Study On The Separation Performance And Mechanism Of Molybdenum Sulfide And Its Derivatives For Uranyl Ions

Modern society has entered the stage of high-speed consumption of energy.Whether it is the storage of traditional energy sources or its safety issues has brought many difficulties to the development and utilization of society.Nuclear energy is currently a new energy source that can reach industrial applications worldwide and is expected to replace traditional energy sources.However,once the radioactive waste generated by nuclear energy applications is leaked or improperly handled,it will pose a huge threat to the earth's environment and organisms.In the use of nuclear energy,a large proportion of uranium is used,and its decay products are the main pollutants in the ecological environment.Therefore,the efficient adsorption of uranium is of great significance.The research on sulfide adsorption of uranyl ions has made great progress.This paper intends to explore the adsorption properties and mechanism of uranyl ions using molybdenum sulfide and its derived materials.The specific research in this paper is as follows:?1?Synthesis of NO₃-Ppy precursor by oxidative polymerization,and then synthesize MoS₄-Ppy composite with?NH₄?₃MoS₄ chemical agent.The new adsorbent is used to simulate the treatment of uranium-containing wastewater pollution.Through SEM,TEM and other characterization methods,it was found that its morphology was similar to that of polypyrrole,and they were closely arranged in small spheres.The experimental results show that MoS₄-Ppy can effectively remove uranium from radioactive wastewater.The maximum adsorption of U?VI?by MoS₄-Ppy composite is 350 mg/L.In the case of competing ions(Na⁺,Ba²⁺,Zn²⁺,etc.),the adsorption capacity of the material can also reach 269 mg/L,MoS₄-Ppy composites have good application prospects in water pollution treatment.?2?MoS₂ was synthesized by hydrothermal method,and modified with phytic acid?IP6?to obtain the final composite material MoS₂-IP6 NRA/CC.MoS₂-IP6NRA/CC composites have good layered structure,large specific surface area,and rich functional groups?such as hydroxyl and phosphonic acid groups?.When it was applied to the treatment of uranium-containing wastewater pollution,the adsorption reached equilibrium in about 4 hours,and the maximum adsorption capacity of uranyl ion reached 180 mg/L.After 4 cycles of adsorption,desorption and re-adsorption experiments,the adsorption capacity of MoS₂-IP6 NRA/CC can still reach 153 mg/L,indicating that the composite material has good recovery compared with traditional materials.In the adsorption experiment It is easy to separate later,can be effectively reused,and is environmentally friendly.It is expected to be used in the field of treating environmental wastewater.?3?The molybdenum powder is reacted with hydrogen peroxide and nickel acetate to form a solution precursor,and then the wood chips are immersed in the solution and fired in a tube furnace to form the final adsorption material Mo₂C-Wood.In this material system,porous wood has a large specific surface area and is a good matrix material,which can make Mo₂C be wrapped into the porous wood well.The modified new material experiment is used to simulate the treatment of uranium-containing wastewater pollution.The adsorption capacity of the material for U?VI?can reach an adsorption capacity of 489 mg/L at a pH of about 5.5.At the same time,Mo₂C-Wood can float on the surface of wastewater,which is easy to separate and reuse.At the same time,Mo₂C-Wood can be prepared on a large scale.Because of these advantages,the Mo₂C-Wood material has made good progress in practical applications and can quickly and efficiently remove uranium from polluted wastewater.