Phosphate promotes uranium (VI) adsorption in Staphylococcus aureus LZ-01

Area of Science:

• Environmental Microbiology
• Bioremediation
• Toxicology

Background:

• The bacterium Staphylococcus aureus LZ-01, isolated from the Yellow River, demonstrates resistance to chromium (VI).
• Investigating its potential for remediating environments contaminated with heavy metals and nuclear waste is crucial.

Purpose of the Study:

• To evaluate the uranium (VI) resistance and adsorption capabilities of Staphylococcus aureus LZ-01.
• To determine the effect of phosphate on uranium adsorption by strain LZ-01.
• To assess the potential of strain LZ-01 for nuclear waste remediation.

Main Methods:

• Bacterial culture and exposure to uranium (VI).
• Uranium adsorption efficiency measurements.
• Transmission electron microscopy (TEM) for visualizing cell surface changes.
• Energy dispersive X-ray spectroscopy (EDX) for elemental analysis of precipitates.

Main Results:

• Strain LZ-01 exhibits resistance to 2 mmol/l U(VI) and adsorbs 96% of U(VI) within 6 hours.
• TEM and EDX analysis revealed uranium-phosphorus precipitates on bacterial cell surfaces.
• Phosphate significantly enhanced U(VI) adsorption, with 45% adsorbed in 30 minutes in the presence of 20 mmol/l phosphate.

Conclusions:

• Staphylococcus aureus LZ-01 demonstrates robust U(VI) resistance and adsorption capabilities.
• Phosphate is a key factor in promoting U(VI) adsorption by strain LZ-01.
• This bacterial strain shows significant potential for nuclear waste remediation, particularly when supplemented with phosphate.