TY - JOUR
T1 - Complexation and removal of trace boron from aqueous solution by an anion exchange resin loaded with chromotropic acid (disodium 2,7-dihydroxynaphthalene-4,5-disulfonate)
AU - Suzuki, Toshishige M.
AU - Tanaka, D. A.Pacheco
AU - Yokoyama, Toshiro
AU - Miyazaki, Yoshinobu
AU - Yoshimura, Kazuhisa
PY - 1999/5/21
Y1 - 1999/5/21
N2 - An ion exchanger consisting of disodium 2,7-dihydroxynaphthalene-4,5-disulfonate (chromotropic acid) and strongly basic anion exchange resin has been prepared for the removal of trace boric acid/borate. The reaction of boric acid with chromotropic acid has been examined by 11B, 1H and 13C NMR spectroscopy, and acid-base titration analysis. The NMR study suggests that chromotropic acid preferentially forms a stable bis-chelate type complex (L:B = 2:1) in an acidic pH range. The acid-base titration data are consistent with the NMR measurements. Adsorption of boric acid/borate on the resin has been examined with respect to the equilibrium adsorption, kinetics and % extraction of boric acid/borate as a function of pH. The adsorption characteristics have been compared with those of a disodium 4,5-dihydroxybenzene-1,3-disulfonate (Tiron) loaded resin and a commercially available chelating resin containing N-methylglucamine. Boric acid/borate is strongly retained on the chromotropic acid resin in the acidic region (pH 1.8-4.5), allowing quantitative removal of boron. The removal of trace amounts of boron from aqueous solution has been examined.
AB - An ion exchanger consisting of disodium 2,7-dihydroxynaphthalene-4,5-disulfonate (chromotropic acid) and strongly basic anion exchange resin has been prepared for the removal of trace boric acid/borate. The reaction of boric acid with chromotropic acid has been examined by 11B, 1H and 13C NMR spectroscopy, and acid-base titration analysis. The NMR study suggests that chromotropic acid preferentially forms a stable bis-chelate type complex (L:B = 2:1) in an acidic pH range. The acid-base titration data are consistent with the NMR measurements. Adsorption of boric acid/borate on the resin has been examined with respect to the equilibrium adsorption, kinetics and % extraction of boric acid/borate as a function of pH. The adsorption characteristics have been compared with those of a disodium 4,5-dihydroxybenzene-1,3-disulfonate (Tiron) loaded resin and a commercially available chelating resin containing N-methylglucamine. Boric acid/borate is strongly retained on the chromotropic acid resin in the acidic region (pH 1.8-4.5), allowing quantitative removal of boron. The removal of trace amounts of boron from aqueous solution has been examined.
UR - https://www.scopus.com/pages/publications/33748648027
U2 - 10.1039/a900618d
DO - 10.1039/a900618d
M3 - Article
AN - SCOPUS:33748648027
SN - 0300-9246
SP - 1639
EP - 1644
JO - Journal of the Chemical Society. Dalton Transactions
JF - Journal of the Chemical Society. Dalton Transactions
IS - 10
ER -