Wang Sai, Xu Xuewen, Luo Han, Cao Chaochao, Song Xiaoyu, Zhao Jianling, Zhang Jun, Tang Chengchun
School of Materials Science and Engineering, Hebei University of Technology Tianjin 300130 P. R. China
RSC Adv. 2018 May 24;8(34):19279-19288. doi: 10.1039/c8ra02121j. eCollection 2018 May 22.
SrTiO/NaTaO (STO/NTO) heterojunction photocatalysts were successfully constructed by decorating NaTaO nanocubes with SrTiO nanoparticles a hydrothermal method. The structure of the perovskites NaTaO and SrTiO bear some resemblance to each other, which increases the interface lattice match for promoting the migration of photogenerated carriers between the STO/NTO interfaces. In comparison to pristine NaTaO and SrTiO samples, the STO/NTO composites exhibited remarkably improved capacity for the degradation of rhodamine B (RhB) under ultraviolet (UV) light ( < 400 nm) irradiation. Furthermore, the partial replacement of O by N in the TaO octahedron narrowed the band gap of NaTaO, which significantly enhanced the photocatalytic performance of the SrTiO/NaTaO:N (STO/NTON) heterojunction under visible light ( > 400 nm). Finally, the possible band structures of the STO/NTO and STO/NTON photocatalysts were proposed, which indicated that an n-n type heterojunction was constructed with a staggered gap for fast separation of photogenerated electron-hole pairs.
通过水热法用SrTiO纳米颗粒修饰NaTaO纳米立方体，成功构建了SrTiO/NaTaO（STO/NTO）异质结光催化剂。钙钛矿NaTaO和SrTiO的结构彼此有些相似，这增加了界面晶格匹配，有利于促进光生载流子在STO/NTO界面之间的迁移。与原始的NaTaO和SrTiO样品相比，STO/NTO复合材料在紫外光（<400 nm）照射下对罗丹明B（RhB）的降解能力有显著提高。此外，TaO八面体中部分O被N取代使NaTaO的带隙变窄，这显著增强了SrTiO/NaTaO:N（STO/NTON）异质结在可见光（>400 nm）下的光催化性能。最后，提出了STO/NTO和STO/NTON光催化剂可能的能带结构，表明构建了具有交错能隙的n-n型异质结，用于光生电子-空穴对的快速分离。
