ISSN:
1573-5176
Keywords:
Scenedesmus obliquus 34
;
uranyl
;
biosorption
;
cell pretreatment
;
simulated wastewater
;
batch experiment
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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]+.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007911119029
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