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AbstractMulti walled carbon nanotubes (MWCNTs) have been perceived to have a potential to be a superior adsorbent in the adsorption of dye from wastewater because of the unique chemical and physical properties. The research work deals with application of MWCNTs for the adsorptive removal of carcinogenic cationic dye malachite green (MG) and anionic Congo red (CR) in water by individual as well as for binary mixtures. The batch experimental studies showed the 95% removal of MG as compared to CR which was 80% removed using an optimum dosage.  The results of isothermal adsorption of single dye from a solution were fitted to Langmuir, Freundlich, Redlich–Peterson and Sips equilibrium isotherm models. Various predictive and correlative isotherm models were tested to analyze the behavior of competitive adsorption of dyes from a binary solution.