The fabrication of a nanoscale polyoxometalate based magnetic adsorbent and its selective adsorption on cationic dyes

摘要

Amino group-functionalized Fe3O4 is loaded on a coordination complex-modified polyoxometalate nanoparticle. In this composite material, Fe3O4 and coordination complex-modified polyoxometalate are connected with intense hydrogen bonds as suggested by FTIR. This composite material exhibits excellent methylene blue (MB) adsorption, with adsorption capacity of 175.5mgg(-1). It also possesses selective separation ability between cationic and anionic dye molecules. In binary solution of MB and methyl orange (MO), MB adsorption efficiency reaches 75%, but it exhibits almost no effect on the adsorption of methyl orange. The saturation magnetization value of this composite material is 18.89emug(-1), allowing magnetic separation, which facilitates the recycle and reuse of this composite adsorbent.