Preparation of SrTi_0.1Fe_0.9O_{3?span style='font-style: italic'>¦Ä} and its photocatalysis activity for degradation of methyl orange in water

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• 作者：Hong-Xia Chen^a ; Zhi-Xian Wei^a ;   ; ^{zx_wei@126.com} ; Yan Wang^a ;   ; ^b ; Wei-Wei Zeng^a ; Cai-Mei Xiao^a
• 关键词：A. Semiconductors ; B. Chemical synthesis ; C. Electron microscopy ; D. Oxidation
• 刊名：Materials Chemistry and Physics
• 出版年：2011
• 出版时间：1 November 2011
• 年：2011
• 卷：130
• 期：3
• 页码：1387-1393
• 全文大小：853 K

文摘

Magnetic perovskite-type SrTi_0.1Fe_0.9O_3?i>¦Ä was synthesized by stearic acid gel combustion method. The obtained powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), vibrating sample magnetometer (VSM) and UV-Visible absorption spectrum techniques. Mean valence of Fe ion and the concentration of oxygen vacancies in SrTi_0.1Fe_0.9O_3?i>¦Ä were measured by iodometric method. The magnetic properties of the SrTi_0.1Fe_0.9O_3?i>¦Ä were measured, and the SrTi_0.1Fe_0.9O_3?i>¦Ä was also evaluated for its photocatalytic activity towards the degradation of methyl orange (MO) under the sunlight irradiation. The experimental results show that the SrTi_0.1Fe_0.9O_3?i>¦Ä is the photocatalyst possessing of magnetic property and visible-light activity, i.e., bifunctional photocatalyst. The SrTi_0.1Fe_0.9O_3?i>¦Ä is applicable to the magnetic separation process and also shows excellent photocatalytic activity for the degradation of MO. The optimal conditions for photocatalytic degradation were methyl orange concentration of 20 mg L^? at pH 6.0 with the SrTi_0.1Fe_0.9O_3?i>¦Ä concentration of 7.29 mg L^? for 3 h. In addition, the SrTi_0.1Fe_0.9O₃ is reusable and maintain relatively high activity. This study could point out a potential way to develop new and more active magnetic perovskite-type photocatalysts.