HBP-NH2调控掺金纳米二氧化钛的制备及其光催化性能研究

摘要

利用端氨基超支化聚合物(HBP-NH2)在调控制备纳米二氧化钛时,同步实现了纳米金的掺杂,制备了具有高效光催化活性的掺金纳米二氧化钛(Au-TiO2).比较研究了凝胶-水热法制备的纯纳米 TiO2 和经 HBP-NH2 调控制备的纳米 Au-TiO2 在结构和性能上的差别.结果表明:掺金前后的纳米 TiO2 粒径均在 10～20 nm,HBP-NH2 在调控掺杂纳米金的同时,能够明显改善纳米 TiO2 颗粒的分散性能.随着 Au/Ti元素摩尔比增加,掺金含量以及纳米 TiO2 的光催化性能均逐渐增加且趋向于平衡.掺金纳米 TiO2 对刚果红和亚甲基蓝的降解率分别能达到 99％和 98％.%In this paper,Au nanoparticles were doped simultaneously to prepare Au-TiO2 with high photocatalytic activity during the preparation of TiO2 nanoparticles regulated by amino-terminated hyperbranched polymer(HBP-NH2).The structures and properties of pure TiO2 nanoparticles prepared by sol-gel hydrothermal method and Au-TiO2 regulated by HBP-NH2 were compared.The results show that the sizes of TiO2 nanoparticles before and after Au doping are 10～20 nm,and HBP-NH2 can obviously improve the dispersibility of TiO2 nanoparticles during regulating Au nanoparticles.With the increase of molar ratio of Au/Ti,the content of doped gold and the photocatalytic properties of TiO2 nanoparticles increase gradually,and then tend to equilibration.The degradation rates of Au-TiO2 can reach 99％and 98％for congo red and methylene blue,respectively.