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The main intent of this paper is to assess the biosorption potential of Cr(VI) based on Vernonia Cinneria bark activated carbon. The adsorbent is characterized based on the energy dispersive X-ray spectrometer, X-ray diffraction spectrometer, Fourier Transform Infrared and scanning electron microscope. The variables of biosorption are pH, Initial concentration of Cr (VI), contact time and process temperature. pH level is optimized at 2. The adsorption isotherms express the models of Langmuir, Freundlich, Temkin & D-R adsorption. Effective experimental data is obtained from the Langmuir adsorption model Compared with other models. Kinetic models applied to the adsorption of Cr (VI) ions and compared with pseudo first-order, the pseudo second-order, Elovich and intraparticle diffusion kinetic models. From result it is shown that experimental data is correlated with the pseudo second-order kinetic model.
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