Abstract
In this study, samples of pristine and chemically modified coconut shells are used as adsorbents for the removal of crystal violet from an aqueous solution. The modification based on NaOH treatment of coconut shell fibers was evaluated by scanning electron microscopy and Fourier transform infrared spectroscopy. The dye uptake efficiency was evaluated by determining the variation in dye concentration, pH, adsorbent mass, and reaction time. The equilibrium condition of the overall process was analyzed by standard methods (Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherms), while kinetics were evaluated using the pseudo-first-order/pseudo-second-order, Elovich, and intra-particle diffusion models.
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