Research On Radiation Preparation Of Prussian Blue Composites And Their Adsorption Properties For Cesium Ion

The rapid development of the nuclear power industry and the widespread application of nuclear technology have produced important economic and social benefits.Nuclear energy and nuclear technology will produce various radioactive waste liquid in the process of utilization,which will bring potential threat to ecological environment and human health.Safe and efficient treatment of radioactive wastewater is a prerequisite for the healthy and sustainable development of the nuclear industry,it has urgent needs and significance.Based on the actual needs,this thesis conducts research work on Prussian blue composite adsorption materials and their radiation preparation technology.The composite materials were designed and prepared,their microstructures were characterized.The adsorption properties and rules of composite materials for cesium ions were mainly investigated.Its synthesis and adsorption mechanism were explored,which provided the basis for the design,development and practical application of new radioactive ion absorbing materials.The main research contents and results of this thesis are as follows:?1?Prussian blue nanoparticles with uniform particle size distribution and good dispersion were successfully prepared on the porous sponge skeleton by in situ radiation chemical method.The prepared PB@PUS composites have good selective adsorption performance for cesium ions in a wide pH range,and its maximum adsorption capacity and removal efficiency reach 68.6 mg g^-1 and 99%,respectively.The adsorption process can be described by the Langmuir isotherm adsorption model and the pseudo-secondary adsorption kinetic model.Dynamic adsorption experiments show that the breakthrough time and depletion time of the fixed-bed column are closely related to the PB content in PB@PUS,the solution flow rate and the initial concentration of cerium ions.The penetration curve can be well fitted by the Thomas and Yoon-Nelson models.?2?Facile synthesis of Prussian blue with various morphologies via a radiation-assistant single source method.The results show that the concentration of the precursor K₄[Fe?CN?₆]·3H₂O and the solution pH value are important factors affecting the morphology of the product.Prussian blue nanoparticles with good morphology and distribution were obtained by optimizing the synthesis conditions.The prepared Prussian blue particles have good adsorption performance for cesium ion.The adsorption process is in accordance with the Langmuir isothermal adsorption model,and the maximum saturated adsorption capacity is up to 166.8 mg g^-1.?3?Prussian blue was synthesized on the three-dimensional porous carbon felt matrix by?-ray radiation technique.The electroactive Prussian blue/carbon felt composite electrodes were prepared and their microstructure,electrochemical properties and adsorption properties were tested.The results show that the carbon felt treated by sulfuric acid radiation is more conducive to the deposition of PB nanoparticles and the formation of PB film.Compared with D-PB/CF,S-PB/CF has better reversibility,stability and cycle life.The S-PB/CF film electrode has excellent ESIX performance in the two-electrode system.The addition of the reduction voltage can significantly increase the adsorption efficiency of the film electrode to Cs⁺.When the voltage is 10 V and the initial concentration is 200 mg L^-1,the removal rate is as high as 90%.The adsorption process of S-PB/CF can be described by Langmuir model and pseudo-secondary adsorption kinetics model.The maximum saturated adsorption capacity is 987.5 mg g^-1,which can reach the adsorption equilibrium within 1.5 h.The reverse oxidation voltage desorption rate of the film electrode is close to 90%,and it has good regeneration performance.