| Iin order to quantitatively evaluate and systematically study the self-cleaning properties of fabric finished by nano-Ti02 particles,firstly we prepared the nano-TiO2 hydrogel to finish fabric by padding and then adsorbed the fabric by five kinds of different structures of organic dyes(Rhodamine B,methylene blue,Reactive Red 195,Acid Black 234 and Acid Blue 7)as simulated stains were investigated.The degradation of nano-TiO2 finishing fabric to dyes adsorbed on fabric surface under ultraviolet light irradiation,it also be called self-cleaning property of the fabric.Focusing on the quantity of nano-TiO2 loaded on fabric,the concentration of dye solution,the molecular structure of dyes,methods of finishing fabric,the type of fabric and the nature of the radiation on the impact of fabric self-cleaning perlformance to the surface adsorption of dyes,and by testing color value(K/Smax)of the finishing fabric that has adsorbed dyes and the maximum absorption wavelength(λmax)were used to evaluate the self-cleaning performance of the fabric quantitatively.In addition,UV-visible spectrLum,total organic carbon(TOC)test and gas chromatography-mass spectrometry(GC-MS)analysis of the extracts of the dye degradation products adsorbed on the fabric surface Rhodamine B to reach self-cleaning mechanism.Finally,the self-cleaning effect of three types of actual stains,such as red wine,coffee and soy sauce,on the nano-TiO2 hydrogel-finishing fabric under sunlight irradiation was examined.The mechanical properties of the finished fabiric after self-cleaning experiment were analyzed to evaluate the self-cleaning function of fabric damage after cleaning.At last,the reusability of nano-TiO2 hydrogel-finishing polyester fabric and the influence of accessory auxiliaries on fabric self-cleaning performance were also studied.The results show that nano-TiO2 finishing fabric prepared by the padding method has excellent self-cleaning properties for all five dyes under the condition of UV radiation.Improving the quantity of the nano-TiO2 loading on the fabric surface can significantly improve the self-cleaning of the nano-TiO2 hydrosol finishing fabric,polyester fabrics also show excellent self-cleaning properties under solar radiation conditions.The self-cleaning property of the fabric using nano-TiO2 hydrosol prepared by the padding method is better than that the fabric using nano-TiO2 hydrosol prepared by exhausting method,and the self-cleaning performance of the finished polyester fabric is better than that of finishing polyester fabrics,even better than cotton and hemp or Wool fabric.By comparing the self-cleaning properties of nano-TiO2 hydrogel-finishing fabric for different structural dyes,it can be found that the more complex the molecular structure or the larger the conjugate structure,the more difficult for the dye to be removed on the finishing fabric.In the process of self-cleaning,the aromatic ring structure and the azo bond conjugate system of rhodamine B dye molecules are destroyed,and their molecules are gradually degraded and mineralized into carbon dioxide and water.Under the conditions of solar radiation,nano-TiO2 hydrosol finishing polyester fabric self-cleaning effect of coffee stains was significantly better than the red wine and soy sauce stains.The mechanical properties of finishing polyester fabric changed little in the cleaning process,while the mechanical properties of finishing cotton fabric decreased more significantly.The addition of fixatives and softeners affected the self-cleaning properties of the resulting nano-TiO2 hydrosol-treated polyester fabrics,but significantly improved the washing fastness. |
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