Adsorption capacity and removal efficiency of heavy metal ions by Moso and Ma bamboo activated carbons

► The adsorption capacity of heavy metal ions by bamboo activated carbons was investigated in this study. ► The optimum pH values for adsorption capacity of heavy metal ions were 5.81-9.82 by bamboo activated carbons. ► The optimum soaking time was 2-4 h for Pb2+, 4-8 h for Cu2+ and Cd2+, and 4 h for Cr3+ by Moso bamboo activated carbons, and 1 h for the tested heavy metal ions by Ma bamboo activated carbons. ► The removal efficiency of heavy metal ions by the various bamboo activated carbons decreased in the order: Pb2+ > Cu2+ > Cr3+ > Cd2+.