Development of visible-light response photocatalyst by selective modification on specific exposed crystal faces with metal ions modification on specific exposed crystal faces with metal ions

{111}利用铁（III）/铁（II）（Fe ^<3+>/ Fe^<2+>）离子的吸附特性，用三价铁（III）（Fe ^<3+>）离子对形状可控的金红石型氧化钛（TiO_2）的暴露晶面进行位置选择性修饰。Fe^<3+>离子选择性修饰的金红石型TiO_2在可见光照射下表现出很高的光催化活性，这是由于氧化还原中心的分离，即Fe^<3+>离子的选择性修饰导致的。例如，氧化和还原分别发生在{111}面的Fe^<3+>离子和{ 110}面的TiO_2裸表面上。

{111} exposed crystal faces of shape-controlled rutile titanium(IV) oxide(TiO_2) were site-selectively modified with trivalent iron(III)(Fe^<3+>) ions by utilizing adsorption property of iron(III)/ iron(II)(Fe^<3+>/ Fe^<2+>) ions. The rutile TiO_2 with site-selective modification of Fe^<3+> ions showed high photocatalytic activity under visible-light irradiation as a result of separation of redox sites, i. e., oxidation and reduction proceed over Fe^<3+> ions on{ 111} faces and the bare TiO_2 surface on{ 110} faces, respectively.