The adsorption behavior of heavy metals on anionic surfactant micelles
The adsorption behaviors of monovalent metal ion (Na) and divalent metal ions (Cu, Cd and Pb,) on micelles composed of the anionic surfactant, dodecylsulfate (DS{sup {minus}}) were investigated in ultrafiltration experiments in this study. The anionic surfactant molecule consists of a polar moiety with negative charge and a nonpolar moiety with neutral charge. As the surfactant concentration is greater than the critical micelle concentration (cmc), a surfactant molecule will aggregate with other surfactant molecules to form micelles which surfaces are surrounded with negative charges. Due to columbic attraction, the heavy metals will be adsorbed on the micelle surface. The experimental results indicate that the anionic micelles have a higher affinity for divalent species than for the monovalent specie. However, a high concentration of Na{sup +} competes for surface area diminishing the ability of the DS{sup {minus}} to adsorb either divalent species. At experimental conditions from 0 to 100 mM NaCl addition, the percentage of Na, Cu, Cd and Pb, adsorbed on micelle surface are 17.4{approximately}3.7%, 77.8{approximately}31.1%, 85.7{approximately}10.0% and 83.4{approximately}19.4%, respectively. The results show that the removal of heavy metals by anionic surfactant micelles is practical as fewer monovalent metals are exists.
- Research Organization:
- I-Shou Univ., Ta-Hsu Hsiang (TW)
- OSTI ID:
- 20006479
- Report Number(s):
- CONF-990608--
- Country of Publication:
- United States
- Language:
- English
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