Invesigation of the use of black cumin (Nigella sativa L.) in the removal of dye from aqueous solutions

In the world, water pollution is one of the most important problems for this purpose, it is necessary that waste water must be treatment before discharge to the aqueous environment. It is known that adsorption is the well process for treatment of pollutant in an aqueous environment. In this study, removal of methylene blue (MB) and Malachite green (MG) from aqueous solution using pulp (Nigella sativa L.) was investigated by adsorption. Effects of pH, initial dye concentration and contact time on adsorption of (Nigella sativa L.) pulp were studied in a batch system. The available data were applied to Langmuir and Freundlich isotherms. The Langmuir model is the most suitable isotherm for both MB (R2=0,999) and Malachite green (R2=0,9996). Moreover, kinetic of adsorption were also calculated. The pseudo second-order kinetic model for both dyes seems to be the best fit. Both Nigella sativa L. pulp and the dye loaded Nigella sativa L. pulp characterized by SEM. Therefore Nigella sativa pulp could be no-cost and powerful adsorbent for the adsorption of MB and MG.