Journal
ENVIRONMENTAL POLLUTION
Volume 260, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.114051
Keywords
Extracellular polymeric substance (EPS); Remediation; Biomineralization; Copper; Rahnella sp. LRP3
Categories
Funding
- Natural Science Foundation of Jilin Province [20180101084JC]
- National Science Foundation of China [41877136]
- National Key Research and Development Program of China [2017YFD0801104]
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Soil contamination by toxic heavy metals such as copper is a serious problem. In this study, the extracellular polymeric substance (EPS) extracted from Rahnella sp. LRP3 was found with the potential of immobilizing Cu-polluted in soil. The EPS could bond to Cu (II) through functional groups (polysaccharides, amide, proteins, and carboxyl groups), which further developed into the porous sphere with a diameter of 20 mu m. Besides, EPS could induce the formation of Cu-5(PO4)(2)(OH)(4) crystal by the biomineralization process. Finally, the EPS in the culture solution reduced 89.4 mg/kg of DTPA-Cu content by 78.99% in soil for 10 d under the condition of 25 degrees C via biomineralization. The results demonstrated that EPS produced by Rahnella sp. LRP3 will be a promising factor in the remediation of Cu contaminated soil. (C) 2020 Elsevier Ltd. All rights reserved.
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