Preparation method for preparing porous gelatin film from GO (graphene oxide) stabilized Pickering emulsion

Abstract

The invention discloses a preparation method for preparing a porous gelatin film from a GO (graphene oxide) stabilized Pickering emulsion. The method comprises the steps as follows: a proper amount ofGO is added to deionized water, a GO suspended dispersion liquid is prepared, and ultrasonic treatment is performed; a gelatin solution is dissolved in the GO suspension, benzoate is added to serve as an oil phase, and ultrasonic treatment is performed; a sample in placed in a water bath, then casting is performed, and a non-crosslinked film is obtained; the non-crosslinked film is impregnated ina solution containing a crosslinking agent for a period to be crosslinked, then, the film is washed with ethanol and deionized water, finally, the film is dried, and the gelatin film adopting a porous structure is obtained. The preparation process for preparing the porous gelatin film from the Pickering emulsion is simple, green, environmentally friendly, has low equipment requirement, high aqueous solution stability and uniform porous structure, is prone to large-scale production and has wide application prospects in wastewater separation, gas separation, food emulsification, catalysis, heavy metal ion detection and other fields.

Description

Technical field

[0001] The invention relates to the field of preparation of porous gelatin films, in particular to a method for preparing porous gelatin films from graphene oxide (GO) stabilized Pickering emulsions.

Background technique

[0002] Polymer membranes play a vital role in the water separation and filtration industry. However, its preparation process uses a large amount of toxic organic solvents, and the post-treatment of organic solvents is very expensive. Due to the renewable nature of bio-based polymers, bio-based polymers can be used to replace petroleum-based polymers. However, there are still many disadvantages to prepare porous membranes from bio-based polymers: (1) Compared with petroleum-based polymers, most bio-based polymers are water-soluble; Being able to maintain structural stability in water is essential. (2) The temperature change during the preparation process will cause a strong change in its conformation (such as physical gelatinization, ...

Examples

Embodiment 1

[0021] Add an appropriate amount of GO to deionized water to obtain a concentration of 1 g.L -1 GO suspension dispersion, and ultrasonic treatment for 10min; 15% W / V gelatin solution was added to the GO suspension at 30°C for dissolution, and ethyl benzoate was added as the oil phase, and the oil-water volume ratio (O / W) was 0.25, sonicated for 5 minutes, placed in a water bath at 40°C for 0.5h, then poured to form a film, and then placed at 40°C for 2 days to obtain an uncrosslinked film.

[0022] Immerse the uncrosslinked membrane in a 1wt% glyoxal solution with ethanol as a solvent, and maintain crosslinking in the glyoxal solution for 3 hours at 40°C; the crosslinked membrane is washed with ethanol and deionized water until the upper layer The supernatant was clear and transparent; the film was then dried again to obtain a gelatin film with a porous structure.

Embodiment 2

[0024] Add an appropriate amount of GO to deionized water to obtain a concentration of 3 g.L -1 GO suspension dispersion liquid, and ultrasonic treatment for 30min; 30% W / V gelatin solution was added to the GO suspension at 40°C for dissolving, and propyl benzoate was added as the oil phase, and the oil-water volume ratio (O / W) was 0.5, sonicate for 10 minutes, place in a water bath at 50°C for 1 hour, cast to form a film, and then place at 50°C for 3 days to obtain an uncrosslinked film.

[0025] Immerse the uncrosslinked membrane in a 2.5wt% malondialdehyde solution with ethanol as a solvent, and keep crosslinking in the malondialdehyde solution at 50°C for 5h; the crosslinked membrane is washed with ethanol and deionized water until The supernatant was clear and transparent; the film was then dried again to obtain a gelatin film with a porous structure.

Embodiment 3

[0027] Add an appropriate amount of GO to deionized water to obtain a concentration of 6 g.L -1 The GO suspension dispersion liquid, and sonication 60min; The gelatin solution of 45%W / V is added in the GO suspension liquid at 50 ℃ and dissolves, and butyl benzoate is added as the oil phase, and the oil-water volume ratio (O / W) is 0.75, sonicated for 15 minutes, placed in a water bath at 60°C for 1.5h, then poured to form a film, and then placed at 60°C for 4 days to obtain an uncrosslinked film.

[0028] Immerse the uncrosslinked membrane in a 4wt% glutaraldehyde solution with ethanol as a solvent, and keep it in the glutaraldehyde solution for 7 hours at 60°C to crosslink; the crosslinked membrane is washed with ethanol and deionized water until the upper layer The supernatant was clear and transparent; the film was then dried again to obtain a gelatin film with a porous structure.

Technical field

[0001] The invention relates to the field of preparation of porous gelatin films, in particular to a method for preparing porous gelatin films from graphene oxide (GO) stabilized Pickering emulsions.

Background technique

[0002] Polymer membranes play a vital role in the water separation and filtration industry. However, its preparation process uses a large amount of toxic organic solvents, and the post-treatment of organic solvents is very expensive. Due to the renewable nature of bio-based polymers, bio-based polymers can be used to replace petroleum-based polymers. However, there are still many disadvantages to prepare porous membranes from bio-based polymers: (1) Compared with petroleum-based polymers, most bio-based polymers are water-soluble; Being able to maintain structural stability in water is essential. (2) The temperature change during the preparation process will cause a strong change in its conformation (such as physical gelatinization, ...

Examples

Embodiment 1

[0021] Add an appropriate amount of GO to deionized water to obtain a concentration of 1 g.L -1 GO suspension dispersion, and ultrasonic treatment for 10min; 15% W / V gelatin solution was added to the GO suspension at 30°C for dissolution, and ethyl benzoate was added as the oil phase, and the oil-water volume ratio (O / W) was 0.25, sonicated for 5 minutes, placed in a water bath at 40°C for 0.5h, then poured to form a film, and then placed at 40°C for 2 days to obtain an uncrosslinked film.

[0022] Immerse the uncrosslinked membrane in a 1wt% glyoxal solution with ethanol as a solvent, and maintain crosslinking in the glyoxal solution for 3 hours at 40°C; the crosslinked membrane is washed with ethanol and deionized water until the upper layer The supernatant was clear and transparent; the film was then dried again to obtain a gelatin film with a porous structure.

Embodiment 2

[0024] Add an appropriate amount of GO to deionized water to obtain a concentration of 3 g.L -1 GO suspension dispersion liquid, and ultrasonic treatment for 30min; 30% W / V gelatin solution was added to the GO suspension at 40°C for dissolving, and propyl benzoate was added as the oil phase, and the oil-water volume ratio (O / W) was 0.5, sonicate for 10 minutes, place in a water bath at 50°C for 1 hour, cast to form a film, and then place at 50°C for 3 days to obtain an uncrosslinked film.

[0025] Immerse the uncrosslinked membrane in a 2.5wt% malondialdehyde solution with ethanol as a solvent, and keep crosslinking in the malondialdehyde solution at 50°C for 5h; the crosslinked membrane is washed with ethanol and deionized water until The supernatant was clear and transparent; the film was then dried again to obtain a gelatin film with a porous structure.

Embodiment 3

[0027] Add an appropriate amount of GO to deionized water to obtain a concentration of 6 g.L -1 The GO suspension dispersion liquid, and sonication 60min; The gelatin solution of 45%W / V is added in the GO suspension liquid at 50 ℃ and dissolves, and butyl benzoate is added as the oil phase, and the oil-water volume ratio (O / W) is 0.75, sonicated for 15 minutes, placed in a water bath at 60°C for 1.5h, then poured to form a film, and then placed at 60°C for 4 days to obtain an uncrosslinked film.

[0028] Immerse the uncrosslinked membrane in a 4wt% glutaraldehyde solution with ethanol as a solvent, and keep it in the glutaraldehyde solution for 7 hours at 60°C to crosslink; the crosslinked membrane is washed with ethanol and deionized water until the upper layer The supernatant was clear and transparent; the film was then dried again to obtain a gelatin film with a porous structure.