Efficient Capture of Radioactive Strontium from Water Using Magnetic WO3 Assembled on Grapheme Oxide Nanocomposite

摘要

Novel core-shell magnetic Fe3O4@WO3@GO nanocomposites were synthesized and used to remove radioactive strontium from aqueous solution. Taking advantage of the combined benefits of GO and magnetic WO3 nanoparticles, Fe3O4@WO3@GO nanocomposites exhibited excellent adsorption capability for removing Sr~(2+). Results for Sr~(2+) adsorption on Fe3O4@WO3@GO have a good fit with a Langmuir isotherm and a pseudo-second-order kinetic model. The maximum adsorption capacity is 61.42 mg g~(-1), which is higher than that of other similar adsorbents. The high adsorption capacity of Fe3O4@WO3@GO can be attributed to the good dispersion of magnetic WO3 on the surface of GO, efficiently reducing the aggregation of nanoparticles and enhancing the probability for contact between adsorbent and adsorbate. In addition, the Fe3O4@WO3@GO nanocomposites exhibited excellent reusability, after 5 uses there was no noticeable loss in adsorption capacity. Thus, this type of nanocomposite to hold excellent is promising for clean-up of radioactive strontium from wastewater.