Evaluation of Europium Biosorption Using Deinococcus radiodurans

• Published in: Environmental processes 2021-03, Vol.8 (1), p.251-265
• Main Authors: Jena, Ananya, Pradhan, Sanghamitra, Mishra, Sujata, Sahoo, Naresh Kumar
• Format: Article
• Language: English
• Subjects: Aquatic environment; Biosorption; Cell culture; Cell walls; Culture media; Cystine; Deinococcus radiodurans; Earth and Environmental Science; Earth Sciences; Environmental Management; Environmental Science and Engineering; Europium; Functional groups; Inoculum; Microorganisms; Original Article; pH effects; Radioactivity; Sodium chloride; Waste Management/Waste Technology; Water Quality/Water Pollution; Yeasts
• ISSN: 2198-7491; 2198-7505
• DOI: 10.1007/s40710-020-00479-8

The efficacy of a biosorption-based approach using living cells of Deinococcus radiodurans for recovery of Eu 3+ from aquatic systems has been investigated . The effects of four variables including pH, culture media constituents, inoculum age and initial Eu 3+ concentration were evaluated. Among five different media compositions tested, the combination of tryptone, glucose, yeast extract (TGY), cystine and NaCl showed highest removal of Eu 3+ by the Deinococcus species. Similarly, maximum biosorption of Eu 3+ was achieved at pH 6. Further, at the optimized condition of pH 6 and inoculum age of 45 h with TGY + cystine+NaCl culture media, 81% of Eu +3 was removed within 3 h at an initial Eu +3 concentration of 150 mg L −1 . The appearance of EuPO 4 peak in the XRD analysis of the D. radiodurans culture further indicated that biosorption of Eu 3+ occurred onto the PO 4 functional group of the microbial cell wall. The high Eu +3 biosorption efficiency by D. radiodurans may constitute an effective and eco-friendly alternative strategy to recover Eu +3 from contaminated environment. Highlights • First report on Eu +3 biosorption by Deinococcus radiodurans. • Almost 80% Eu +3 biosorption occurs even at high initial concentration of 150 mg L −1 . • PO 4 functional group present on the cell plays a vital role on Eu 3+ biosorption.