Abstract
Poly [ N-(dithiocarboxylate)-iminioethene] dispersed on kieselguhr provides a highly effective column packing for the removal of toxic heavy metals from aqueous solution. Metal ions removed include iron(II), cobalt(II), rhodium(III), nickel(II), palladium(II), platinum(II), copper(II), silver(I), zinc(II), cadmium(II) and mercury(II). The high metal ion uptakes previously observed in batch operation are maintained in column operation. Feed solutions with temperatures between ambient and 45°C are tolerated. pH values as low as 0.5 are not harmful to the column so long as the acid is hydrochloric acid. Nitric and sulphuric acids can be used down to pH 3.5 without harming the polymer. The column can be regenerated using cyanide solution for all metal ions except iron(II), cobalt(II) and zinc(II); disodium ethylenediaminetetraacetate can be used for these three metal ions.
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