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Diffusion studies in humic gels

This study investigates the diffusion of metal ions, specifically Co2+, within humic gels, highlighting the significance of chemical interactions. Humic acids (HA) easily form complexes with transition metal ions, exhibiting strong diffusion effects in heterogeneous systems. The research details the experimental setup designed to suppress convective and thermal mixing, allowing for an accurate analysis of diffusion rates. The findings reveal the interplay between diffusion and first-order chemical reactions, offering valuable insights into real-world applications and future studies on various elements in similar conditions.

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Diffusion studies in humic gels

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  1. Marek Burian Martina Klučáková Miloslav Pekař Diffusion studies in humic gels Institute of Physical and Applied Chemistry Faculty of Chemistry Brno University of Technology Purkyňova 118 612 00 Brno Czech Republic

  2. why study diffusion of metal ions in humic gels? • HA form very easily complexes with ions of transition metals • rate of interaction in sol >> rate of interaction in solid • strongly diffusion-effected interaction with solid HA • diffusion effect in heterogenous system

  3. model system for diffusion study= humic gel • experimentally more tractable • simple suppression of convective and thermal mixing • close to water environment • relation to real (natural) systems

  4. non-stationary diffusion Fick law: one-dimensional problem; D D (c1)

  5. diffusion of Co2+ ions into humic gels (experimental arrangement)

  6. diffusion from constant source

  7. diffusion from constant source (supersaturated solution)

  8. diffusion from time-variable source

  9. diffusion from time-variable source (decrease of solution concentration)

  10. diffusion from time-variable source (decrease of solution concentration)

  11. diffusion with chemical reaction first order reaction: A  products

  12. interaction Co2+ with humic gel summary reaction: Co2+ + H2R  CoR + 2H+

  13. diffusion with chemical reaction

  14. diffusion with chemical reaction

  15. conclusions • simple but effective method • effect of chemical reaction! • numerical analysis inevitable • future directions • other elements • diffusion from saturated gel

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