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Abstract
Carbon waste was used as an adsorbent for the removal of Cr(VI) from aqueous solution of K2Cr2O7. The experiments were carried out at different doses of adsorbent (0.1–0.8 g), pH (1–7), and initial metal ion concentration (1–30 mg/L). Different adsorption isotherms such as Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich were tested. Langmuir adsorption isotherm was found to have highest regression value and hence the best-fit. Pseudo-second-order fitted best the kinetic data. Further, it was found that 92% chromium(VI) removal is possible at pH 2.0, adsorbent dose 0.6 g/50 ml, metal ion concentration 20 mg/L, and time 120 min. Thermodynamic parameters showed that the sorption process is endothermic and spontaneous in nature.