Enhanced Removal Of Heavy Metals In Waters By Polymer-supported Zirconium Oxide Nanocomposite Adsorbent

In this thesis, a novel hybrid sorbent Zr O2-001 was prepared and also examined and the selective adsorption properties toward Pb2+ and Cu2+ were elucidated based on Donnan membrane principle. Subsequently a new modified nanocomposite, namely Zr-Mg-001 was prepared and successfully used to deeply remove trace Cu2+ from water under acidic conditions as compared with Zr O2-001 and D001, which can provide a promising technical choice for safety control of heavy metals in water.In the first section of the work, a new nano-composite absorbent Zr O2-001 was prepared by immobilizing Zr OCl2·8H2O on polymeric porous cation exchange resin through surface deposition technology to investigate the performance on the adsorption of lead ions and copper ions. It was observed that the adsorption performances were effected by the solution p H values, and the optimal p H values for adsorption ranges from 5 to 6.5. The adsorption isotherm can be fitted with the Langmuir model well. The adsorption kinetics can also be represented using pseudo-second-order kinetics model. Comparing to a traditional ion-exchange resin D-001, Zr O2-001 exhibits more preferable adsorption behavior toward Pb2+ and Cu2+, even present competition of Ca2+ Na+、Mg2+at high levels. Additionally, the obtained Zr O2-001 also displayed excellent sorption-degeneration stability at least five cycles.In the second section of this work, a novel modified polymer-based Zr-Mg-001 composite was fabricated by impregnating Zr OCl2·8H2O and Mg(NO3)2 onto large pore cation exchange resin(D001), a kind of strongly acidic cation exchanger with sulfonic group, which can trackle the problems stated above. It was observed that the zirconium oxides and hydroxyl magnesium oxides(Zr O2 and Mg(OH)2) particles loaded in the channels or pores of D001 was amorphous. By studying the adsorption properties and mechanism of the typical heavy metal copper ions under acidic conditions revealed that the solutions p H had an influence on the adsorption of copper and the process was less affected by temperature changes. A lot of calcium ions in water had a significant influence on adsorption performance, but it still exhibited excellent adsorption performance as compared with Zr O2-001 and D001. In terms of processing capacity, the amount of processing of Zr-Mg-001 was three times than Zr O2-001 under the same conditions, whch can achieved better treatment effect under acidic conditions.