N-thiocarbamoyl-polyalkylenepolyamine group containing heavy metal adsorbing resins

摘要

A heavy metal adsorbing resin of which the main polymer chain consists of an aliphatic hydrocarbon skeleton and which contains at least one functional group selected from amino, polyalkylene polyamino, hydrazido, thioureido, thiosemicarbazido, isothiocyanato, thiobiuret, N-thioaminobiuret, and N-thiocarbamoyl-polyalkylene amino groups. Heavy metals can be removed from a solution containing them by contacting the solution with the above heavy metal adsorbing resin. The resin has a markedly high rate of adsorbing the heavy metals, and can be easily regenerated with a mineral acid or sodium sulfide. The suitable time of regenerating or replacing the resin can be detected by its color change upon adsorption of the heavy metals.