FeBiO_3的制备及光催化氧化性能研究  

Preparation of Bismuth Ferrite Composite Oxide and Its Photocatalytic Performance

作　　者：张鹏飞[1] 姚俊雄 邓洪权[1] 蒋琪英[1,2] 胡亚敏[1] 沈娟[1] 

机构地区：[1]西南科技大学材料学院 [2]西南科技大学生物质材料教育部工程研究中心,四川绵阳621010

出　　处：《环境科学与技术》2015年第4期6-10,共5页Environmental Science & Technology

基　　金：国家自然基金青年基金(21301142);四川省教育厅重点科研项目(14ZA0101);西南科技大学大学生创新基金(CX13-028)

摘　　要：以多胺羧酸（H5dtpa）为配体获得同时含铋和铁双金属配合物的配位分子前驱体,通过低温热分解前驱体制得Fe-Bi-O三元复合纳米氧化物粉末。采用XRD、SEM、Uv-Vis DRS、PL以及VSM等方法对所得复合氧化物进行结构和性质表征。结果表明所制备的复合物粒径在100 nm左右,主相为Fe Bi O3,在室温时表现出弱铁磁性,其弱磁性可能来自Fe Bi O3的尺寸限域效应。该复合物在200~600nm范围对光具有较强的吸收,其直接带隙λeg=2.02 e V。另外,分别以甲基橙和苯酚为降解模型,初步研究了其光催化氧化性能,于20 mg/L的弱酸性甲基橙溶液和苯酚溶液中分别添加0.25 g/L制备的Fe Bi O3粉末,甲基橙溶液光照5 h后脱色率为90%,而苯酚溶液光照4 h脱色率达100%。Nano-sized powder of composite oxide BiFOa was prepared by thermal decomposition of the precursor which had been made from diethylene-triamine-penta-acetic acid （Hsdtpa） at a relatively low temperature, and the nano-particles were characterized by instruments including XRD, SEM, Uv-Vis DRS and VSM. The investigation showed that the size of powder prepared was about 100 nm, and the main phase is FeBiO2; the composite oxide possessed a strong ability of light absorption within the wave-length range from 200 to 600 nm and the direct band gap was 2.07 eV according to the absorption band. On the other hand, magnetic measurement indicated the weak ferromagnetic order of BiFeO3 at room temperature, which may be attributed to the size confinement effect. In addition, photocatalytic degradation rate of MO （methyl orange） and phenol solution with addition of the prepared FeBiOa under UV-light irradiation were studied respectively. The decolorized rate of MO is 90% over prepared FeBiO3 of 0.25 g/L under Uv-light irradiation for 5 h. At the same condition, the decolorized rate of Phenol is 100% under Uv-light irradiation for 4 h.

关 键 词：铋-铁 复合氧化物 甲基橙 光催化降解 

分 类 号：X703[环境科学与工程—环境工程]