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Abstract
The possibilities for removal of toxic ions from aqueous solutions by novel porous material obtained from Bulgarian lignite and its oxidized modifications were studied. Adsorption of Hg(II), Cd(II), Pb(II), As(III), and As(V) ions was investigated using aqueous solutions with different concentrations and acidity. Equilibrium modeling data were fitted to linear Langmuir, Freundlich, and Dubinin-Radushkevich models and maximum adsorption capacities of the investigated ions were calculated. The activated carbon treated with hydrogen peroxide proved to be the best one concerning toxic ion adsorption. Both oxidized modifications indicated a significant potential for mercury removal from aqueous solutions.
Acknowledgments
The authors thank to Dr. R. Nickolov for the creative discussion about texture parameters of activated carbons. The authors also kindly acknowledge the financial support by the National Science Fund of Bulgaria (the National Centre for New Materials UNION, Contract No DO-02-82/2008 and the Green Analytical Methods Academic Centre GAMA, Contract No DO-02-70/2008).