BULK SYNTHESIS AND SELECTIVE EXCHANGE OF STRONTIUM IONS IN NA4MG6AL4SI4O20F4 MICA

被引:133
作者
PAULUS, WJ
KOMARNENI, S
ROY, R
机构
[1] PENN STATE UNIV,MAT RES LAB,UNIV PK,PA 16802
[2] PENN STATE UNIV,DEPT AGRON,UNIV PK,PA 16802
关键词
D O I
10.1038/357571a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
ONE of the principal long-term problems associated with nuclear fission reactions is the generation of large amounts of radioactive strontium isotopes, particularly Sr-90. An effective method for the removal and entrapment of strontium from contaminated environments is therefore desirable to prevent potential health problems associated with radionuclide ingestion 1-5. In this context, inorganic cation exchangers have been useful by virtue of their capacity for structure-specific ion exchange 6-12. We report here that 'Na-4-mica' 13-15 a highly charged sodium fluorophlogopite mica (Na4Mg6Al4Si4O20F4), can be used for the selective removal of strontium ions from solution and for strontium immobilization at room temperature. We also report a novel method for bulk synthesis of 'Na-4-mica' as a pure phase. This material is unique among highly charged or brittle micas because of its ability to undergo a hydration reaction, which allows the material to be used as a highly selective strontium-ion sieve. This or similar compounds could find potential application in the decontamination and disposal of nuclear waste.
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页码:571 / 573
页数:3
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