Polymer-supported sulfonated catechol and linear catechol amide ligands and their use in selective metal ion removal and recovery from aqueous solutions
- Berkeley, CA
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-CATS 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- Assignee:
- Regents of University of California (Oakland, CA)
- Patent Number(s):
- US 5622996
- OSTI ID:
- 870910
- Country of Publication:
- United States
- Language:
- English
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Polymer-supported sulfonated catechol and linear catechol amide ligands and their use in selective metal ion removal recovery from aqueous solutions
Polymer-supported sulfonated catechol and linear catechol amide ligands and their use in selective metal ion removal and recovery from aqueous solutions
Related Subjects
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
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