Batch and flow adsorption experiments of rhodamine B were carried out by using peanut shell (PS) and sodium dodecyl sulfate-modified peanut shell (SDS/PS) as adsorbents. The study was aimed to evaluate the effect of SDS modification on the physicochemical character of PS and the kinetics of adsorption and adsorption capacity of PS. Instrumental characterizations consist of scanning electron microscope (SEM), Fourier Transform-Infra Red (FTIR), Boehm titration and gas sorption analyses were performed for evaluation. The results showed that SDS modification enhances the specific surface area and pore distribution. Kinetics of adsorption, adsorption isotherm, the effect of temperature, and adsorption thermodynamics were studied. It was found that in general, SDS modification enhance the adsorption rate of RhB, as well as affecting the adsorption kinetics. RhB adsorption over PS is fit to a pseudosecond-order model, while the adsorption over SDS/PS obeys Elovich kinetics model. Thermodynamic study of the adsorption kinetics was also conducted. Equilibrium study analyzed using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherms suggest that the adsorption data tend to obey D-R isotherm. The determined adsorption capacities of PS and SDS/PS are 133.146 and 236.699 meq/g.
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