Adsorption Characteristics And Mechanism Experimental Study On Uranium(?) By Composites Of Carbon Nanotubes And Cycdextrin

Treatment of low uranium-concentration wastewater from nuclear industry by adsorption,to reduce water pollution from nuclear industry.Explore the efficient means of managing uranium-containing wastewater,and provide the theoretical basis for the treatment of uranium-containing wastewater.In this paper,carbon nanotubes and hydroxypropyl-?-cyclodextrin as raw materials,MWNTs-?-CD and magnetic MWNTs/?-CD were synthesized.The effects of pH value,The initial concentration of U(?),contact time,temperature and adsorbent dosage of U(?)were investigated by static adsorption experiment,Experiments show that both materials can be reused,Finally,explore the adsorption mechanism by the adsorptionkinetics,thermodynamicanalysisandmaterial characterization.The experimental results of U(?)adsorption on MWNTs-?-CD show tha,pH=5,uranium concentration of 10mg/L,The adsorption equilibrium time is 60 min,The temperature is 25?,The adsorption capacity of MWNTs and MWNTs-?-CD to U(?)was 9.6mg/g and18.36mg/g,respectively.The second-order kinetics and Langmuir model(R~2>0.99)can better fit the adsorption process of MWNTs-?-CD adsorb U(?).TEM indicates that the carboxylated opened from the close state,SEM images show that MWNTs-?-CD surface height difference is reduced,the gap is supplemented to a greater extent after adsorb U(?).EDS and FTIR indicate that MWNTs-?-CD in the process of adsorption of U(?),a large number of hydroxyl,carboxyl and other groups play an important role.The experimental results of U(?)adsorption on MMCD show than,pH=6,uranium concentration of 10mg/L,The adsorption equilibrium time is 60 min,The temperature is 25?,The adsorption capacity of MMCD to U(?)was 16.25mg/g.The second-order kinetics and Langmuir model(R~2>0.99)can better fit the adsorption process of MMCD adsorb U(?).SEM images show that MMCD surface height difference is reduced,the gap is supplemented to a greater extent after adsorb U(?).Probably due to the combination of uranyl ions with MMCD surface oxygen-containing functional coordination.EDS showed that the surface U(?)content was significantly increased by MMCD adsorption.