ION-EXCHANGE IN BERYLLOPHOSPHATE-G .1. ION-EXCHANGE EQUILIBRIA

被引:12
作者
COKER, EN [1 ]
REES, LVC [1 ]
机构
[1] IMPERIAL COLL SCI TECHNOL & MED,PHYS CHEM LABS,LONDON SW7 2AY,ENGLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1992年 / 88卷 / 02期
关键词
D O I
10.1039/ft9928800263
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ion-exchange isotherms and selectivity plots are presented for beryllophosphate-G, the synthetic beryllophosphate analogue of the zeolite gismondine. Exchange reactions involving Na+ and K+ or NH4+ were accompanied by changes in crystal symmetry and hysteresis loops were seen in the isotherms. Exchange of K+ by NH4+ was fully reversible without hysteresis and the two end members were found to have very similar symmetry. Only limited exchange of Na+ by Ca2+ or Mg2+ could be achieved under the conditions used and no symmetry change was observed. The phases present across the Na+-K+ exchange field were studied in depth using X-ray powder diffraction, solid-state NMR and scanning electron microscopy. Unit-cell parameters were calculated for fully K-exchanged beryllophosphate-G.
引用
收藏
页码:263 / 272
页数:10
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