New hybrid chelating sorbents with grafted 3-aminopropionate groups based on mixed silicon,aluminum,titanium,or zirconium oxides

摘要

A series of new hybrid organo-inorganic sorbents with the 3-aminopropionate chelating group was synthesized.The synthesis includes the copolycondensation(sol-gel method)of tetraethoxysilane,3-aminopropyltriethoxysilane,and several modifiers(MeSi(OEt)_3,EtSi(OEt)_3,Ti(OEt)_4,AlONO_3,ZrOCl_2)followed by carboxyethylation with acrylic acid.The obtained chelating sorbents were characterized by elemental analysis,FT-IR and ~1H NMR spectroscopy,and thermogravimetry.The N-carboxylated sorbents have a higher sorption capacity with respect to metal ions(0.5-0.9 mmolg~(-1),pH 6.3,NH_4OAc,20 deg C)than the starting sorbents with the primary amino group(0.05-0.2 mmol g~(-1))and manifest high selectivity for copper(II)ion extraction.