Photoinduced charge property of nanosized perovskite-type LaFeO₃ and its relationships with photocatalytic activity under visible irradiation

详细信息	查看全文 | 推荐本文 |

• 作者：Shudan Li ; Liqiang Jing ; Wei Fu ; Libin Yang ; Baifu Xin ; Honggang Fu
• 关键词：A. Nanostructures ; A. Surfaces ; B. Sol– ; gel chemistry ; D. Catalytic properties ; D. Surface properties
• 刊名：Materials Research Bulletin
• 出版年：2007
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：15 February 2007
• 卷：42
• 期：2
• 页码：203-212
• 文件大小：555 K

摘要

In this paper, ABO₃-type perovskite LaFeO₃ nanosized photocatalysts were synthesized by a sol–gel method, using citric acid (HOOCCH₂C(OH)(COOH)CH₂COOH) as complexing reagent and La(NO₃)₃·6H₂O and Fe (NO₃)₃·9H₂O as raw materials. The as-prepared samples also were characterized by several testing techniques, such as thermogravimetry–differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET), infrared spectrum (IR), ultraviolet–visible diffuse reflection spectrum (UV–vis DRS), photoluminescence spectrum (PL), surface photovoltage spectroscopy (SPS) and electrical field induced surface photovoltage spectroscopy (EFISPS). The sample activity of different LaFeO₃ nanoparticles for degrading Rhodamine B solution under visible irradiation (λ > 400 nm) was evaluated. The effects of thermal treatment temperature on photoinduced charge property and photocatalytic activity were mainly investigated, together with their relationships. The results show that the LaFeO₃ sample calcined at 500 °C exhibits higher activity, and the activity decreases with increasing calcination temperature, which is in good agreement with the characterization results. The weaker is the PL and SPS signal, the higher is the photocatalytic activity. Moreover, the activity of all as-prepared LaFeO₃ samples is higher than that of international P-25 TiO₂ under visible irradiation.