Preparation And Properties Of Graphitic Carbon Nitride Copper Supported Antibacterial Fibers

Infectious diseases caused by pathogenic bacteria have become a major global health problem.Antibiotics can prevent bacterial infections,but their overuse can lead to the emergence of multi-drug-resistant bacteria.Therefore,it is urgent to prepare antibacterial materials that can effectively inhibit bacterial growth.At present,most of the common metal antibacterial materials achieve antibacterial effect by ion overflow,but this method has the problems of harming health and poor durability.Moreover,the use of precious metal particle antibacterial materials will have the problem of high price,so it is urgent to develop a healthy,durable and cost-effective antibacterial material.Copper nanoparticles（Cu NPs）are nanomaterials with catalytic properties,optical properties,electrical properties,antibacterial and antifungal activities.Copper nanoparticles are easily agglomerated and easily oxidized to form copper oxide.In order to prevent the agglomeration of copper nanoparticles,copper nanoparticles usually need to be supported on organic or inorganic materials,such as carbon,silica,and multi-layer graphene.As a new type of organic semiconductor material,graphitic carbon nitride（g-C₃N₄）is non-toxic,non-polluting,easy to synthesize,easy to functionalize,excellent stability,extremely high photocatalytic activity and good biological phase Capacitive and other advantages,and the C and N in its structural unit form a highly delocalizedπ-bonded conjugated structure through sp²hybridization,which is suitable as a dispersion material for metal nanoparticle antibacterial agents.In this paper,water-soluble g-C₃N₄（CN-C）was prepared by one-step method using potassium persulfate（K₂S₂O₈）as oxidant,and then graphite phase nitride was prepared by using L-ascorbic acid（C₆H₈O₆）as reducing agent and capping agent.Carbon-supported copper nanocomposite（Cu/CN-C）,Cu/CN-C was supported on low-melting skin-core polyester fiber（LMPET）by padding-hot bonding method to obtain graphite phase carbon nitride supported copper antibacterial Polyester fiber（Cu/CN-C@LMPET）.A series of characterization methods such as field emission scanning electron microscopy（FESEM）,transmission electron microscopy（TEM）,X-ray diffraction（2D-XRD）,and infrared spectroscopy（FTIR）were used to analyze the morphologies of the nanocomposites and antibacterial polyester fibers.The antibacterial properties and washing resistance of Cu/CN-C@LMPET were studied by targeting S.aureus and E.coli,and the results showed that Cu/CN-C@LMPET The antibacterial rates against S.aureus and E.coli were both greater than 99.00%.After 50 washings,the antibacterial rates of Cu/CN-C@LMPET against S.aureus and E.coli could still reach 80.00%.This paper speculated that the Cu/CN-C@LMPET generated reactive oxygen radicals（ROS）such as superoxide（·O₂^-）and singlet oxygen（¹O₂）during the reaction,resulting in bacterial cell death.In addition,the cytotoxicity test of Cu/CN-C@LMPET fiber leaching solution proved that the antibacterial polyester fiber was safe for human body,and the test results of its mechanical strength,water absorption,hydrophobicity and softness showed that Cu/CN-C nanometer the finishing of the composite antibacterial agent did not significantly impair the inherent physical properties of the fibers.The paper further uses polyamide 6（PA6）,which is more hydrophilic than LMPET,as a carrier,and supports Cu/CN-C on PA6 by centrifugal electrospinning to prepare a graphitic carbon nitride-supported copper antibacterial polymer.amide fibers（Cu/CN-C@PA6）.The morphology and structure of the antibacterial polyamide fibers were analyzed by a series of characterization methods such as FESEM,2D-XRD,and FTIR.Washing resistance,the results show that the antibacterial rate of Cu/CN-C@PA6against S.aureus and E.coli is greater than 99.00%,after 50 washings,Cu/CN-C@PA6is antibacterial against S.aureus and E.coli The rate can still reach 99.00%.In addition,the cytotoxicity test of Cu/CN-C@PA6 fiber leaching solution proved that the antibacterial polyamide fiber was safe for human body,and its inherent physical properties such as mechanical strength,water absorption,hydrophobicity and softness had not changed to a great extent change.The antibacterial fibers studied in this paper have good antibacterial activity and excellent durability,which provides a feasible method for the development of antibacterial fibers based on copper nanoparticles.