Characterization of hydrous manganite (γ-MnOOH) surfaces -: an XPS study

被引：50
|
作者：
Ramstedt, M [1 ]
Shchukarev, AV [1 ]
Sjöberg, S [1 ]
机构：
[1] Umea Univ, Dept Chem, SE-90187 Umea, Sweden
来源：
SURFACE AND INTERFACE ANALYSIS | 2002年 / 34卷 / 01期
关键词：
XPS; manganite/water interface; pH dependence; dissolution; sample preparation;
D O I：
10.1002/sia.1376
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：
Crystalline manganite (gamma-MnOOH) has been synthesized and characterized using x-ray diffraction and high-resolution transmission electron microscopy techniques. The surface composition was studied with XPS between pH 0.4 and 11. Special pre-cooling procedures were developed to keep the manganite/water interface intact before and during XPS measurements. The O/OH group ratio differs between pH 6 and 11, in agreement with the acid/base characteristics of the surface. Below pH 6, on the other hand, drastic changes can be seen in the 0 1s spectra due to dissolution of manganite. Possibly the interaction of OH groups with HI in acidic suspensions is a first step leading to dissolution. The surface charge arising at high and low pH is compensated by the counter-ions Na+ and Cl-, respectively. The XPS spectra are presented and discussed in terms of the mechanisms for surface complexation and dissolution processes. Copyright (C) 2002 John Wiley Sons, Ltd.
引用
收藏
页码：632 / 636
页数：5
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