Preparation method of graphene foam-polydopamine composite membrane, product prepared with preparation method and application of product

Abstract

The invention discloses a preparation method of a graphene foam-polydopamine composite membrane, a product prepared with the preparation method and an application of the product. The preparation method comprises steps as follows: (1) preparation of graphene foam-polydopamine: the pH value of a graphene oxide solution is adjusted, dopamine hydrochloride is added, a precursor solution is obtained and subjected to a hydrothermal reaction, and graphene foam-polydopamine is obtained; (2) preparation of the graphene foam-polydopamine composite membrane: graphene foam-polydopamine is added to N,N-dihydroxyethylglycine and mixed with a temperature-sensitive polymer, the mixture is stirred and subjected to vacuum filtration, and the temperature-sensitive graphene foam-polydopamine composite membrane is obtained. The graphene foam-polydopamine composite membrane prepared through improvement of overall process design, reaction conditions of steps and the like of a key preparation process has good temperature sensitivity and excellent super-hydrophilic property and underwater super-lipophobicity and is very applicable to oil-water separation.

Description

technical field

[0001] The invention belongs to the technical field of functional composite materials, and more specifically relates to the preparation of a graphene foam-polydopamine composite film and its product and application. The graphene foam-polydopamine composite film has good temperature sensitivity. Background technique

[0002] In recent years, oil and organic liquid leakage accidents have caused catastrophic pollution to water resources such as oceans and rivers, brought irreparable economic losses to humans, and seriously endangered the health and safety of humans, animals and plants. In oil-water mixtures from oil and organic fluid spills, the water and oil are not simply mixed together, but emulsified oil droplets of very small size are formed. Such large-scale emulsified oil polluted water is difficult to treat and can cause serious ecosystem problems. At present, membrane technology has been intelligently applied to the separation of emulsion oils of vario...

Examples

Embodiment 1

[0035] Include the following steps:

[0036] (1) Preparation of graphene foam-polydopamine: Mix Tris-HCl with graphene oxide solution, adjust pH, and then ultrasonically disperse graphene oxide sheets in a single sheet. Then add dopamine hydrochloride to ultrasonically disperse, prepare a mixture of graphene oxide and dopamine hydrochloride, and carry out hydrothermal reaction. After the reaction was finished, it was naturally cooled to room temperature, and the resulting black circular gel column was soaked and washed with deionized water, and finally freeze-dried to obtain graphene foam-polydopamine.

[0037] (2) Preparation of temperature-sensitive graphene foam-polydopamine composite film: the graphene foam-polydopamine was ground into small pieces, and then added to N,N-dihydroxyethylglycine for ultrasonic dispersion. Afterwards, it is mixed with N,N-dihydroxyethylglycine solution (prepared in advance) in which the temperature-sensitive polymer is dissolved, stirred and ...

Embodiment 2

[0046] Include the following steps:

[0047] (1) Preparation of graphene foam-polydopamine: Mix Tris-HCl with graphene oxide solution, adjust pH, and then ultrasonically disperse graphene oxide sheets in a single sheet. Then add dopamine hydrochloride to ultrasonically disperse, prepare a mixture of graphene oxide and dopamine hydrochloride, and carry out hydrothermal reaction. After the reaction was finished, it was naturally cooled to room temperature, and the resulting black circular gel column was soaked and washed with deionized water, and finally freeze-dried to obtain graphene foam-polydopamine.

[0048] (2) Preparation of temperature-sensitive graphene foam-polydopamine composite film: the graphene foam-polydopamine was ground into small pieces, and then added to N,N-dihydroxyethylglycine for ultrasonic dispersion. After that, it is mixed with N,N-dihydroxyethylglycine solution in which the temperature-sensitive polymer is dissolved, stirred and reacted, and finally t...

Embodiment 3

[0056] Include the following steps:

[0057] (1) Preparation of graphene foam-polydopamine: Mix Tris-HCl with graphene oxide solution, adjust pH, and then ultrasonically disperse graphene oxide sheets in a single sheet. Then add dopamine hydrochloride to ultrasonically disperse, prepare a mixture of graphene oxide and dopamine hydrochloride, and carry out hydrothermal reaction. After the reaction was finished, it was naturally cooled to room temperature, and the resulting black circular gel column was soaked and washed with deionized water, and finally freeze-dried to obtain graphene foam-polydopamine.

[0058] (2) Preparation of temperature-sensitive graphene foam-polydopamine composite film: the graphene foam-polydopamine was ground into small pieces, and then added to N,N-dihydroxyethylglycine for ultrasonic dispersion. After that, it is mixed with N,N-dihydroxyethylglycine solution in which the temperature-sensitive polymer is dissolved, stirred and reacted, and finally t...

technical field

[0001] The invention belongs to the technical field of functional composite materials, and more specifically relates to the preparation of a graphene foam-polydopamine composite film and its product and application. The graphene foam-polydopamine composite film has good temperature sensitivity. Background technique

[0002] In recent years, oil and organic liquid leakage accidents have caused catastrophic pollution to water resources such as oceans and rivers, brought irreparable economic losses to humans, and seriously endangered the health and safety of humans, animals and plants. In oil-water mixtures from oil and organic fluid spills, the water and oil are not simply mixed together, but emulsified oil droplets of very small size are formed. Such large-scale emulsified oil polluted water is difficult to treat and can cause serious ecosystem problems. At present, membrane technology has been intelligently applied to the separation of emulsion oils of vario...

Examples

Embodiment 1

[0035] Include the following steps:

[0036] (1) Preparation of graphene foam-polydopamine: Mix Tris-HCl with graphene oxide solution, adjust pH, and then ultrasonically disperse graphene oxide sheets in a single sheet. Then add dopamine hydrochloride to ultrasonically disperse, prepare a mixture of graphene oxide and dopamine hydrochloride, and carry out hydrothermal reaction. After the reaction was finished, it was naturally cooled to room temperature, and the resulting black circular gel column was soaked and washed with deionized water, and finally freeze-dried to obtain graphene foam-polydopamine.

[0037] (2) Preparation of temperature-sensitive graphene foam-polydopamine composite film: the graphene foam-polydopamine was ground into small pieces, and then added to N,N-dihydroxyethylglycine for ultrasonic dispersion. Afterwards, it is mixed with N,N-dihydroxyethylglycine solution (prepared in advance) in which the temperature-sensitive polymer is dissolved, stirred and ...

Embodiment 2

[0046] Include the following steps:

[0047] (1) Preparation of graphene foam-polydopamine: Mix Tris-HCl with graphene oxide solution, adjust pH, and then ultrasonically disperse graphene oxide sheets in a single sheet. Then add dopamine hydrochloride to ultrasonically disperse, prepare a mixture of graphene oxide and dopamine hydrochloride, and carry out hydrothermal reaction. After the reaction was finished, it was naturally cooled to room temperature, and the resulting black circular gel column was soaked and washed with deionized water, and finally freeze-dried to obtain graphene foam-polydopamine.

[0048] (2) Preparation of temperature-sensitive graphene foam-polydopamine composite film: the graphene foam-polydopamine was ground into small pieces, and then added to N,N-dihydroxyethylglycine for ultrasonic dispersion. After that, it is mixed with N,N-dihydroxyethylglycine solution in which the temperature-sensitive polymer is dissolved, stirred and reacted, and finally t...

Embodiment 3

[0056] Include the following steps:

[0057] (1) Preparation of graphene foam-polydopamine: Mix Tris-HCl with graphene oxide solution, adjust pH, and then ultrasonically disperse graphene oxide sheets in a single sheet. Then add dopamine hydrochloride to ultrasonically disperse, prepare a mixture of graphene oxide and dopamine hydrochloride, and carry out hydrothermal reaction. After the reaction was finished, it was naturally cooled to room temperature, and the resulting black circular gel column was soaked and washed with deionized water, and finally freeze-dried to obtain graphene foam-polydopamine.

[0058] (2) Preparation of temperature-sensitive graphene foam-polydopamine composite film: the graphene foam-polydopamine was ground into small pieces, and then added to N,N-dihydroxyethylglycine for ultrasonic dispersion. After that, it is mixed with N,N-dihydroxyethylglycine solution in which the temperature-sensitive polymer is dissolved, stirred and reacted, and finally t...

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