Abstract
This paper deals with the adsorption of heavy metal ions (Cu2+ and Zn2+) on the carbonaceous materials obtained by chemical activation and ammoxidation of Polish brown coal. The effects of phase contact time, initial metal ion concentration, solution pH, and temperature, as well as the presence of competitive ions in solution, on the adsorption capacity of activated carbons were examined. It has been shown that the sample modified by introduction of nitrogen functional groups into carbon structure exhibits a greater ability to uptake heavy metals than unmodified activated carbon. It has also been found that the adsorption capacity increases with the increasing initial concentration of the solution and the phase contact time. The maximum adsorption was found at pH = 8.0 for Cu(II) and pH = 6.0 for Zn(II). For all samples, better fit to the experimental data was obtained with a Langmuir isotherm than a Freundlich one. A better fit of the kinetic data was achieved using the pseudo-second order model.
Highlights
Introduction and Elza BontempiIt is known that human activity generates large amounts of pollutants, contributing to degradation of the natural environment
Sorption studies were carried out using the carbonaceous sorbents prepared by chemical activation with KOH (A) or activation with KOH followed by ammoxidation process (AN)
The first stage of the copper and zinc adsorption study was to check the effect of the time of the process on the amount of metal ions adsorbed from water solutions
Summary
Introduction and Elza BontempiIt is known that human activity generates large amounts of pollutants, contributing to degradation of the natural environment. Min, a rapid sorption oftwo metals wasofobserved, interpreted asstage, related to the20presence of acidic functional g of metals was on observed, interpreted related to the presence ofions acidic functional groups the carbon surfaces,aswhich attracted the metal endowed with positive chan on the carbon at surfaces, which attractedchemical the metaladsorption ions endowed positive change,ofsothe time this stage, irreversible tookwith place. An extension at this stage, irreversible chemical took increase place. Adsorption was fast, large amount of ions were removed from the solution
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