Surface Behavior of Calcite upon Uptake of Cd^2＋ and Pb^2＋

详细信息   

• 责任者：Teng H. Henry (Department of Chemistry ; University of Washington ; DC20052 ; U.S.A) ; Zhao Liang
• 刊名：Geological Journal of China Universities
• 出版年：2012
• 卷期：18(2)
• 页码：p.193-202
• issnNo：ISSN1006-7493
• isbnNo：CN32-1440/P

摘要

///The behavior of calcite surfaces in the presence of Cd^2＋ and Pb^2＋ is investigated by in situ fluid cell Atomic Force Microscopy （AFM） to determine the differences between Cd/calcite and Pb/calcite interactions. Experiments are conducted on { 1054} cleavage faces exposed to Cd- and Pb-bearing solutions that are undersaturated with respect to calcite, otavite, and cerussite. In contrast, the much larger Pb^2＋ ions are believed to form distorted octahedral surface complexes to adsorb predominantly at the more open 〈441〉＋ steps. The structural incompatibility between cerussite and calcite is speculated to account for the lack of step directions for the layer growth on calcite surfaces in the presence of Pb^2＋.