Preparation And Properties Of Functional Textiles Based On Visible-light Catalytic Activity

Graphite phase carbonitride?g-C₃N₄?is a new type of non-metallic semiconductor photocatalytic material,which has received extensive attention due to its visible light response.However,g-C₃N₄ material has a faster recombination rate of photogenerated electrons and holes.Low disadvantages,and the powder g-C₃N₄ is difficult to separate and recover,which is easy to cause secondary pollution and is not conducive to repeated reuse of materials,which limits the further application development of the material.It is an effective way to broaden the application of this material by optimizing the preparation methods and conditions to improve the photocatalytic performance of g-C₃N₄ and loading the powder g-C₃N₄.In addition,the development of functional textiles based on photocatalytic technology is also a research hotspot in the field of textiles.The photochemical activity of photocatalysts can not only impart self-cleaning and anti-ultraviolet functions to textiles,but also obtain functional textiles in the field of degradation of organic pollutants.It also has certain application prospects.In this study,the carbon template method was used to prepare carbon nitride.The effect of the amount of gaseous templating agent on the catalytic degradation of the material under visible light source was investigated.The graphite phase carbon nitride with visible light catalytic activity was prepared.The strong oxidation and hydration of concentrated sulfuric acid were carried out.The exothermic effect peels off and protonates the carbon nitride intercalation to form a small-sized carbonitride aqueous dispersion,and is applied to the polyester fabric by a simple spraying method to impart ultraviolet and photocatalytic properties;utilizing the difference between carbon nitride and zinc oxide The forbidden band width and synergistic effect achieve the purpose of broadening the light response range and enhancing the degradation efficiency of the catalyst.A multifunctional textile based on visible light catalysis technology is prepared by in-situ loading on the surface of the cotton fabric.The main research contents of the thesis are as follows:?1?Preparation of graphite phase carbonitride by gas template method and its properties.Graphite phase carbon nitride?CNAC?with higher catalytic activity was prepared by high temperature calcination with dicyandiamide as precursor and ammonium chloride as gas template.The effect of gas template on the structure and properties of photocatalytic materials was investigated.The results show that by introducing a gas template,the forbidden band width of the material is reduced,the light absorption performance is enhanced,and the degree of electron and hole separation of the material is enhanced,and the photocatalytic degradation performance is remarkably improved.Under visible light source illumination for 2 h,Rhodamine The degradation rate of B?RhB?reached 94%.?2?Study on the process and properties of protonated carbon nitride finishing polyester fabric.The carbon monoxide is treated by a strong oxidation of concentrated sulfuric acid,washed with water,and centrifuged to obtain white protonated carbon nitride?CNHS?and a highly dispersed CNHS aqueous dispersion.The CNHS aqueous dispersion was sprayed onto the surface of the polyester fabric by spraying to obtain CNHS/PET loaded with CNHS photocatalyst fabric.The effects of finishing process on the photocatalytic performance,whiteness and UV protection of fabrics were investigated.The results show that:CNHS/PET has excellent photocatalytic degradation performance,the simulated light is 210 min,the degradation rate of methylene blue dye?MB?is 73.24%;the UV protection performance of fabric reaches the highest level,the UPF value is>50+,and the original fabric The style,feel and other styles are not affected.?3?In-situ preparation and properties of zinc oxide-carbon nitride loaded cotton fabric.A functionalized cotton fabric ZnO-CNAC/CT was prepared by in-situ preparation of zinc oxide-carbon nitride?ZnO-CNAC?composite photocatalyst on the surface of cotton fabric.The effects of ZnO-CNAC on the whiteness and strength of fabrics were investigated.The UV protection performance and self-cleaning properties of ZnO-CNAC/CT were systematically investigated.The results show that ZnO-CNAC/CT has excellent photocatalytic degradation performance,and simulated solar illumination for 75 min.The degradation rate of 2 mg/L methylene blue?MB?is 93.53%,and the degradation performance is much higher than that of fabrics ZnO/CT and CN/CT which are finished by single photocatalyst,and ZnO-CNAC/CT is kept after 5 times of repeated use.Good catalytic performance.