Study On The Structure And Properties Of The Nano Particles On The Fabric Substrate Mediated By Polydopamine

With the application of nanotechnology,more and more scientists combine textiles with nanomaterials to form better properties and give more new functions to textiles on the basis of traditional textiles.However,due to the lack of strong adhesion,nanoparticles loaded on the surface of the fabric are easy to fall off from the fabric when dealing with pollutants,resulting in the decline of the function of the fabric,and even secondary pollution.Therefore,it is of great significance to improve the adhesion of nanoparticles on the surface of the fabric for functional textiles.In this project,cotton fabric is used as the substrate,modified by dopamine,and then functionalized to realize the application of fabric in different fields.The main work and contributions are as follows:?1?BiVO₄@PDA nanoparticles with core-shell structure were prepared by dopamine self polymerization and fixed on the surface of cationic modified cotton fabric to produce cotton@BiVO₄@PDA fabric.Through SEM,XPS,XRD,TEM and other tests,the microstructure of BiVO4 nanoparticles,BiVO₄@PDA nanoparticles and cotton@BiVO₄@PDA fabric were characterized,and the photocatalytic properties of cotton@BiVO₄@PDA fabric were tested.The results show that the thickness of PDA layer is about 13nm,and the characteristic peak of PDA can be seen in FTIR.BiVO₄@PDA has a strong absorption in the UV-Vis spectrum,and the band gap energy is 2.47e V.BiVO₄@PDA nanoparticles were coated on cotton fabric,and a large number of nanoparticles were evenly distributed in the grooves between the fiber surface and the fiber.The signals of Bi,V and O in different states were observed by XPS,and the characteristic peaks of BiVO₄ were found in XRD.The prepared cotton@BiVO₄@PDA fabric successfully degraded MB aqueous solution under visible light.In the presence of cotton@BiVO₄@PDA fabric,the UV visible absorption peak of MB solution gradually decreased with the increase of time,and disappeared after 250minutes.The apparent reaction rate constant k of Langmuir hinshlwood first-order reaction in MB photodegradation kinetic analysis was calculated to be 0.0157.The photocatalytic activity of cotton@BiVO₄@PDA fabric reached 98%after three times of operation.?2?The?-FeOOH nanorods were deposited on the surface of cotton fabric by PDA,and the cotton@PDA@FeOOH@DDT fabric was produced.Through SEM,XPS,XRD and TG,the micro characterization of raw cotton fabric and cotton@PDA@FeOOH fabric was carried out,and the photocatalytic performance of cotton@PDA@FeOOH fabric was tested.The contact angle and oil-water separation of cotton@PDA@FeOOH@DDT fabric were tested.The results showed that?-FeOOH nanorods were successfully grown on PDA cotton fabric by morphology,XPS analysis and XRD characterization,and the addition of?-FeOOH improved the thermal stability of the cotton fabric.According to the water/oil contact angle and its interaction with water/oil,the fabric shows super hydrophobicity and lipophilicity.After oil-water separation with different oil,the separation rate is more than 98%,and the durability is up to 50 cycles.After 5 cycles,the stability and reliability of MB degradation by visible light were 90%.When visible light reacts with cotton@PDA@FeOOH fabric,the strong oxidability of·O₂^-and·OH in electron pair and hole pair degrades MB to CO₂ and H₂O,which explains the photocatalytic mechanism.