Adsorption of Hexavalent Chromium and Divalent Lead Ions on the Nitrogen-Enriched Chitosan-Based Activated Carbon.

Optimizing the physicochemical properties of the chitosan-based activated carbon (Ch-ACs) can greatly enhance its performance toward heavy metal removal from contaminated water. Herein, Ch was converted into a high surface area (1556 m/g) and porous (0.69 cm/g) ACs with large content of nitrogen (~16 wt%) using KCO activator and urea as nitrogen-enrichment agents.