TiO_2纳米晶的低温制备及其抗紫外线性能

TiO_2 Nanocrystalline Prepared at Low Temperature and its Anti-ultraviolet Performance

采用溶胶-凝胶法，在低温条件下制备纳米TiO2，用X射线衍射（XRD）对其结构和粒径进行表征，并测试分析了纳米TiO2溶胶对紫外-可见光的透射和吸收特性．结果表明，制得的纳米TiO2为锐钛矿型纳米晶，粒子尺寸小于10nm.纳米TiO2溶胶在波长250-350nm的紫外光区透射率极小，在220-340nm区域出现强吸收峰．将制得的纳米TiO2制成整理剂用于织物的整理．经过处理的棉织物对紫外线的阻隔率明显提高，紫外线防护指数（UPF值）从未处理时的6．72增加到50以上，表现出优异的抗紫外线性能．

Nano-TiO2 was prepared by sol-gel method at low temperature. The microstructure and particle size were characterized by X-ray Diffraction （XRD） techniques. Ultraviolet-visible transmittance and absorbability of the nano-TiO2 sols were tested. The results show that the produced nano-TiO2 is a nanocrystalline with anatase-phase and the size of particles is less than 10 nm. The transmittance of nano TiO2 sols are very low in the ultraviolet range （250 -350 nm） and there is a strong absorption between 220 and 340 nm. Furthermore, the prepared nano-TiO2 formed a finishing agent that was used to treat the fabrics. The UV-blocking of the treated fabrics increased obviously and ultraviolet protection factor （UPF value） increased from 6. 72 to more than 50, which indicated that the fabrics treated with nano-TiO2 obtained excellent anti-ultraviolet properties.