Adsorption of surfactant micelles and Cd2+/Zn2+ in micellar-enhanced ultrafiltration.
Micellar-enhanced ultrafiltration (MEUF) is a powerful treatment developed to remove heavy metals from wastewater. Efficient removal of Cd(2+)/Zn(2+) from wastewater was performed by MEUF using a polysulfone hollow ultrafiltration membrane, with sodium dodecyl sulfate (SDS) as the surfactant. The adsorption of surfactant micelles and Cd(2+)/Zn(2+) in MEUF was studied by changing the surfactant dosage and the Cd(2+)/Zn(2+) concentration in the feed. In addition, kinetics, adsorption isotherms, and thermodynamic rules were analyzed, and X-ray photoelectron spectroscopy (XPS) was conducted. It was found that when the Cd(2+)/Zn(2+) feed concentration was 50 mg/L, and the SDS dosage reached 2.15 g/L, the concentration of heavy metal ions in the permeate stabilized at around 1-4 mg/L, and the adsorption of Cd(2+)/Zn(2+) on SDS micelles followed second-order kinetics and the Langmuir isotherm laws. Adsorption is a spontaneous endothermic process in which the adsorption force is principally the attraction of opposite electrical charges.
Huang
Jin-Hui
JH
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China. huangjinhui_59@163.com
Zeng
Guang-Ming
GM
Zhou
Chun-Fei
CF
Li
Xue
X
Shi
Liang-Jing
LJ
He
Song-Bao
SB
D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D007700:Kinetics; D019216:Metals, Heavy / Q000302:isolation & purification; D008823:Micelles; D013501:Surface-Active Agents / Q000737:chemistry; D014462:Ultrafiltration / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D015032:Zinc / Q000302:isolation & purification*
D019216:Metals, Heavy; D008823:Micelles; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D002104:Cadmium; D015032:Zinc