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

Xue Li, Songbao He, Chongling Feng, Yanke Zhu, Ya Pang, Juan Hou, Kun Luo and Xingsheng Liao
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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

Sustainability, 2018, vol. 10, issue 1, 1-12

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+ .

Keywords: competitive adsorption; micellar-enhanced ultrafiltration (MEUF); heavy metal ions; sodium dodecyl sulfate (SDS) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
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