Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (8): 940-947.DOI: 10.11944/j.issn.1000-0518.2015.08.140436

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Effect of Ionic Strength on the Adsorption of Pb2+ and Cu2+ onto Bentonite/Sodium Lignosulfonate Graft-Polymerized with Acrylamide and Maleic Anhydride

YAO Qingxin,XIE Jianjun(),LIU Junxia,TANG Liping,LIU Yuan   

  1. School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
  • Received:2014-12-22 Accepted:2015-05-07 Online:2015-08-08 Published:2015-08-08
  • Contact: XIE Jianjun
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.31270603)

Abstract:

Adsorbent composites comprising of bentonite/sodium lignosulfonate graft-polymerized with acrylamide and maleic anhydride(BLPAMA) were prepared and used to investigate the effect of ionic strength on the adsorption of Pb2+ or Cu2+ onto BLPAMA in single or binary metal ion solutions, the adsorption isotherms, kinetics and thermodynamics of Pb2+ and Cu2+ onto BLPAMA with or without addition of 0.2 mol/L NaNO3 in the binary metal ion solutions. The results show that the increase of ionic strength leads the adsorption capacity of Pb2+ or Cu2+ to decrease in the single metal ion solution, the adsorption capacity of Pb2+ to decrease while the adsorption capacity of Cu2+ to increase in the binary metal ion solution.

 

Key words: lignin, adsorption, ionic strength, additive electrolyte, heavy metal ions

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