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

利用Fe(III)/Fe(II)(Fe^&lt；3+&gt；/Fe^&lt；2+&gt；)离子的吸附性能，用三价Fe(III)(Fe^&lt；3+&gt；)离子对金红石型氧化钛(TiO2)的{111}裸露晶面进行了选择性修饰。Fe~(2+)~(3+)和Gt~(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较高的光催化活性，这是由于氧化还原中心的分离，即氧化和还原分别在{111}面上的Fe~(2+)和{110}面上的裸露表面进行。

{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.