Effect of oxidation on the removal Cu(2+), Cd(2+) and Mn (VII) from dilute aqueous solutions by Upper Freeport bituminous coal. Quarterly report, June--August 1995

摘要

Upper Freeport bituminous coal was able to remove Mn (VII) from dilute aqueous solution by concurrent adsorption and reduction of the manganese to lower valence, less toxic states. On analysis of the kinetics of copper and cadmium uptake from dilute aqueous solution, adsorption equilibria, and functional groups analyses, it was apparent that the different oxidative pre-treatments affected both the surfaces and pore structure of Upper Freeport coal. The large amount of carboxyl and phenolic functional groups remaining after contact with copper and cadmium solutions, as determined by functional groups analyses, indicated the low affinity of the surface acid groups for these cations. Furthermore, there was almost no metal ion removal at low solution pH's, which precludes the use of Upper Freeport for treating acidic wastes and effluents such as acid mine drainage.