Micellar-enhanced ultrafiltration of cadmium and methylene blue in synthetic wastewater using SDS.
Single and simultaneous removal of Cd(2+) and methylene blue (MB) with sodium dodecyl sulfate (SDS) by micellar-enhanced ultrafiltration under different experimental conditions was investigated. In single removal process, with initial SDS concentration increasing, the removal efficiency of Cd(2+) and MB kept increasing and then decreased. When the initial concentrations of SDS and Cd(2+) were 1.0 cmc and 50 mg L(-1), respectively, the maximum removal efficiency of Cd(2+) was obtained as 99.2%. Removal efficiency of MB could achieve more than 99.9% with initial SDS concentration below 2.0 cmc. As compared with single Cd(2+) removal, the removal efficiency of Cd(2+) in the presence of MB was slightly higher with initial SDS concentration below 1.0 cmc, while decreased with the SDS concentration above 1.0 cmc. The maximum removal efficiency of Cd(2+) was 98.8% when initial concentrations of SDS and MB were 1.0 cmc and 4 mg L(-1), respectively. The removal efficiency of MB in the presence of Cd(2+) could achieve higher than 96.5%, which was only 3.4% less than the optimum result of the single removal. Meanwhile, effect of pH on removal efficiency of Cd(2+) was more significant than that of MB.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. zgming@hnu.cn
Guang-Ming
GM
Zeng
Xue
X
Li
Jin-Hui
JH
Huang
Chang
C
Zhang
Chun-Fei
CF
Zhou
Jing
J
Niu
Liang-Jing
LJ
Shi
Song-Bao
SB
He
Fei
F
Li
D002104:Cadmium / Q000302:isolation & purification*; D008567:Membranes, Artificial; D008751:Methylene Blue / Q000302:isolation & purification*; D008823:Micelles; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013501:Surface-Active Agents / Q000737:chemistry*; D014462:Ultrafiltration / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D008567:Membranes, Artificial; D008823:Micelles; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D002104:Cadmium; D012967:Sodium Dodecyl Sulfate; D008751:Methylene Blue