CALIX4ARENE POLYMER, ITS PRODUCTION, AND SEPARATION OF DIVALENT LEAD ION USING SAME

摘要

PROBLEM TO BE SOLVED: To obtain a calix[4]arene polymer having improved selectivity for lead ions by mixing a calix[4]arene with trioxane and acetic acid under heating, adding a sulfuric acid/acetic acid mixture to the reaction mixture, cooling the entire mixture, and adding an aqueous sodium hydrogencarbonate to the mixture to form a precipitate.;SOLUTION: A mixture obtained by mixing a calix[4]arene of formula I with trioxane and acetic acid is heated under agitation. A sulfuric acid/acetic acid mixture is added to the mixture, and the resulting mixture is heated under agitation and then cooled. An aqueous sodium hydrogencarbonate solution is added to the mixture to obtain a calix[4]arene polymer having repeating units of formula II. In the formula, unbonded valences are bonded to other calix[4]arene moieties to form a reticular structure in which the benzene rings of calix[4]arene moieties are bonded to each other through methylene groups. The number of repeating units is 10-100. The calix[4]arene polymer is useful for effectively separating, removing, and recovering lead ions from a lead-ion- containing aqueous solution.;COPYRIGHT: (C)2000,JPO