sw16 - Reactions of Aluminosilcates Building Blocks for...

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Reactions of Aluminosilcates
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oxygen silicon(Si 4+ ) hydroxide (OH - ) Aluminum (Al 3+ ) Silicon Tetrahedron Aluminum octahedron Building Blocks for Silicate Clays
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Tetrahedra and Octahedra Sharing the Oxygens Linkage of thousands of silica tetrahedra and aluminum octahedra O Si O, OH Al OH Tetrahedra octahedra { { 1:1 Mineral
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Tetrahedra octahedra { { Tetrahedra { 2:1 mineral
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Interlayer Space
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Electrical Charge
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Positive charge Al 3+ Si 4+ Negative charge OH - O 2- Charge Balance Al 3+ Si 4+ OH - O 2- =
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Isomorphous Substitution Substitution of lower-charge cations for higher charge cations during mineral formation. Al 3+ for Si 4+ in tetrahedra Mg 2+ for Al 3+ in octahedra The result is a deficit of positive charge or a surplus of negative charge in the mineral structure.
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Tetrahedral Substitution Al 3+ for Si 4+
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Octahedral Substitution Mg 2+ for Al 3+
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Tetrahedral Substitution Octahedral Substitution Al 3+ for Si 4+ Mg 2+ for Al 3+
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Na + Na + Na + Na + Na + Na + Na + Charge
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- - - - - - - - - - - - - - - Charged Surface Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + High cation concentration Ambient solution concentration Decreasing concentration Na + Na +
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- - - - - - - - - - - - - - - High cation concentration Ambient solution concentration Charged Surface Dense swarm of cations
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Na + K + K + Na + K + K + K + Cation Exchange Na + Na + Na + Na + Na + Which Cations are preferred?
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Factors Determining Cation Preference 1. Concentration 2. Charge (+1, +2,+3) 3. Size
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This note was uploaded on 02/04/2011 for the course SWS 3022 taught by Professor Bonczek during the Spring '11 term at University of Florida.

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sw16 - Reactions of Aluminosilcates Building Blocks for...

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