The Sorption Study Of Prussian Blue Analog Compound On Cs⁺ And Sr²⁺ In Radioactive Wastewater

With the rapid development of nuclear technology and the utilization of nuclear energy,radioactive pollution problem is more and more prominent.Radioactive waste water is an important part of radioactive pollution,whichhas aroused people's attention.Prussian blue compoundas ion exchangers for radioactive waste water,which has a unique advantagewhen it compared to other materials.Multi-metal Prussian blue analogues,Prussian blue/chitosan/carbon nanotube composites,Prussian blue /carbon nanotube sponges were prepared by co-precipitation,in situ growth,template replication and other methods.The radioactive waste water containing 90 Sr and 137 Cs was simulated with stable strontium chloride and cesium chloride solution,and the adsorption and adsorption mechanism of these three materials on 90 Sr and 137 Cs in radioactive waste water were studied.The main research work and results are as follows:?1?Prussian blue?PBA?was prepared by co-precipitation method.TEM,XRD,FTIR,XRF and M?ssbauer characterized the PBA samples.The adsorption properties and the adsorption mechanism of the samples were studied.The adsorption of Cs⁺ by PBA was mainly due to the exchange of K⁺ and Cs⁺ in the PBA sample,and the microstructure of the sample after adsorption did not change obviously.PBA has good adsorption selectivity for Cs⁺,and the adsorption rate is fast.?2?PBA/CS/CNTs composites were synthesized and characterized by TEM,XRF and FTIR.The absorption of Cs⁺ and Sr²⁺ by PBA/CS/CNTs were much better than that of Sr²⁺.The experimental data was fitting well with Freundlich equation and Redlich–Peterson model.The maximum Cs⁺/Sr²⁺ adsorption capacity of adsorbents was 219.8/205.1 mg·g-1.?3?Three-dimensional porous carbon nanotube sponge was prepared by template replication method.The adsorption of Sr²⁺ on Prussian blue/carbon nanotube sponges was studied by static adsorption experiment.The adsorption process of Sr²⁺ on Prussian blue/carbon nanotube sponge was a chemical adsorption process on the non-uniform surface.The results of this study have some reference value for the development of highly adsorbable,highly selective radioactive wastewater treatment materials and the design of efficient and simple radionuclide removal system.