TY - JOUR
T1 - Development of bifunctional anion-exchange resins with improved selectivity and sorptive kinetics for pertechnetate
T2 - Batch-equilibrium experiments
AU - Bonnesen, Peter V.
AU - Brown, Gilbert M.
AU - Alexandratos, Spiro D.
AU - Bavoux, Laurie Bates
AU - Presley, Derek J.
AU - Patel, Vijay
AU - Ober, Robert
AU - Moyer, Bruce A.
PY - 2000/9/1
Y1 - 2000/9/1
N2 - A novel class of strong-base anion-exchange resins, bearing two different types of exchange sites, is described. These bifunctional resins have anion-exchange sites composed of two separate and differently sized trialkylammonium groups. In pertechnetate (TcO4-) uptake experiments from a solution matrix containing anions commonly encountered in groundwater, bifunctional resins containing exchange sites derived from tri-n-hexylamine in combination with either triethylamine, tri-n-propylamine, or tri-n-butylamine were shown to possess superior 24-h distribution ratios (K(d)) for pertechnetate over all monofunctional anion-exchange resins (derived from a single trialkylamine) examined. For example, although monofunctional resins containing a tri-n-hexylammonium exchange site possessed excellent selectivity for pertechnetate over other anions, the exchange kinetics were poor. The superior performance of these resins can be attributed to the combination of a large trialkylammonium site for enhanced selectivity for large anions and a smaller trialkylammonium site for the retention of good exchange kinetics.
AB - A novel class of strong-base anion-exchange resins, bearing two different types of exchange sites, is described. These bifunctional resins have anion-exchange sites composed of two separate and differently sized trialkylammonium groups. In pertechnetate (TcO4-) uptake experiments from a solution matrix containing anions commonly encountered in groundwater, bifunctional resins containing exchange sites derived from tri-n-hexylamine in combination with either triethylamine, tri-n-propylamine, or tri-n-butylamine were shown to possess superior 24-h distribution ratios (K(d)) for pertechnetate over all monofunctional anion-exchange resins (derived from a single trialkylamine) examined. For example, although monofunctional resins containing a tri-n-hexylammonium exchange site possessed excellent selectivity for pertechnetate over other anions, the exchange kinetics were poor. The superior performance of these resins can be attributed to the combination of a large trialkylammonium site for enhanced selectivity for large anions and a smaller trialkylammonium site for the retention of good exchange kinetics.
UR - http://www.scopus.com/inward/record.url?scp=0034284992&partnerID=8YFLogxK
U2 - 10.1021/es990858s
DO - 10.1021/es990858s
M3 - Article
AN - SCOPUS:0034284992
SN - 0013-936X
VL - 34
SP - 3761
EP - 3766
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 17
ER -