Abstract
The objectives of this work were to investigate the adsorption of Reactive Blue 21(RB21) onto clay(C), activated clay (AC), and modified clay (MC). The adsorbents were characterized by FTIR, XRD, TGA, and BET. Batch studies were carried out to evaluate parameters affecting adsorption such as contact time, pH, sorbent dose, and temperature. Among the kinetic models tested, the adsorption kinetics was best described by the pseudo-second-order equation. The data fitted well with Freundlich, Langmuir, Temkin, and Halsey isotherms. The reusability of the adsorbents using 1 N NaOH for over three cycles indicates the economic significance of these materials as adsorbents.
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