Inorganic Clay/Sodium Lignosulfonate Graft Acrylamide and Maleic Anhydride Adsorbent Composites
Adsorbent composites comprising of inorganic clay/sodium lignosulfonate graft-polymerized with acrylamide and maleic anhydride were synthesized by free radical solution copolymerization. The synthesized copolymers presented high adsorption capacity when the monomer ratio of acrylamide to maleic anhydride was 3:2 and montmrillonite was introduced as inorganic clay. The equilibrium adsorption of Pb2+ on these copolymers was well represented by Langmuir model which indicated that the Pb2+ adsorption was a monolayer chemical adsorption. The calculated adsorption capacity of the copolymers could reach a maximum of 176.70 mg/g for Pb2+ and 24.95 mg/g for Cu2+. In addition, these copolymers could selectively remove Pb2+ from Pb2+/Cu2+ binary solution and the maximum selective coefficient of Pb2+ to Cu2+ was 11.939.
Q. X. Yao et al., "Inorganic Clay/Sodium Lignosulfonate Graft Acrylamide and Maleic Anhydride Adsorbent Composites", Applied Mechanics and Materials, Vol. 628, pp. 3-6, 2014