High-efficiency continuous enrichment of cesium ions using CuFC composite microspheres. Dynamic adsorption and mechanism analysis

In this study, we proposed a novel multi-walled carbon nanotubes (MWCNT) doping strategy. Based on the composite cross-linking effect, CuFC was encapsulated by Calcium alginate (CA), and Polyvinyl alcohol (PVA), and MWCNT were introduced into the pellet-forming process to form composite microsphere with excellent mechanical strength. The composite microsphere was characterized by FT-IR, XRD, SEM, EDS and XPS spectrometry. The composite microsphere filled column has excellent adsorption performance and can be used for continuous adsorption of Cs⁺. The dynamic adsorption behavior was well fitted by the Thomas model and the Yoon-Nelson model. Therefore, CuFC composite microsphere has promising potential for Cs⁺ continuous adsorption from radioactive wastewater. (author)