Abstract
Materials and Methods: In this laboratory study, all experiments were performed in batch systems. This study investigated the effect of various factors, such as initial dye concentration, contact time, iron powder dose, and pH, on dye removal. The adsorption adsorption parameters were determined based on Langmuir, Freundlich and Temkin isotherms, while the kinetic models were used to establish the adsorption mechanism. Results: The results of this research showed pH = 3 and contact time = 120 minutes, increasing the ZVI dose from 200 to 5000 mg/L in 100 mg/L dye concentration, increased the adsorption efficiency from 36.78% to 97.57%. RR-198 removal followed the Freundlich isotherm (R 2 = 0.996 at 25°C) and the pseudo-second-order kinetic model. Conclusions: Considering the simplicity and efficiency of zero valent iron powder, this method is recommended for removing azo dyes from aqueous environments.
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