Ion-exchange properties of ion-sieve-type manganese oxides prepared by using different kinds of introducing ions
Journal Article
·
· Sep. Sci. Technol.; (United States)
Three ion-sieve-type manganese oxides, HMnO(Li), HMnO(Na), and HMnO(K), were prepared by acid treatment of Li/sup +/-, Na/sup +/-, and K/sup +/-introduced manganese oxides, respectively. Three oxides were obtained from ..gamma..-MnO/sub 2/ and the corresponding alkali metal hydroxides by heating at 600/sup 0/C. The ion-exchange properties of the adsorbents were investigated by pH titration, K/sub d/ measurements, and the adsorption of metal ions from seawater. The selectivity sequences of alkali metal ions were Na/sup +/ < Cs/sup +/ < Rb/sup +/ < K/sup +/ < Li/sup +/ for HMnO(Li) and Li/sup +/ approx. = Na/sup +/ < Cs/sup +/ < K/sup +/ < Rb/sup +/ for HMnO(Na) and HMnO(K). The high selectivity of Li/sup +/ on HMnO(Li) can be ascribed to an ion-sieve effect of spinel-type manganese oxide which was produced from LiMn/sub 2/O/sub 4/. Since HMnO(Na) and HMnO(K) had (2 x 2) tunnels of edge-shared (MnO/sub 6/) octahedra, the high selectivities of K/sup +/ and Rb/sup +/ on these samples were used to explain that the sizes of the (2 x 2) tunnels were suitable for filling ions of about 1.4 A in radius in a stable configuration. The order of metal-ion uptake from seawater was Sr/sup 2 +/ < K/sup +/ < Mg/sup 2 +/ < Ca/sup 2 +/ < Na/sup +/ < Li/sup +/ for HMnO(Li), Li/sup +/ < Sr/sup 2 +/ < Mg/sup 2 +/ < Ca/sup 2 +/
- Research Organization:
- Government Industrial Research Institute, Kagawa (Japan)
- OSTI ID:
- 5183191
- Journal Information:
- Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 22:7; ISSN SSTED
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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· Sep. Sci. Technol.; (United States)
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OSTI ID:5384337
Li[sup +] and Mg[sup 2+] extraction of Li[sup +] insertion reactions with LiMg[sub 0. 5]Mn[sub 1. 5]O[sub 4] spinel in the aqueous phase
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Sun Feb 28 23:00:00 EST 1993
· Chemistry of Materials; (United States)
·
OSTI ID:6668031
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
DATA
EXPERIMENTAL DATA
INFORMATION
ION EXCHANGE
LITHIUM COMPOUNDS
MANGANESE COMPOUNDS
MANGANESE OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS
THERMODYNAMIC ACTIVITY
TITRATION
TRANSITION ELEMENT COMPOUNDS
400105* -- Separation Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
DATA
EXPERIMENTAL DATA
INFORMATION
ION EXCHANGE
LITHIUM COMPOUNDS
MANGANESE COMPOUNDS
MANGANESE OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS
THERMODYNAMIC ACTIVITY
TITRATION
TRANSITION ELEMENT COMPOUNDS