A slow-release long-acting nano antibacterial material and its preparation and application method
A nano-antibacterial material and slow-release technology, which is applied in the field of slow-release long-acting nano-antibacterial materials and their preparation, can solve the problems of random uncontrollability, discoloration, and poor long-term stability of antibacterial properties, and achieve stable and controllable release speed. The effect of enhancing the sustained-release effect and increasing the probability of excitation
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[0016] The preparation method of described antibacterial material, comprises the following steps:
[0017] 1) Synthesis of silver ion-doped bismuth tungstate nanoparticles by one-step hydrothermal method: mix 1-5mmol sodium oleate with 0.1-2mmol Bi(NO 3 ) 3 ·5H 2 O was added to deionized water, stirred for 0.2-2 hours, and then 0.01-0.2mmol AgNO 3 Added to the above mixture, magnetically stirred for 0.5-2 hours, and then 0.1-2mmol Na 2 WO 4 2H 2 O was added to the above solution, and magnetically stirred for 0.5-2 hours, and then the obtained mixed solution was added into a polytetrafluoroethylene reaction tank, and heated in water at 160-220° C. for 18-32 hours. Cool to room temperature, wash the obtained precipitate with n-hexane and ethanol for 3-6 times, and dry at 50-80° C. for 5-10 hours to obtain a silver ion-doped bismuth tungstate nanoparticle.
[0018] 2) Preparation of nano antibacterial material: the silver ion-doped bismuth tungstate nanoparticles prepared i...
Embodiment 1
[0023] 2.2mmol sodium oleate and 0.4mmol Bi(NO 3 ) 3 ·5H 2 O was added to 40ml deionized water, stirred for 0.3 hours, and then 0.01mmol AgNO 3 Added to the above mixture, stirred for 30 minutes, and then 0.4mmol Na 2 WO 4 2H 2 O was added to the above solution, stirred magnetically for 2 hours, and then the obtained mixed solution was added into a 50ml polytetrafluoroethylene reaction tank, and heated at 180°C for 18 hours. After cooling to room temperature, the obtained precipitate was washed three times with n-hexane and ethanol, and dried at 60°C for 5 hours to obtain a silver ion-doped bismuth tungstate nanoparticle.
[0024] The prepared silver ion-doped bismuth tungstate nanoparticles were mixed uniformly by mechanical ball milling for 2 hours with a mass fraction of 10% and a mass fraction of 90% water glass powder (the molar ratio of silicon oxide to sodium oxide was 0.8:1), Obtain nano antibacterial materials.
Embodiment 2
[0026] 4.4mmol sodium oleate and 0.8mmol Bi(NO 3 ) 3 ·5H 2 O was added to 40ml deionized water, stirred for 0.4 hours, and then 0.01mmol AgNO 3 Added to the above mixture, stirred for 1 hour, and then 0.8mmol Na 2 WO 4 2H 2 O was added to the above solution, stirred by magnetic force for 1 hour, and then the obtained mixed solution was added into a 50ml polytetrafluoroethylene reaction tank, and heated at 200°C for 24 hours. After cooling to room temperature, the obtained precipitate was washed 6 times with n-hexane and ethanol, dried at 70°C for 8 hours, and the powder obtained after drying was silver ion-doped bismuth tungstate nanoparticles.
[0027]The prepared silver ion-doped bismuth tungstate nanoparticles were mixed by mechanical ball milling for 1 hour with a mass fraction of 40% and a mass fraction of 60% water glass powder (the molar ratio of silicon oxide to sodium oxide was 1:1), and uniformly mixed. Obtain nano antibacterial materials.
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