Preparation and antibacterial properties of carbon quantum dots with Monopterus albus bones
In this study,the bones,Monopteros albus processing by-products,were used as carbon source to synthesize Mab-CQDs using one-step green hydrothermal method.The effects of bone powder amount,reaction temperature,and reaction time on the fluorescence intensity were investigated to optimize the prep-aration process of Mab-CQDs.The morphology and optical properties of Mab-CQDs were characterized using transmission scanning electron microscopy(TEM),infrared spectroscopy(FT-IR),and X-ray Pow-der diffractometer(XRD).In addition,pathogenic bacteria Staphylococcus aureus and Escherichia coli were selected as the test strains to investigate the antimicrobial properties of Mab-CQDs.The optimal prep-aration conditions of Mab-CQDs were as follows:Bone powder to ultrapure water of 1∶30,hydrothermal re-action temperature of 180℃,hydrothermal reaction time of 8 h,and Mab-CQDs prepared under optimal conditions had good fluorescence properties.The TEM image and particle size distribution showed that Mab-CQDs were well-dispersed spherical structures with particle sizes ranging from 2.05 nm to 5.94 nm.The FT-IR showed that the surface of Mab-CQDs contained a large number of polar groups such as amino and carboxyl groups,leading to excellent hydrophilicity.The antibacterial experiment showed that Mab-CQDs had an ideal inhibitory effect on Staphylococcus aureus and Escherichia coli,and the minimum inhib-itory concentration was 5 mg/mL and 10 mg/mL,respectively.The Mab-CQDs prepared in this study had uniform particle size,good water solubility,excellent fluorescence properties,and obvious bacteriostatic properties,which may provide theoretical guidance for preparing freshwater fish processing by-product-based CQDs and their applications.
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