Nano silver loaded graphene antibacterial composite material and preparation method thereof
A composite material and graphene technology, applied in botany equipment and methods, chemicals for biological control, animal repellants, etc., can solve the problem of high antibacterial concentration, low silver particle loading, silver/graphene Poor biological security and other issues, to achieve the effect of preventing discontinuity of the sheet
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Embodiment 1
[0034] This embodiment provides a method for preparing nano-silver-loaded graphene antibacterial composite material, which includes the following steps:
[0035] S1. Preparation of graphene oxide aqueous solution: the modified Hummers method is used to prepare graphene oxide, and then the second ultrasonic dispersion is performed to obtain 0.04g / L single-layer graphene oxide aqueous solution, and then silver nitrate is added to obtain a silver nitrate / graphene oxide mixed solution , The concentration of silver nitrate is 0.08g / L;
[0036] S2. Add glucose and soluble starch to the step silver nitrate / graphene oxide mixed solution, the glucose concentration is 0.072g / L, the soluble starch concentration is 0.08g / L, and then placed in a hydrothermal reaction kettle, using hydrothermal reaction, The reaction temperature is 100°C, the reaction time is 6h, and the steam pressure is 0.3-4Mpa. After the reaction, it is naturally cooled to room temperature, and then the product is separated,...
Embodiment 2
[0050] This embodiment provides a method for preparing nano-silver-loaded graphene antibacterial composite material, which includes the following steps:
[0051] S1. Preparation of graphene oxide aqueous solution: the modified Hummers method is used to prepare graphene oxide, and then the second ultrasonic dispersion is performed to obtain 0.09g / L monolayer graphene oxide aqueous solution, and then silver nitrate is added to obtain a silver nitrate / graphene oxide mixed solution , The concentration of silver nitrate is 0.18g / L;
[0052] S2. Add glucose and soluble starch to the step silver nitrate / graphene oxide mixed solution, the glucose concentration is 0.432g / L, the soluble starch concentration is 0.16g / L, and then placed in a hydrothermal reaction kettle, using hydrothermal reaction, The reaction temperature is 140°C, the reaction time is 4h, and the water vapor pressure is 0.3-4Mpa. After the reaction, it is naturally cooled to room temperature, and the product is separated, w...
Embodiment 3
[0058] This embodiment is basically the same as embodiment 1, except that the hydrothermal reaction temperature in step S2 is 200° C. and the reaction time is 4 h; the hydrothermal reaction temperature in step S3 is 140° C. and the reaction time is 6 h.
[0059] The loading amount of nano silver particles in the graphene / nano silver composite material prepared in this embodiment is 42.00%. When the concentration is 0.09 μg / ml, the antibacterial rate against E. coli reaches 99.7%. The loading of nano silver particles in this embodiment The main reason for the large reduction in the amount is that the graphene oxide will exhibit thermal weight loss behavior in step S2, and the oxygen-containing functional groups are decomposed in a large amount, resulting in a reduction in the amount of reduced silver ions.
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