Oxidized activated carbon (OAC) was prepared from a waste mixture containing palm stem, paper, and plastic and used for the removal of Co(II) from aqueous medium. Adsorption was studied as a function of OAC dose (0.03–0.1 g), time (10–180 min), pH (2–6) and initial Co(II) concentration (50 mg L –1 ). The maximum adsorption capacity was found 83.6 mg g –1 at pH 4. The adsorption process followed the Freundlich isotherm model and pseudo-second-order kinetics. The OAC showed better efficiency comparable with other reported adsorbents. The results suggested that the prepared OAC could be used as a cost-effective adsorbent for the Co(II) removal from aqueous solutions.
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Kenawy et al. (2017) studied this question.
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