mix and adjust the pH of the mixture to 10 with hydrochloric acid. Add dopamine hydrochloride with the same mass as the aforementioned graphene oxide, and after dissolving, ultrasonically disperse for 15 minutes in an ice bath (the temperature is kept below 10°C); stir vigorously in a water bath preh...

Embodiment 2

[0025] Embodiment 2: prepare the composite film of filling amount 6%, comprise the following steps:

[0026]Step 1, preparation of functionalized graphene: disperse graphene oxide nanosheets in deionized water, the amount of graphene oxide used is determined according to the required ratio according to the quality of Pebax used in the subsequent steps, and the ratio is 6%. into a suspension with a concentration of 0.5g / L, and ultrasonically disperse for 10 minutes; dissolve Trizma base in deionized water to form a 0.02mol / L solution; mix the suspension with equal volumes of the solution, and dissolve The pH was adjusted to 8.5. Add dopamine hydrochloride with the same mass as the aforementioned graphene oxide, and after dissolving, ultrasonically disperse for 10 minutes in an ice bath (the temperature is kept below 10°C); stir vigorously in a water bath preheated to 60°C, and at a speed of 10000r / min Centrifuge under the conditions to obtain a precipitate, wash with deionized...

Embodiment 3

[0030] Embodiment 3: prepare the composite film of filling amount 8%, comprise the following steps:

[0031] Step 1, preparation of functionalized graphene: disperse graphene oxide nanosheets in deionized water, the amount of graphene oxide used is determined according to the required ratio according to the quality of Pebax used in the subsequent steps, and the ratio is 8%. into a suspension with a concentration of 0.6g / L, and ultrasonically dispersed for 30 minutes; Trizma base was dissolved in deionized water to form a 0.01mol / L solution; The pH was adjusted to 8. Add dopamine hydrochloride with the same mass as the aforementioned graphene oxide, and after dissolving, ultrasonically disperse for 30 minutes in an ice bath (the temperature is kept below 10°C); stir vigorously in a water bath preheated to 55°C, at a speed of 9500r / min Centrifuge under the conditions to obtain a precipitate, wash with deionized water and then with absolute ethanol, and dry under vacuum at 20°C;...

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Abstract

The invention discloses a method for functionalizing a graphene oxide nanosheet and application of a hybrid composite membrane constructed on the basis of the method. When dopamine is subjected to oxidation self-polymerization, oxygen-containing groups on the surface of graphene oxide are subjected to reduction, and the swelling resistance of the hybrid membrane is improved. The thickness of the membrane is about 6 micrometers, the membrane is composed of a polyether-polyamide block copolymer matrix and functionalized graphene filler, and the mass fraction of the graphene component in the filler ranges from 2% to 8%. The preparation process comprises the steps that polydopamine is subjected to oxidation self-polymerization on the surface of the graphene oxide nanosheet, graphene oxide is subjected to reduction, a functionalized graphene nanosheet is obtained, the polyether-polyamide block copolymer matrix is filled with the functionalized graphene nanosheet, the surface of a polysulfone ultrafiltration membrane supporting layer is subjected to spin coating with the functionalized graphene nanosheet, and the composite membrane is obtained. The preparation process of the composite membrane is simple, convenient and controllable, the obtained membrane is applied to the pervaporation oil product desulfurizing process, and high separating property and swelling resistance are both achieved.

Description

technical field [0001] The invention relates to a membrane and its preparation and application, and belongs to the technical field of membrane separation, specifically, to the field of polymer-organic composite membranes. Background technique [0002] The separation of liquid mixtures is usually achieved by rectification, which is a mature technology with good reliability and wide application. However, rectification technology has insurmountable disadvantages, that is, high energy consumption, and it is difficult to deal with azeotropic, near-boiling systems and systems with widely different component contents. Membrane separation technology can better solve the above problems. It has the advantages of high efficiency, energy saving, green and environmental protection, and has a good development prospect. In membrane separation technology, the membrane is the core. Membranes can be divided into organic membranes and inorganic membranes according to their materials. Inorga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D69/12B01D67/00C10G31/09
CPCB01D67/0079B01D69/12B01D71/80C10G31/09C10G2300/202
Inventor 姜忠义于胜楠杨森潘福生杨冬丁鹤
Owner TIANJIN UNIV
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