Abstract
The Cr-tanned leather shaving wastes have been used to prepare the N-doped porous carbon with high specific surface area. The Cr-containing compound was in-situ converted to Cr2O3 during the carbonization process, which further acted as the template to react with KOH activator for pore-forming. Driven by the synergetic effects of numerous micropores and electrostatic attraction of nitrogen, this porous carbon could be novelty applied for the Cr(VI) adsorption. As the results show, the adsorption experiment data fit well with Langmuir isotherm, and the adsorption kinetic behavior matches well with the pseudo-second-order kinetic equation. The maximum adsorption capacity of Cr(VI) reaches 540.54 mg/g at 50 °C. The thermodynamic data indicate that the adsorption of Cr(VI) is a spontaneous endothermic process (ΔG < 0, ΔH > 0). This research explores a new way to synergistically dispose the solid/liquid Cr-containing wastes for that “no waste, all is utilized”.
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