Microbially induced precipitation of strontianite nanoparticles

Serku Kang, Yumi Kim, Young Jae Lee, Yul Roh

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 (OD600 = 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 NH+ 3 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∼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.

Original languageEnglish
Pages (from-to)5362-5365
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume15
Issue number7
DOIs
Publication statusPublished - 2015 Jul 1

Keywords

  • Biominealization
  • Bioremediation
  • Proteus mirabilis
  • Strontianite
  • Strontium

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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