Ho^(3+)掺杂铁酸铋的制备及光催化性

Preparation and Photocatalytic Properties of Ho^(3+) Doping BiFeO_3

为提高铁酸铋磁性和光催化性能,通过低温热分解前驱体快速制备出可磁分离回收的Ho^(3+)掺杂铁酸铋复合物Bi_(0. 95)Ho_(0. 05)FeO_3纳米颗粒,并用X粉末衍射仪(XRD)、傅里叶红外变换光谱仪(FT-IR)、紫外可见漫反射光谱仪(DRS),磁强计(VSM)和Zeta电位仪等多种手段对物相和性质进行表征,同时以甲基橙(MO)为降解模型,考察溶液的酸碱性和常见无机阴离子共存下其光催化性能。结果显示,产物以R3c相铁酸铋为主,带隙为1. 90 eV,Ho^(3+)掺杂后使铁酸铋的磁性增强了4倍,催化性能提高30%。而该催化剂的催化性能受降解溶液本身酸碱性以及共存阴离子的氧化性与酸碱性的影响。另外,对该催化剂的回收也进行了研究。结果表明,所得催化剂可通过磁分离回收,从而反复利用。

In order to improve photocalytic property and enhance magnetism of BiFeO 3(BFO),nano-sized Bi 0.95 Ho 0.05 FeO 3(BHFO)particles were prepared through thermal decomposition of coordination precursor at 500℃.The material obtained was characterized by X-ray diffractometer(XRD),Fourier transfom infrared(FT-IR)spectrometer,dynamic reflectance spectrometer(DRS),vibrating sample magnetometer(VSM),and Zeta potential analyser.It exhibits rhombohedral R3c phase with a band gap of 1.90 eV,and its magnetism is 5 times stronger than BFO.With methyl orange(MO)as the degradation model,the influence factors on photocatalytic activity of BHFO was found to be affected by the oxidization and acid-base property of anions.At last,BHFO exhibits good photocatalytic stability and can be recovered by magnetical separation.