Abstract
As a consequence of mining, heavy metal ions can be exposed to the environment hence contaminate ground water and surface water amongst others. The natural polymer chitosan was proved to be an excellent adsorber material for the effective removal of iron and sulfate ions in batch as well as in column experiments. The adsorption behavior of iron ions, as well as sulfate ions was investigated by utilizing chitosan flakes as a natural adsorbent. The removal was studied using adsorbance measurements, SEM and SEM-EDX. The adsorption capacity of chitosan was determined at different times. The received adsorption capacities for iron ions were very promising with a maximum adsorption capacity of 85 mg/g and a rate of separation of 100%. The maximum adsorption capacity obtained for sulfate ions was 188.8 mg/g and a rate of 80%.
Highlights
Since approximately 100 years, brown coal is demounted in different region of Germany
The adsorption properties of chitosan as adsorber material were investigated in batch and column experiments with respect to the binding mechanism of the heavy metal ions
Chitosan has been investigated as a solid adsorber material in form of powder and flakes for the removal of iron and sulphate ions
Summary
Since approximately 100 years, brown coal is demounted in different region of Germany. The remaining anions (e.g. chloride, or sulfate) lead to further problems in the water system due to the increasing acidity Adsorbents such as activated carbon or ion exchange resins are used for the treatment of waters and waste water. Synthetic adsorbents exhibit high adsorption capacities having the disadvantage of high production costs [14] For this reason, the quest for effective and cost-efficient adsorbents for heavy metal ions has become a major topic in research during the last years. The adsorption properties of chitosan as adsorber material were investigated in batch and column experiments with respect to the binding mechanism of the heavy metal ions. SEM-EDX measurements shall contribute the understanding of the adsorption mechanism of both contrary charged ions on the surface
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