Abstract
Three new silica gel-immobilized calix[4]arene polymers 9–11 have been prepared via modification of calix[4]arene mono amido derivatives 3–5 with 3-aminopropyl triethoxysilane (APTES) and activated silica gel, respectively. The polymers were characterized by Fourier transform infrared spectroscopy, elemental analysis and thermal gravimetric analysis. The solid–liquid extraction properties of ligands 3–5 along with their immobilized derivatives 9–11 towards dichromate (HCr 2O 7 −/Cr 2O 7 2−) anions were reported. It was found that these calix[4]arene-based polymers have high extraction abilities towards dichromate anions as compared to their monomeric precursors.
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