氢氛还原法制备氧化铁/膨润土复合材料及其表征研究

Preparation and characterization of Fe_3O_4/bentonite composite material by hydrogen atmosphere reduction method

以膨润土和硝酸铁为原料,采用氢氛还原法制备Fe_3O_4/膨润土复合材料,并采用X射线衍射(XRD)、扫描电子显微镜(SEM)和电子能谱(EDS)做表征分析。通过实验得到最佳的工艺条件:n(OH^-)∶n(Fe^(3+))=1∶1、铁土比为10 mmol/g、还原温度为200℃、还原时间为30 min。制备的Fe_3O_4/膨润土具有良好的类Fenton催化性能、稳定性与磁分离性能。制备过程中铁元素化合物能够有效固载在膨润土上,并在氢气还原作用下转化为Fe_3O_4,所得Fe_3O_4/膨润土是结构分散、孔隙明显、物化形态优良的催化复合材料。

Fe3O4/bentonite composite material was prepared by hydrogen atmosphere reduction method with bentonite and ferric nitrate as raw materials,and the Fe3O4/bentonite was characterized by XRD,SEM,and EDS.Results showed the optimum process conditions for preparation of Fe3O4/bentonite were as follows：n（OH^-）∶n（Fe^3＋）=1∶1,ratio of Fe to bentonite was 10 mmol/g,reduction temperature was 200 ℃,and reduction time was 30 min.Fe3O4/bentonite prepared by hydrogen atmosphere reduction method had good Fenton-like catalytic activity,stability,and magnetic separation performance.Iron compounds were effectively immobilized on bentonite and converted to Fe3O4 by hydrogen reduction during preparation process,and the prepared Fe3O4/bentonite was a catalytic composite material with decentralized structure,obvious pores and excellent morphology.