Polymeric pseudocrown ether resins containing azacrown and azathiacrown ethers: Synthesis and adsorption for metal ions

Eight novel polymeric pseudocrown ether (PPCE) resins containing azacrown and azathiacrown ethers were prepared by chemical reactions of the precursor of 1-chloro-2,3-epoxypropane, 1-(2-chloroethoxy)-2,3-epoxypropane, 1-chloro-2,3-epithiopropane, and 1-(2-chloroethoxy)-2,3-epithiopropane with triethylolamine or diethylolamine in the presence of NaH. The maximum adsorption capacities of PPCE resins for noble metals are 4.67 mmol Au/g-resin, 2.2 mmol Pd/g-resin, 0.7 mmol Pt/g-resin, and 7.3 mmol Ag/g-resin. The structure of PPCE resins were characterized by IR spectra and element analysis. The adsorption of PPCE resins for noble metals is jointly conducted by PPCE polymer backbone and the azacrown or azathiacrown cavity. The XPS study shows that there are strong complexion interactions between PPCE and Au(III) or Pd(II).