Synthesis and Photocatalytic Activity of F/TiO2 Nanocrystals with Exposed (001) Facets via a Nonhydrolytic Solvothermal Route

F/TiO2 nanocrystals with exposed (001) facets were synthesized by a nonhydrolytic solvothermal route. The influence of F ions on the formation process was investigated in detail. The F ions function as a crystal-face directing agent and a stabilizing agent. The photocatalytic activities of the F/TiO2 and commercial P25 samples were determined by the degradation of methyl orange. The influencing factors and active species in the degradation process are discussed after particular characterization and experiments with different scavengers.

摘要摘要：采用非水体系溶剂热法制备了 (001) 面暴露的锐钛矿相 F/TiO2 纳米光催化剂. 结果表明, F 的掺杂对 TiO2 纳米单晶的形成影响很大. 一方面, F 离子作为晶面导向剂稳定 (001) 晶面, 形成 (001) 面暴露的锐钛矿相 TiO2; 另一方面, F 离子也起到稳定剂作用, 抑制纳米粒子的快速生长. 以光催化降解甲基橙为模型反应比较了不同 F/TiO2 样品和商业 P25 样品的光催化活性. 同时, 通过选用不同捕获剂, 研究了 F/TiO2 和 P25 样品在甲基橙降解反应中的活性物种.

A green solvothermal route is proposed for the synthesis of F/TiO2 nanocrystals with exposed (001) facets and with high photocatalytic activity induced by photogenerated holes, ·OH, and ·O2− active species.Figure optionsDownload as PowerPoint slide