Introduction: The dye wastewaters of textile industries are often toxic and persistent in the environment. In previous years, various methods are considerate in the removal of reactive dyes. Reactive red 198 dye is one of the mono azo dyes that is now used in textile industries. The aim of this study was to investigate the efficiency of Russian Knapweed Flower powder in the removal of reactive red 198 dye from aqueous solutions. Methods: This experimental study was performed in laboratory scale and solution pH, initial dye concentration, adsorbent dose and contact time in this study have investigated. In this study, concentration of the unknown dye was determined by spectrophotometery method at wavelength 518 nm. The data accordance rate was investigated with Langmuir, Freundlich and Temkin isotherm models. Results: The results showed that the dye removal efficiency increased with decreasing pH, increasing the adsorbent dose and time. Increasing the initial dye concentration from 10 to 50 mg/L in the presence of 0.8 g/100cc adsorbent, pH 4 and contact time 120 min, caused to reducing of removal efficiency from 67.86% to 47.16%. In addition, Freundlich isotherm has best accordance with adsorption data. Conclusion: The results showed that Russian Knapweed Flower powder is able to high removal efficiency in the Reactive Red 198 dye removal. The preparation of this adsorbent is very simple and its cost is cheap. Because of the ability to good adsorption, it can also be used to remove other environmental contaminants.

Keywords: Reactive Red 198 dye, Russian Knapweed Flower powder, surface adsorption, natural adsorbents

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