| 溶液介质条件对重金属离子与石英表面反应的影响 |
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| 引用本文： | 吴宏海,吴大清,彭金莲.溶液介质条件对重金属离子与石英表面反应的影响[J].地球化学,2000,29(1):62-66. |
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| 作者姓名： | 吴宏海 吴大清 彭金莲 |
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| 作者单位： | 中国科学院广州地球化学研究所!广东广州510640 |
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| 基金项目： | 国家自然科学基金!49572091 |
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| 摘 要： | 实验研究表明，随着溶液ＰＨ值的升高石芟夺Ｃｕ＾２＋、Ｐｂ＾２＿、Ｃｄ＾２＋等重金属离子的吸附量和表面吸附覆盖率逐渐增大，而表面反应产物的结合开矿相应地出现由单核化合物、多核化合物〖ＳＯＣｕ４（ＯＨ）３＾４＋〗，直至表面沉淀（ＳＯＨ…Ｃｕ（ＯＨ）２（ｓ）〗。随着温度升高，石英对Ｃｕ＾２＋、Ｐｂ＾２＋、Ｃｄ＾２＋等重金属离子的吸附量逐渐减是随着溶液离子强度的增大，石英对Ｃｕ＾２＋离子的吸附量和表面离了
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| 关 键 词： | 石英 重金属离子 表面反应 介质条件 溶液 |
Influences of aqueous medium conditions on surface reactions of heavy metal ions with quartz |
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| WU Hong-hai, WU Da-qing, PENG Jin-lian.Influences of aqueous medium conditions on surface reactions of heavy metal ions with quartz[J].Geochimica,2000,29(1):62-66. |
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| Authors: | WU Hong-hai WU Da-qing PENG Jin-lian |
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| Abstract: | Sorption of divalent metal ions, including Cu2+, Pb2+ and Cd2+, onto quartz was measured at the same initial concentration of the ions and ionic strength (I= 0. 1 mol/L) under condition of pH value ranging from 2. 6 to 11. The sorption densities and surface coverage of the ions increased with increasing solution pH value. The experimental measurements can be simulated with mechanisms to form mononuclear complexes under conditions of low pH (< 6. 5 for Cu2+; < 7. 0 for Pb2+ and Cd2+), and to form multinuclear complexes versus three-dimensional precipitates under conditions of high pH (> 6. 5 for Cu2+; > 7.0 for Pb2+ and Cd2+ ). The sorption densities of the ions increased with a rise in temperature. The sorption densities of Cu2+ increased with the ionic strength that change from 0.1 to 1. 0 mol/L, while it was opposite in the case for Pb2+ and Zn2+ ions. Therefore, surface reactions of the heavy metal ions with quartz can be influenced by the factors of pH value, temperature and ionic strength. |
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| Keywords: | quartz heavy metal ions surface reactions aqueous medium conditions |
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