Study On The Preparation And Adsorption Of New Adsorptive Materials For Copper And Uranium

As a common used heavy metal ions, copper(II) was widely used in industryand our life. It leads to serious environmental contamination while transferring theminto the natural resources. In the process of undefiled of nuclear energy, high riskwas hidden around the world. The emission of heavy metal ions and radionuclideuranium was not only environmental contamination but also a waste of resources.Therefore, while treating the wastewater, the recycling should also be considered.There were many treatment of wastewater, among all methods, adsorption wasdemonstrated to fulfil both purpose. Active carbon spheres prepared with glucosethrough hydrothermal synthesis method, as a new type adsorbent, it was treated asgreen, non-toxic, non-secondary pollution. Therefore, it would be a potential highefficiency adsorbent. ArsenazoIII has strong complexation with uranyl ion, there cansynthetize a new uranyl adsorption material by the treatment of hydrophobicprotection.Objective:Compared the adsorption of different adsorbents that were prepared withdifferent mole ratio of raw materials in the same condition, then screen out the mosteffective material, that material was chosen to do the adsorption propertiesexperiments. By the static adsorption of copper(II) and uranyl ion onamino-functionalized active carbon, the optimal adsorptive pH was confirmed.Adsorption kinetics and Langmuir were studied. The selective adsorption withimprinted adsorbent and non-imprinted adsorbent was also compared. Theadsorption of uranyl ion on ArsenazoIII@SiO2was explored. Method:Amino-functionalized active carbon spheres were prepared with glucosethrough hydrothermal synthesis method. ArsenazoIII@SiO2was prepared by sol-gelmethod; adsorption of copper(II) on imprinted amino-functionalized active carbonwas studied by ultraviolet-visible spectrometry. Adsorption of uranium onamino-functionalized active carbon was studied by ultraviolet-visible spectrometryand trace uranium analyser. The morphology of amino-functionalized active carbonwas studied by scanning electron microscope and transmission electron microscope.The detection and analysis of amino groups were carried out by both IR and XPSspectroscopy.Result:1.The morphology of amino-functionalized active carbon which was preparedby hydrothermal synthesis method was studied by scanning electron microscope, theparticles were smooth but with nonuniform size. The adsorption of copper for thecopper imprinted amino-functionalized active carbon and tungsten imprintedamino-functionalized active carbon was effected by pH. The selective adsorption ofcopper in mixed metal ions was higher than other metal ions by both imprintedamino-functionalized active carbon.2.Amino-functionalized active carbon has a high adsorption for uranyl ion, inthe study of low concentration adsorption, the adsorption rate was more than99%.3.The adsorption of uranyl ion on arsenazoIII@SiO2was effected by the valueof pH. ArsenazoIII@SiO2adsorbent has a high adsorption of uranyl ion.Conclusion:1.In the study of the adsorption of copper on imprinted amino-functionalizedactive carbon, it was found that amino groups have high complexation with copperions. The selective adsorption of copper was higher than other metal ions in mixedmetal ions by imprinted amino-functionalized active carbon, it was also higher thannon-imprinted amino-functionalized active carbon.2.Amino groups have coordination with uranyl ions, active carbon modified byamino groups could increase the adsorption of uranyl ion. 3.After arsenazoIII coated by SiO2, a new type of adsorbent was synthetized,that new adsorbent was effective to adsorb uranyl ions from aqueous solution.