5 years ago

Spatial Separation of Copper and Cobalt Oxalate by Flow-Driven Precipitation

Spatial Separation of Copper and Cobalt Oxalate by Flow-Driven Precipitation
Eszter Tóth-Szeles, Ágota Tóth, Bíborka Bohner, Dezső Horváth
A precipitation reaction is investigated far from equilibrium by introducing a continuous flow of the homogeneous mixture of water-soluble metal salts into sodium oxalate solution. The spreading gravity current maintained by the density difference between the solutions creates a radially symmetric precipitate pattern that contains spatially separated copper oxalate monohydrate and cobalt oxalate tetrahydrate, identified by X-ray diffraction measurements. In the transition zone, a unique crystalline composite containing copper oxalate plates with cobalt oxalate coating also forms.

Publisher URL: http://dx.doi.org/10.1021/acs.cgd.7b01020

DOI: 10.1021/acs.cgd.7b01020

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