Bioimmobilization of lead by Bacillus subtilis X3 biomass isolated from lead mine soil under promotion of multiple adsorption mechanisms.

ABSTRACT: In this study, a lead-resistant bacterium, Bacillus subtilis X3, was used to prepare a lead bioadsorbent for immobilization and removal of lead in lead solution. The lead shot precipitate was analysed by scanning electron microscopy combined with energy dispersive X-ray fluorescence microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The adsorbed lead was mainly mineralized to form Pb₅(PO₄)₃OH, Pb₁₀(PO₄)₆(OH)₂ and Pb₅(PO₄)₃Cl; however, other mechanisms that can also promote the mineralization of lead should not be ignored. For example, Na⁺ and Ca²⁺ on the cell wall surface were exchanged with Pb

SUBMITTER: Qiao W 

PROVIDER: S-EPMC6408372 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature