TY - JOUR
T1 - Adsorption of fluoride ion on the zirconium(IV) complexes of the chelating resins functionalized with amine-N-acetate ligands
AU - Tanaka, David A.Pacheco
AU - Kerketta, Sunamani
AU - Tanco, Margot A.Llosa
AU - Yokoyama, Toshiro
AU - Suzuki, Toshishige M.
PY - 2002
Y1 - 2002
N2 - The reaction of fluoride ion with Zr(IV)-ethylenediamine-N, N, N′, N′-tetraacetate (EDTA) complexes has been examined by 19F and 1H NMR spectroscopies and potentiometry using [Zr(H2O)2EDTA] and K2[Zr(CO3)EDTA] as the model compounds. Ternary complex formation has been suggested as the most plausible mechanism for the retention of fluoride ion on the Zr(IV) complexes. Removal of fluoride ion has been attempted by the use of polymer homologues of Zr(IV)-EDTA complexes. Adsorption characteristics of fluoride ion on Zr(IV) complexes of the chelating resins [CMA (carboxymethylamine) and IDA (iminodiacetic acid) resins] have been investigated. The adsorption capacities and the binding constants for fluoride ion on the Zr(IV) loaded resins have been analyzed using Langmuir model of adsorption. Common anions including chloride, nitrate, acetate, and sulfate ions did not interfere significantly with the adsorption of fluoride ion, whereas the presence of phosphate ion reduced the fluoride capacity markedly. The adsorption rate of fluoride ion uptake by Zr-CMA resin is much faster than that of the Zr-IDA resin. A column process including adsorption, desorption, and regeneration cycles has been demonstrated for the removal of fluoride ion to depict a practical application.
AB - The reaction of fluoride ion with Zr(IV)-ethylenediamine-N, N, N′, N′-tetraacetate (EDTA) complexes has been examined by 19F and 1H NMR spectroscopies and potentiometry using [Zr(H2O)2EDTA] and K2[Zr(CO3)EDTA] as the model compounds. Ternary complex formation has been suggested as the most plausible mechanism for the retention of fluoride ion on the Zr(IV) complexes. Removal of fluoride ion has been attempted by the use of polymer homologues of Zr(IV)-EDTA complexes. Adsorption characteristics of fluoride ion on Zr(IV) complexes of the chelating resins [CMA (carboxymethylamine) and IDA (iminodiacetic acid) resins] have been investigated. The adsorption capacities and the binding constants for fluoride ion on the Zr(IV) loaded resins have been analyzed using Langmuir model of adsorption. Common anions including chloride, nitrate, acetate, and sulfate ions did not interfere significantly with the adsorption of fluoride ion, whereas the presence of phosphate ion reduced the fluoride capacity markedly. The adsorption rate of fluoride ion uptake by Zr-CMA resin is much faster than that of the Zr-IDA resin. A column process including adsorption, desorption, and regeneration cycles has been demonstrated for the removal of fluoride ion to depict a practical application.
KW - Fluoride ion
KW - Polymer chelating resin
KW - Separation
KW - Zr(IV)-EDTA complex
UR - https://www.scopus.com/pages/publications/0036198862
U2 - 10.1081/SS-120002221
DO - 10.1081/SS-120002221
M3 - Article
AN - SCOPUS:0036198862
SN - 0149-6395
VL - 37
SP - 877
EP - 894
JO - Separation Science and Technology
JF - Separation Science and Technology
IS - 4
ER -