Effects of pH on the Todorokite Formation from Cu-Buserite at Atmospheric Pressure

• 责任者：Cui Haojie （Key Laboratory of Subtropical Agricultural Resources and Environment ; Ministry of Agriculture ; Huazhong Agricultural University ; Wuhan 430070 ; China） ; Feng Xionghan
• 刊名：Acta Mineralogica Sinica
• 出版年：2009
• 卷期：29(2)
• 关键词：钙锰矿 ; todorokite
• 页码：p.207-214
• 图表：5 illus., 7 tables, 21 refs.
• 分类号：0700
• issnNo：ISSN1000-4734
• isbnNo：CN52-1045/P

Todorokite is a common manganese oxide with tunnel structure on the Earth surface and was mainly synthesized through Na-buserite (Na-buserite exchanged with different metal ions as an interlayer ion) as the precursor. The effects of pH on the formation of Cu-buserite and transformation to todorokite during refluxing process at atmospheric pressure were studied in this paper. However, todorokite formation rate was proportional to the amount of Cu²⁺ in the solution, and Na-buserite converted completely to todorokite over 4 mmol of Cu²⁺ when the pH of the solution was adjusted to 4. 5. The difference between the above two transformations of Na-buserite to todorokite was correlative to the change of sub-structure of Na-buserite at different pH and the form of Cu²⁺ in the interlayer of Cu-buserite.