X-ray absorption and electron paramagnetic resonance studies of Cu(II) sorbed to silica: Surface-induced precipitation at low surface coverages

被引:61
作者
Xia, K [1 ]
Mehadi, A [1 ]
Taylor, RW [1 ]
Bleam, WF [1 ]
机构
[1] ALABAMA A&M UNIV, DEPT PLANT & SOIL SCI, NORMAL, AL 35762 USA
关键词
Cu(II); silica; XAFS; EPR; adsorption; surface precipitation;
D O I
10.1006/jcis.1996.4590
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
Both EPR and XAFS spectroscopy were used to characterize the sorption of Cu(II) on silica surfaces at extremely low surface coverage (0.8 and 9.9% monolayer). The binding structure of Cu(II) on silica surfaces revealed by XAFS experiment was compared to that predicted by EPR spectra. Our XAFS results show that Cu(II) hydroxide clusters form on silica surfaces even at surface coverage as low as 0.8% of a monolayer. However, we observed low EPR intensity and line-broadening which has been assigned to dipole-dipole interactions between isolated Cu(II) ions. The results of our XAFS studies indicate that the loss of EPR intensity and line-broadening can be traced to Cu(OH)(2) clusters on silica surfaces. (C) 1997 Academic Press
引用
收藏
页码:252 / 257
页数:6
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