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Introduction: Dyes are one of the most important existing pollutants in textile industrial wastewater. These compounds are often toxic, carcinogenic, teratogenic, and non- biodegradable. Carcinogenic and mutagenic potential of some azo dyes as a category of common dyes in different types of industries has been reported. Reactive red 198 is one of the azo dyes that are currently used in the textile industry. This study was performed to investigation of reactive red 198 dye removal by multi-wall carbon nano tubes (MWCNTs) from synthetic textile wastewater and also determination of adsorption isotherms. Methods: This study was performed experimentally in laboratory scale and in a batch system. In this research the effect of initial dye concentration (10, 50, 100, 200 mg/L), absorbent dosage (0.01-0.05 g/100ml) reaction time (30, 60, 90, 120, 150, 180, 210, 240, 270 min) and pH (2,3,4,5,7,9,11) were investigated. The dye concentrations were measured via spectrophotometer (518 nm wavelengths). Adsorption isotherms were determined and correlated with Longmuir, Freundlich and Bet models. Results: The maximum adsorption capacity of reactive red 198 onto MWCNTs was 1000 mg/g. According the results of this study, the most removal efficiency of dye equal 74.4% (372.02 mg/g) was obtained at initial dye concentration 50 mg/l at pH=4 , also, the best time for equilibrium was 3 hr. Also, the findings of this study well fitted with Longmuir isotherm (R2=0.9996), towards Freundlich and Bet models. Conclusion: According to results of this study, it was concluded that the MWCNTs has high ability to remove Reactive Red 198 dye from aqueous solutions and textile industry wastewaters

Keywords: Reactive Red, Carbon nano tubes, Textile effluents

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