Fe3O4纳米磁性微粒对钴和锶的吸附

为降低90Sr和60Co对环境的污染，用共沉淀法制备了粒径为10 nm的Fe3O4磁性微粒，分散于水中生成饱和磁化强度（M）为350 kA/m的水基磁流体，用此磁流体对Co2+， Sr2+进行了吸附研究。结果表明，在45 ℃，吸附60 min时，Co2+， Sr2+分别在pH=7和pH=8下达到吸附平衡，吸附容量为1.794， 0.962 mmol/g。用Langmuir等温模型、假二级动力学模型探讨了Fe3O4纳米磁性微粒对Co2+， Sr2+的吸附机制，研究结果表明，该过程是单离子层吸附过程。

Adsorption of Cobalt and Strontium on Fe3O4 Magnetic Nanoparticles

Adsorption is an efficiency method to decrease the pollution of 90Sr and 60Co. The adsorption behavior of cobalt and strontium on Fe3O4 magnetic nanoparticles was studied in this paper. The adsorbent applied here was prepared by co-precipitation, and can form water based ferrofluids. Its saturation magnetization is 350 kA/m. The experiments show that the Q_max of cobalt and strontium are 1.794 mmol/g and 0.962 mmol/g at pH=7 and pH=8, respectively. The adsorption process follows a pseudo second kinetics and the Langmuir isotherm, which indicates the adsorption is a monolayer adsorption. 