Synthesis Of Magnetic K₂Zn₃[Fe?CN?₆]₂@Ni-P Composite And Its Adsorption Ability

Radioactive cesium is a fission by-product in nuclear power plants and has been involved in a number of nuclear accidents.Cesium radioisotopes can significantly contaminate the aquatic environment due to their long half-life and high radioactivity.In addition,as member of the alkali metal family,cesium radioisotopes are mostly in the form of Cs⁺,which guarantees high solubility and mobility in water and high transferability into the biosphere.Once ingested by humans,cesium can be accumulated in the gut and distributed throughout the soft tissues,creating an internal hazard and resulting in diseases such as thyroid cancer.Therefore,the nuclear industry and institutions must find an effective and highly selective method to separate cesium from aquatic solutions.K₂Zn₃[Fe?CN?₆]₂@Ni-P?KNiP?composites with high cesium selectivity were synthesized for the first time.Nickel phosphorus?NiP?was used as a solid base for the adsorption of K₂Zn₃[Fe?CN?₆]₂?KZnHCF?.The synthesized KNiP composites were characterized by SEM,TEM,XRD,VSM and BET techniques.The characteristic results demonstrate that the composites possess ball-shape structure,large surface area of 305.031 m²/g and high saturation magnetization of 2.95 emu/g.KNiP showed good cesium adsorption performance over a wide pH range,and high selectivity for cesium over coexistent competing ions.Dynamics showed that KNiP has a good adsorption performance towards cesium,with an adsorption capacity of 54.95 mg/g.Equilibrium was achieved within only two hours and the experimental data fitted the Pseudo second-order model,indicating the adsorption process belongs to a chemisorption.The adsorption process follows the Freundlich isotherm model,indicating that the adsorption process mainly happened on a heterogeneous surface.