燃烧快速制备铁酸铋复合氧化物及光催化研究

Bismuth Ferrite Composite Oxide Rapidly Prepared by Combustion and Its Photocatalytic Study

本文采用新型燃烧剂抗坏血酸,燃烧法快速制备铁酸铋的复合氧化物。经XRD考察硝酸铁和硝酸铋物质量之比对复合氧化物的影响,电镜表征复合氧化物的形貌、BET表征复合氧化物的比表面积、紫外和红外表征复合氧化物的吸光性能。以甲基橙为目标降解物对铁酸铋的复合氧化物进行光催化研究。本文考察了复合氧化物类型、催化剂用量、溶液酸度、双氧水用量、光照时间对光催化效果的影响。最佳光催化条件为催化剂用量为0.01 g/L,pH值为5,双氧水用量为60 mL/L。BiFeO3在紫外和可见光下均有较好的光催化效果,Bi2Fe4O9只在紫外光下有较好的光催化效果。

In this paper,ascorbic acid as new combustion agent,the composite oxides of bismuth ferrite were prepared by combustion. This paper investigated the molar ratio of ferric nitrate and bismuth nitrate effected on composites by characterization of XRD. The morphologies of composites were characterized by scanning electron microscopy. The surface area of samples were characterized by BET. The light absorbance of samples were studied by instrument of UV and IR spectra. The photocatalytic properties of composites were studied with Methyl orange as degradation aim. The experiment studied effect of the composite type,amount of catalyst,the pH of the solution,the amount of hydrogen peroxide on the photocatalyst. The optimal photocatalytic conditions were that dose of catalyst was 0. 01 g /L,pH was 5,the amount of hydrogen peroxide was 60 mL /L. BiFeO3 has better photocatalytic properties under UV and visible light,and Bi2Fe4O9 only has better photocatalytic properties under UV light.