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为了获得新型的窄带隙半导体BiFeO3,以硝酸铁、硝酸铋为主要原料,以无水乙醇和冰醋酸为溶剂,采用溶胶-凝胶法制备干凝胶,然后将干凝胶在氮气条件下、马弗炉中煅烧1h得到BiFeO3粉末样品。采用X射线衍射光谱(XRD)、差热(DTA)分析和漫反射吸收谱(DRS)对BiFeO3的物性进行表征,并以偶氮染料甲基橙作为模拟污水研究BiFeO3的可见光催化性能。结果表明:BiFeO3接近纯相、在832℃附近有一个相变峰,带隙为2.03eV,具有良好的可见光催化活性,是一类具有广泛应用前景的新型窄带隙半导体可见光催化剂。
In order to obtain a new type of narrow band gap semiconductor BiFeO3, using iron nitrate, bismuth nitrate as the main raw material, using anhydrous ethanol and glacial acetic acid as solvent, a sol-gel method was used to prepare the xerogel, then the xerogel was dried under nitrogen, Calcination 1h in a muffle furnace gave a BiFeO3 powder sample. The properties of BiFeO3 were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and diffuse reflectance absorption spectroscopy (DRS). The visible light photocatalytic activity of BiFeO3 was also studied using azo dye methyl orange as a simulated wastewater. The results show that BiFeO3 has a near-pure phase with a phase transition peak at 832 ℃ and a band gap of 2.03eV. It has good visible light catalytic activity and is a new type of narrow-bandgap semiconductor visible light catalyst with wide application prospect.