纳米二氧化钛负载棉织物的制备及性能

Preparation and Characterization of Self-cleaning Cotton Fabric

以棉织物为基体,通过紫外辐照和超声法将不同表面性质的TiO_2纳米粒子负载到棉织物上,制备自清洁材料.利用扫描电子显微镜、能谱分析、接触角、紫外-可见光谱及降解甲基橙溶液等手段分别对样品表面的结构形貌、元素分布、光催化活性、紫外屏蔽性能和耐久性等进行分析.结果表明,棉织物经紫外辐照后,TiO_2纳米粒子与其结合更牢固,耐久性更佳;TiO_2负载后的棉织物表现出超疏水性能及优异的光催化活性和紫外屏蔽性能;与未改性的TiO_2纳米粒子相比,由聚乙烯醇(PVA)改性的TiO_2纳米粒子制备的自清洁棉织物的可见光光催化活性更高,其可见光的光催化效率是前者的3.9倍.PVA改性的纳米TiO_2对290~400 nm范围内的紫外光有较好的吸收作用,其紫外屏蔽效果更佳.

Self-cleaning cotton fabric with bared and modified TiO_2 nanoparticles on the surface was achieved by ultraviolet radiation and ultrasonic wave. The surface morphology,element distribution,photocatalytic activity, ultraviolet screening performance of original and modified cotton fabric were systematically investigated with scanning electron microscope（ SEM）,energy dispersive spectrometer（ EDS）,contact angle,ultraviolet-visible absorption spectrometry and photocatalytic degradation of methyl orange（ MO）. The results show that the adhesion between cotton fabric and nanoparticles has been enhanced after UV irradiation,as well as loaded stability and wash resistance. Cotton fabric with TiO_2 nanoparticles on the surface shows super-hydrophobic behavior,excellent photocatalytic activity and UV screening property. Compared with the bared TiO_2 nanoparticles,TiO_2 nanoparticles modified by polyvinyl alcohol（ PVA） shows 3. 9 times higher photocatalytic activity in the visible light regime. In addition,a higher UV-Vis absorption in the region of290—400 nm wavelength can be observed for the modified TiO_2 nanoparticles,thereby exhibiting a better UV screening performance.