Cs+ and Sr+ ion-exchange properties of microporous tungstates

被引：0

作者：

Luca, V ^{[1
]}

Griffith, CS ^{[1
]}

Chronis, H ^{[1
]}

Widjaja, J ^{[1
]}

Li, HJ ^{[1
]}

Scales, N ^{[1
]}

机构：

[1] Australian Nucl Sci & Technol Org, Mat & Engn Sci, Menai, NSW 2234, Australia

来源：

SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVII | 2004年 / 807卷

关键词：

D O I：

暂无

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The hydrothermally prepared hexagonal tungsten bronze (HTB) phase displays promising distribution coefficients (K-D) for both Cs+ (2 - 100 ppm) and Sr2+ (0.5 - 60 ppm) in acidic (1M HNO3) radioactive waste simulants. The development of an inorganic ion-exchanger that displays such selectivity has previously eluded researchers in this field. The selectivity for Cs+ and Sr2+ can be modulated by isomorphous substitution of molybdenum into the tungstate framework, and is optimum for material of nominal composition, Na(0.2)Mo(0.03)W(0.97)O(3)(.)zH(2)O (Mo-HTB). Both the parent HTB and Mo-HTB phases display fast ion-exchange kinetics for Cs+ and Sr2+ and cation exchange capacities ca. 50% that of the theoretical capacities of 0.9 and 0.45 mmol.g(-1), respectively. The Mo-HTB adsorbent has a modest tolerance to alkali metal ions such as Na+ and K+ in acidic solutions with total Cs+ and Sr2+ uptake dropping by 66% as the concentration of Na+ increases from 9 mmol.L-1 to 1200 mmol L-1.

引用

页码：309 / 314

页数：6

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