Accumulation of uranium at low concentration by the green alga Scenedesmus obliquus 34 |
| |
Authors: | Xiaozhi Zhang Shanggeng Luo Qun Yang Huaili Zhang Jinying Li |
| |
Institution: | (1) China Institute of Atomic Energy, P.O. Box 275(88), Beijing, 102413, China |
| |
Abstract: | Accumulation of UO
2
2
+ by Scenedesmus obliquus 34 was rapid and energy-independent and the biosorption of UO
2
2
+ could be described by the Freundlich adsorption isotherm below the maximum adsorption capacity (75 mg g-1 dry wt). The optimum pH for uranium uptake was between 5.0_8.5.0.1_2.0 M NaCl enhanced uranyl, while Cu2+, Ni2+, Zn2+, Cd2+ and Mn2+ competed slightly with uranyl. Pretreatment had an unexpected effect on biosorption. After being killed by 0.1 M HCl, S.
Obliquus 34 showed 45% of the uptake capacity of the control in which fresh cells were suspended directly in uranyl solution,
while the pretreatment of cells by 0.1 M NaOH, 2.0 M NaCl, ethanol or heating decreased uptake slightly. Fresh S. obliquus
34 at 1.2_2.4 mg dry wt mL-1 was able to decrease U from 5.0 to 0.05 mg L-1 after 4_6 equilibrium stages with batch adsorption.
Deposited U could be desorbed by pH 4.0 buffer. It is suggested that U was captured by effective groups or by capillary action
in the cell wall in the form of UO2OH]+.
This revised version was published online in August 2006 with corrections to the Cover Date. |
| |
Keywords: | Scenedesmus obliquus 34 uranyl biosorption cell pretreatment simulated wastewater batch experiment |
本文献已被 SpringerLink 等数据库收录! |
|