Polymer supported calix[4]arene-semicarbazone derivation for separation and preconcentration of La(III), Ce(III), Th(IV) and U(VI)

摘要

The new "upper-rim" functionalized 11,23-disemicarbazono-26,28-n-dipropoxy-25,27-dihydroxy calix[4] arene has been synthesized by condensing 11, 23-diformyl-26,28-n-dipropoxy-25,27-dihydroxy calix[4]arene with semicarbazide hydrochlo- ride. This calix[4]arene-semicarbazone derivative was then covalently linked with commercially available Merrifield's peptide resin at the "lower-rim" to obtain polymeric chelating resin and its analytical properties were investigated. The resin was then used successfully for the separation and preconcentration of lanthanum(III), cerium(III), thorium(IV) and uranium(VI) prior to their determination by spectrophotometry and inductively coupled plasma atomic emission spec- troscopy.