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Sustainability 2018, 10(1), 92; https://doi.org/10.3390/su10010092

Non-Competitive and Competitive Adsorption of Pb2+, Cd2+ and Zn2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration

1
College of Biological and Environmental Engineering, Changsha University, Changsha 410003, China
2
Institute of Environmental Science and Engineering Research, Central South University of Forestry & Technology, Changsha 410004, China
*
Author to whom correspondence should be addressed.
Received: 24 October 2017 / Revised: 15 December 2017 / Accepted: 27 December 2017 / Published: 2 January 2018
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Abstract

Competitive adsorption of Pb2+, Cd2+ and Zn2+ 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, qe/qm, which indicated the presence of other metal ions. The results indicated that the removal rate and adsorption capacity of Pb2+ 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: Pb2+ > Cd2+ > Zn2+. The behavior of non-competitive and competitive adsorption for Cd2+ and Zn2+ in a single system and in the presence of Pb2+ were well described by LCM. Moreover, the LCM showed poor fitting to non-competitive and competitive adsorption of Pb2+ in a single solution and in the presence of Cd2+ or Zn2+. In conclusion, the removal of Pb2+ in the presence of Zn2+ or Cd2+ showed greater efficacy than that of Cd2+ or Zn2+ in the presence of Pb2+. View Full-Text
Keywords: competitive adsorption; micellar-enhanced ultrafiltration (MEUF); heavy metal ions; sodium dodecyl sulfate (SDS) competitive adsorption; micellar-enhanced ultrafiltration (MEUF); heavy metal ions; sodium dodecyl sulfate (SDS)
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Li, X.; He, S.; Feng, C.; Zhu, Y.; Pang, Y.; Hou, J.; Luo, K.; Liao, X. Non-Competitive and Competitive Adsorption of Pb2+, Cd2+ and Zn2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration. Sustainability 2018, 10, 92.

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