Vanadyl ion stability in silica gels

被引:13
作者
Devi, PS [1 ]
Ganguli, D [1 ]
机构
[1] Cent Glass & Ceram Res Inst, Sol Gel Div, Calcutta 700032, W Bengal, India
关键词
D O I
10.1016/S0022-3093(98)00709-1
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
Silica gels doped with vanadium were prepared from tetra ethyl orthosilicate and an aqueous solution of NH4VO3, at a final sol pH of 1.5-2.5. Absorption and electron paramagnetic resonance (EPR) spectral studies establish that under ambient conditions the incorporated pentavalent vanadium is stabilized as tetravalent vanadyl ion in the gel monoliths. Dried gels were very stable under ambient conditions, however, transformation of V4+ to V5+ was noted during gel densification. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:50 / 54
页数:5
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