Abstract：
:Biosorption of heavy metal elements including radionuclides by microorganisms is a promising and effective method for the remediation of the contaminated places. The responses of live Saccharomyces cerevisiae in the toxic uranium solutions during the biosorption process and the mechanism of uranium biomineralization by cells were investigated in the present study. A novel experimental phenomenon that uranium concentrations have negative correlation with pH values and positive correlation with phosphate concentrations in the supernatant was observed, indicating that hydrogen ions, phosphate ions and uranyl ions were involved in the chernikovite precipitation actively. During the biosorption process, live cells desorb deposited uranium within the equilibrium state of biosorption system was reached and the phosphorus concentration increased gradually in the supernatant. These metabolic detoxification behaviours could significantly alleviate uranium toxicity and protect the survival of the cells better in the environment. The results of microscopic and spectroscopic analysis demonstrated that the precipitate on the cell surface was a type of uranium-phosphate compound in the form of a scale-like substance, and S. cerevisiae could transform the uranium precipitate into crystalline state-tetragonal chernikovite [H2(UO2)2(PO4)2·8H2O].
journal_name
Chemospherejournal_title
Chemosphereauthors
Zheng XY,Wang XY,Shen YH,Lu X,Wang TSdoi
10.1016/j.chemosphere.2017.02.035subject
Has Abstractpub_date
2017-05-01 00:00:00pages
161-169eissn
0045-6535issn
1879-1298pii
S0045-6535(17)30213-8journal_volume
175pub_type
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