Global to push GA events into
skip to main content

Title: Polymer-supported sulfonated catechol and linear catechol amide ligands and their use in selective metal ion removal and recovery from aqueous solutions

The present invention concerns the synthesis of several biomimetically important polymer-supported, sulfonated catechol (PS-CATS), sulfonated bis-catechol linear amide (PS-2-6-LICAMS) and sulfonated 3,3-linear tris-catechol amide (PS-3,3-LICAMS) ligands, which chemically bond to modified 6% crosslinked macroporous polystyrene-divinylbenzene beads (PS-DVB). These polymers are useful for the for selective removal and recovery of environmentally and economically important metal ions from aqueous solution, as a function of pH. The Fe.sup.3+ ion selectivity shown for PS-CATS, PS-2-6-LICAMS, and PS-3,3-LICAMS polymer beads in competition with a similar concentration of Cu.sup.2+, Zn.sup.2+, Mn.sup.2+, Ni.sup.2+,Mg.sup.2+, Al.sup.3+, and Cr.sup.3+ ions at pH 1-3. Further, the metal ion selectivity is changed at higher pH values in the absence of Fe.sup.3+ (for example, Hg.sup.2+ at pH 3). The rates of selective removal and recovery of the trivalent metal ions, e.g. Fe.sup.3+ Al.sup.3+ ion etc. with the PS-CATS, PS-2-6-LICAMS, and PS-3,3-LICAMS polymer beads use determined are useful as well as equilibrium selectivity coefficient (K.sub.m) values for all metal competition studies. The chelate effect for the predisposed octahedral PS-3,3-LICAMS polymer pendant ligand is the reason that this ligand has a more pronounced selectivity for Fe.sup.3+ ion in comparison to the PS-CATS polymer beads. The predisposed square planar PS-2-6-Mn.sup.2+, Ni.sup.2+, and Mg.sup.2+, than either PS-CATSmore » or PS-3,3-LICAMS. However, Fe.sup.3+ ion still dominates in competition with other divalent and trivalent metal ions. In the absence of Fe.sup.3+, the polymer ligand is selective for Al.sup.3+, Cu.sup.2+ or Hg.sup.2+. The changing of the cavity size from two CH.sub.2 groups to six CH.sub.2 groups in the PS-2-6-LICAMS polymer pendant ligand series does not effect the order of metal ion selectivity.« less
  1. (Berkeley, CA)
Issue Date:
OSTI Identifier:
Regents of University of California (Oakland, CA) LBNL
Patent Number(s):
US 5622996
Contract Number:
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
Country of Publication:
United States
polymer-supported; sulfonated; catechol; linear; amide; ligands; selective; metal; removal; recovery; aqueous; solutions; concerns; synthesis; biomimetically; ps-cats; bis-catechol; ps-2-6-licams; 3-linear; tris-catechol; ps-3; 3-licams; chemically; bond; modified; crosslinked; macroporous; polystyrene-divinylbenzene; beads; ps-dvb; polymers; useful; environmentally; economically; solution; function; ph; selectivity; shown; polymer; competition; similar; concentration; cu; zn; mn; mg; 1-3; changed; values; absence; example; hg; rates; trivalent; etc; determined; equilibrium; coefficient; studies; chelate; effect; predisposed; octahedral; pendant; ligand; reason; pronounced; comparison; square; planar; ps-2-6-mn; dominates; divalent; changing; cavity; size; six; series; polymer beads; trivalent metal; aqueous solution; aqueous solutions; ph value; ph values; selective removal; square planar; chemically bond; selective metal; sulfonated catechol; polymer-supported sulfonated; similar concentration; catechol amide; amide ligands; linear catechol; /521/525/

Similar records in DOepatents and OSTI.GOV collections: