A polyamide film loaded with graphene oxide nanoflakes and its preparation method and application
A polyamide film and nanosheet technology, which is used in general water supply conservation, osmotic/dialysis water/sewage treatment, seawater treatment, etc., can solve the problems of short duration of antibacterial effect, cumbersome cleaning, etc., so as to reduce production costs and reduce cleaning. The number of times, the effect of good application prospects
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[0033] A preparation method for a polyamide film loaded with graphene oxide nano-flakes, comprising the following steps:
[0034] 1) Preparation of graphene
[0035] Add 1.5 g of graphite to 200 mL of H at a volume ratio of 9:1 2 SO 4 and H 3 PO 4 In the mixed solution, after ultrasonic treatment for 5-10min at the same time, the reaction solution was obtained, and the reaction solution was treated in an ice bath; then, 5-10g KMnO was added to the reaction solution 4 powder, without constant stirring, the solution was slowly heated to a constant temperature of 50°C, and stirred for 12 hours to obtain a graphene solution.
[0036] 2) Preparation of graphene oxide
[0037] The steps mainly include:
[0038] First, after slowly returning the graphene solution to room temperature, add 3~5mL H 2 o 2, and dilute to 2L with distilled water at the same time, make the solution pass through a 44 μm standard metal test sieve, use a polytetrafluoroethylene syringe filter with a po...
Embodiment 1
[0053] Firstly, graphene oxide is prepared. Add 1.5 g of graphite to 200 mL of H at a volume ratio of 9:1 2 SO 4 :H 3 PO 4 In the mixed solution, ultrasonic treatment (using 26WL-1, FS60 ultrasonic cleaner) for 5 minutes at the same time, put the reaction vessel in an ice bath; continue to add 9gKMnO to the mixed solution 4 powder, keep stirring, heat the solution slowly and keep it constant at 50°C, stir for 12h, after the mixture slowly returns to room temperature, add 3mLH 2 o 2 , and dilute to 2L with distilled water simultaneously; Then, make the solution pass through the standard metal test sieve of 44 μm, utilize the polytetrafluoroethylene syringe filter of aperture 5 μm to carry out vacuum suction filtration, collect the solid component in the filtrate; Use 100mL distilled water, 100mL1 successively: 10% hydrochloric acid solution, 100mL distilled water, and 100mL ethanol were used to wash the collected solid components. At the same time of each cleaning, the mix...
Embodiment 2
[0057] The sterilizing effect of graphene oxide-loaded polyamide films was evaluated using the plate count method. Before the experiment, at first it is necessary to test the water contact angle of each composite polyamide film prepared in Example 1, and take the composite film with a contact angle less than 65° to carry out the sterilization test experiment. Under the condition of 37°C, the K12 strain of Escherichia coli was cultured in LB medium overnight, and then the E. coli population was diluted with fresh LB medium, and cultivated for about 2 hours, so that the growth of the strain was in the logarithmic growth phase. After the obtained bacteria were washed three times with 0.9% sterile saline solution, they were diluted to 107 CFUmL-1 with sterile saline solution. A 1.5cm2 pure polyamide film and a polyamide film loaded with graphene oxide nanoflakes were taken for comparative experiments. Apply the bacterial liquid on the film at a concentration of 0.5mL / cm2, so that...
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