نوع مقاله : مقاله پژوهشی
1 گروه شیمی معدنی- دانشکده شیمی- دانشگاه علم و صنعت ایران
2 دانشگاه علم و صنعت ایران- دانشکده شیمی
3 دانشکده فناوری های نوین- دانشگاه علم و صنعت ایران
عنوان مقاله [English]
Recently, the degradation of organic pollutants using novel semiconductors with strong absorbance for broad ranged visible lights has generated broad interest of photocatalysis. In the last few years, perovskite-type bismuth ferrite (BiFeO3, BFO) has received a lot of attention. BiFeO3 is one of the rare well-known multiferroic compounds with a rhombohedrally distorted perovskite structure of space group R3c that exhibits ferroelectric and antiferromagnetic properties at room temperature. The narrow band gap and high chemical stability of BiFeO3 make it an effective photocatalyst in the visible light region during the photocatalytic process. BiFeO3 nanopowder was synthesized via a microwave-assisted combustion method by using acetic acid as fuel, for the first time. The structural characterization showed that BiFeO3 was almost pure perovskite type. A ferromagnetic hysteresis loop with a saturation magnetization (MS) of 0.66 emu/g has been observed at room temperature in the sample. The small band gap (=2.08 eV) of prepared BiFeO3 indicates a possibility of utilizing much visible light for photocatalysis. Photocatalytic test for degradation of methyl orange dye indicated that BiFeO3 exhibited high photocatalytic activity.