Fe₃O₄/BiOBr光催化固氮性能研究  

Investigation on the Photocatalytic Performance of Fe3O4/BiOBr of Fixing Nitrogen

作　　者：王小慧 张语珈 潘秋桐 邵明慧 孙海杰 

机构地区：[1]郑州师范学院化学化工学院,河南 郑州

出　　处：《材料化学前沿》2025年第1期48-57,共10页Advances in Material Chemistry

基　　金：国家级大学生创新创业训练计划项目(202412949003),郑州师范学院大学生创新创业训练计划项目(DCZ2023007)。

摘　　要：本文先以FeCl3与FeSO4∙7H2O为原料采用氨水为沉淀剂共沉淀制备了Fe3O4,再以Bi(NO3)3∙5H2O与KBr为原料加入Fe3O4采用水热法制备了不同含量Fe3O4复合BiOBr催化剂。并用X射线衍射仪、紫外–可见光谱漫反射仪和电化学工作站等仪器研究了催化剂的物相、吸光性能和阻抗,并考察了Fe3O4/BiOBr光催化固氮性能。结果表明,随着Fe3O4含量的增加,复合催化剂的吸光能力增强,带隙减小,阻抗减小,使光生电子移动速率加快,催化剂的平带电位减小,催化剂的还原能力增加,更易活化氮分子,更易与氢离子生成铵根离子,Fe3O4/BiOBr固氮性能越高。当反应时间为130 min,BiOBr与Fe3O4的物质的量之比为1:0.5,催化剂的质量为0.2 g时,Fe3O4/BiOBr光催化固氮性能最好,催化剂的效率为10.51 μg∙g−1∙min−1。In this paper, Fe3O4 was prepared by co-precipitation of FeCl3 and FeSO4∙7H2O with ammonia as the precipitant, and then Fe3O4 composite BiOBr catalysts with different contents of Fe3O4 were prepared by hydrothermal method with the addition of Fe3O4 from Bi(NO3)3∙5H2O and KBr as the raw materials. The physical phases, light-absorbing properties and impedance of the catalysts were also investigated by X-ray diffractometer, UV-visible spectral diffuse reflectometer and electrochemical workstation, and the photocatalytic nitrogen fixation performance of Fe3O4 composite BiOBr was examined. The results showed that with the increase of Fe3O4 content, the light-absorbing ability of the composite catalyst was enhanced, the band gap was reduced, the impedance was reduced, so that the rate of photogenerated electron movement was accelerated, the flat-carrying potential of the catalyst was reduced, the reducing ability of the catalyst was increased, it was easier to activate the nitrogen molecules, it was easier to generate ammonium root ions with the hydrogen ions, and the higher the nitrogen fixation performance of the Fe3O4 composite BiOBr was. The photocatalytic nitro

关 键 词：四氧化三铁 溴氧化铋 光催化 固氮 

分 类 号：O64[理学—物理化学]