Porous-doped carbon prepared from Friedel–Crafts alkylated crosslinked lignosulfonates for lead removal

The nitrogen-doped porous carbon was prepared by direct carbonization of pyrrole functional crosslinked lignosulfonates precursors via Friedel-Crafts alkylation reaction, and studied for the removal of Pb(II) from water. The absorbent showed higher adsorption capacity which reached 102.77 mg/g when the initial Pb(II) concentration was 200 mg/L and the dosage was 1 mg/mL. Chemical interactions drive the adsorption and the calculated Qmax was 157.9 mg/g according to the Langmuir isotherm model. Such easily separated porous carbon with higher uptake capacity and excellent reusability could be a promising material for mitigation Pb(II) ions pollution just prepared from by-production from the paper industry.