摘要
Abstract
In the utilization process of nuclear energy and nuclear technology,various radioactive wastewaters are generated,which have important potential impacts on human health and the ecological environment.Cesium-137(Cs-137)is one of the most abundant and hazardous radionuclides in radioactive waste water with the character of a long half-life,high solubility,strong environmental diffusion capability and great difficulty in removal.This study took melamine porous sponge as the skeleton and prepared Prussian blue/carbon nanotube/chitosan-modified melamine porous materials using γ-ray in-situ irradiation technology.Scanning electron microscope,X-ray diffraction spectroscopy were employed to characterize the microscopic morphology,chemical structure,and elemental composition of the composite materials.The research focused on the removal capacity and adsorption behavior of the porous materials for cesium ions in simulated radioactive wastewater,as well as the influence laws of environmental factors(such as coexisting ions,pH,radiation,and temperature)on the adsorption performance.The effects and mechanisms of preparation parameters(including reactant concentration,carbon nanotube content,and irradiation dose)on the morphology,structure,and cesium ion adsorption behavior of the composites were also discussed.Results show that the prepared melamine-based porous composites exhibit excellent adsorption performance for cesium ions in solution which conforms to the Langmuir model and pseudo-second-order adsorption kinetics model with the maximum adsorption capacity of 62.0 mg·g-1.The prepared materials show good radiation stability and thermal stability.Additionally,the adsorbent material has the advantages of light weight,good flexibility and good water absorption.After adsorption,they can be compressed into a small volume for easy storage.The preparation method is simple,effective,and environmentally friendly.Therefore The prepared adsorption materials can be widely applied in the field of radioactive wastewater treatment in the future.关键词
放射性核素/吸附材料/普鲁士蓝/碳纳米管/三聚氰胺多孔材料Key words
radioactive nuclide/adsorption materials/Prussian blue/carbon nanotubes/melamine porous materials分类
化学化工
