Abstract
In this study, activated carbon was prepared from starch which is a natural substance by chemical activation method. Carbon spheres were obtained by hydrothermal carbonization of starch. Chemical activation process was carried out with NaOH at 800 oC. The effects of chemical activation on the structure and morphology of carbon spheres were evaluated using FT-IR, SEM and BET and zeta potential techniques. As a result of the activation process, the activated carbon having microporous (0,592 cm3/g) with high specific surface area (968 m2/g) was obtained. The potential of using activated carbon as an adsorbent for removal of congo red in water was investigated under several experimental conditions. Langmuir adsorption capacity of active carbon for congo red is 117,65 mg/g. Regeneration studies have shown that the activated carbon can also be used at least six times for the removal of congo red with no change in its adsorption capacity.