Adsorbent composites comprising of bentonite/sodium lignosulfonate graft-polymerized with acrylamide and maleic anhydride (BLPAMA) were synthesized, characterized, and used to remove Pb2+ from aqueous solution with a large adsorption capacity. The fundamental adsorption behavior of the as-prepared BLPAMA was studied as a function of adsorbent dosage, initial pH, contact time, temperature, concentration of Pb2+, and additive electrolyte. Results showed that the adsorption of Pb2+ on BLPAMA was temperature-independent but strongly pH dependent. T...