详细信息    查看全文

• 作者：Zhi-Xian Wei^a ; ^{zx_wei@126.com} ; Cai-Mei Xiao^a ; Wei-Wei Zeng^a ; Ji-Ping Liu^b ; ^c ; ^{liujp@bit.edu.cn}
• 关键词：Doped perovskire oxides ; Magnetic catalyst ; Visible light photocatalyst ; Methyl orange (MO)
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：370
• 期：Complete
• 页码：35-43
• 全文大小：1321 K

文摘

Perovskite La_0.8Ba_0.2Fe_0.9Mn_0.1O_3?¦Ä and LaFe_0.9Mn_0.1O_3?¦Ä were synthesized and characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), vibrating sample magnetometer (VSM), UV-vis absorption spectra and X-ray photoelectron spectroscopy (XPS) techniques. The magnetic properties of the La_0.8Ba_0.2Fe_0.9Mn_0.1O_3?¦Ä and LaFe_0.9Mn_0.1O_3?¦Ä were measured, and they were also evaluated for their photocatalytic activity toward the degradation of methyl orange (MO) under the sunlight irradiation. The effect of various parameters such as pH and irradiation time on the efficiency of photocatalytic degradation MO was studied. The experimental results show that the magnetic property of the La_0.8Ba_0.2Fe_0.9Mn_0.1O_3?¦Ä and LaFe_0.9Mn_0.1O_3?¦Ä was caused by the double exchange between Mn³⁺ and Fe³⁺, Mn³⁺ and Mn⁴⁺ as well as the defective state in them, the Ba-doping LaFe_0.9Mn_0.1O_3?¦Ä, i.e., La_0.8Ba_0.2Fe_0.9Mn_0.1O_3?¦Ä, has higher magnetic property than that of LaFe_0.9Mn_0.1O_3?¦Ä because of its higher Mn⁴⁺ content which favors the double exchange interaction between Mn⁴⁺and Mn³⁺, and it has much higher photocatalytic activities than those of the LaFe_0.9Mn_0.1O_3?¦Ä due to its higher oxygen vacancies, higher Mn⁴⁺ content and higher visible light absorption. This new bifunctional La_0.8Ba_0.2Fe_0.9Mn_0.1O_3?¦Ä is extremely effective for the MO degradation, and it was easily separated by applied magnetic field and can be reusable and maintain relatively high activity.