压电协同光催化降解咪唑类离子液体

Piezoelectric synergistic photocatalytic degradation of imidazolium ionic liquids

借助双Z型三元催化剂Ag I/Ag_(3)PO_(4)/Ba Ti O_(3)在压电协同光催化条件下高效降解离子液体,该催化剂在120min内对1-己基-3甲基咪唑四氟硼酸盐的去除率可达87.3%,表观速率常数是最佳二元催化剂的1.7倍.淬灭实验结果进一步证明了压电效应对光催化的协同作用,并发现·O^(2-)和h^(+)是降解1-己基-3甲基咪唑四氟硼酸盐的主要活性物质.Ag I/Ag_(3)PO_(4)/Ba Ti O_(3)具有较好的稳定性和重复利用性,3次循环后仍有80%以上的降解率.Ag I/Ag_(3)PO_(4)/Ba Ti O_(3)所具有的双Z型结构可以额外提供电子通道,提高光生载流子的传递速率.此外,压电作用下产生的内置电场能够提高电子-空穴分离效率,从而具有高效降解污染物的能力.

Ionic liquids were efficiently degraded under piezoelectric synergistic photocatalytic conditions using a dual Z-type ternary catalyst,Ag I/Ag_3PO_(4)/BaTiO_(3),which was able to degrade 1-hexyl-3methylimidazolium tetrafluoroborate up to 87.3%in 120min with an apparent rate constant of 1.7 times that of the best binary catalyst.The results of quenching experiments further demonstrated the synergistic effect of piezoelectric on photocatalysis,·O^(2-)and h~+were main active substances for the degradation of1-hexyl-3methylimidazolium tetrafluoroborate.Ag I/Ag_3PO_(4)/BaTiO_(3)has good stability and reusability,and the degradation rate is still more than 80%after three cycles.The double Z-type structure of Ag I/Ag_3PO_(4)/BaTiO_(3)can provide additional electron channels and improve the transfer rate of photogenerated carriers;in addition,the built-in electric field generated by piezoelectricity can improve the electron-hole separation efficiency,which provides the high efficiency in the degradation of the piezoelectricity is the most efficient way to degrade pollutants.