Abstract
Adsorption of Congo red (CR) from aqueous solution using tunics of the corm of the saffron was studied. Experimental results obtained showed that adsorption process was highly dependent on mass of adsorbent, contact time, initial dye concentration and temperature. The sorption equilibrium for Congo red dye by tunics of the corm of the saffron was reached within 60 min and adsorption efficiency of up to 68% achieved. The sorption kinetics followed a pseudo-second-order kinetic model while Langmuir isotherm model was best applicable for obtaining the equilibrium parameters. These results demonstrate that tunics of the corm of the saffron are effective, environmentally friendly and low cost biomaterial for dye removal from aqueous dye solutions.
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