Phase Transformations and Proton Promoted Dissolution of Hydrous Manganite (γ-MnOOH)

被引：0
|
作者：
Madeleine Ramstedt
Staffan Sjöberg
机构：
[1] Umeå University,Department of Chemistry, Inorganic chemistry
[2] STI-IMX-LMCH,undefined
[3] EPFL,undefined
来源：
Aquatic Geochemistry | 2005年 / 11卷
关键词：
manganite; gamma-MnOOH; disproportionation; dissolution; pyrolusite; MnO; AFM; XRD; SEM; phase transformation;
D O I：
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中图分类号：
学科分类号：
摘要：
The objective of this study was to describe the proton promoted disproportion of synthetic manganite (γ-MnOOH) and to characterise the resulting phase transformations. The solution and remaining solid phase after disproportionation was analysed by techniques including atomic absorbance spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). In suspensions with pH between 5 and 7, −log[H+] was monitored for 17 months and equilibrium constants were determined at 9, 12 and 17 months of reaction time for the following reaction (25 °C, 0.1 M (Na)NO3):
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页码：413 / 431
页数：18
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