富含光诱导氧空位Bi12O17Br2的制备及其高效光催化固氮性能

采用一步水热法制备了Bi₁₂O₁₇Br₂光催化剂,其平均微片尺寸为1.2μm,比表面积约为29 m²·g^-1。Bi₁₂O₁₇Br₂的禁带宽度为2.42 eV,能够响应可见光。值得注意的是,在光照条件下Bi₁₂O₁₇Br₂表面能够产生氧空位;光诱导氧空位不仅能促进氮气在催化剂表面的吸附,而且对吸附的氮气分子的活化起到至关重要的作用。实验结果表明在可见光照射下,Bi₁₂O₁₇Br₂光催化剂上的氨生成速率为337.6μmol·g^-1·h^-1。在可见光的驱动下,Bi₁₂O₁₇Br₂光催化剂能够实现氮气与水反应生成氨的过程。

Fabrication of Bi12O17Br2 with Efficient Photocatalytic N2 Fixation Boosted by Photoinduced Oxygen Vacancies

Bi₁₂O₁₇Br₂ photocatalyst was prepared through a one-pot hydrothermal method.An average microsheets size of 1.2μm and a high specific surface area of ca.29 m²·g^-1 were observed for Bi₁₂O₁₇Br₂ photocatalyst.Bi₁₂O₁₇Br₂ has a bandgap of 2.42 eV,which can be excited under visible light illumination.The photoinduced oxygen vacancies are easily generated on the surface of Bi₁₂O₁₇Br₂.The N₂ molecules could be captured and activated by oxygen vacancies.An NH₃ generation rate of 337.6μmol·g^-1·h^-1 was detected on Bi₁₂O₁₇Br₂ under visible light irradiation.It demonstrates that the accomplishment of the visible-light-driven photocatalytic for the N₂ photo fixation with H₂O over a Bi₁₂O₁₇Br₂ photocatalyst.