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以溶胶-凝胶法制备了BiFeO3和BiFeO3/单壁碳纳米管(single-walled carbon nanotubes,SWCNTs)复合粉末。并分别用X射线衍射、紫外和可见光谱及气相色谱分析表征了催化剂的结构、可见光响应性能及催化活性,讨论了碳纳米管改性对催化剂可见光响应性及光催化活性的影响。结果表明:BiFeO3和BiFeO3/SWCNTs均具有较好的可见光响应性及催化活性,碳纳米管的加入不仅可以明显强化铁酸铋的紫外及可见光响应性能,同时可以使BiFeO3光催化还原CO2合成甲醇的性能增加1倍,单位质量BiFeO3/SWCNTs光催化还原CO2合成甲醇的累积产率最高可以在4～6h达到1000μmol/g。
BiFeO3 and BiFeO3 / single-walled carbon nanotubes (SWCNTs) composite powders were prepared by sol-gel method. The structure, visible light response and catalytic activity of the catalyst were characterized by X-ray diffraction, ultraviolet and visible spectroscopy and gas chromatography. The effects of CNTs on the visible light response and photocatalytic activity were also discussed. The results show that both BiFeO3 and BiFeO3 / SWCNTs have good visible light response and catalytic activity. The addition of carbon nanotubes not only can significantly enhance the UV and visible light response of bismuth ferrite, but also can make BiFeO3 photocatalytically reduce CO2 to synthesize methanol The total yield of methanol synthesized by BiFeO3 / SWCNTs photocatalytic reduction of CO2 can reach 1000μmol / g in 4 ~ 6h.