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Non-Competitive and Competitive Adsorption of Pb 2+ , Cd 2+ and Zn 2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration

Author

Listed:
  • Xue Li

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

  • Songbao He

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

  • Chongling Feng

    (Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004, China)

  • Yanke Zhu

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

  • Ya Pang

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

  • Juan Hou

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

  • Kun Luo

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

  • Xingsheng Liao

    (College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China)

Abstract

Competitive adsorption of Pb 2+ , Cd 2+ and Zn 2+ ions on sodium dodecyl sulfate (SDS) in binary mixtures were investigated compared with non-competitive adsorption in the unitary metal solution in micellar-enhanced ultrafiltration at a temperature of 25 °C. Mutual interference effects were investigated based on the removal rate, the Langmuir Competitive Model (LCM) and equilibrium adsorption capacity ratios, q e / q m , which indicated the presence of other metal ions. The results indicated that the removal rate and adsorption capacity of Pb 2+ were higher than that of the other metal ions in unitary and binary systems. The effects on SDS micelles for Cd-Pb and Zn-Pb combinations were found to be antagonistic. However, it was a favorable effect for the Cd-Zn combination, and the metal ions sorption followed the order: Pb 2+ > Cd 2+ > Zn 2+ . The behavior of non-competitive and competitive adsorption for Cd 2+ and Zn 2+ in a single system and in the presence of Pb 2+ were well described by LCM. Moreover, the LCM showed poor fitting to non-competitive and competitive adsorption of Pb 2+ in a single solution and in the presence of Cd 2+ or Zn 2+ . In conclusion, the removal of Pb 2+ in the presence of Zn 2+ or Cd 2+ showed greater efficacy than that of Cd 2+ or Zn 2+ in the presence of Pb 2+ .

Suggested Citation

  • Xue Li & Songbao He & Chongling Feng & Yanke Zhu & Ya Pang & Juan Hou & Kun Luo & Xingsheng Liao, 2018. "Non-Competitive and Competitive Adsorption of Pb 2+ , Cd 2+ and Zn 2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration," Sustainability, MDPI, vol. 10(1), pages 1-12, January.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:1:p:92-:d:125105
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