Microbially Induced Precipitation of Strontianite Nanoparticles
- Authors
- Kang, Serku; Kim, Yumi; Lee, Young Jae; Roh, Yul
- Issue Date
- 7월-2015
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Strontium; Proteus Mirabilis; Biominealization; Strontianite; Bioremediation
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.15, no.7, pp.5362 - 5365
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 15
- Number
- 7
- Start Page
- 5362
- End Page
- 5365
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93178
- DOI
- 10.1166/jnn.2015.10413
- ISSN
- 1533-4880
- Abstract
- The objectives of this study were to investigate the microbially mediated precipitation of strontium by microorganisms, and to examine the mineralogical characteristics of the precipitates. Wu Do-1 (Proteus mirabilis) enriched from rhodoliths was used to precipitate strontium at room temperature under aerobic environment. The growth of Wu Do-1 gradually increased over 16 days (OD-600 = 2.6) and then decreased until 22 days (OD600 = 2.0) during microbial incubation for strontium precipitation. Also, the pH decreased from 6.5 to 5.3 over 4 days of incubation due to microbial oxidation of organic acids, and then the pH increased up to 8.6 at 25 days of incubation due to NH3+ generation. The Sr2+ concentration in the biotic group sharply decreased from 2,953 mg/L to 5.7 mg/L over 29 days of incubation. XRD, SEM-/TEM-EDS analyses revealed that the precipitates formed by Wu Do-1 (Proteus mirabilis) were identified as 20 similar to 70 nm sized strontianite (SrCO3). Therefore, these results suggested that formation of sparingly soluble Sr precipitates mediated by Wu Do-1 (Proteus mirabilis) sequesters strontium and carbon dioxide into a more stable and less toxic form such as strontianite (SrCO3). These results also suggest that bioremediation of metal-contaminated water and biominealization of carbonate minerals may be feasible in the marine environment.
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