Özet:

In this study, the removal of Everzol Yellow 3RS dye by adsorption process was investigated by using Gyttja. The effects of pH (3–11), contact time (5–300 min), adsorbent dose (2–16 g/L), initial concentration (10–50 mg/L), and temperature (25–60°C) on the adsorption process were investigated. In the adsorption process, 10 g/L adsorbent dose, original pH value, 90 minutes contact time, 10 mg/L dye concentration, and ambient temperature were determined as the conditions where the maximum removal efficiency (90.96%) was achieved. To understand the mechanism of the adsorption process on Gyttja, kinetic and equilibrium models were applied. According to the results obtained from the kinetic and isotherm experiments, the adsorption kinetics for the adsorption of Everzol Yellow 3RS dye onto Gyttja were well described by the pseudo-second-order reaction model and the adsorption equilibrium by the Freundlich isotherm model. This means that the rate-limiting step may be chemisorption rather than diffusion, and both film diffusion and intra-particle diffusion processes are significant. It also showed that the adsorption mechanism is not uniformly distributed and is not limited to a single layer. As a result, it was observed that Gyttja can be used as a potential adsorbent in dyestuff removal.