TY - JOUR
T1 - Ion-exchange selectivity for alkali metal ions on a cryptomelane-type hydrous manganese dioxide
AU - Tsuji, Masamichi
AU - Abe, Mitsuo
AU - Komarneni, Sridhar
PY - 1993/1/1
Y1 - 1993/1/1
N2 - A cryptomelane-type hydrous manganese dioxide in the H+ form has been studied for its ion-exchange selectivity for Li+, Na+, K+, Rb+ and Cs+/H+exchange at 30.CThe distribution coefficients for each alkali cation were calculated as a function of the initial concentration of exchanging cations in the presence of a constant total normality of 0.1 N. The separation factor for the Na+ - K+ pair attained 1.3 x 1013at xm—0. This extremely high selectivity can be attributed to the rigid tunnel structure with an opening which is only accessible to less hydrated cations, those that shed their hydration shell easily and those with crystal ionic radius of approximately 1.4Á.
AB - A cryptomelane-type hydrous manganese dioxide in the H+ form has been studied for its ion-exchange selectivity for Li+, Na+, K+, Rb+ and Cs+/H+exchange at 30.CThe distribution coefficients for each alkali cation were calculated as a function of the initial concentration of exchanging cations in the presence of a constant total normality of 0.1 N. The separation factor for the Na+ - K+ pair attained 1.3 x 1013at xm—0. This extremely high selectivity can be attributed to the rigid tunnel structure with an opening which is only accessible to less hydrated cations, those that shed their hydration shell easily and those with crystal ionic radius of approximately 1.4Á.
UR - http://www.scopus.com/inward/record.url?scp=0027286997&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027286997&partnerID=8YFLogxK
U2 - 10.1080/07366299308918149
DO - 10.1080/07366299308918149
M3 - Article
AN - SCOPUS:0027286997
SN - 0736-6299
VL - 11
SP - 143
EP - 158
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 1
ER -