Extracellular polymeric substance from Rahnella sp. LRP3 converts available Cu into Cu5(PO4)2(OH)4 in soil through biomineralization process. (May 2020)

• Record Type: Journal Article
• Authors: Do, Hoaithuong; Che, Chi; Zhao, Zijun; Wang, Yuqi; Li, Mingtang; Zhang, Xiufang; Zhao, Xingmin
• Is Part Of: Environmental pollution. Volume 260(2020)
• Publication Date: 2020-05
• Subjects: Extracellular polymeric substance (EPS) -- Remediation -- Biomineralization -- Copper -- Rahnella sp. LRP3; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.114051
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: 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 μm. Besides, EPS could induce the formation of Cu5 (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 °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. Graphical abstract: Image 10475 Highlights: The EPS extracted from Rahnella sp. LRP3 could remove Cu (II) in the solution through biosorption process. The EPS further induced the formation of Cu-containing biomineral, identified as Cu5 (PO4 )2 (OH)4 . The EPS decreased the content of available Cu in polluted soil via biomineralization process.