Citation: | JIANG Mingyu, CAO Wenrui, SAREN Gaowa, CHANG Fengming. Study on the enrichment and mineralization of rare earth element cerium by marine bacteria[J]. Marine Geology & Quaternary Geology, 2023, 43(5): 190-197. doi: 10.16562/j.cnki.0256-1492.2023081801 |
Using Marine microorganisms isolated and cultured from deep-sea sediment samples, the accumulation and mineralization of rare earth element Ce by several marine bacteria (Jeotgalibacillus sp., Paenisporosarcina sp., Sulfitobacter sp.) were simulated. The interaction between marine bacteria and Ce was analyzed by inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscope (SEM), transmission electron microscopy (TEM), and other analytical methods. It was found that the three bacteria species could adsorb and enrich Ce, and the efficiencies of the adsorption and enrichment by the marine bacteria were mainly related to the bacteria density and the Ce concentration. In addition, the adsorption capacity of different marine bacterium to Ce was different. In the process of adsorption, enrichment, and mineralization of rare earth Ce by marine bacteria, rare earth Ce was first adsorbed at the cell surface to form nucleation cores, and then mineralized to form amorphous-structured mineral particles containing Ce on the cell surface. At last, the process and mechanism of rare earth mineralization enriched by marine microorganisms were further discussed.
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Map of sediment sampling stations
Morphology of marine bacteria
Curves of time-dependent adsorption of Ce by different marine bacteria
Variation of P concentration with time during the reaction
The change of pH during the reaction
Process of short-term adsorption of Ce by Jeotgalibacillus sp. CW126-A03
Process of long-term adsorption of Ce by Jeotgalibacillus sp. CW126-A03
SEM image of Jeotgalibacillus sp. CW126-A03 enriched in Ce
TEM image of Jeotgalibacillus sp. CW126-A03 and Sulfitobacter sp. CW126-B11 enriched in Ce
TEM-EDS image of Sulfitobacter sp. CW126-B11 enriched in Ce